预制叠合板式混凝土剪力墙纵筋连接及其抗震性能研究

发布时间：2018-02-13 01:56

本文关键词： 搭接连接约束砼锚钢筋连接预制叠合板式混凝土剪力墙拟静力试验抗震性能分析　出处：《哈尔滨工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：为全面了解预制叠合板式混凝土剪力墙抗震性能,同时研究新型纵筋连接方式可靠性,提高钢筋连接薄弱位置的强度和增强混凝土界面连接,本文首先提出了以约束浆锚为基础的适用于叠合板式剪力墙纵筋的连接方式--约束砼锚钢筋搭接方式,并进行了该搭接方式受力性能试验研究;设计制作约束砼锚钢筋搭接形式下预制叠合板式混凝土剪力墙试件,进行水平往复荷载下拟静力试验研究,并与现浇剪力墙性能进行对比;基于试验及分析结果,提出预制叠合板式剪力墙水平承载力计算方法,并进行验证。本文具体研究内容如下:1.进行了12个试件的单向拉伸钢筋粘结滑移试验和24个试件的约束砼锚钢筋搭接试验,获得了不同配箍参数下钢筋与混凝土的极限粘结强度和钢筋搭接性能,试验结果表明:配置螺旋箍筋提高了极限粘结强度,配箍率和箍筋环径线性影响极限粘结强度;大环径箍筋约束下的搭接性能好于小环径箍筋约束。2.根据约束砼锚钢筋搭接试验结果,提出钢筋搭接受力模型,该模型考虑了混凝土开裂前后螺旋箍筋受力状态的不同,给出各阶段参数理论关系式,通过将理论值和试验值对比分析,提出了适于实际工程设计与施工的的配箍率计算公式和实用表格以及构造建议。3.通过3个预制叠合板式混凝土剪力墙试件和3个现浇混凝土剪力墙试件的拟静力试验,获得了预制叠合板式混凝土剪力墙的破坏过程与破坏模式、受力特点、整体刚度和延性、耗能能力、约束砼锚搭接纵筋应变过程等结果,并与现浇剪力墙进行了对比分析。试验表明:预制剪力墙的受力性能及破坏模式与现浇墙体相近,其承载力和刚度略低于现浇混凝土墙体,但延性和耗能能力优于现浇墙体;预制墙体纵筋应变大于现浇墙体同一位置纵筋应变,说明约束砼锚钢筋搭接方式具有良好的受力性能,能够满足抗震需求。4.结合现行规范中现浇剪力墙设计计算方法和预制叠合板式剪力墙实际受力特点,提出受压区混凝土抗压强度按箍筋约束区和非约束区不同取值的设计思路,给出适于预制叠合板式混凝土剪力墙水平承载力计算方法;基于搭接试验与抗震试验结果,针对采用约束砼锚钢筋搭接的预制叠合板式混凝土剪力墙,提出了具体的工程设计构造建议。
[Abstract]:In order to fully understand the seismic behavior of prefabricated concrete shear wall, and to study the reliability of a new type of longitudinal steel bar connection, the strength of the weak position of steel bar connection and the strengthening of concrete interface connection are improved. In this paper, first of all, based on the restrained grouted anchor, a kind of connection mode, which is suitable for the longitudinal reinforcement of the laminated slab shear wall, is put forward, and the experimental study on the mechanical performance of the lapped concrete anchor is carried out. Design and manufacture prefabricated concrete shear wall specimens with confined concrete anchors and steel bars under horizontal reciprocating load, and compare with cast-in-place shear wall performance, based on the test and analysis results, The calculation method of horizontal bearing capacity of prefabricated laminated plate shear wall is presented and verified. The concrete contents of this paper are as follows: 1. In this paper, 12 specimens of uniaxial tensile bar bond-slip test and 24 specimens of confined concrete anchor bar lap test are carried out. The ultimate bond strength and lapping behavior of steel bar and concrete under different hoop parameters are obtained. The experimental results show that the ultimate bond strength is increased by the allocation of spiral stirrups, and the ultimate bond strength is affected linearly by the ratio of hoop and the diameter of stirrups. The lapping behavior of large ring diameter stirrups is better than that of small ring diameter stirrups. 2. According to the experimental results, a reinforcement lap acceptance model is proposed, which takes into account the different stress states of spiral stirrups before and after the cracking of concrete. The theoretical expressions of the parameters in each stage are given, and the theoretical values and the experimental values are compared and analyzed through the comparison and analysis of the theoretical values and the experimental values. The calculation formula and practical form of hoop ratio suitable for practical engineering design and construction are put forward, and construction suggestion .3.Through the quasi-static test of three prefabricated composite slab concrete shear wall specimens and three cast-in-place concrete shear wall specimens, The failure process and failure mode, stress characteristics, overall stiffness and ductility, energy dissipation capacity, strain process of restrained concrete anchor and lapped longitudinal reinforcement of prefabricated slab concrete shear wall are obtained. The experimental results show that the mechanical properties and failure mode of prefabricated shear walls are similar to that of cast-in-place walls, and their bearing capacity and stiffness are slightly lower than that of cast-in-place concrete walls, but the ductility and energy dissipation capacity are better than cast-in-place walls. The strain of longitudinal reinforcement in precast wall is greater than that in the same position of cast-in-place wall, which shows that the lapping mode of restrained concrete anchor bar has good mechanical performance. According to the design and calculation method of cast-in-place shear wall in current code and the actual stress characteristics of prefabricated laminated slab shear wall, the design idea of concrete compressive strength in compression zone according to different values of stirrups confined zone and unconfined zone is put forward. The calculation method of horizontal bearing capacity of precast composite slab concrete shear wall is presented, and based on the results of lap test and seismic test, the prefabricated composite slab concrete shear wall with confined concrete anchor and reinforcement is used to calculate the horizontal bearing capacity of concrete shear wall. The concrete construction suggestion of engineering design is put forward.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.2;TU352.11

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