跨越地裂缝框架结构在复杂灾变作用下的分析研究

发布时间：2018-05-09 08:56

本文选题：地裂缝 + 地震作用　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：自二十世纪五十年代至今,西安地裂缝已发展成为制约城市建设和经济发展的难题。为了减小地裂缝对建筑物的灾害,避让措施作为一种强制性的规定被写入了规范,并且一直沿用至今。倘若西安严格实行空间避让原则无疑是远离了地裂缝活动所带来的危害,减少了在地裂缝地区建设工程的风险,但随着城市的不断发展,城市的土地也在不断的升值,一些建筑物不得不跨越地裂缝建设,不利用地裂缝场地将造成土地资源的浪费,使城市规划和建设受到限制。综上所述,亟需探究跨越地裂缝建筑物在地裂缝活动时的位移变化和内力变化,寻求跨越地裂缝建筑物在地震作用下的动力反应规律,从而为在地裂缝灾害较严重的城市中充分利用土地资源提供依据。本文在前人对地裂缝研究现状总结的基础上,现场调研了地裂缝灾害,参考某实际跨地裂缝建筑物,分析了一个跨越西安f4地裂缝的混凝土框架结构,运用ABAQUS有限元软件建立了地裂缝场地土和上部结构模型,并根据不同的工况设置结构跨越地裂缝的不同位置。一方面通过在上盘施加初始位移的方式来探讨上部结构在正常使用阶段由于不均匀沉降对上部结构造成的影响;另一方面通过在土体底部输入不同的地震动来对跨地裂缝结构进行弹塑性时程分析。通过不同工况下的弹塑性层间位移、顶层加速度、层间剪力以及其他内力变化情况,较为清晰地揭示出跨越地裂缝的建筑物在不均匀沉降和地震作用下的工作特性,找出了结构跨越地裂缝最不利位置,为更深入研究地裂缝和地震共同作用对上部结构的损伤机理和灾害防治措施提供参考。
[Abstract]:Since the 1950s, the ground fissures in Xi'an have become a difficult problem restricting urban construction and economic development. In order to reduce the damage to buildings caused by ground fissures, the measures of avoidance have been written into the code as a mandatory regulation, and have been used up to now. If Xi'an strictly implements the principle of avoiding space, it is undoubtedly far away from the harm caused by ground fissures and reduces the risk of construction projects in the area of ground fissures. However, with the continuous development of the city, the urban land is also continuously appreciating. Some buildings have to cross the ground fissure construction. Not using the ground fissure site will lead to the waste of land resources and limit the urban planning and construction. To sum up, it is urgent to explore the displacement and internal force changes of buildings across ground fissures during ground fissures, and to find out the dynamic response law of buildings across ground fissures under earthquake action. Therefore, it provides the basis for making full use of land resources in cities with serious ground fissures. On the basis of summarizing the present situation of research on ground fissures, this paper investigates the ground fissures on the spot, and analyses a concrete frame structure that spans f4 ground cracks in Xi'an, referring to the actual building of ground fissures. The soil and superstructure models of ground fissures are established by using ABAQUS finite element software, and different positions of structures crossing ground cracks are set up according to different working conditions. On the one hand, by applying initial displacement to the upper wall, the influence of uneven settlement on the superstructure in normal service stage is discussed. On the other hand, the elastic-plastic time-history analysis of the cross-ground crack structure is carried out by the input of different ground motion at the bottom of the soil. Through the changes of elastic-plastic interstory displacement, top acceleration, interstory shear force and other internal forces under different working conditions, the working characteristics of buildings crossing the ground cracks under the action of uneven settlement and earthquake are clearly revealed. The most disadvantageous position of structure crossing ground fissure is found out, which provides a reference for further study on the damage mechanism and disaster prevention measures of superstructure caused by the joint action of ground crack and earthquake.
【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】：TU375.4

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