预制混凝土框架梁柱自复位混合接头抗震性能研究

发布时间：2018-01-04 17:04

本文关键词：预制混凝土框架梁柱自复位混合接头抗震性能研究　出处：《兰州理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：传统的钢筋混凝土结构抗震设计主要是依靠结构构件自身的刚度、强度以及延性来抵抗地震作用,使结构满足“小震不坏、中震可修、大震不倒”的抗震防目标。但往往由于地震的不确定性与复杂性,致使建筑结构遭遇比设防烈度更大的地震作用,以致结构构件出现严重破损。此外,建筑结构遭受设防烈度的地震作用虽没有倒塌,但有部分构件因其破坏位置的关键性和破坏的严重性难以加固修复。本文在对国内外有关自复位结构体系的设计规程以及自复位体系的理论与试验研究等方面进展总结的基础上,主要对一种无阻尼的预制混凝土框架梁柱自复位混合接头(框架梁柱之间仅采用无粘结预应力钢绞线拼接)进行了抗震性能分析。采用ABAQUS有限元软件建立了6个预制混凝土框架梁柱自复位混合接头有限元模型,首先施加单调载荷对节点模型的承载力进行了参数分析,主要考察初始预应力、梁端配筋率及配箍率和钢绞线布置对节点承载力的影响；进而选取合适参数建立若干模型,对其施加往复载荷,考察初始预应力、钢绞线布置和加设消能钢筋对节点自复位性能以及耗能性能的影响。有限元模拟分析结果表明：该类接头具有与整浇式节点相当的初始刚度和承载力,且在结构发生一定的位移后,结构具有良好的自复位性能,但该类节点耗能性能比较差；转角达到4%时,框架柱与框架梁大部分均处于弹性状态。
[Abstract]:The traditional seismic design of reinforced concrete structures mainly depends on the stiffness, strength and ductility of the structural members to resist the earthquake action, so that the structure can be satisfied with "small earthquake is not bad, moderate earthquake can be repaired." However, because of the uncertainty and complexity of earthquake, the building structure is subjected to earthquake action with greater intensity than fortification, resulting in serious damage of structural members. Although the earthquake action of the fortified intensity of the building structure has not collapsed, some of the components are difficult to be strengthened and repaired because of the critical damage location and the severity of the damage. This paper summarizes the design rules of the self-reset structural system and the theoretical and experimental research of the self-reset system at home and abroad. A kind of undamped prefabricated concrete frame Liang Zhu self-reset hybrid joint is mainly used (only unbonded prestressed steel strands are used between the frame Liang Zhu). The seismic behavior analysis was carried out. Six finite element models of Liang Zhu self-reset hybrid joint of precast concrete frame were established by using ABAQUS finite element software. First, the bearing capacity of the joint model is analyzed by monotone load, and the effects of initial prestress, reinforcement ratio at the end of beam, hoop ratio and steel strand arrangement on the bearing capacity of the joint are investigated. Then the appropriate parameters are selected to establish some models, and the reciprocating load is applied to investigate the initial prestress. The effect of steel strand arrangement and energy dissipation bar on the self-reset performance and energy dissipation performance of the joints. The finite element simulation results show that the joints have the same initial stiffness and bearing capacity as the cast-in-place joints. After a certain displacement of the structure, the structure has good self-reset performance, but the energy dissipation performance of this kind of joints is relatively poor. When the rotation angle reaches 4, most of the frame columns and beams are in elastic state.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11;TU375

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