Sensitivity of Progressive Collapse of MRF to Redundancy Factor

Progressive collapse mainly refers to a chain failure in a structure. If one of the structural members gets a local collapse, it will lead to the other member's failure and eventually an additional collapse in the building. Over the past few decades, the assessment problems of the potential for progressive collapse, as well as improving the performance of structures against this type of failure, are widely discussed. In this study, the effects of redundancy factor on improving the performance of the structure with moment frame system against progressive failure are investigated. Also, the adequacy of the numerical value of the recommended redundancy factor of the design codes is worked out. In the selected models, the effects of redundancy are studied by increasing the number of spans and floors. Furthermore, the redundancy factor with both regular and irregular plans is modeled. The selected structures are studied with and without considering the redundancy factor, as well as by removing the columns which are more susceptible to progressive collapse. Finally, the results of the nonlinear static analysis of the models were obtained.