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为了了解超高层建筑在地震作用下的非连续坍塌特征,以基于颗粒流理论的PFC3D作为模拟平台,模拟了某市内一拟建超高层建筑在地震作用下的坍塌过程。按照建筑物为核心筒-框架结构,且具有两变阶的特点构建模型,并分别施加了加速度a=0.2 g,0.3 g,0.4 g的正弦地震波,震动时间为9s,模拟时间为90 s。模拟结果表明:在a=0.2 g时,建筑物最终结构完整,符合7度抗震设计要求;a=0.3 g,0.4 g时,建筑物最终完全坍塌,其过程为:首先从核心筒中与震动方向相同的剪力墙开始破坏,然后是垂直震动方向的剪力墙折断,上部核心筒在整体完整情况下再次折断,下部框架分离,整体建筑垂直坍塌;a=0.4 g时的坍塌速度大约是a=0.3 g时坍塌速度的2倍。最后针对坍塌过程特征,提出了抗震构造措施。
In order to understand the non-continuous collapse characteristics of super high-rise buildings under earthquake action, PFC3D based on particle flow theory is used as a simulation platform to simulate the collapse process of a proposed high-rise building under earthquake in an urban area. According to the core-frame structure of the building, the model is constructed with two-order variations. Sinusoidal seismic waves with a = 0.2 g, 0.3 g and 0.4 g acceleration are respectively applied. The shaking time is 9 s and the simulation time is 90 s. The simulation results show that the final structure of the building is complete at a = 0.2 g and meets the requirements of 7 degree seismic design. When a = 0.3 g and 0.4 g, the building finally collapses. The process is as follows: The same shear wall begins to break down, and then the shear wall in the direction of vertical vibration breaks off. The upper core tube is broken again under the complete integrity, the lower frame is separated and the whole building collapses vertically. The collapse speed at a = 0.4 g is about a Collapse rate 2 times at 0.3 g. Finally, in view of the characteristics of collapse process, proposed seismic structure measures.