城市区域建筑震害高真实度模拟

Realistic simulation for seismic damages of buildings in an urban area

基于精细化的结构模型和物理引擎技术,实现城市区域建筑震害的准确预测和真实感显示。采用多自由度的精细的结构模型,通过非线性时程分析方法准确地预测城市区域大规模建筑的震害特征,并获得建筑各个楼层的震害细节。提出基于精细化预测结果的建筑震害动态可视化方法,真实地表现了建筑震害过程。在此基础上,提出一个综合物理引擎、图形引擎和时程分析的模拟算法,展示建筑倒塌过程中的复杂运动和交互碰撞。选择我国一个真实的中型城市作为算例进行区域建筑震害模拟,结果表明基于物理引擎的模拟方法弥补时程分析方法在倒塌分析上的不足,完整、准确、具有真实感地模拟区域建筑震害全过程,为城市区域建筑的防灾减灾提供技术支持。

Accurate prediction and realistic visualization for seismic damages of buildings in urban areas are achieved by employing refined structural model and physics engine. By adopting a refined structural model with multiple degree-offreedoms,the seismic damages of many buildings in an urban area are predicted accurately based on non-linear timehistory analysis( THA),and the damage details for different stories of buildings are explicitly obtained. Based on seismic damage prediction,a dynamic visualization method is proposed for realistically visualizing the seismic damage processes of buildings. Besides,an algorithm with an integration of physics engine,graphics engine and THA is proposed to simulate complex movements and interactive collisions during the collapse process of building. An actual medium-sized Chinese city is used to demonstrate seismic damage simulation of buildings. The results indicate that the proposed methods are superior to the THA since they may simulate the complete seismic damage process of building accurately and realistically,providing technical reference for urban disaster prevention and reduction.