Pushover Analysis of Steel Framed Building

In last few decades Steel structure has played an important role in Industry of Construction. It is necessary to design a structure so that it perform well under seismic loads. The seismic performance of a multi-story steel framed building is designed in accordance to the provisions of the Indian code (IS 800 -2007). The ductility of the structure can be increased by introducing Steel bracings in the structural system. Different type of bracings can be used for retrofitting as well. There are many different numbers of ways to arrange Steel bracings such as X-braced, diagonally braced, alternative diagonally braced, V-braced, inverted V-braced, Kbraced etc. In this study a typical multi-story (G+9) steel frame building is designed with and without different various types of bracings. Single Diagonal, X, V and Inverted V frames are the different types of bracings which will be considered for this study. Performance of each frame is studied through nonlinear static analysis (pushover analysis) using a software package SAP-2000. Deformed shapes, hinge results, lateral displacements, modal period and frequencies of the different Building frames and corresponding mode shapes are compared for frame with and without bracings. Pushover curves and performance points for the different frames with and without bracing systems are compared to find the relative performances of various frames considered.