钢网格盒式结构在近断层地震作用下的动力响应分析

发布时间：2019-01-06 07:45

【摘要】：钢网格盒式结构作为一种新型结构体系,与传统结构体系相比,在受力特点、建筑功能及经济性方面,有着较好的推广前景。随着城市建设范围的扩张,越来越多的建筑极有可能处在近断层区域,由于含有速度脉冲效应的近断层地震动对结构的影响与结构自身周期密切相关,会显著改变结构的动力响应,而目前针对钢网格盒式结构抗震性能的研究并没有考虑到近断层地震作用对结构的影响,因此,研究此类新型结构体系在近断层地震作用下的抗震性能就具有重要的现实意义。本文主要进行了以下几方面的研究工作:(1)对近断层地震动的基本特征进行了全面详细的介绍,并结合本文所选取地震记录,对近断层脉冲型、近断层非脉冲型以及一般中远场地震记录进行了反应谱对比分析。(2)对钢网格盒式结构体系的基本原理和力学特点进行了介绍,以多层和高层钢网格盒式结构为对象,建立结构的有限元分析模型,对钢网格盒式结构进行了动力特性分析,明确了结构的自振特性。(3)建立了多层和高层钢网格盒式结构非线性分析模型,利用非线性时程分析法,选择近断层脉冲型、近断层非脉冲型以及一般中远场地震记录作为地震动输入,对钢网格盒式结构进行了地震反应分析,从结构的位移反应、顶点加速度、基底剪力以及塑性铰的分布方面考察了结构在不同地震作用下的动力响应。(4)通过对地震反应分析结果进行对比,可以得出:结构在近断层地震作用下的动力响应要大于一般中远场地震作用下的动力响应。由于速度脉冲效应对结构的影响与结构自身周期密切相关,因此,多层钢网格盒式结构在近断层脉冲型地震作用下的动力响应小于近断层非脉冲型地震作用下的动力响应,而对于高层钢网格盒式结构,近断层脉冲型地震作用下的动力响应显著大于近断层非脉冲型地震作用下的动力响应。(5)近断层脉冲型地震作用会显著增加高层结构的位移及基底剪力需求,特别是改变高层结构的层间位移沿层高的分布规律,在对此类型高层钢网格盒式结构进行抗震设计时,要充分考虑到这一不利因素的存在。
[Abstract]:As a new type of structural system, the steel mesh box structure has a good prospect in the aspects of stress characteristics, building function and economy compared with the traditional structure system. With the expansion of urban construction scope, more and more buildings are likely to be located in the near fault area. The influence of near-fault earthquake with velocity pulse effect on the structure is closely related to the structure cycle. The dynamic response of the structure will be significantly changed, but the seismic behavior of the steel mesh box structure has not been studied in consideration of the effect of near-fault seismic action on the structure. It is of great practical significance to study the seismic behavior of this kind of new structural system under near-fault earthquake. The main work of this paper is as follows: (1) the basic characteristics of near-fault ground motion are introduced in detail, and combined with the seismic records selected in this paper, the near fault pulse type is analyzed. In this paper, the response spectra of nonpulse and general seismic records of near fault and middle and far field are compared and analyzed. (2) the basic principle and mechanical characteristics of steel mesh box structure system are introduced, and the multi-layer and high-rise steel mesh box structure is taken as the object. The finite element analysis model of the structure is established, the dynamic characteristics of the steel mesh box structure are analyzed, and the natural vibration characteristics of the structure are clarified. (3) the nonlinear analysis models of the multi-layer and high-rise steel mesh box structures are established. Using nonlinear time history analysis method, the seismic response of steel grid box structure is analyzed by selecting near fault pulse type, near fault non-pulse type and general middle and far field seismic record as ground motion input, and the displacement response of the structure is analyzed from the view of the displacement response of the structure. The dynamic responses of structures subjected to different earthquakes are investigated in terms of the acceleration of the vertex, the shear force of the base and the distribution of plastic hinges. (4) the results of seismic response analysis are compared. It can be concluded that the dynamic response of the structure under near-fault earthquake is larger than that under the general far-field earthquake. Because the influence of velocity pulse effect on the structure is closely related to the period of the structure itself, the dynamic response of the multi-layer steel mesh box structure under the near-fault impulse earthquake is less than that under the near-fault non-pulse type earthquake. For high-rise steel mesh box structures, The dynamic response of near-fault impulse earthquake is significantly larger than that of near-fault non-pulse earthquake. (5) the displacement of high-rise structure and the demand of base shear force are significantly increased by near-fault impulse earthquake. Especially to change the distribution of interstory displacement along the floor height of high-rise structure, the existence of this unfavorable factor should be fully taken into account in the seismic design of this type of high-rise steel mesh box structure.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391

【参考文献】