调整施工次序释放大跨度托梁变形设计方法在某大学生中心的应用  

Design method of adjusting the construction sequence to release the deformation of large-span joist and its application in the project of the university student center

作　　者：蔡银亮 张志刚 尹卫军 闫军晓 郭宇 余华彬 Cai Yinliang;Zhang Zhigang;Yin Weijun;Yan Junxiao;Guo Yu;Yu Huabin(CITIC General Institute of Architectural Design and Research Co.Ltd,Wuhan 430014,China)

机构地区：[1]中信建筑设计研究总院有限公司,湖北武汉430014

出　　处：《建筑科学》2025年第1期153-159,共7页Building Science

摘　　要：某大学生中心项目第四层大跨度托梁与上部结构结合后共同受力,因托梁刚度有限产生下挠引起托柱下沉产生的内力超过其自身承载力。为解决该问题,本项目结合托梁与上部结构形成刚度的过程,精细分析结构承担荷载的种类和施加时间,对比计算托梁与上部结构作为整体不同承载方式,并结合现场实际施工情况,提出了用于混凝土凝固的施工间歇期,推迟了屋面构件与下部托梁形成刚度共同作用,释放了托梁因自重变形导致托柱不均匀下沉产生的附加内力。通过按调整施工次序后的施工步进行内力计算,验证了采用该方法释放大跨度托梁变形调整结构内力传递的效果;通过对结构全过程施工模拟分析和托梁极端工况下的承载力验算,结果表明:该设计思路进行结构设计可行且经济性较好。The fourth-floor large-span cantilever beam in a university student center project,when combined with the upper structure,experiences shared loads.Due to the limited stiffness of the cantilever beam,it undergoes deflection,causing internal forces exceeding its own bearing capacity and resulting in sinking of the supporting columns.In order to solve this problem,the project integrates the stiffness between the cantilever beam and the upper structure.It conducts a detailed analysis of the types of loads the structure bears and the timing of their application.By comparing the calculations of the cantilever beam and the upper structure as an integrated system using different load-bearing methods,and considering the actual on-site construction conditions,the project proposes a construction intermittent period for concrete curing.This period delays the interaction between the roof components and the lower cantilever beam,releasing the additional internal forces generated by the uneven sinking of the supporting columns due to the self-weight deformation of the cantilever beam.The effectiveness of this method in releasing the deformation of the large-span cantilever beam and adjusting the internal force transfer in the structure is verified by calculating internal forces based on the adjusted construction sequence.Through simulation analysis of the entire construction process and bearing capacity verification of the cantilever beam under extreme conditions,the results indicate that this design approach is feasible and economically advantageous for structural design.

关 键 词：大跨度托梁 空腹桁架 施工模拟分析 调整内力传递 

分 类 号：TU318[建筑科学—结构工程]