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A COMPARATIVE STUDY OF BRICK MASONRY HOUSE MODEL UNDER QUASI-STATIC AND DYNAMIC LOADING

Pankaj Agarwal and S.K. Thakkar

Paper No.: 414

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Vol.: 38

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No.: 2-4

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December, 2001

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pp. 103-122

Abstract

 

Quasi-static tests on structural models have often been conducted with the objective to study hysteresis behaviour of the structure under prescribed loading and to determine the capacity of the structure such as maximum resistance and ductility. It has not yet been established how the results of these tests may be compared with dynamic test results. In this paper, a comparative study of behaviour of two half-scaled brick masonry house models have been made which are constructed with similar earthquake resistance features. Two types of tests are conducted on the models: shock table test and quasi-static test (QST). The shock table test consists of applying an impact type of loading in a shock table facility that produces nearly a half-sine pulse type of motion at the base of the platform carrying the model. The quasi-static test consists in applying a cyclic load at roof level at a very low frequency. The criterion for comparison of both the tests is the maximum absolute displacement at the roof level. The shock table model responds with a significant higher initial strength and stiffness as compared to the quasi-static model. The severity of damage is greater in quasi-static test due to increased crack propagation, thus proving conservatism of quasi-static test.
Keywords: Shock Table Test, Quasi-static Test, Brick Masonry, Hysteresis Behaviour

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