自复位防屈曲支撑及其钢框架结构的抗震性能分析

发布时间：2018-01-02 16:21

本文关键词：自复位防屈曲支撑及其钢框架结构的抗震性能分析　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：虽然传统的抗震结构体系通过合理的设计能够保证结构的安全，但是它们主要依靠主体结构的破坏来耗散地震能量。由于结构弹塑性变形过大引起的受力构件破坏或者震后残余变形较大，使得结构在震后不能继续使用并且难于修复。因此，研究一种在震后能够恢复到原来位置的结构体系来减小结构的破坏是一个亟待解决的问题。为实现这种结构，本文通过自复位防屈曲支撑来控制结构最大地震响应及实现结构自复位。为此，本文主要进行了以下工作：（1）介绍了自复位防屈曲支撑的构造组成及组装方式，，验算其强度、刚度及稳定性并阐述其工作原理、复位筋的力学性能及复位条件，最后给出支撑的性能评价指标。基于ABAQUS平台设计了自复位防屈曲支撑并建立其实体有限元模型。（2）对自复位防屈曲支撑进行参数分析，分别以初始弯曲、复位筋截面面积、内核心截面面积、复位筋的弹性模量为分析参数。分析表明，自复位防屈曲支撑的耗能性能及复位性能受初始弯曲的影响不大；增加复位筋截面面积，支撑的复位能力增强，残余变形变小；增加内核心截面面积，支撑的复位能力减弱，残余变形增大；复位筋的弹性模量越小，支撑的滞回曲线越饱满，耗能能力越强，但是残余变形也越大。（3）采用杆单元和非线性弹簧并联实现自复位防屈曲支撑构件在结构体系中的简化建模，建立自复位防屈曲支撑钢框架和防屈曲支撑钢框架有限元模型，基于三条地震动记录对应于多遇地震、罕遇地震及特大地震的地震作用，对自复位防屈曲支撑钢框架结构进行弹塑性时程分析。从结构顶层位移反应、楼层最大位移、层间位移角、残余变形及基底剪力等方面与防屈曲支撑钢框架进行对比分析。研究表明，自复位防屈曲支撑在控制结构地震响应和减小残余变形方面优于防屈曲支撑钢框架结构。（4）研究自复位防屈曲支撑的第一刚度、第二刚度、预应力及内核心截面面积四个参数的变化对结构体系抗震性能的影响。首先进行单一参数变化下的自复位防屈曲支撑钢框架结构地震响应分析，研究了特大地震作用下各个参数对结构抗震性能的影响。然后，通过正交设计与均匀设计确定结构参数的组合方式，分析了各参数对结构抗震性能的影响，并基于极差和方差分析确定各参数对结构顶层最大位移、基底剪力及顶层残余变形影响的顺序。最后，基于正交设计和均匀设计的分析结果，建立了结构地震响应与各影响参数的回归方程。
[Abstract]:Although the traditional seismic structure system through reasonable design can ensure the safety of the structure, but they rely mainly on the main structure of the failure to dissipate seismic energy. Due to structural elastoplastic large deformation caused by residual stress component failure or postseismic deformation is large, the structure after the earthquake can not continue to use and difficult to repair. Therefore, research a return to the original position of the structure to reduce the structural damage in the earthquake is an urgent problem to be solved. For this structure, the self reset BRB to control the seismic response of the bridge structure and Realization of self reset. Therefore, this paper carried out the following work:
(1) introduces the composition and structure of self assembling reduction of BRBs, checking its strength, rigidity and stability and expounds its working principle, mechanical properties and reinforcement of the reset reset condition, performance evaluation index is given. Based on the support of ABAQUS platform for self reset BRB and establishes the solid finite element model design.
(2) the self reset BRB parameters analysis, respectively with initial bending reinforcement cross-sectional area reduction, the core section area, elastic modulus reduction and Reinforcement Analysis for the parameters. The results show that, since the reduction of energy dissipation and anti reduction performance is affected by the initial bending buckling support is increased; a reset rib section area. Enhance the ability to support the reduction, the residual deformation becomes smaller; the increase in the core area, weaken the ability to support the reduction, the residual deformation increases; the elastic modulus reduction bar is small, support the hysteretic curve of more full capacity of energy dissipation is higher, but the residual deformation is also greater.
(3) the nonlinear spring bar element and the parallel realization of simplified modeling of self resetting of BRB components in the structure system, the establishment of self reduction of buckling restrained braced steel frame and BRB steel frame finite element model, corresponding to the earthquake records of three earthquake based on earthquake earthquake and earthquake the self reset buckling, elastic-plastic time history analysis of steel frame structure. The reaction from the top of the structure support displacement, the maximum displacement of the floor, story drift, the residual deformation and base shear and buckling restrained braced steel frame were analyzed. The results show that the self reduction of buckling restrained brace in seismic response and control to reduce the residual deformation than the buckling restrained braced steel frame structure.
(4) research on self reset BRB's first second stiffness, stiffness, impact of changes of the four parameters in the core section area of prestressed and seismic performance of the structure. The first single parameter self reset BRBs seismic response analysis of steel frame structure, study the effects of various parameters of the earthquake. On the seismic performance. Then, determine the combination of structural parameters by orthogonal design and uniform design, analyzes the influence of various parameters on the structural seismic performance, and based on the range analysis and variance analysis to determine the parameters of maximum displacement on the top of the structure, influence of base shear and top residual deformation sequence. Finally, the results of orthogonal design and based on uniform design, regression equation was established and the influence of parameters of the seismic response of the structure.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU391;TU352.11

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