加强型水平拼接预制混凝土剪力墙抗震性能试验研究

发布时间：2018-02-21 23:46

本文关键词： 住宅产业化预制混凝土剪力墙抗剪试验抗震性能损伤因子　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：哈尔滨工业大学课题组自主开发了“约束浆锚钢筋搭接连接”和“钢筋环插筋连接”技术，分别解决了预制混凝土剪力墙的纵筋连接和水平钢筋连接问题，形成了以此为核心技术的预制装配式混凝土剪力墙结构体系。构件连接时预制结构中的关键点。预制墙片在结构中相互连接会形成水平拼接和竖向拼接。竖向连接容易满足承载力要求，而墙片水平拼接会直接影响结构整体刚度。因此需要对墙片水平拼接连接技术进行不断改进和完善。为加强水平拼接在往复剪力作用下的工作性能，本文设计制作了6类12个标准拼接试件进行往复荷载作用下的连接性能抗剪试验。通过对试件破坏状态、刚度、耗能、界面滑动和钢筋应变等的分析，发现增加界面剪切钢筋、改变剪切钢筋形式、加强拼缝内混凝土等措施相互结合可以有效提高界面抗剪承载力。结合标准试件连接抗剪性能试验，设计了3片加强型水平拼接的预制混凝土剪力墙和3片同尺寸同配筋的整浇墙。通过在水平拼接预制墙片竖缝处增加U形剪切钢筋和在拼缝内间隔放置X形钢筋架对水平拼接进行了加强。对两种墙片在低周往复水平荷载作用下的破坏形态、受力性能、滞回耗能能力和钢筋应变等进行了对比分析。分析结果表明，加强型水平拼接的预制混凝土剪力墙片与整浇墙片抗震性能相似，耗能能力相当，，且延性稍好。结合试验将拼缝破坏分为粘接、键槽破坏、摩阻三个阶段，并对后两个阶段的抗剪承载力进行了分析，得到了各阶段抗剪承载力计算公式。将理论公式计算结果与试验结果进行比较，确定公式可用于设计。最后利用ABAQUS对配置不同剪切钢筋的界面进行了有限元模拟，模拟结果进一步证明了理论计算的正确性。
[Abstract]:The project group of Harbin University of Technology has independently developed the technologies of "lapping connection of restrained grouting anchor reinforcement" and "ring insertion of steel bar", which solve the problems of longitudinal reinforcement connection and horizontal reinforcement connection of precast concrete shear wall, respectively. A prefabricated concrete shear wall structure system based on this core technology is formed. The key points in the precast structure when members are connected. The horizontal and vertical splicing of precast wall sheets are formed when the prefabricated wall pieces are connected to each other in the structure. The connection is easy to meet the bearing capacity requirements, The horizontal splicing of the wall piece will directly affect the overall stiffness of the structure, so it is necessary to improve and perfect the technology of the horizontal splicing of the wall sheet. In order to enhance the performance of horizontal splicing under the action of reciprocating shear force, this paper designs and manufactures six kinds of 12 standard splicing specimens for shear test under reciprocating load. Through the analysis of interface sliding and reinforcing bar strain, it is found that increasing the interfacial shear bar, changing the form of shear bar and strengthening the concrete in the joint can effectively improve the shear bearing capacity of the interface. Combined with standard test piece connection shear performance test, Three reinforced precast concrete shear walls with horizontal splicing and three monolithic cast-in-place walls with the same size and reinforcement were designed. By adding U-shaped shear bars to the vertical joints of the horizontal spliced precast walls and placing X-shaped reinforcement at intervals within the splicing joints. The horizontal splicing of the frame is strengthened. The failure patterns of two kinds of wall sheets under low cycle reciprocating horizontal load are studied. The mechanical properties, hysteretic energy dissipation capacity and strain of steel bar are compared and analyzed. The results show that the seismic behavior of prefabricated concrete shear wall with reinforced horizontal splicing is similar to that of cast-in-place wall, and the energy dissipation capacity is equivalent and the ductility is slightly better. Combined with the test, the joint failure is divided into three stages: bonding, keyway failure and friction, and the shear bearing capacity of the latter two stages is analyzed. The formulas for calculating the shear bearing capacity of each stage are obtained. The results of the theoretical formula are compared with the experimental results, and the formula can be used in the design. Finally, the finite element simulation of the interface with different shear bars is carried out by using ABAQUS. The simulation results further prove the correctness of the theoretical calculation.
【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】：2014
【分类号】：TU375;TU352.11

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