TOD全框支剪力墙结构设计若干难点热点问题探讨  

Discussions on difficult and hot issues in design of TOD fully frame-supported shear wall structure

作　　者：姚永革 郑建东 严仕基 贺立荣 邱骏伟 YAO Yongge;ZHENG Jiandong;YAN Shiji;HE Lirong;QIU Junwei(Guangzhou Hanhua Architects+Engineers Co.,Ltd.,Guangzhou 510655,China)

机构地区：[1]广州瀚华建筑设计有限公司,广州510655

出　　处：《建筑结构》2020年第10期75-82,共8页Building Structure

摘　　要：根据对TOD全框支剪力墙结构设计的若干实践,提出该种结构体系的特点、难点和热点,包括楼层刚度比、受剪承载力比、柱与剪力墙的本质特征与角色变换、与"鸡腿式"结构的区别、框支柱顶屈服对结构安全的影响、车辆段先行设计做法等问题,并对难点热点问题通过推理分析、算例对比、工程实例验证等方法进行了深入探讨。建议采用拉弯或压弯承载力计算TOD全框支剪力墙结构的层间承载力比;《高层建筑混凝土结构技术规程》(JGJ 3-2010)附录E中的等效剪切刚度近似公式在某种情形下与实际存在较大偏差;从受力和变形本质特征的角度看,柱与墙常常发生角色变换,无论柱还是墙,其本身均可用杆单元或墙单元模拟,但需注意单元无几何尺寸方向对梁跨度引起的偏差;全框支剪力墙结构在结构形式、承载力和刚度突变的关系及产生原因、抗震能力等方面均不同于"鸡腿式"柔性底框结构;在强震作用下,框支柱顶端可允许先于转换梁屈服;建议以初步建筑方案整体建模计算的构件最大内力和配筋结果为基准,对可能影响范围的车辆段结构进行设计。According to the practice of TOD fully frame-supported shear wall structure design, the characteristics, difficulties and hot issues of this structural system were put forward, including floor stiffness ratio, shear bearing capacity ratio, the essential characteristics and role transformation of column and shear wall, the difference with "chicken leg" shaped structure, the influence of the top yield of the frame-supported column on structural safety, design method taking depot as priority, and the difficulties and hot issues were discussed through the methods of reasoning analysis, comparison of calculation examples and verification of engineering examples. It is suggested to calculate the story bearing capacity ratio of TOD fully frame-supported shear wall structure by tension bending or compression bending;the approximate formula of equivalent shear stiffness in Appendix E of Technical specification for concrete structures of tall building(JGJ 3-2010) has a large deviation from the actual situation in some cases;from the perspective of the essential characteristics of stress and deformation, "column" and "wall" often have role transformation, and both the "column" and "wall" can be simulated by single element or wall element, but it should be noted that the element does not have the deviation caused by the geometric dimension direction to the beam span;fully frame-supported shear wall structure is different from "chicken leg" shaped flexible bottom frame structure in structural form, bearing capacity, relationship between stiffness mutation, cause of occurrence, seismic capacity and other aspects;under strong earthquake, the top of frame column can be allowed to yield before the transfer beam;It is suggested that the maximum internal force and reinforcement of the components calculated by the overall modeling of the initial building scheme should be used as the benchmark to design the depot structure which may affect the scope.

关 键 词：“以公共交通为导向”的开发模式 全框支剪力墙结构 承载力比 剪切刚度比 墙柱受力变形本质 “鸡腿式”结构 柔性底框结构 车辆段先行设计做法 

分 类 号：TU318.2[建筑科学—结构工程] TU375