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研究钢结构建筑连续倒塌对各设计参数的敏感度,包括:梁、柱和支撑的屈服强度,活荷载取值,弹性模型及阻尼比等。应用MonteCarlo模拟,Tornado表分析和一次二阶矩方法确定设计参数的不确定性。分析结果表明,在抗弯框架中,梁屈服强度在各设计参数中影响最大,而在双重系统建筑中,柱屈服强度在各设计参数中影响最大。强度不确定构件的竖向位移敏感度表明,抗弯框架和双重系统建筑的连续倒塌机构因为竖向荷载分布模式不同而完全不同。
The sensitivity of the continuous collapse of steel structure to various design parameters is studied, including yield strength, live load value, elastic model and damping ratio of beams, columns and supports. The Monte Carlo simulation, Tornado table analysis and first order second moment method are used to determine the uncertainty of design parameters. The analysis results show that the yield strength of the beam has the most influence on the design parameters in the bending frame, while the yield strength of the column has the greatest influence on the design parameters in the double system building. The vertical displacement sensitivity of members with undetermined strength shows that the continuous collapse mechanism of flexural frame and double system building is completely different due to the different vertical load distribution modes.