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常规的结构抗火设计主要针对构件,但实际结构系统中的构件受力更为复杂。为分析整体结构在火灾下的破坏和倒塌,基于纤维梁模型和简化楼板建模方法,建立了一个8层混凝土框架整体结构数值模型。分析不同结构位置处3开间发生火灾时的整体结构力学响应。结果表明:框架柱在压弯组合作用下更易发生破坏。当结构短边受火作用时,由于结构内力重分布能力不足,柱破坏会触发结构连续倒塌。而其他结构部位受火时,周边结构能够有效分担受火区域的荷载,从而抵抗连续倒塌的发生。
The conventional structure of fire-resistant design is mainly for components, but the components in the actual structural system are more complicated. In order to analyze the damage and collapse of the whole structure under the fire, an eight-layer numerical model of the whole structure of the concrete frame was established based on the fiber-beam model and the simplified floor modeling method. Analysis of the overall structural mechanics response to fire in 3 bays at different structure locations. The results show that the frame column is more prone to damage under the combination of bending and bending. When the short side of the structure is exposed to fire, the failure of the column will trigger the continuous collapse of the structure due to the insufficient redistribution of the internal forces of the structure. When other structural parts are exposed to fire, the surrounding structures can effectively share the load in the fire area and thus resist the occurrence of continuous collapse.