框架-核心筒结构框架承担最小剪力比例限制的合理性

发布时间：2018-05-13 04:00

本文选题：框架-核心筒结构 + 刚度　；参考：《同济大学学报(自然科学版)》2017年09期

【摘要】：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.
[Abstract]:Code < Technical essentials of Seismic fortification Special examination for Over-limit High-rise Building Engineering > it is stipulated that the maximum seismic shear strength of the frame part in the frame-core tube structure should not be less than 10% of the total shear force of the basement, but the actual value should not be less than that of the total shear force of the basement. It is sometimes difficult to satisfy the constraints of the project due to such factors as the layout of the building. This is controversial in the engineering community. In order to discuss its rationality, five reinforced concrete frame-core tube structures are designed. The main variation parameters are frame stiffness, frame strength and the form of connecting beam. The elastic response spectrum analysis and dynamic time history analysis of small earthquake, moderate earthquake and large earthquake are carried out by using PERFORM-3D software, and the response laws of each structure are investigated. The analysis shows that when the maximum shear force of the frame part is less than 10% of the total shear force of the base, it is not economical to increase the stiffness of the frame, and the seismic performance of the structure is worse. The method of increasing the frame strength reduces the damage of the frame beam and improves the seismic performance of the structure, but it does not form an effective mechanism of "strong column and weak beam". Both wide and replaceable beams can make the core tube have the characteristics of dual seismic system. The improvement of the energy dissipation capacity of the connecting beam can effectively protect the wall limb and the outer frame, and the seismic performance of the structure has been improved significantly.
【作者单位】：同济大学土木工程防灾国家重点试验室;同济大学结构工程与防灾研究所;同济大学建筑设计研究院(集团)有限公司;
【基金】：国家自然科学基金(51478354) 海南省重点研发计划(ZDYF2016151)
【分类号】：TU973.17;TU973.31

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