隔震结构的柔性限位防护研究

发布时间：2018-07-07 16:09

  本文选题：隔震结构 + 橡胶挡块　； 参考：《西安理工大学》2017年硕士论文

【摘要】：隔震技术是目前减控震技术中最为成熟的,广泛应用于房屋、桥梁、渡槽等建、构筑物中。隔震结构在地震作用时上部结构反应很小,但隔震层变形较大,当隔震支座水平位移达到极限变形时,结构可能会整体倾覆。需对隔震层进行限位保护,软碰撞限位保护预期可取得良好的效果。本文对软碰撞限位保护研究做了以下几方面工作:(1)设计并制作了一种“山”型橡胶限位缓冲器,对其进行受压试验。取得了试件在顶部荷载作用下的荷载—位移曲线,得到了试件在变形范围内能够产生的最大反力和刚度。(2)采用ABAQUS有限元软件分析了“山”型橡胶防护挡块在荷载作用下的受力性能,考虑了材料非线性、几何非线性和接触非线性,从理论计算角度进一步了解其在荷载作用下的变形全过程。(3)用SAP2000软件建立一个基础隔震的混凝土框架结构,模拟隔震结构与“山”型橡胶限位缓冲器之间的碰撞,分析了隔震层位移、层间位移角、楼层加速度、层间剪力及限位器变形等数据。对“山”型橡胶防护挡块的性能测试结果表明该限位器具有完全弹性、变刚度(前期刚度小、后期刚度大)、一定的耗能能力等特点,符合软碰撞保护限位器的要求。ABAQUS有限元分析表明超弹性Mooney-Rivlin本构模型能够较好地模拟小变形下(≤150%)的橡胶材料变形,有限元分析与试验结果符合良好,为估算“山”型橡胶防护挡块的力学参数提供参考。隔震结构软碰撞限位保护分析结果表明,结构与限位器发生碰撞时,限位器设置层受到的扰动是不可避免的,但对上部结构反应影响不大。因此,限位装置对防止大震下隔震结构倾覆破坏是非常有效的。
[Abstract]:Isolation technology is the most mature technology of earthquake mitigation and control, widely used in buildings, bridges, aqueducts and other structures. The response of the isolated structure to the earthquake is very small, but the deformation of the isolation layer is large. When the horizontal displacement of the isolation support reaches the limit deformation, the structure may overturn as a whole. The limit protection of the isolation layer is needed, and the soft impact limit protection is expected to achieve good results. In this paper, the research of soft impact limit protection has been done in the following aspects: (1) A kind of "mountain" rubber limit buffer is designed and manufactured, and the pressure test is carried out on it. The load-displacement curve of the specimen under the action of the top load is obtained. The maximum reaction force and stiffness of the specimen in the deformation range are obtained. (2) using Abaqus finite element software, the mechanical behavior of the "mountain" rubber shield under load is analyzed, and the material nonlinearity is considered. Geometric nonlinearity and contact nonlinearity, the whole process of deformation under load is further understood from the angle of theoretical calculation. (3) A foundation isolated concrete frame structure is built with SAP2000 software. The collision between the isolated structure and the "mountain" rubber limiter is simulated. The data of the isolation layer displacement, interstory displacement angle, floor acceleration, interstory shear force and the deformation of the limiter are analyzed. The test results of the performance of the "Shan" rubber shield show that the limiter has the characteristics of full elasticity, variable stiffness (small stiffness in the early stage and large stiffness in the later stage), and certain energy dissipation capacity. The finite element analysis of Abaqus shows that the superelastic Mooney-Rivlin constitutive model can well simulate the deformation of rubber materials under small deformation (鈮，

本文编号：2105499