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规范《超限高层建筑工程抗震设防专项审查技术要点》规定框架-核心筒结构中框架部分按刚度计算承担的楼层地震剪力最大值不宜小于基底总剪力的10%,而实际工程受建筑布置等因素的限制有时难以满足,工程界对此颇有争议.为探讨其合理性,设计了5个钢筋混凝土框架-核心筒结构,主要的变化参数为框架刚度、框架强度和连梁的形式.利用PERFORM-3D软件进行了弹性反应谱分析和小震、中震和大震下的动力时程分析,考察了各个结构的响应规律.分析表明:当框架部分按刚度计算承担的剪力最大值小于基底总剪力的10%时,增大框架刚度的做法不经济,结构的抗震性能反而更差;增大框架强度的做法减小了框架梁的损伤,改善了结构的抗震性能,但没有形成有效的“强柱弱梁”机制;采用宽连梁和可更换连梁都可以使核心筒自身具有双重抗震体系特征,连梁耗能能力的提高有效地保护了墙肢和外框架,结构的抗震性能得到了显著改善.
Specification “beyond the limit of high-rise building seismic special technical review points,” the provisions of the framework - the core tube structure of the frame part of the stiffness calculated according to the story of the maximum seismic shear force should not be less than 10% of the total base shear force, and the actual project by the building layout In order to explore its rationality, five RC frame-core tube structures are designed, and the main variation parameters are frame stiffness, frame strength and the form of connecting beam. The elastic response spectrum analysis and the dynamic time history analysis under small earthquake, medium earthquake and large earthquake were carried out by using PERFORM-3D software and the response rules of each structure were investigated. The analysis shows that when the maximum shear force Less than 10% of the total shear force of the foundation, increasing the rigidity of the frame is uneconomical, but the seismic performance of the structure is worse. Increasing the strength of the frame reduces the damage of the frame beam and improves the seismic performance of the structure. However, The formation of an effective “strong column weak beam ” mechanism; the use of wide beams and interchangeable beams can make the core cylinder itself has a double seismic system features, even the beam energy capacity Effective protection of the pier and the outer frame, the seismic performance has been significantly improved.