框架—核心筒结构楼层地震剪力调整方法的对比分析

发布时间：2018-03-19 18:02

本文选题：框筒结构　切入点：Perform3D　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：在框架-核心筒结构中，由于核心筒部分的刚度比框架部分的刚度大很多，框架部分小震弹性计算所得的剪力一般都较小，但因核心筒的弹性极限变形值比较小，在设防地震、罕遇地震作用下地震作用在核心筒和框架之间发生重分配，框架部分的地震剪力比小震时加大。因此，我国《高层建筑混凝土结构技术规程》（JGJ3-2010）和《高层建筑钢-混凝土混合结构设计规程》（CECS230:2008）对框架-核心筒中框架部分的最小地震剪力标准值的调整都作了相应的规定。现在国内外做了很多关于框架-核心筒的研究，但是未见对于上述两种框架地震剪力调整方法的对比，，因此本文通过框架-核心筒结构算例模型的分析，对不同的调整方法进行了对比分析。本文建立了型钢混凝土框架-钢筋混凝土核心筒结构和钢框架-钢筋混凝土核心筒结构的模型，分别用《高规》和《高混规》中给出的关于混合结构中框架-核心筒结构框架楼层地震剪力调整方法对结构进行调整，采用PERFORM3D软件对算例模型进行动力弹塑性分析和静力推覆分析，考察了结构在设防地震、罕遇地震下的抗震性能以及结构的失效模式，从而对两种调整方法的控制效果进行了对比分析。通过本文的研究，初步得出以下结论： ①按CECS230：2008方法设计的外框内力调整系数在上部楼层均较小，都在1.0附近，比JGJ3-2010方法小很多，在下部楼层调整系数较大，但比JGJ3-2010方法也要小。按CECS230：2008方法进行调整时，在结构下部由于轴力也要进行调整，考虑地震作用组合的轴压力比以前增大很多，框架柱尺寸相应增大，特别是高烈度区增大程度较大。 ②两种框架地震剪力调整方法都能够保证在设防地震、罕遇地震下框架部分的抗侧力能力，能够保证结构合理的失效模式，确保了框架部分的二道防线作用。两种调整方法设计的框架-核心筒结构在设防地震、罕遇地震下的整体抗震性能差异较小。
[Abstract]:In frame-core tube structure, because the stiffness of the core tube is much larger than that of the frame, the shear force obtained from the elastic calculation of the frame part is generally smaller, but because the elastic limit deformation value of the core tube is relatively small, the earthquake is protected against the earthquake. The seismic action is redistributed between the core tube and the frame under the rare earthquake, and the seismic shear force of the frame part is stronger than that of the small earthquake. The Technical Specification for concrete structures of High-rise buildings in China (JGJ3-2010) and the Code for the Design of Steel-Concrete mixed structures in High-rise buildings (CECS 230: 2008) have all made corresponding regulations on the adjustment of the minimum seismic shear standard value of the frame part in the frame-core tube. And now there's been a lot of research at home and abroad on the frame-core tube, But there is no comparison between the two seismic shear adjustment methods mentioned above, so this paper makes a comparative analysis of the different adjustment methods through the analysis of the frame-core tube structure example model. In this paper, the models of SRC frame-reinforced concrete core tube structure and steel frame-reinforced concrete core tube structure are established. The seismic shear adjustment method for frame floor of frame-core tube structure in hybrid structure is presented in "High gauge" and "High mixing gauge", respectively. The dynamic elastic-plastic analysis and static push-over analysis of the example model are carried out by using PERFORM3D software. The seismic behavior of the structure under earthquake prevention and rare earthquakes and the failure mode of the structure are investigated. Thus, the control effect of the two adjustment methods is compared and analyzed. Through the research of this paper, we draw the following conclusions:. 1 the internal force adjustment coefficient of outer frame designed according to CECS230:2008 method is smaller than that of JGJ3-2010 method in the upper floor, which is smaller than that of JGJ3-2010 method, but smaller than that of JGJ3-2010 method. When the adjustment is made by CECS230:2008 method, the adjustment coefficient of outer frame is smaller than that of JGJ3-2010 method. Due to the adjustment of axial force in the lower part of the structure, the axial pressure of seismic combination is much larger than before, and the size of frame column increases accordingly, especially in the high intensity region. 2. The two methods of frame seismic shear adjustment can guarantee the lateral force resistance of the frame part under earthquake fortification and rare earthquake, and can guarantee the reasonable failure mode of the structure. The frame-core tube structure designed by the two adjustment methods has little difference in overall seismic performance under seismic fortification and rare earthquake.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU973.31

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