The paper presents a seismic safety assessment of unreinforced masonry(URM)building using two approaches.The first approach uses the'Pier Analysis'method,based on the concept of equivalent lateral stiffness,where in-plane and out-of-plane actions are considered independently.The second approach is developed with the program SAP2000,where the linear response is evaluated using continuum'finite element modelling'(FEM).Both methods are compared to evaluate the safety of wall piers and the differences in the outcomes under combined gravitational and lateral seismic forces.The analysis results showed that few wall elements are unsafe in in-plane and out-of-plane tension.It is also observed that the pier analysis method is conservative compared to FEM,but can be used as a simplified and quick tool in design offices for safety assessment,with reasonable accuracy.To safeguard the URM wall piers under lateral loads,a retrofitting technique is adopted by providing vertical and horizontal belts called splints and bandages,respectively,using welded wire mesh(WWM)reinforcement.The study using the'Pier Analysis'shows that the lateral load capacity of unsafe URM piers can be enhanced up to 3.67 times and made safe using the applied retrofitting technique.Further,the retrofitting design methodology and recommendations for application procedures to on-site URM buildings are discussed in detail.

Earthquake Engineering Research Center,International Institute of Information Technology Hyderabad(IIIT-H),Telangana 500032,India;Department of Earthquake Engineering,Indian Institute of Technology Roorkee(IITR),Uttarakhand 247667,India

[1]Pravin Kumar Venkat Rao PADALU;Yogendra SINGH-.Seismic safety evaluation methodology for masonry building and retrofitting using splint and bandage technique with wire mesh)[J].结构与土木工程前沿,2022(04):478-505

splint,Pier,splints,bandages

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