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Larsson, J., Johansson, F., Ivars, D., Johnson, E., Flansbjer, M. & Williams Portal, N. (2023). A novel method for geometric quality assurance of rock joint replicas in direct shear testing – Part 1: Derivation of quality assurance parameters and geometric reproducibility. Journal of Rock Mechanics and Geotechnical Engineering
Öppna denna publikation i ny flik eller fönster >>A novel method for geometric quality assurance of rock joint replicas in direct shear testing – Part 1: Derivation of quality assurance parameters and geometric reproducibility
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2023 (Engelska)Ingår i: Journal of Rock Mechanics and Geotechnical Engineering, ISSN 1674-7755Artikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

Since each rock joint is unique by nature, the utilization of replicas in direct shear testing is required to carry out experimental parameter studies. However, information about the ability of the replicas to simulate the shear mechanical behavior of the rock joint and their dispersion in direct shear testing is lacking. With the aim to facilitate generation of high-quality direct shear test data from replicas, a novel component in the testing procedure is introduced by presenting two parameters for geometric quality assurance. The parameters are derived from surface comparisons of three-dimensional (3D) scanning data of the rock joint and its replicas. The first parameter, σmf, captures morphological deviations between the replica and the rock joint surfaces. σmf is derived as the standard deviation of the deviations between the coordinate points of the replica and the rock joint. Four sources of errors introduced in the replica manufacturing process employed in this study could be identified. These errors could be minimized, yielding replicas with σmf ≤ 0.06 mm. The second parameter is a vector, VHp100, which describes deviations with respect to the shear direction. It is the projection of the 100 mm long normal vector of the best-fit plane of the replica joint surface to the corresponding plane of the rock joint. |VHp100| was found to be less than or equal to 0.36 mm in this study. Application of these two geometric quality assurance parameters demonstrates that it is possible to manufacture replicas with high geometric similarity to the rock joint. In a subsequent paper (part 2), σmf and VHp100 are incorporated in a novel quality assurance method, in which the parameters shall be evaluated prior to direct shear testing. Replicas having parameter values below established thresholds shall have a known and narrow dispersion and imitate the shear mechanical behavior of the rock joint.

Ort, förlag, år, upplaga, sidor
Chinese Academy of Sciences, 2023
Nyckelord
Geometric quality assurance, Geometric reproducibility, Replicas, Rock joint, Surface comparisons, Three-dimensional (3D) scanning
Nationell ämneskategori
Samhällsbyggnadsteknik
Identifikatorer
urn:nbn:se:ri:diva-63984 (URN)10.1016/j.jrmge.2022.12.011 (DOI)2-s2.0-85147379920 (Scopus ID)
Anmärkning

Correspondence Address: Larsson, J, RISE, Sweden; email: jorgen.larsson@ri.se; Funding details: BeFo 391; Funding details: Nuclear Waste Management Organization, NWMO; Funding text 1: The authors would like to acknowledge the financial contribution received from BeFo Rock Engineering Research Foundation (Grant proposal BeFo 391); Nuclear Waste Management Organization (NWMO) , Toronto, Canada and Swedish Nuclear Fuel and Waste Management Co. ( SKB ), Solna, Sweden. The authors also would like to acknowledge Jörgen Spetz at the Department of Measurement Technology at Research Institutes of Sweden (RISE) for performing the scanning.

Tillgänglig från: 2023-02-16 Skapad: 2023-02-16 Senast uppdaterad: 2023-07-06Bibliografiskt granskad
Larsson, J., Johansson, F., Ivars, D. M., Johnson, E., Flansbjer, M. & Williams Portal, N. (2023). A novel method for geometric quality assurance of rock joint replicas in direct shear testing : Part 2: Validation and mechanical replicability. Journal of Rock Mechanics and Geotechnical Engineering
Öppna denna publikation i ny flik eller fönster >>A novel method for geometric quality assurance of rock joint replicas in direct shear testing : Part 2: Validation and mechanical replicability
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2023 (Engelska)Ingår i: Journal of Rock Mechanics and Geotechnical Engineering, ISSN 1674-7755Artikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

Each rock joint is unique by nature which means that utilization of replicas in direct shear tests is required in experimental parameter studies. However, a method to acquire knowledge about the ability of the replicas to imitate the shear mechanical behavior of the rock joint and their dispersion in direct shear testing is lacking. In this study, a novel method is presented for geometric quality assurance of replicas. The aim is to facilitate generation of high-quality direct shear testing data as a prerequisite for reliable subsequent analyses of the results. In Part 1 of this study, two quality assurance parameters, σmf and VHp100, are derived and their usefulness for evaluation of geometric deviations, i.e. geometric reproducibility, is shown. In Part 2, the parameters are validated by showing a correlation between the parameters and the shear mechanical behavior, which qualifies the parameters for usage in the quality assurance method. Unique results from direct shear tests presenting comparisons between replicas and the rock joint show that replicas fulfilling proposed threshold values of σmf < 0.06 mm and < 0.2 mm have a narrow dispersion and imitate the shear mechanical behavior of the rock joint in all aspects apart from having a slightly lower peak shear strength. The wear in these replicas, which have similar morphology as the rock joint, is in the same areas as in the rock joint. The wear is slightly larger in the rock joint and therefore the discrepancy in peak shear strength derives from differences in material properties, possibly from differences in toughness. It is shown by application of the suggested method that the quality assured replicas manufactured following the process employed in this study phenomenologically capture the shear strength characteristics, which makes them useful in parameter studies.

Nyckelord
Three-dimensional (3D) scanning, Contact area measurements, Direct shear testing, Geometric quality assurance, Mechanical replicability, Replicas, Rock joint
Nationell ämneskategori
Samhällsbyggnadsteknik
Identifikatorer
urn:nbn:se:ri:diva-64280 (URN)10.1016/j.jrmge.2022.12.012 (DOI)
Anmärkning

The authors would like to acknowledge the financial contribution received from BeFo Rock Engineering Research Foundation (Grant proposal BeFo 391); Nuclear Waste Management Organization (NWMO), Toronto, Canada and Swedish Nuclear Fuel and Waste Management Co. (SKB), Solna, Sweden. 

Tillgänglig från: 2023-03-30 Skapad: 2023-03-30 Senast uppdaterad: 2023-07-03Bibliografiskt granskad
Jacobsson, L., Flansbjer, M. & Larsson, J. (2023). Direct shear tests on large natural and artificially induced rock fractures in a new laboratory equipment. In: Schubert, W. & Kluckner, A. (Ed.), Proceedings of the ISRM 15th International Congress on Rock Mechanics and Rock Engineering & 72nd Geomechanics Colloquium: Challenges in Rock Mechanics and Rock Engineering. Paper presented at ISRM 15th International Congress on Rock Mechanics and Rock Engineering & 72nd Geomechanics Colloquium, Salzburg, Austria, October 9-14, 2023 (pp. 2709-2714). Salzburg: Austrian Society for Geomechanics, Article ID 1827.
Öppna denna publikation i ny flik eller fönster >>Direct shear tests on large natural and artificially induced rock fractures in a new laboratory equipment
2023 (Engelska)Ingår i: Proceedings of the ISRM 15th International Congress on Rock Mechanics and Rock Engineering & 72nd Geomechanics Colloquium: Challenges in Rock Mechanics and Rock Engineering / [ed] Schubert, W. & Kluckner, A., Salzburg: Austrian Society for Geomechanics , 2023, s. 2709-2714, artikel-id 1827Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

A direct shear equipment for testing rock fractures up to 400×600 mm size, and up to 5 MN force in both normal and shear loading directions, was developed. Normal loading and direct shear tests under constant normal stiffness (CNS) and constant normal load (CNL) conditions were conducted on 300×500 mm specimens, one planar steel joint and two natural and two tensile induced rock fractures. Design targets, e.g. system to maintain undisturbed fractures up to testing and high system stiffnesses to achieve well-controlled shear tests, were verified by the experiments. A new optical system for local deformation measurements was used to accurately determine fracture displacements besides conventional non-local deformation measurements. The determined normal stiffnesses were similar previous results from the literature on smaller fractures, whereas the shear stiffness data are novel. The results provide a new insight into processes at the onset of fracture slip.

Ort, förlag, år, upplaga, sidor
Salzburg: Austrian Society for Geomechanics, 2023
Nyckelord
Rock fractures, large scale direct shear equipment, local optical deformation measurements, CNL, CNS, fracture stiffness
Nationell ämneskategori
Geoteknik
Identifikatorer
urn:nbn:se:ri:diva-67541 (URN)
Konferens
ISRM 15th International Congress on Rock Mechanics and Rock Engineering & 72nd Geomechanics Colloquium, Salzburg, Austria, October 9-14, 2023
Forskningsfinansiär
Svensk Kärnbränslehantering, SKB
Anmärkning

Funding of this work: SKB Svensk Kärnbränslehantering,  

NWMO Nuclear Waste Management Co https://www.nwmo.ca/ , 

BeFo Stiftelsen Bergteknisk Forskning https://www.befoonline.org/

Tillgänglig från: 2023-10-17 Skapad: 2023-10-17 Senast uppdaterad: 2023-10-17Bibliografiskt granskad
Godio, M., Flansbjer, M. & Williams Portal, N. (2023). Low-velocity out-of-plane impact tests on double-wythe unreinforced brick masonry walls instrumented with optical measurements. International Journal of Impact Engineering
Öppna denna publikation i ny flik eller fönster >>Low-velocity out-of-plane impact tests on double-wythe unreinforced brick masonry walls instrumented with optical measurements
2023 (Engelska)Ingår i: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509Artikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

Unreinforced brick masonry makes up today a significant piece of the European built environment, including not only residential buildings but also strategically important structures that are not designed to withstand blasts and impacts. Yet, it is difficult to accurately estimate the response of these structures and the extent of damage they sustain during such extreme loading conditions. This paper presents the implementation and discusses the results of laboratory impact tests conducted on natural-scale double-wythe unreinforced brick masonry walls, a typology that is frequently found in Northern Europe. The walls were spanning vertically between two reinforced concrete slabs and were subjected to low-velocity drop-weight pendulum tests in which they were repeatedly hit until the opening of a breach in the center of the wall. The tests were instrumented with both hard-wired and optical measurements, the latter consisting of high-speed cameras and digital image correlation techniques, to face the difficulty of observing cracks and determining the deflections of the walls with adequate accuracy at the time of the impact. Investigated in these tests were the out-of-plane response of the walls and their capacity to resist the impacts. The axial load applied on the top of the walls was varied for two wall configurations and monitored throughout the tests to study the effect of arching on the failure mechanism produced and number of repeated hits needed to open the breach. Of interest was also the evidence of cracking, more specifically the way it initiated on the undamaged walls and next propagated upon consecutive hits. The data generated from these tests are made available to support further investigations on unreinforced masonry structures subjected to extreme actions.

Nyckelord
Impacts, Masonry, Out-of-plane, Arching, Digital Image Correlation (DIC), High-speed cameras
Nationell ämneskategori
Infrastrukturteknik
Identifikatorer
urn:nbn:se:ri:diva-64282 (URN)10.1016/j.ijimpeng.2023.104597 (DOI)
Anmärkning

This study was funded by the ÅForsk Foundation, through the ‘Young researcher’ granting scheme, grant agreement n. 20-335.

Tillgänglig från: 2023-04-06 Skapad: 2023-04-06 Senast uppdaterad: 2023-05-26Bibliografiskt granskad
Godio, M., Flansbjer, M. & Williams Portal, N. (2023). Low-velocity out-of-plane impact tests on double-wythe unreinforced brick masonry walls instrumented with optical measurements. International Journal of Impact Engineering, 178, Article ID 104597.
Öppna denna publikation i ny flik eller fönster >>Low-velocity out-of-plane impact tests on double-wythe unreinforced brick masonry walls instrumented with optical measurements
2023 (Engelska)Ingår i: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 178, artikel-id 104597Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Unreinforced brick masonry makes up today a significant piece of the European built environment, including not only residential buildings but also strategically important structures that are not designed to withstand blasts and impacts. Yet, it is difficult to accurately estimate the response of these structures and the extent of damage they sustain during such extreme loading conditions. This paper presents the implementation and discusses the results of laboratory impact tests conducted on natural-scale double-wythe unreinforced brick masonry walls, a typology that is frequently found in Northern Europe. The walls were spanning vertically between two reinforced concrete slabs and were subjected to low-velocity drop-weight pendulum tests in which they were repeatedly hit until the opening of a breach in the centre of the wall. The tests were instrumented with both hard-wired and optical measurements, the latter consisting of high-speed cameras and digital image correlation techniques, to face the difficulty of observing cracks and determining the deflections of the walls with adequate accuracy at the time of the impact. Investigated in these tests were the out-of-plane response of the walls and their capacity to resist the impacts. The axial load applied on the top of the walls was varied for two wall configurations and monitored throughout the tests to study the effect of arching on the failure mechanism produced and number of repeated hits needed to open the breach. Of interest was also the evidence of cracking, more specifically the way it initiated on the undamaged walls and next propagated upon consecutive hits. The data generated from these tests are made available to support further investigations on masonry structures subjected to extreme actions.

Nyckelord
Impacts, Masonry, Out-of-plane, Arching, Digital image correlation (DIC), High-speed cameras
Nationell ämneskategori
Infrastrukturteknik
Identifikatorer
urn:nbn:se:ri:diva-64373 (URN)10.1016/j.ijimpeng.2023.104597 (DOI)2-s2.0-85152227379& (Scopus ID)
Anmärkning

This study was funded by the ÅForsk Foundation, through the ‘Young researcher’ granting scheme, grant agreement n. 20-335.

Tillgänglig från: 2023-04-25 Skapad: 2023-04-25 Senast uppdaterad: 2023-05-26Bibliografiskt granskad
Amani, M., Al-Emrani, M. & Flansbjer, M. (2023). Shear behavior of stainless steel girders with corrugated webs. Journal of constructional steel research, 210, Article ID 108086.
Öppna denna publikation i ny flik eller fönster >>Shear behavior of stainless steel girders with corrugated webs
2023 (Engelska)Ingår i: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 210, artikel-id 108086Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this paper, the shear strength of corrugated web girders made of EN 1.4162/LDX 2101 stainless steel is investigated. Four full-scale trapezoidal corrugated web girders were tested under shear. Before conducting the tests, DIC was used to measure the real geometric imperfections in the web panels. Complementary finite element analysis studies were conducted to assess the sensitivity of the shear strength to initial imperfections. The experimental results indicated that all the tested girders with a local slenderness ratio of λ = 0.7 attained the shear yield strength, which was then followed by strain hardening in the material at a level that was 8–18% higher than the yield strength. This implies that the Eurocode's limit of λ = 0.25 to attain the plastic shear strength in corrugated webs can be quite conservative for stainless steel. According to the findings of the imperfection sensitivity studies, an initial geometric imperfection based on the first eigen buckling mode and with a maximum amplitude of amax/200, where amax is the maximum corrugation fold length, yielded ultimate strength within 3% of the test results. When the amplitude was increased to hw/200, where hw is the web height, the ultimate strength was estimated to be 25% lower on average than in the experiments. In three of the studied girders, initial imperfections with other forms than the first buckling mode were found to be more critical. Further, it was found that regardless of mode number, mode shapes that are more extended over the web panel result in a higher degradation of the ultimate shear strength. © 2023 The Authors

Ort, förlag, år, upplaga, sidor
Elsevier Ltd, 2023
Nyckelord
Corrugated web girders, Imperfection sensitivity, Shear strength, Stainless steel, Beams and girders, Buckling, Yield stress, Buckling mode, Corrugated web, Initial imperfection, Shear behaviour, Shears strength, Steel girder, Ultimate strength, Web panels, Strain hardening
Nationell ämneskategori
Husbyggnad
Identifikatorer
urn:nbn:se:ri:diva-65673 (URN)10.1016/j.jcsr.2023.108086 (DOI)2-s2.0-85163343852 (Scopus ID)
Anmärkning

Correspondence Address: M. Amani; Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg, SE-412 96, Sweden;  

The research work reported in this paper was conducted within the research project “Sunlight,” which was funded by the Swedish Innovation Agency , VINNOVA , and LIGHTer during the period 2019–2022. The Swedish Transport Administration (Trafikverket), the Swedish Institute of Steel Construction (SBI), SWERIM, COWI, WSP, ESAB, Stål och Rörmontage, and Outokumpu all made valuable contributions to the project. 

Tillgänglig från: 2023-08-10 Skapad: 2023-08-10 Senast uppdaterad: 2023-08-10Bibliografiskt granskad
Godio, M., Flansbjer, M. & Williams Portal, N. (2023). Single- and double-wythe brick masonry walls subjected to four-point bending tests under different support conditions: Simply supported, rigid, non-rigid. Construction and Building Materials, 404, Article ID 132544.
Öppna denna publikation i ny flik eller fönster >>Single- and double-wythe brick masonry walls subjected to four-point bending tests under different support conditions: Simply supported, rigid, non-rigid
2023 (Engelska)Ingår i: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 404, artikel-id 132544Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Out-of-plane actions cause confined unreinforced masonry walls (URM) to develop what is known as an arching action. The role of arching is central in the resisting mechanisms of a wall; it contributes significantly to its loadbearing capacity as long as the wall’s deflections are minor, but gradually loses effect with increasing deflections, until collapse occurs. To date, limited experimental data is available on how arching develops in relation to the out-of-plane behaviour of the wall. This study brings new experimental evidence to this aspect. Quasi-static monotonic four-point bending tests were conducted on eleven brick wall strips, with reinforced concrete (RC) slabs affixed below and over the walls to simulate contact conditions of a typical construction system. The walls were tested vis-à-vis three different support conditions: simply supported, rigid, and non-rigid. The influence of these support conditions on the out-of-plane behaviour of the walls was studied on specimens with varying thickness – single and double wythe – and subjected to different levels of axial compression (or overload). While the former support condition was designed not to yield any arching inside the wall (unconfined masonry), the intermediate and latter solutions generated an arching action that was proportional respectively to the elongation of the wall (partially confined masonry), and its deflection (confined masonry). The walls were tested inside a bi-axial test setup that allowed not only the out-of-plane force but also the arching action to be measured, corroborating its central role in the development of the out-of-plane capacity of the walls. To support the observations, deformation characteristics and crack distributions were determined using two optical measurement systems placed in front and to the side of the walls, making use of the Digital Image Correlation (DIC) technique. The results of the tests are discussed in terms of failure mechanism as well as force and displacement capacity of the walls in relation to the investigated parameters. The test data is collected and made available to help with future research on the out-of-plane capacity of URM walls.

Nyckelord
Unreinforced masonry (URM), Out-of-plane, Arching, Digital Image Correlation (DIC), Bending, Shear failure
Nationell ämneskategori
Husbyggnad
Identifikatorer
urn:nbn:se:ri:diva-66705 (URN)10.1016/j.conbuildmat.2023.132544 (DOI)
Anmärkning

This study was made possible with the support of RISE Research Institutes of Sweden (RISE) and Swedish Fortifications Agency (FORTV), working jointly in the Centre of excellence for fortifications (Centrum for fortifikatorisk kompetens, CFORT). 

Tillgänglig från: 2023-09-07 Skapad: 2023-09-07 Senast uppdaterad: 2023-09-07Bibliografiskt granskad
Amani, M., Al-Emrani, M. & Flansbjer, M. (2022). Shear Behavior of Stainless Steel Girders with Corrugated Webs. In: Proc. of Stainless Steel in Structures – Sixth International Experts Seminar: . Paper presented at Stainless Steel in Structures – Sixth International Experts Seminar. London, UK. 20-21 September 2022..
Öppna denna publikation i ny flik eller fönster >>Shear Behavior of Stainless Steel Girders with Corrugated Webs
2022 (Engelska)Ingår i: Proc. of Stainless Steel in Structures – Sixth International Experts Seminar, 2022Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This paper reports experimental and finite element investigations conducted to assess the shear strength of corrugated web girders in stainless steel. The steel under consideration is LDX 2101. Four trapezoidal corrugated web girders were tested under shear. All tested girders reached the shear yield strength followed by strain hardening. An imperfection sensitivity study was done with the aid of finite element modelling. It was observed that an initial geometric imperfection based on the first eigen buckling mode with a maximum amplitude of the minimum dimension of the critical corrugation sub panel divided by 200, 𝑎max200⁄, leads to an ultimate shear strength greater than the shear yield strength and close to the test findings. It is concluded that EN 1993-1-5 shear design model for corrugated webs is conservative for stainless steel girders tested in the current study.

Nyckelord
Corrugated web girders, Stainless steel, Shear Strength.
Nationell ämneskategori
Annan materialteknik
Identifikatorer
urn:nbn:se:ri:diva-60245 (URN)
Konferens
Stainless Steel in Structures – Sixth International Experts Seminar. London, UK. 20-21 September 2022.
Tillgänglig från: 2022-10-04 Skapad: 2022-10-04 Senast uppdaterad: 2023-05-25Bibliografiskt granskad
Godio, M., Williams Portal, N., Flansbjer, M., Magnusson, J. & Byggnevi, M. (2021). Experimental and numerical approaches to investigate the out-of-plane response of unreinforced masonry walls subjected to free far-field blasts. Engineering structures, 239, Article ID 112328.
Öppna denna publikation i ny flik eller fönster >>Experimental and numerical approaches to investigate the out-of-plane response of unreinforced masonry walls subjected to free far-field blasts
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2021 (Engelska)Ingår i: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 239, artikel-id 112328Artikel, forskningsöversikt (Refereegranskat) Published
Abstract [en]

Masonry walls are bulky and heavy and have therefore the potential to act naturally as a protective system to blasts. Yet, they are known to have a limited flexural and torsional capacity, particularly when unreinforced. When exposed to shockwaves, they experience out-of-plane failure mechanisms which may affect the overall stability of the building and engender flying debris inside the building. The out-of-plane response of unreinforced masonry walls to blasts depends on many factors characterizing both the wall and blast action, making any sort of prediction difficult. In this context, experimental tests and numerical models become key tools that can be used to study the wall’s response on a case-by-case basis. This review covers the major experimental and numerical approaches to assess the out-of-plane response of unreinforced masonry walls subjected to blasts. A methodological appraisal is used for the test methods, focusing on the preparation of the test items and test setup, the boundary conditions and failure mechanisms investigated, as well as the commonly employed measurement techniques. The survey on the modelling approaches includes key topics such as level of detail and cost, and reports strategies to model the wall and blast scenario. The review provides a thematic analysis of the available literature, aimed to assist the analyst in selecting a suitable tool for the investigation of masonry in the field of blast engineering. Furthermore, the findings presented herein can support amendments of existing codes and guidelines pertaining to the design of protective masonry structures.

Ort, förlag, år, upplaga, sidor
Elsevier, 2021
Nyckelord
Masonry, Blast, Out-of-plane actions, Testing, Modelling
Nationell ämneskategori
Husbyggnad
Identifikatorer
urn:nbn:se:ri:diva-52977 (URN)10.1016/j.engstruct.2021.112328 (DOI)
Anmärkning

The presented research was made possible with the support of RISE Research Institutes of Sweden and Swedish Fortifications Agency (FORTV), working jointly in the Centrum för fortifikatorisk kompetens (Centre of excellence for fortifications, CFORT).

Tillgänglig från: 2021-04-21 Skapad: 2021-04-21 Senast uppdaterad: 2023-05-26Bibliografiskt granskad
Williams Portal, N., Godio, M., Flansbjer, M., Byggnevi, M. & Magnusson, J. (2021). Quasi-static out-of-plane testing of unreinforced masonry walls instrumented with optical measurements. In: : . Paper presented at 14T H CANADIAN MASONRY SYMPOSIUM MO N T R E A L , C A N A D A MAY 16TH – MAY 20TH , 2021.
Öppna denna publikation i ny flik eller fönster >>Quasi-static out-of-plane testing of unreinforced masonry walls instrumented with optical measurements
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2021 (Engelska)Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Masonry buildings have existed in Sweden since the Middle Ages. The use of brick masonry as a construction material was pivotal until the beginning of the 20th century. Unreinforced masonry walls (URM) are massive and act as a protective system, yet they have limited capacity against explosions. When exposed to blasts, they experience out-of-plane failure, which engenders flying debris inside the building and may affect the stability of the building. Knowledge pertaining to the design and strengthening of URM walls against blasts has been identified as insufficient, on a Swedish context, to answer the current threats. In this paper, the results from quasi-static out-ofplane tests performed on URM walls made of clay bricks and lime-based mortar are presented. The tests were performed at RISE Research Institutes of Sweden by applying an incremental outof-plane displacement, while applying an axial load at the wall’s top edge. RC slabs were affixed over and below the walls to simulate the contact condition of a typical system. Two different types of support were tested for the upper slab: a) where the slab could slide along the vertical direction, and b) where this was prevented, leading to an arching action inside the wall. The results were generated as a part of an initial experimental stage of a project investigating URM walls loaded laterally by static and blast loads with optical measurements. Ultimately, the results will be used to verify existing models and/or develop a new model for the load-deformation relationship.

Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:ri:diva-56397 (URN)
Konferens
14T H CANADIAN MASONRY SYMPOSIUM MO N T R E A L , C A N A D A MAY 16TH – MAY 20TH , 2021
Tillgänglig från: 2021-09-09 Skapad: 2021-09-09 Senast uppdaterad: 2023-05-26Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-3481-1368

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