Experimental Seismic Performance Evaluation of Unreinforced Brick Masonry Buildings

Shahzada, Khan; Khan, Akhtar Naeem; Elnashai, Amr S.; Ashraf, Mohammad; Javed, Muhammad Faisal; Naseer, Amjad; Alam, Bashir

doi:10.1193/1.4000073

Cited by 49 publications

(27 citation statements)

References 6 publications

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“…In this context, the results of the room model presented in this study are compared to sour (4) other studies. Comparison is made to those of Shahzada et al [15], who studied a similar building configuration, which, however, was made of unconfined and unreinforced brick masonry. Similarly, for the same retrofitted building, the results are compared to those of Ashraf [16], who studied the retrofitting of the same unconfined brick masonry building.…”

Section: Force-deformation Behaviormentioning

confidence: 95%

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Seismic Capacity Assessment of Confined Brick Masonry Building: An Experimental Approach

Ahmed

Ahmad

Shahzada

et al. 2018

Shock and Vibration

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Brick masonry is widely used for building construction throughout the world. However, unreinforced brick masonry buildings performed poorly in the 2005 Kashmir earthquake, in Pakistan, resulting in a decline in the use of brick masonry. In order to investigate and quantify the performance of brick masonry against the seismic forces by confining it through typical stiffer, line elements (column and beams), a full-scaled room model of an area 3048 × 3658 mm (10 × 12 ft) and height of 3353 mm (11 ft) was constructed using confined brick masonry. The model was tested under quasistatic loading system. Crack pattern was noted at the end of each loading cycle. The response of the model was interpreted through a hysteresis curve, which was then idealized by a bilinear curve. A comparison of the results has been made with four different studies done on the similar model made of unreinforced brick masonry before and after retrofitting and unreinforced concrete block masonry before and after retrofitting previously tested at the same testing facility.

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Section: Force-deformation Behaviormentioning

confidence: 95%

“…Unreinforced brick masonry [15] URCBM before retrofitting [17] Unreinforced brick masonry after retrofitting [16] URCBM after retrofitting [17] Confined brick masonry concrete block masonry rather than brick masonry. Table 3 compares the stiffness, strength, and ultimate drift obtained of these four (4) studies with ours.…”

Section: Force Deformation Parametersmentioning

confidence: 99%

Seismic Capacity Assessment of Confined Brick Masonry Building: An Experimental Approach

Ahmed

Ahmad

Shahzada

et al. 2018

Shock and Vibration

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“…In addition, laboratory tests on small building models (Magenes et al 1995;Magenes and Calvi 1997;Yi 2004;Shahzada et al 2012) were conducted to better understand the stiffness, strength, deformability and damage patterns of sub-assemblages, which are valuable for developing and calibrating numerical models for seismic assessment. Recent studies have focused on key factors such as behavior of spandrel beams, flange effects in walls or out-of-plane behavior of walls, which contribute to more refined seismic performance assessment procedures (Russell et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Lateral load testing of an existing two story masonry building up to near collapse

Aldemir

Binici

Canbay

et al. 2015

Bull Earthquake Eng

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Laboratory testing, although necessary to understand failure mechanisms of individual masonry walls, spandrels or small scale building models, cannot fully mimic the real system behavior of masonry structures. In order to observe the performance of an existing two story masonry structure, cyclic lateral load testing up to near collapse was conducted. The test building was sliced approximately in the middle through the reinforced concrete slabs of both stories and one side was strengthened with the objective of obtaining a strong reaction wall. The other side of the structure was taken as the test structure with a floor plan of approximately 10 m 9 10 m. Hydraulic actuators attached at the slabs of both stories were employed to impose one way cyclic displacement excursions. Flexural and shear deformations on a number of walls were measured and crack propagations were monitored. The structure was tested up to a lateral strength drop of approximately 20 % from the ultimate load, which occurred at a drift ratio of about 0.60 %. The failure of the walls in the building, which were mostly failed in a diagonal tension mode, was concentrated on the first story. Results of this valuable test provide important data on the performance of an actual masonry building and were employed to assess the applicability of various stiffness and strength and simplified load-deformation models in the literature.

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“…The results show strength values depending on the mechanical properties of materials, as well as on the bond between blocks and mortar. For example, Shahzada et al (2012) have tested solid brick masonry wallettes in diagonal compression. The shear strength under zero normal stress was very low (the Authors do not even mention its value).…”

Section: Masonry Elements Subjected To In-plane Shearmentioning

confidence: 99%

Testing Historic Masonry Elements and/or Building Models

Vintzileou

2014

Geotechnical, Geological and Earthquake Engineering

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This paper provides an overview of the Literature on the behaviour of historic masonry elements and building models. The purpose of this paper is to identify the main parameters affecting the seismic behaviour of historic masonry buildings, as illustrated through the experimental campaigns carried out by numerous researchers. Furthermore, aspects of the seismic behaviour that are not sufficiently studied to-date are identified. Thus, selected publications are evaluated related to the behaviour of historic masonry elements in compression, in diagonal compression, in in-plane shear and simultaneous compression, out-of-plane bending, as well as publications related to the behaviour of subassemblies and building models subjected to monotonic, pseudo-dynamic or dynamic tests on earthquake simulator. The available experimental results illustrate the main weaknesses of historic masonry elements and bearing systems, namely the vulnerability to in-plane shear and to out-of-plane bending, the limited ductility, the negative effect of the flexibility of timber floors and roofs, etc. On the other hand, the beneficial effect of adequate connection between horizontal and vertical elements, as well as the connection among walls is also evident. Moreover, the variety of the construction types of masonry tested by various researchers, the scale of the models, the variety of experimental setups and loading histories do not allow, in most cases, a direct comparison of the experimental results. This is so especially as far as properties related to the deformations of masonry elements are concerned. Thus, the effort to develop sound physical models and to calibrate them is not yet satisfactorily assisted by the available experimental results. Yet, this is a prerequisite for a reliable assessment of the current state of historic structures and, by way of consequence, for the selection of adequate intervention techniques for their preservation.

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Experimental Seismic Performance Evaluation of Unreinforced Brick Masonry Buildings

Cited by 49 publications

References 6 publications

Seismic Capacity Assessment of Confined Brick Masonry Building: An Experimental Approach

Seismic Capacity Assessment of Confined Brick Masonry Building: An Experimental Approach

Lateral load testing of an existing two story masonry building up to near collapse

Testing Historic Masonry Elements and/or Building Models

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