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高层建筑是城市建筑的重要组成部分,现有建筑震害预测模型难以满足城市区域高层建筑群震害分析的要求。该文提出了一套非线性多自由度弯剪耦合模型(NMFS)以及其参数标定方法。该模型:1)能模拟高层建筑显著的弯剪耦合变形行为。与传统的剪切层模型对比,该模型能准确的模拟高层建筑的层间位移角包络,其结果与精细有限元模型的结果非常接近;2)具有非常高的计算效率。与精细有限元模型对比,该模型的计算加速比超过60000倍;3)参数标定简单。仅需要借助于少量的建筑属性信息(结构高度、建设年代、设计信息和结构类型)就能生成整个模型的弹塑性参数;4)能输出各层时程响应以及层间位移角情况,使未来基于工程需求参数(EDP)的区域高层建筑经济损失预测成为了可能。论文针对一栋典型高层结构详细展示了模型的建立与标定流程,并对标定参数的准确性进行了校验。最后对北京CBD地区高层建筑群进行了震害模拟,验证了该方法在城市区域中应用的可行性。该文的成果期望为未来区域高层建筑的地震损失预测提供参考。
The high-rise building is an important part of the urban architecture. The existing building earthquake damage prediction model can not meet the requirements of the earthquake damage analysis of the high-rise buildings in the urban area. This paper presents a set of nonlinear multi-DOF bending-shear coupling model (NMFS) and its parameter calibration method. The model: 1) Can simulate the significant bending-shear coupling deformation behavior of tall buildings. Compared with the traditional shear layer model, this model can accurately simulate the drift angle envelope of high-rise buildings, and the result is very close to that of the finite element model.2) It has a very high computational efficiency. Compared with the fine finite element model, the model’s calculation speedup is more than 60,000 times; 3) Parameter calibration is simple. The elasto-plastic parameters of the whole model can be generated only by means of a small amount of building attribute information (structure height, construction age, design information and structure type); 4) The output of the time-history response of layers and the displacement angle of layers can make the future It is possible to predict the economic loss of the regional high-rise buildings based on the engineering requirements parameters (EDP). The paper shows a typical high-rise structure in detail the establishment of the model and calibration process, and calibration parameters of the accuracy of the calibration. Finally, the earthquake damage simulation is carried out on the high-rise buildings in the CBD of Beijing, which proves the feasibility of the method applied in the urban area. The expectation of the paper is to provide reference for the prediction of earthquake loss in the future high-rise buildings in the region.