框架—剪力墙层间隔震结构随机响应与动力可靠度研究

发布时间：2018-06-25 15:43

本文选题：框架-剪力墙层间隔震结构 + Bouc-Wen模型　；参考：《广州大学》2017年硕士论文

【摘要】：层间隔震结构是指将隔震层设置在基础之上的某一层柱顶与楼面之间,是在基础隔震结构的工程实践中发展起来的一种新型隔震形式。另外,地震是一种灾害性的自然现象,具有很强的随机性,因此利用随机动力可靠度理论与研究成果对框架-剪力墙层间隔震结构进行随机响应分析不仅可以更加真实的反映地震的不确定性,而且利用随机响应结果可以进一步分析结构的动力可靠度,从而又可以利用动力可靠度来判别结构的主要失效模式,以确定决定结构安全度的主控因素。本文根据随机振动理论,结合虚拟激励法,采用零均值平稳的Clough-Penzien双过滤功率谱模型对一栋12层(模型1)和一栋10层(模型2)的框架-剪力墙层间隔震结构在小震与大震作用下的随机响应进行了分析,以隔震层和其他各层的最大层间位移响应作为控制指标,建立极限状态方程,采用当量正态化法(JC法),通过串联模式,然后根据MATLAB自编程序,进而计算出结构的动力可靠度,然后通过动力可靠度判别框架-剪力墙层间隔震结构的主控失效模式,为保障框架-剪力墙层间隔震体系的地震安全提供理论基础。本文的主要内容如下:1、框架-剪力墙层间隔震结构动力方程的建立。首先探讨了框架-剪力墙层间隔震结构非比例阻尼模型的选取和恢复力模型的选取及其等效线性化,然后将框架-剪力墙层间隔震结构简化为多质点体系,并假定小震下结构处于弹性状态,隔震层的恢复力模型采用等效的线弹性模型;大震下结构处于弹塑性状态,隔震层的恢复力采用非退化的Bouc-Wen模型,其他楼层的恢复力采用退化的Bouc-Wen模型,分别建立小震与大震作用下框架-剪力墙层间隔震结构的动力分析方程,最后利用Etabs分析软件建立了本文的有限元模型,并对模型进行了模态分析。2、框架-剪力墙层间隔震结构随机响应分析。首先对虚拟激励法和蒙特卡洛法的基本原理做了简要介绍,然后根据虚拟激励法分别建立了小震和大震作用下框架-剪力墙层间隔震结构的随机响应算法,又结合模型1和模型2进行了随机响应分析,最后利用Monte Carlo法对随机响应计算结果进行了检验,并与非隔震结构的响应进行了对比。3、框架-剪力墙层间隔震结构动力可靠度分析。在得到结构各层的层间位移响应峰值统计量的基础上,建立极限状态下的功能状态方程,利用当量正态化法,通过串联模式,并假定各子结构之间相互独立且小震下结构失效互不相关、大震下结构各部分失效相关,对模型1和模型2的动力可靠度进行了研究,然后采用模型1为算例,根据“小震不坏,中震可修,大震不倒”抗震设防标准,将地震灾害分为三个等级,比较了框架-剪力墙层间隔震结构与非隔震结构在50年设计基准期内发生各震害等级时结构的整体可靠度。4、粘滞阻尼器层间混合隔震结构随机动力可靠度研究。为了限制隔震层在大震作用下的位移,提高结构的整体可靠度,提出在隔震层增设粘滞阻尼器的层间混合隔震体系,通过改变粘滞阻尼器的速度指数和粘滞阻尼系数,系统的研究了粘滞阻尼器层间混合隔震结构的随机动力可靠度。5、基于动力可靠度框架-剪力墙层间隔震结构的参数分析。基于动力可靠度,针对框架-剪力墙层间隔震体系,对不同隔震层刚度、不同隔震层位置以及不同场地类别情况下在小震与大震作用时的减震效果进行了探讨。
[Abstract]:The interlayer isolation structure is a new type of isolation form which is developed in the engineering practice of base isolation structure. In addition, the earthquake is a natural phenomenon of catastrophic nature and has very strong randomness. Therefore, the theory of random dynamic reliability and the research results are used. The random response analysis of frame shear wall structure can not only reflect the uncertainty of the earthquake more truly, but also make use of the random response results to further analyze the dynamic reliability of the structure, so that the dynamic reliability of the structure can be used to determine the main failure mode of the structure, so as to determine the safety of the structure. Based on the random vibration theory and the virtual excitation method, this paper analyses the random response of a 12 layer (model 1) and a 10 layer (model 2) frame shear wall structure with 12 layers (model 1) and a 10 layer (model 2) under the action of small earthquakes and large earthquakes. The maximum interlayer displacement response is used as the control index, the limit state equation is established, and the equivalent normalization method (JC method) is adopted to calculate the dynamic reliability of the structure through the series mode and then according to the MATLAB self compiled program, and then the main control failure mode of the frame shear wall isolation structure is identified by the dynamic reliability, in order to guarantee the frame shear. The theoretical basis of seismic safety of force wall interlayer isolation system is provided. The main contents of this paper are as follows: 1, the establishment of dynamic equations of frame shear wall interlayer isolation structure. First, the selection of non proportional damping model and the selection of restoring force model and the equivalent linearization of the frame shear wall interlayer isolation structure are discussed, and then the frame shear wall is used. The interlayer isolation structure is simplified as a multi particle system, and it is assumed that the structure is elastic under small earthquakes, the resilient model of the isolation layer adopts the equivalent linear elastic model, the structure is in the elastoplastic state under the large earthquake, the recovery force of the isolation layer adopts the non degenerate Bouc-Wen model, and the restoring force of the other floor is constructed by the degenerated Bouc-Wen model, respectively. Li Xiaozhen and the dynamic analysis equation of the frame shear wall interlayer structure under the action of the large earthquake, and finally use the Etabs analysis software to establish the finite element model of this paper, and carry out the modal analysis of the model.2, the random response analysis of the frame shear wall isolation structure. First, the basic principles of the pseudo excitation method and the Monte Carlo method are made. According to the virtual excitation method, the random response algorithm of the frame shear wall interlayer structure under the action of small earthquake and large earthquake is established, and the random response analysis is carried out with model 1 and model 2. Finally, the results of the random response calculation are tested by Monte Carlo method, and the response to the non isolation structure is carried out. The dynamic reliability analysis of frame shear wall interlayer isolation structure is compared with.3. On the basis of the peak statistics of the interlayer displacement response of each layer, the function state equation is established under the limit state, and the equivalent normalization method is used to pass the series mode, and the structure failure of each sub structure is independent and the structure failure is not related to each other. The dynamic reliability of the model 1 and model 2 is studied under the large earthquake. Then the model 1 is used as an example to divide the earthquake disaster into three grades according to the standard of "small earthquakes not bad, moderate earthquake repairable, large earthquake not falling", and compare the design of frame shear wall isolation structure and non isolation structure in 50 years. In the base period, the overall reliability of the structure is.4, and the random dynamic reliability of the composite isolation structure is studied. In order to limit the displacement of the seismic isolation layer and improve the overall reliability of the structure, a hybrid isolation system with viscous dampers is put forward in the isolation layer, and the viscous resistance is changed by changing the viscosity resistance. The velocity index and viscous damping coefficient of the NEB are studied systematically for the random dynamic reliability.5 of the viscous dampers, based on the parameter analysis of the frame shear wall structure with the dynamic reliability. Based on the dynamic reliability, the stiffness of the different isolation layers and the different isolation are based on the frame shear wall interlayer isolation system. The effect of shock absorption under small earthquake and large earthquake is discussed in the case of location and different site types.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.16;TU352.12

【参考文献】