【摘要】 为了模拟火灾下结构倒塌破坏行为,需要开发能够反映结构火灾整体行为的高效数值模型。该文基于纤维梁模型和分层壳模型开发了混凝土框架火灾倒塌分析程序,对程序中采用的材料高温力学模型进行了分析与检验,并通过对构件抗火性能试验的模拟验证了程序的计算精度。最后,该文利用该倒塌分析程序对一个八层框架结构的火灾倒塌过程进行了模拟,分析了结构在火灾下的倒塌机理。更多还原

【Abstract】 High efficient numerical models that can simulate the behaviors of an entire structural system are very important to the study on the fire-induced progressive collapse of RC frame structures.A fire-induced collapse simulation program is developed,which is based on the fiber beam model and the multi-layer shell model.The constitutive models of materials at high temperature are discussed.And the accuracy of the program in simulating RC members in fire is verified by test results.At last,the progressive collapse of an 8-storey frame in fire is simulated and the mechanism of collapse is discussed.更多还原