concentrates on a computer based push-over analysis technique for performance-based design of steel building frame works subjected to earthquake loading. Through the use of a plasticity-factor that measures the degree of plasticisation, the standard elastic and geometric stiffness matrices for frame elements (beams, columns, etc.) are progressively modified to account for nonlinear elastic–plastic behaviour under constant gravity loads and incrementally increasing lateral loads. The analysis is performed for two steel frameworks of solid and hollow members. This investigation aims to analyse the difference in structural behaviour between hollow and solid frames. The technique adopted in this research is based on the conventional displacement method of elastic analysis
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