钢桁架转换层上部结构施工监测分析  

Construction Monitoring Analysis of Upper Structure for Steel Truss Transfer Floor

作　　者：赵超群 高小飞 岳兵 沈龙飞[1] 朱笛 张国皓 吴金志[2] 孙国军[2] ZHAO Chaoqun;GAO Xiaofei;YUE Bing;SHEN Longfei;ZHU Di;ZHANG Guohao;WU Jinzhi;SUN Guojun(China Railway Construction Engineering Group Co.,Ltd.,Beijing100071,China;Beijing University of Technology,Beijing100124,China)

机构地区：[1]中铁建工集团有限公司,北京100071 [2]北京工业大学,北京100124

出　　处：《施工技术（中英文）》2024年第20期117-122,127,共7页Construction Technology

基　　金：国家自然科学基金面上项目(51278009)。

摘　　要：钢桁架转换层作为一种重要的结构形式,在高层建筑中起着承载和转换作用。因其自重较小、施工速度快且能提供较大室内空间,被广泛应用于新型高层住宅、写字楼等建筑。钢桁架转换层与两侧核心筒竖向刚度差异较大,在上部荷载及两者之间竖向变形差作用下,转换层两侧连接处及关键杆件承受较大压力并发生变形,这对施工安全及整体结构稳定性提出了严峻挑战。依托秦皇岛金梦海湾二期住宅工程,对钢桁架转换层关键部位及杆件布置应变、变形测点,在施工过程中实时监测;采用有限元软件MIDAS Gen对整体结构进行三维建模,考虑混凝土收缩徐变等参数,对钢桁架转换层上部结构进行施工过程仿真分析,并将模拟结果与实际监测数据进行对比。结果表明:在上部楼层施工过程中,最大应力位于第1榀桁架跨中腹杆,钢桁架转换层整体应力低于构件屈服应力,具有足够的安全储备以承受后续施工荷载;最大竖向变形位于第2榀桁架跨中位置,处于合理范围内;钢桁架转换层测点应力、变形模拟值与监测值吻合较好,验证了仿真方法的准确性。Steel truss transfer floors,as an important structural form,play a bearing and transformation role in tall buildings.Due to their light self-weight,fast construction speed,and the ability to provide large interior spaces,they are widely used in new tall residential and office buildings.The steel truss transfer floor has a significant difference in vertical stiffness between the two core tubes on both sides.Under the influence of upper loads and vertical deformations between them,the connection points on both sides of the transfer floor and key components bear significant pressure and occur deformation,which poses severe challenges to construction safety and the overall structural stability.Based on the Qinhuangdao Jinmeng Bay Phase II residential project,strain and deformation monitoring points were arranged for key parts and members of the steel truss transfer floor during construction.The finite element software MIDAS/Gen was used to create a three-dimensional model of the overall structure,considering parameters such as concrete shrinkage and creep,to simulate the construction process of the upper structure of the steel truss transfer floor.The simulation results were compared with actual monitoring data.The results showed that during the construction of the upper floors,the maximum stress was located at the mid-span of the first truss,and the overall stress level of the steel truss transfer floor was lower than the yield stress of the components,providing sufficient safety margin to withstand subsequent construction loads.The maximum vertical deformation occurred at the mid-span of the second truss,and the deformation was within a reasonable range.The stress and deformation simulated values of the steel truss transfer floor monitoring points matched well with the actual monitoring data,verifying the accuracy of the simulation method.

关 键 词：高层建筑 钢桁架 转换层 监测 有限元分析 应力 变形 

分 类 号：TU974[建筑科学—建筑技术科学]