钢筋混凝土自复位框架结构抗震性能研究

发布时间：2018-07-14 21:38

【摘要】：自复位结构是一种利用后张预应力筋和节点耗能装置来组装预制构件的一种新型结构形式,作为一种特别处理的装配式结构,钢筋混凝土自复位结构具有施工简单、抗震性能好、残余变形小、震后易修复等特点。虽然在国内尚处于理论研究阶段,但在美国和新西兰等国家已经有相关规范出台,并有了工程应用。研究对象是钢筋混凝土自复位混凝土框架结构,研究内容主要分为三个方面。首先,通过对钢筋混凝土自复位梁进行试验研究,研究自复位梁的内力重分布及其竖向荷载作用下的承载力;利用ABAQUS有限元软件对钢筋混凝土自复位梁进行有限元分析,研究影响自复位梁内力重分布和承载力的因素。其次,对钢筋混凝土自复位节点在水平往复荷载作用下进行有限元研究,分析节点耗能能力及水平承载力。最后,通过对一榀框架在地震作用下的时程分析,研究自复位框架在不同轴压比、不同地震强度下的破坏形态,比较结构破坏时的层间位移角。研究表明,在梁柱结合面配筋适当的情况下,钢筋混凝土自复梁与传统现浇连续梁具有相同水平的竖向承载力,自复位梁节点具有良好的延性。自复位梁节点塑性的发展主要受特设钢筋影响;提高特设钢筋弯矩贡献比能够有效地改善节点耗能能力;自复位结构具有良好的变形恢复能力。在地震作用下,自复位结构的弹性及弹塑性层间位移限值均比传统现浇结构要大。
[Abstract]:Self-reset structure is a new type of structure which uses post-tensioned tendons and joint energy dissipation devices to assemble prefabricated members. As a specially treated prefabricated structure, reinforced concrete self-reset structure has simple construction. Good seismic performance, small residual deformation, easy to repair after the earthquake and so on. Although it is still in the stage of theoretical research in our country, it has been issued in some countries such as the United States and New Zealand, and has been applied in engineering. The research object is reinforced concrete self-reset concrete frame structure, which is mainly divided into three aspects. First of all, the internal force redistribution and the bearing capacity under vertical load of the self-reset RC beam are studied through the experimental research on the self-reset RC beam, and the finite element analysis of the self-reset RC beam is carried out by using Abaqus finite element software. The factors influencing the internal force redistribution and bearing capacity of the self-reset beam are studied. Secondly, the finite element analysis of reinforced concrete self-reset joints under horizontal reciprocating load is carried out to analyze the energy dissipation capacity and horizontal bearing capacity of the joints. Finally, through the time-history analysis of a frame subjected to earthquake, the failure patterns of self-reset frame under different axial compression ratios and different earthquake intensities are studied, and the interstory displacement angles are compared. The results show that the reinforced concrete self-composite beam has the same vertical bearing capacity as the traditional cast-in-place continuous beam, and the self-reset joint has good ductility. The plastic development of self-reset beam joints is mainly affected by special reinforcement; improving the contribution ratio of special reinforcement moment can effectively improve the energy dissipation capacity of the joints; and the self-reset structure has good deformation recovery ability. The elastic and elastic-plastic displacements of the self-reset structures are larger than those of the traditional cast-in-place structures under earthquake.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU375.4

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