底部现浇预制装配剪力墙抗震性能试验研究

发布时间：2018-08-11 10:20

【摘要】：住宅产业化是我国住宅建设的发展方向,同时预制装配整体式剪力墙结构也是适合我国住宅产业化的一种建筑结构体系。目前,装配式混凝土剪力墙一般按楼层分层预制,通过一定的连接构造将上、下层预制剪力墙板连成整体。剪力墙墙肢两端的边缘构件是其重要的受力和变形部位,边缘构件提供剪力墙主要的承载力和延性。因此,解决装配式剪力墙边缘构件的连接可靠性问题是实现装配式剪力墙整体性的关键。笔者在阅读大量相关文献的基础上,为进一步简化预制装配剪力墙的水平拼接方法、提高效率和降低成本,同时为提高拼缝处的刚度和承载能力,针对现有一字形剪力墙“贯通”形拼缝连接方式进行改进,提出了一种剪力墙底部左右两侧各预留高600mm、宽500mm的后浇区,其他部分预制,通过预埋在上部墙体内的通长浇筑孔浇筑混凝土至后浇区并振捣密实,形成一种“凹”字形拼缝连接方法,主要完成工作和研究结论如下所述：(1)设计并制作了2片现浇,4片底部现浇预制装配式一字形剪力墙构件,在0.1和0.2轴压比状态下分别对1片现浇、2片预制试件进行低周反复荷载试验。试验结果表明,现浇墙体的破坏集中在墙肢根部,预制墙体的破坏不仅在墙肢根部,同时底部后浇区上拼缝处混凝土表面有剥落现象,构件的延性随轴压比的升高而降低,构件的屈服荷载、极限承载能力随着轴压比的升高而增加。(2)通过观察同一轴压比状态下的预制试件与现浇试件的裂缝开展、破坏过程及破坏形态,以及从滞回曲线、骨架曲线、刚度、承载力、延性以及耗能能力等方面对其抗震性能进行综合评价,试验结果表明,预制试件滞回曲线呈现丰满的反“S”形,延性系数达到抗震规范要求,具有良好的抗震耗能能力,与现浇试件相比相差不大。(3)利用ABAQUS对在不同轴压比状态下的现浇试件、底部现浇预制装配剪力墙进行单调递增水平力加载模拟分析,通过考虑混凝土加载过程中的损伤,直观地再现试验过程中混凝土塑性铰的发展情况、钢筋的应力应变关系及荷载位移情况,并同试验情况进行对比分析,结果表明有限元分析结果与试验结果表现接近。通过上述工作可知,预制装配式剪力墙水平拼缝转变为“凹”字形拼缝,不仅提高了部分水平拼缝的位置、加强了连接性能,同时简化了操作,节约了成本,具有新颖性。
[Abstract]:Housing industrialization is the development direction of housing construction in our country. At the same time prefabricated and assembled integral shear wall structure is also a kind of building structure system suitable for housing industrialization in our country. At present, prefabricated concrete shear walls are generally prefabricated by layers, and the upper and lower prefabricated shear wall panels are connected as a whole through a certain connection structure. The edge member at both ends of the shear wall limb is an important force and deformation position, and the edge member provides the main bearing capacity and ductility of the shear wall. Therefore, the key to realize the integrity of assembled shear wall is to solve the problem of reliability of connection between the edge components of assembled shear wall. On the basis of reading a large number of related documents, in order to further simplify the horizontal splicing method of prefabricated shear wall, improve the efficiency and reduce the cost, at the same time, in order to improve the stiffness and bearing capacity of the joint, In view of the improvement of the existing "through" shape joint connection of a zigzag shear wall, a kind of post-pouring area with a height of 600mm and a wide 500mm on the left and right sides of the bottom and left side of the shear wall is put forward, and the other parts are prefabricated. A "concave" zigzag joint connection method is formed by pouring concrete through long pouring holes in the upper wall into the post-pouring area and compacting with vibration. The main works and conclusions are as follows: (1) two cast-in-place four cast-in-place prefabricated one-zigzag shear wall members are designed and manufactured. Under the condition of 0.1 and 0.2 axial compression ratio, the low cycle repeated load tests were carried out on one cast-in-situ and two prefabricated specimens, respectively. The test results show that the damage of cast-in-place wall is concentrated on the root of the wall limb, and the damage of the precast wall is not only at the root of the wall, but also on the concrete surface of the joint at the bottom of the post-pouring area. The ductility of the member decreases with the increase of axial compression ratio. The yield load and ultimate bearing capacity of members increase with the increase of axial compression ratio. (2) by observing the crack development, failure process and failure form, hysteretic curve and skeleton curve of prefabricated specimens and cast-in-situ specimens under the same axial compression ratio, The stiffness, bearing capacity, ductility and energy dissipation capacity are comprehensively evaluated. The experimental results show that the hysteretic curve of the prefabricated specimen presents a full "S" shape, and the ductility coefficient reaches the requirements of the seismic code. It has good seismic energy dissipation ability, and has little difference compared with cast-in-place specimens. (3) using ABAQUS to simulate and analyze monotonously increasing horizontal force loading of cast-in-place specimens under different axial compression ratios, the bottom cast-in-place prefabricated shear walls are loaded with increasing horizontal forces. By considering the damage of concrete during loading, the development of concrete plastic hinge, the stress-strain relationship and load-displacement of steel bar are reproduced intuitively and compared with the experimental results. The results show that the finite element analysis results are close to the experimental results. Through the above work, it can be seen that the horizontal joint of prefabricated shear wall is transformed into "concave" zigzag joint, which not only improves the position of some horizontal joints, strengthens the connection performance, but also simplifies the operation, saves the cost and has the novelty.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.2;TU352.11

【参考文献】