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为研究考虑楼板作用的钢框架抗连续倒塌动力性能,运用结构动力学原理对简化力学模型进行理论分析,研究支撑柱失效时间与结构动力响应的关系,基于SAP 2000平台对考虑和不考虑组合楼板的钢框架有限元模型进行弹塑性动力反应分析,研究柱不同失效时间对失效点位移、振动频率等方面的影响。通过提出组合楼板薄膜效应对结构抗力提高系数ψ,量化组合楼板在连续倒塌过程中所起作用。结果表明:剩余结构动力响应随着柱不同的失效时间而变化,当失效时间为竖向自振周期的10%时,动力效应最大;组合楼板的存在能大大降低结构的最大动力响应,明显减小失效点位移,通过拉力薄膜效应可提高结构抗力至原来的1.6倍左右。
In order to study the anti-continuous collapse performance of steel frame considering the effect of floor, the simplified mechanics model is analyzed by the theory of structural dynamics, and the relationship between the failure time and the dynamic response of the structure is studied. Based on SAP2000 platform, The finite element model of steel frame was used to conduct elasto-plastic dynamic response analysis to study the influence of different failure time of column on the displacement and vibration frequency of failure point. By proposing the effect of composite slab film on structural resistance increase ψ, the quantitative composite slab plays a role in the continuous collapse process. The results show that the dynamic response of the remaining structure changes with the different failure time of the column. When the failure time is 10% of the vertical natural vibration period, the dynamic effect is the greatest. The presence of composite slabs can greatly reduce the maximum dynamic response of the structure, Small failure point displacement, through the tensile film effect can improve the structural resistance to about 1.6 times the original.