强震作用下超高层建筑施工全过程安全极限分析  

Safety Limit Analysis for the Whole Construction Process of a Super High-Rise Building Under Strong Earthquakes

作　　者：安道尧 AN Daoyao(China Railway Urban Construction Group Co.,Ltd.,Changsha 410000,China)

机构地区：[1]中铁城建集团有限公司,长沙410000

出　　处：《工业建筑》2022年第3期117-122,共6页Industrial Construction

摘　　要：超高层建筑施工期长,在结构整体刚度未完备时的整个施工过程中,结构在各种施工荷载和环境风、地震作用下的安全是施工期值得关注的关键问题之一。为了研究上述问题,采用数值模拟的方法,在结构整体刚度未完备时的不同阶段,分析了强震作用对施工过程的影响。以银川绿地中心超高层项目南塔楼工程为例,该结构体由伸臂桁架连接钢框架-钢筋混凝土核心筒组成,采用了ANSYS中生死单元的功能来模拟不同施工阶段,通过强震作用下的计算分析,将所得最大应力与材料容许应力对比、最大层间位移与相关规范要求的位移限值对比,评估结构的安全性。研究结果表明:不同模型下最大应力、层间位移及层间位移角均小于GB 50011—2010《建筑抗震设计规范》中的限值,结构在施工期内符合可靠性要求。通过对比,伸臂桁架在连接内外筒之后,对结构整体抗侧刚度有显著提高作用,最大Y向位移减少了12.1%,外框筒和核心筒最大Mises应力分别减少了33.3%和25.2%。The construction period of super high-rise building is long.In the whole construction process when the overall stiffness of the structure has not been formed,the safety of the structure under various construction loads,environmental wind and earthquake in the construction period was one of the key problems worthy of attention.In order to study the above problems,the numerical simulation method was adopted in this paper.The influence of strong earthquake on structural safety during construction was analyzed at different stages when the overall stiffness of the structure is incomplete.The South Tower of the Yinchuan Greenland Center super high-rise project was taken as an example.The structure consists of an outrigger truss connected steel frame-reinforced and concrete core tube.The birth and death technology of the element in ANSYS was used to simulate the whole process of the construction of the South Tower.Through calculation and analysis,the obtained maximum stress was compared with the allowable stress of the material,the maximum displacement was compared with the displacement limit required by the specification,and the safety of the structure was evaluated.The results showed that the maximum stress,inter-story displacement and inter-story drift ratio were smaller than the limits in the specification,and the structure could meet the reliability requirements during construction.It was found that the outrigger truss could significantly improve the lateral stiffness of the structure before and after connecting the inner and outer tubes,the maximum Y-direction displacement was reduced by 12.1%,and the maximum Mises stress of the outer frame tube and the core tube was reduced by 33.3%and 25.2%respectively.

关 键 词：超高层 施工过程 强震作用 伸臂桁架 

分 类 号：TU974[建筑科学—建筑技术科学]