Methods of structural analysis for resistance to progressive collapse

Introduction. Calculation methods and current normative documents used in the calculation of buildings for resistance to progressive collapse are considered. The key analysis listed fundamenta.rules each them stated. advantages disadvantages these analyzed. Materials methods. calculations stability have been carried out a multi-span flat frame at failure middle post ground floor. software complex LIRA-SAPR 2021 R1.2 was perform calculations. task solved by several methods: static calculation, quasi-static dynamic calculation. nonlinear functioning construction material considered step-methods with using flow curve from SP 16.13330.2017. Quasistatic performed two variants: pulldown pushdown analysis. direct integration equations motion module “Dynamics Time”. Two variants different element elimination time were Results. results analyzed summarized Table 2. yields force displacement values that clearly underestimated as compared other Forces displacements obtained quasistatic greater than those analyses close value. Conclusions. give higher forces correlate better formulation. In order determine more accurately when justification dynamical coefficient is necessary.