Seismic Analysis of Confined Masonry Shear Walls

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dc.contributor.advisor Brzev, Svetlana Rangwani, Kiran Prakash 2016-03-30T12:27:05Z 2016-03-30T12:27:05Z 2016
dc.identifier.citation Rangwani, Kiran Prakash (2016). Seismic Analysis of Confined Masonry Shear Walls (M. Tech. Dissertation). Indian Institute of Technology, Gandhinagar, pp. 168 (Acc No: T00102) en_US
dc.description.abstract Masonry is a widely acceptable traditional construction material due to simple construction practice, durability and economic advantages. However, vulnerability of masonry has been exposed in many seismic events due to its lacking capacity in tension. Poor seismic performance of Unreinforced Masonry (URM) has caused a widespread urge for improving the performance of masonry construction. Hence, the use of masonry with different reinforcement patterns has been practiced in many countries to enhance seismic performance of masonry buildings. Confined Masonry (CM) is a construction method where a URM panel is surrounded with RC confining elements. This system provides an alternative for URM construction which lacks ductility, and RC frames with masonry infills which has safety issues during earthquakes. CM construction has been widely used in Indonesia, Latin America, some European and Middle Eastern countries, and has been known for its very good performance in seismic events. Extensive studies have been undertaken in past decades that characterize structural and seismic performance of CM walls. However, there is no guideline or code related to analysis and design of CM buildings in India. Codes in some other countries rely upon force-based methodology to predict the behaviour of such systems, similar to codes for RC and steel design in India. Very few research studies have been performed related to seismic design of CM structures based on nonlinear analysis approach to estimate and control the seismic damage. In developing countries like India, application of CM construction technology is practised in some rural areas but specific technical guidance is not available. However, first application of engineered CM in India was recently completed at IITGn campus. Since this construction methodology is not widespread, Indian society is not aware about the structural benefits of such system. To enable wide application of CM on large scale in an earthquake-prone country like India, design recommendations are needed to be developed to educate engineers regarding this technology. This study is an attempt to contribute towards simulating the behaviour of CM walls under seismic loads through computer analyses using Wide Column Modelling Approach. Wide Column Model (WCM), also known as Equivalent Frame Model, is a macro modelling approach for wall structures which are idealized as a moment-resisting frame. WCM can be applied to confined masonry (CM) wall panels, which consist of masonry walls enclosed by reinforced concrete (RC) confining elements (tie-columns and tie-beams). CM walls can be modelled as “wide columns” with transformed section properties accounting for composite masonry and RC wall sections. Beams in these frames have rigid segments simulating the effect of wall stiffness, and other segments that simulate the effect of tie-beams and floor/roof slabs. WCM is able to model the composite action of masonry panels and the confining RC tie-columns, and has been established as a viable model for seismic analysis of CM buildings. This thesis presents the results of linear elastic analyses (LEA) of typical 3-storey CM walls using the WCM and a comparison with the Finite Element Method (FEM). The output parameters include shear forces, bending moments, stiffness, and lateral displacements (drift). LEA was also carried out to compare seismic response of CM wall system with URM walls and RC infilled frame systems. Moreover, applicability of WCM for modelling CM walls with openings was also studied. Subsequently, the Nonlinear Static (NS) (pushover) analysis method was used to simulate post-cracking behaviour of CM walls. Flexural and shear behaviour of these walls was obtained through the corresponding nonlinear hinge properties. The analyses were performed using the SAP2000 software package. Stiffness degradation during the nonlinear seismic response was used to determine stiffness modifiers which can be applied to linear WCMs to simulate displacement response in the post-cracking stage. The approach presented in this thesis is believed to be useful for design applications in India since it does not require significant computational effort and can be applied using a variety of software packages. en_US
dc.description.statementofresponsibility by Kiran Prakash Rangwani
dc.format.extent 168 p.; col.; ill; 31 cm. + 1 CD-ROM
dc.language.iso en_US en_US
dc.publisher Indian Institute of Technology Gandhinagar en_US
dc.subject Masonry Shear Walls en_US
dc.subject Seismic Analysis en_US
dc.subject Unreinforced Masonry en_US
dc.subject Confined Masonry en_US
dc.subject IITGn Campus en_US
dc.subject Wide Column Model en_US
dc.subject Equivalent Frame Model en_US
dc.subject Nonlinear Static en_US
dc.title Seismic Analysis of Confined Masonry Shear Walls en_US
dc.type Thesis en_US
dc.contributor.department Civil Engineering M.Tech.

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