【作者】 郭栋；

【导师】 史庆轩；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2011， 硕士

【摘要】 在高层及超高层建筑结构中,钢筋混凝土核心筒常被用作主要的抗侧力构件。其抗震性能的好坏直接影响着高层建筑结构的受力性能。本文围绕混凝土核心筒的抗震性能,通过试验研究、理论分析和数值模拟等方法,对核心筒在水平荷载下的受力性能、地震破坏机理、极限承载力计算方法和基于宏观模型的非线性反分析方法进行研究。主要包括以下几方面的内容:通过4个模型试验,研究不同工况下混凝土核心筒在低周反复荷载作用下的破坏形态、滞回特性、耗能性能、承载能力、变形性能以及延性性能等。主要分析了在相同轴压比作用下,核心筒高宽比、连梁尺寸和加载角度对钢筋混凝土核心筒抗震性能的影响。结果表明高宽比增加,核心筒极限承载力降低,延性系数未必提高;连梁跨高比降低,核心筒极限承载力提高,但变形能力较差;加载角度减小,极限承载力提高,结构变形能力下降不明显。在已有的剪力墙极限承载力计算原理的基础上,总结出混凝土核心筒的极限承载力计算方法,并结合试验,计算了3个核心筒试件的极限承载力,理论值与试验值较为吻合,说明这套计算理论的可靠性;分析计算了连梁的抵抗弯矩,通过与核心筒整体抗弯承载力的对比,说明了连梁在核心筒抗弯能力中的重要作用。应用三维结构非线性分析与性能评估软件PERFORM-3D,对钢筋混凝土核心筒进行数值模拟,以纤维模型为基础,研究核心筒在单调荷载作用下的受力性能;考虑不同影响因素,如轴压比、连梁配筋率、加载角度及边缘约束构件配筋率等对核心筒抗震性能的影响。更多还原

【Abstract】 In high-rise and super high-rise building structure, the reinforced concrete core wall is often used as a main component of anti-force measurement. It`s Seismic performance directly impact the Mechanical performance of high-rise building structure. In this paper, Around the seismic behavior of concrete core wall, Some aspect are studied when horizontal loading is applied, such as the Mechanical performance, Mechanism of earthquake damage, Calculated method of ultimate bearing capacity and Nonlinear analysis method based on Macroscopic model. In this process, three methods are used, it are experimental research, theoretical analysis and numerical simulation. The main content include following aspects:Through four model test, when cyclic loading is applied, some aspects for concrete core wall are studied such as failure modes, hysteretic behavior, energy dissipation, carrying capacity, deformation and ductility. Mainly analyzes the effect of aspect ratio, coupling beams size and load angle to seismic performance of reinforced concrete core wall. The results show that when aspect ratio`s increased, the core wall`s ultimate strength is reduced, ductility factor may not increase; when cross-height ratio is reduced, bearing capacity is increased, but deformation capacity is reduced; when load angle is decreased, the ultimate bearing capacity is increased, but no significant decline in the deformation capacity.Based on the calculation principle of the shear wall ultimate strength, Summed up the method of the core wall ultimate bearing capacity. Calculate the ultimate bearing capacity of the test model in this formula. By comparing the theoretical values agree well with the experimental value, indicating the reliability of this computational theory. Calculate and analysis the resist bending of coupling beams, indicating its important role in the resist bending ability of core wall.In this paper, the reasonable nonlinear macro model of concrete core wall will established, based on the PERFORM-3D-Nonlinear Analysis and Performance Assessment for 3D Structure software. Analysis effect on the seismic performance of the core walls, Such as axial compression ratio, reinforcement ratio of coupling beams,load angle and Boundary element reinforcement ratio.更多还原