Applying Performance Based Plastic Design Method to Steel Moment Resisting Frame in Accordance with the Indian Standard Code

摘要

The current Indian Standard code uses the limit state procedure (which is a force based design) for design of steel structures to ensure a good earthquake resistant design which at times may fail in case of a severe earthquake as it is based on elastic analysis. The recently developed Performance based Plastic Design method is a displacement based method in which a predetermined failure pattern is used at certain points of a structure based on “strong column –weak beam concept”. An attempt has been made here to design a steel moment resisting frame using the Performance Based Plastic Design Method in accordance to the provisions of Indian Standard code IS 800: 2007. Plastic design is performed to detail the frame members as per IS 800: 2007 in order to achieve the intended yield mechanism and behavior. It is expected that a frame would perform better under seismic attack if it could be assured that plastic hinges would occur in beams rather than in columns, and if the shear strength of members exceeded the shear corresponding to flexural strength. This method also ensures possible inexpensive repairs even after damage.