侧向冲击作用下钢管混凝土构件的简化分析模型

Simplified Analysis model of Circular Concretefilled Steel Tube Specimen Under Lateral Impact

摘要:

对两端固定的钢管混凝土构件在冲击作用下的动力响应进行数值模拟,通过分析构件支座与跨中“塑性铰”形成机制及特征,提出了圆钢管混凝土构件在侧向冲击作用下的简化分析模型.一系列工况的比较与验证表明，简化分析模型估算结果与数值模拟结果误差较小,该模型在估算跨中、支座动态截面极限弯矩以及跨中截面最大挠度方面,可以得到比较满意的计算结果,可为工程提供参考.

Abstract:

The dynamic response of fixedend concretefilled steel tube specimens under lateral impact is numerically simulated.The developing mechanics and characteristics of “plastic hinges” at the location of the midspan and support section of these specimens are then analyzed.At last,a simplified analytic model is put forward to predict the maximum deflection of circular concretefilled steel tube specimen under lateral impact.The comparisons and validations of a set of cases show that the results from the simplified analytic model agree well to the results from the numerical model.The simplified analytic model can give an ideal prediction on the dynamic ultimate moments of the support and midspan sections and the maximum deflection of the midspan.It can also be referenced by engineering.