两种装配式墙体结构随机地震响应分析及动力可靠度研究

发布时间：2018-03-23 02:21

本文选题：生态复合墙结构　切入点：新型装配式混凝土结构　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国“建筑工业化、住宅产业化”进程加快,一批适合我国国情和地域特点的新型装配整体式混凝土结构体系应运而生。生态复合墙结构主要采用装配整体式施工方案,由预制的生态复合墙板和混凝土边缘连接构件及楼板装配现浇而成,在特有的构造组合以及不同材料的使用下具有良好的抗震性能;新型装配式混凝土结构是针对生态复合墙结构高度限制(18层以下)而提出,具有施工快捷、连接可靠、耗能减震等优势,采用装配整体式施工方案,由预制混凝土板、现浇边缘约束构件及楼板(现浇或叠合)现浇而成。本文在课题组前期研究基础上,建立两种装配式墙体结构宏观单元数值模型;对两种装配式墙体结构和异形柱框架结构进行了随机振动响应分析;通过结构反应功率谱增大输入激励幅值,提出基于反应功率谱的重要抽样法,并两种装配式墙体结构和异形柱框架结构进行动力可靠度对比分析。本文主要研究内容有:1.提出两种装配式墙体结构宏观单元模型。对于生态复合墙结构,在弹性阶段,将生态复合墙板等效为复合弹性板力学模型,在弹塑性阶段,将生态复合墙板等效为等效斜撑力学模型;对新型装配式混凝土墙体结构模型,将新型装配式混凝土墙板等效为改进多竖杆力学模型。试验结果与数值分析表明:两种结构宏观单元模型均能满足结构的弹塑性全过程计算精度要求,可用于两种装配式墙体结构的随机地震响应和动力可靠度分析。2.对几种主要随机地震输入动模型进行总结和研究,选取Clough-Penzien模型作为地震动输入模型,进行两种装配式墙体结构和异形柱框架结构的随机地震响应分析,探讨两种装配式墙体结构和异形柱框架结构在四种不同场地类别构成的四种地震动工况下结构随机响应。计算分析结果表明:两种装配式结构位移、速度响应远小于异形柱框架结构,且新型装配式混凝土结构小于生态复合墙结构;两种装配式结构加速度响应远大于框架结构,新型装配式混凝土结构大于生态复合墙结构;两种装配式结构位移、速度结构功率谱密度曲线峰值远小于异形柱框架结构,新型装配式混凝土结构小于生态复合墙结构;两种装配式结构加速度结功率谱密度曲线峰值大于异形柱框架结构,新型装配式混凝土结构大于生态复合墙结构。3.本文通过对结构反应功率谱增大其输入激励幅值,提出结构基于反应功率谱的重要抽样法,并根据均匀调制非平稳地震动模型求得两种装配式墙体结构和异形柱框架结构基于首次超越破坏准则的随机反应顶点位移动力可靠度。计算分析结果表明:在概率意义上,新型装配式混凝土结构性能优于生态复合墙结构,生态复合墙结构的性能优于异形柱框架结构。
[Abstract]:With the acceleration of the process of "building industrialization and housing industrialization" in our country, a batch of new assembled integral concrete structure system, which is suitable for the national conditions and regional characteristics of our country, came into being. The ecological composite wall structure mainly adopts the assembly integral construction scheme. It is made of prefabricated ecological composite wall panels and concrete edge connecting members and floor slabs assembled and cast-in-place, which has good seismic performance under the special structural combination and the use of different materials. A new type of prefabricated concrete structure is put forward to limit the height of ecological composite wall structure below 18 stories. It has the advantages of quick construction, reliable connection, energy dissipation and shock absorption, etc. The cast-in-place edge restrained member and floor slab (cast-in-place or superimposed) are cast-in-situ. On the basis of the previous research of the research group, two kinds of macro-element numerical models of prefabricated wall structure are established in this paper. The random vibration responses of two kinds of fabricated wall structures and special-shaped column frame structures are analyzed, and the important sampling method based on the response power spectrum is proposed to increase the input excitation amplitude through the structural response power spectrum. The dynamic reliability of two kinds of fabricated wall structures and special-shaped column frame structures are compared and analyzed. The main contents of this paper are: 1.The macroscopical element models of two kinds of fabricated wall structures are put forward. For ecological composite wall structures, in the elastic stage, The ecological composite wall plate is equivalent to the composite elastic plate mechanical model, and in the elastoplastic stage, the ecological composite wall board is equivalent to the equivalent oblique bracing mechanical model. The new fabricated concrete wall slab is equivalent to an improved multi-bar mechanical model. The experimental results and numerical analysis show that the two kinds of macroscopical element models can meet the requirements of the elastic-plastic calculation accuracy of the whole process of the structure. It can be used to analyze the random seismic response and dynamic reliability of two kinds of prefabricated wall structures. 2. Several main random earthquake input dynamic models are summarized and studied. The Clough-Penzien model is selected as the ground motion input model. The random seismic response analysis of two kinds of fabricated wall structures and special-shaped column frame structures is carried out. The random responses of two fabricated wall structures and special-shaped column frame structures under four ground motion conditions with four different site types are discussed. The results of calculation and analysis show that the displacement of the two prefabricated structures is different. The velocity response is much smaller than the special-shaped column frame structure, and the new fabricated concrete structure is smaller than the ecological composite wall structure, the acceleration response of the two fabricated structures is much greater than the frame structure, the new type of prefabricated concrete structure is larger than the ecological composite wall structure. The peak value of power spectral density curve of velocity structure is much smaller than that of special-shaped column frame structure, and the new fabricated concrete structure is smaller than ecological composite wall structure. The peak value of acceleration junction power spectrum density curve of two fabricated structures is greater than that of special-shaped column frame structure, and the new fabricated concrete structure is larger than that of ecological composite wall structure. An important sampling method based on reactive power spectrum is proposed. Based on the uniformly modulated non-stationary ground motion model, the dynamic reliability of random response vertex displacement of two fabricated wall structures and special-shaped column frame structures based on the first transcendental failure criterion is obtained. The results of calculation and analysis show that, in the sense of probability, The performance of the new type of prefabricated concrete structure is better than that of the ecological composite wall structure and the ecological composite wall structure is superior to the special-shaped column frame structure.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU37;TU311.3

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