坡地建筑结构设计的关键问题与应对方法  

Key problems and countermeasures in design for building structure on slope

作　　者：薛晓娟 江毅 林乐斌 易伟文 XUE Xiaojuan;JIANG Yi;LIN Lebin;YI Weiwen(South China University of Technology Architectural Design Research Institute Co.,Ltd.,Guangzhou 510641,China)

机构地区：[1]华南理工大学建筑设计研究院有限公司,广州510641

出　　处：《建筑结构》2021年第13期59-64,14,共7页Building Structure

摘　　要：由于坡地建筑建造于山地之上,其风荷载取值和地震作用均较平地建筑有一定的放大效应。同时由于坡地建筑存在底部不等高嵌固的特点,其结构设计指标往往难以满足现行规范设计要求。另外,山坡地区工程地质情况复杂,地势起伏变化,持力层埋深深浅不一,基础设计难度较大。针对这些关键问题,以某实际项目为依托,提出了一些应对方法。其中,针对坡地建筑扭转位移比严重超限问题提出了加长短柱、增大长柱截面刚度、设置连系梁、设置防震缝、短柱设计为摇摆柱等方法,并对其进行了详细的对比分析,采用Perform-3D进行罕遇地震下的静力弹塑性分析。分析结果表明,扭转位移比越大,地震剪力越容易集中在角部短柱上,短柱越容易破坏,结构整体抗震性能越差,因此改善扭转位移比是必要的。Because the sloping building is built on the mountain,its wind load value and seismic action have a certain amplification effect than that of a flat building.At the same time,due to the unequal height fixed of the bottom of the sloping building,its structural design indicators are often difficult to meet the design requirements of the current specifications.In addition,the engineering geology of the hillside area is complex,the terrain is undulating,the depth of the supporting layer is different,and the foundation design is difficult.In response to these key issues,based on an actual project,some countermeasures were proposed.Among them,in view of the serious over-limit problem of the torsional displacement ratio of sloping building,methods such as lengthening the short column,increasing the section stiffness of the long column,setting the connecting beam,setting the seismic joint,and designing the short column as a swing column,etc.were proposed.And a detailed comparative analysis was carried out,Perform-3D was used to carry out static elastoplastic analysis under rare earthquakes.The analysis results show that the larger the torsional displacement ratio,the easier the seismic shear force is concentrated on the corner short columns,the easier the short columns are to break,and the worse the overall seismic performance of the structure.Therefore,it is necessary to improve the torsional displacement ratio.

关 键 词：坡地建筑 不等高嵌固 扭转位移比 基础设计 

分 类 号：TU398.7[建筑科学—结构工程]