轻型消能摇摆结构体系抗震性能评估与动力可靠度分析

发布时间：2018-01-15 18:22

本文关键词：轻型消能摇摆结构体系抗震性能评估与动力可靠度分析　出处：《兰州理工大学》2013年博士论文　论文类型：学位论文

【摘要】：在我国现有及新建建筑中,钢筋混凝土框架结构是最主要的结构体系,但是从近年来几次实震的震害来看,钢筋混凝土框架结构在地震中的表现并不尽如人意。究其原因不难发现,现行的钢筋混凝土框架结构抗震设计方法在整体的抗震设计上仍存在不均匀性,同时由于各方面条件的限制在施工过程中存在诸多不确定性的危险因素,因此钢筋混凝土框架结构在强烈地震作用下会有很多的安全性问题。如何切实有效的提高现有或新建钢筋混凝土框架结构在地震作用下的可靠性和安全性,成为工程设计人员与研究人员关注的焦点之一。本文针对这一问题,在现有研究成果的基础之上提出了轻型消能摇摆结构体系的结构设计方案,利用基于性能的抗震设计理论,系统的研究了轻型消能摇摆结构体系在地震动作用下的变形模式、耗能机制以及动力可靠度等问题。主要内容包括以下几个方面： (1)首先以实际工程结构为研究对象,分别构建了钢筋混凝土框架结构、轻型摇摆刚架结构和轻型消能摇摆刚架结构的精确有限元模型。其次对钢筋混凝土框架结构体系和轻型摇摆刚架结构体系分别进行基于位移的静力弹塑性推覆分析。最后以所获得分析结果为依据,结合我国现行建筑抗震设计规范,着重探讨了不同刚度比的钢管混凝土摇摆刚架对结构体系整体抗震性能的影响。 (2)针对钢筋混凝土框架结构、轻型摇摆刚架结构和轻型消能摇摆刚架结构三种结构体系建立了动力计算模型和运动微分方程。首先利用动力弹塑性时程分析法对其进行分析求解,获得了各结构体系在地震动作用下的结构动力响应。其次从能量的角度出发,利用能量法对三种结构体系的耗能机制进行计算和研究。最终探讨了三种结构体系在强烈地震作用下的动力响应和耗能机制对各结构体系抗震性能的影响。 (3)采用增量动力分析方法,选取实际地震动记录20条,对钢筋混凝土框架结构、轻型摇摆刚架结构和轻型消能摇摆刚架结构三种结构体系进行从弹性到弹塑性,直至结构失效全过程的分析。依据所获取的分析结果,绘制了各结构体系基于不同损伤指标的IDA曲线,并分别对其进行16%、50%、84%分位的IDA曲线分析,获取了不同水平地震动作用下各结构体系的抗震性能水准。 (4)对轻型摇摆刚架结构体系的随机响应进行了分析,在考虑了地震动作用的不确定性的同时,利用虚拟激励法与状态空间分析相结合的方法,计算了不同刚度比的钢管混凝土摇摆刚架对轻型摇摆刚架结构体系在多遇及罕遇地震动作用下动力可靠度的影响。根据所获取的各层的条件失效概率进一步计算了各结构体系的条件失效概率 (5)针对各结构体系的地震动响应,进行了模拟地震动的振动台试验研究。结合实际工程和理论分析,分别制作了钢筋混凝土框架结构、轻型摇摆刚架结构和轻型消能摇摆刚架结构的的缩尺试验模型,并最终进行了33个工况的振动台实验,得到了动力荷载作用下结构模型各测点的动力响应数据。通过与理论分析和数值仿真的计算结果相对比,发现试验的最终结果与理论分析的规律相吻合。
[Abstract]:In our existing and new buildings, the reinforced concrete frame structure is the main structure system, but from several real earthquake disaster in recent years, performance of reinforced concrete frame structure in the earthquake is not satisfactory. The reason is not difficult to find the existing reinforced concrete frame structure seismic mix design method is not the uniformity in the seismic design of the whole, at the same time, due to various constraints there are many uncertainties in the risk factors in the construction process, so the reinforced concrete frame structure under the strong earthquake will have many security problems. How to effectively improve the existing or new reinforced concrete frame structure reliability and safety in the earthquake under the action of the engineering staff and become one of the focus of the researchers. Aiming at this problem, on the basis of the existing research results. The light energy dissipation structure design of swing structure system, using the theory of performance-based seismic design, system of structure vibration swing deformation mode under the action of light energy dissipation, energy dissipation mechanism and dynamic reliability problems. The main contents include the following aspects:
(1) first to actual engineering structure as the research object, were constructed of reinforced concrete frame structure, frame structure and light swing light energy dissipation frame rocking precise finite element model. The reinforced concrete frame structure and light swing frames are respectively analyzed static elastic plastic displacement nappe based on the analysis of the results obtained in the end. As the basis, combined with the current seismic design code for building, discusses the influence of stiffness ratio of CFST frame swing overall seismic performance of structure system.
(2) for reinforced concrete frame structure, frame structure and light swing light energy dissipation swing frame structure of three kinds of structure system to establish a dynamic calculation model and the differential equations of motion. The dynamic elastic-plastic time history analysis method to carry on the analysis, obtained the structure in the seismic structure under dynamic loads the response from the perspective of energy. Secondly, calculation and research using the energy method, energy dissipation mechanism of three kinds of structure system. Finally discusses the influence of three kinds of structure system under the strong earthquake dynamic response and energy dissipation mechanism on the seismic performance of the structure of the system.
(3) the incremental dynamic analysis method, select the actual record of 20, the reinforced concrete frame structure, frame structure and light swing light energy dissipation swing frame structure of three kinds of architecture from elastic to elastic-plastic failure analysis, the whole process of the structure. According to the analysis results to the acquisition. The contours of the structure system based on the IDA curve of different damage index, and 16% respectively, on the 50%, IDA analysis of 84% points, get a different level of ground motion under the action of the seismic performance level of the structure of the system.
(4) random response to light swing frame structures are analyzed, considering the effect of ground motion uncertainty at the same time, combined with the method of using virtual excitation method and state space analysis, calculation of the different stiffness ratio of CFST frame of lightweight swing swing frame structure system in dynamic effect the reliability under frequent earthquake and rare earthquake. According to each layer of the conditional failure probability of further calculate the conditional failure probability of structure system
(5) according to the structure of the seismic response, the shaking table test of seismic simulation. Combined with the practical engineering and theoretical analysis are made of reinforced concrete frame structure, frame structure and light swing light energy dissipation swing frame structure of the scale test model, and finally the 33 conditions. The shaking table experiment, obtained the measuring point dynamic structure model under dynamic load response data. Through theoretical analysis and numerical simulation calculation and comparison of the results, found the final results and theoretical analysis are consistent.

【学位授予单位】：兰州理工大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU352.11

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