【作者】 张扬；

【导师】 赵军；

【作者基本信息】 郑州大学 ， 结构工程， 2013， 硕士

【摘要】 钢筋混凝土剪力墙结构以其良好的承载能力和抗震性能被广泛应用于高层建筑。联肢剪力墙作为剪力墙结构的一大分支,以连梁作为墙肢之间的传力纽带,在地震作用以及风荷载的水平作用下,具有良好的抗侧变形能力。为了保证结构具有足够的侧向刚度以满足建筑使用功能的要求,高层建筑联肢剪力墙结构中经常使用跨高比较小的连梁。已有试验研究及地震灾害表明,普通钢筋混凝土的小跨高比连梁往往出现剪切型破坏形态,导致联肢剪力墙变成两片独立的墙肢,从而极大的降低了联肢剪力墙的抗震性能。钢纤维混凝土以其卓越的延性特质及耗能性能得到了普遍认可,目前已广泛应用于道路、桥梁、工业民用建筑等行业。已有试验结论表明,分别在连梁和剪力墙中加入钢纤维混凝土,可有效的提高构件的整体刚度、延性和耗能能力,改善构件的承载力和抗裂性能。本文通过对1片钢筋混凝土双肢剪力墙和2片不同钢纤维体积率的钢筋钢纤维混凝土双肢剪力墙进行低周反复加载试验,研究了钢纤维的加入对钢筋混凝土双肢剪力墙的承载力以及耗能能力的影响。主要研究内容如下：(1)设计了1片钢筋混凝土双肢剪力墙和2片钢筋钢纤维混凝土双肢剪力墙,并根据试件的尺寸以及受力情况设计制作了相应的试验装置。(2)对3个构件进行低周反复加载,研究了加载过程中连梁以及墙体的裂缝发展形态和分布。试验结果表明,钢纤维的加入对构件裂缝的分布和发展均产生明显的影响,减小了裂缝的宽度,对剪力墙的抗震性能影响比较显著。(3)分析了不同钢纤维体积率对双肢剪力墙的承载力、延性、刚度以及耗能能力的影响。通过试验结果分析表明,普通混凝土双肢剪力墙中加入钢纤维,可提高构件整体的承载力、延性以及耗能能力,并且在一定程度上延缓了双肢剪力墙整体的刚度退化。更多还原

【Abstract】 With excellent carrying capacity and seismic behavior, reinforced concrete shear wall structure is widely used in high-rise buildings. Coupled shear wall structure, a big embranchment of shear wall structure with coupling beams as the link of wall legs, have excellent lateral resisting ability under the earthquake action and the wind load. In high-rise building, in order to guarantee enough lateral stiffness or meet the functional requirements of the building, it often use coupling beam with low span-depth ratio. Existing experimental studies and earthquake disaster show, common reinforcement coupling beam with low span-depth ratio occurs generally shear destruction, thus turn the coupled shear wall into unattached walls and reduce stiffness of the structure extremely.Steel fiber concrete has got social recognition by its excellent property of ductility and the property of energy absorption and dissipation, and has been widely used in transportation, bridge, and civil engineering. Existing experimental studies show that the steel fiber in the coupling beams and shear walls limit the development of cracks and improve the seismic performance of the structure.In this paper, three coupled shear walls with different ratio of steel fiber have been tested by low cycle reverse. In order to study the seismic performance of coupled shear walls with steel fiber, this paper mainly completed the following job:Three coupled shear walls with different ratio of steel fiber were produced. Experimental unit was designed to match the size of the test pieces and fulfills the actual situation,The horizontal cyclic loading test, distribution and development of concrete crack were recorded in detail, was taken on three coupled shear walls with0.1axial compression ratio. The result showed that steel fiber caused obvious influence on distribution and development of cracks, and a notable one to the earthquake resistant behavior to the structure. The result of the different steel fiber ratio in the coupled shear walls on the bearing capacity, ductility and the ability of seismic energy dissipation was analyse deeply. And it showed that the bearing capacity, ductility, behavior of dissipation seismic energy and the anti-crack performance of the coupled shear walls was generally improved with the concrete reinforced by steel fibers, the stiffness degeneration was also reduced at a certain degree.更多还原