高层悬挂结构卸载分析与监测  

Analysis and Monitoring of Unloading Process of High-Rise Suspended Structure

作　　者：石开荣[1,2] 吕俊锋[1] 姜正荣[1,2] 潘文智[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2017年第8期110-119,共10页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"十二五"科技支撑计划项目(2012BAJ03B06);广州市科技计划项目(1563000257)~~

摘　　要：高层悬挂结构因其悬挑跨度大、施工难度高,在采用顺向施工方法时需在悬挂结构下方设置临时支撑,待其与主体结构形成整体后再拆除临时支撑.临时支撑卸载过程较为关键,在此过程中结构受力体系会发生重大转换.为验证卸载技术的可靠性确保结构安全,以珠海仁恒滨海中心复杂高层悬挂结构为例,分别采用位移控制和支撑反力控制两种方法对其卸载过程进行了分析,并在卸载实施过程中选取关键构件的应力及关键点的竖向变形进行了跟踪监测.卸载分析与实测数据对比表明:以位移控制卸载和以支撑反力控制卸载对于刚度较大的本悬挂结构而言结果较为接近,且与实测结果总体相符;卸载完成后结构整体受力体系形成且趋于稳定.在此基础上,对悬挂结构卸载敏感性进行研究,通过对最不利支撑反力及支撑点变形进行分析,发现卸载过程中某一支撑点失效会导致其相邻支撑点反力、上部桁架的竖向变形及杆件应力发生较大变化,因此卸载过程中应采取有效措施以避免该类意外问题发生.Due to the fact that the high- r ise suspended structure is of a long cant i lethe structure is very difficult ’ when th e forward co n s tru c t io n me thod is ad o p ted ’ th e temposet under the suspended structure ’ a n d it c a n ’t b e removed u n t i l th e su sp en d e d s tru c tu re is in te g ra ted with th e mainstructure. The unloading process of the temporary support is very important ’ b e c a uis converted during the process. In order to verify the reliability of the unloading technology and ensure the struc-tural safety ’ by taking a complex high- r ise suspended structure of Zhuhai Renheng Marine Center as the example ’ the unloading process is analyzed respectively by means of the displacement controcontrol ’ and the stress of the key members and the vert ical deformation of the key nodes are monitored during theunloading process. The comparison between the unloading analysis results and the monitoringresults of the displacement control unloading and the supporting reaction force unloading are close to each other ’ and that they accord well with the monitoring data ’ an d th a t ’ a f te r th e u n lo ad in g ’ a whole s tru c tu ra l b e a r in g sys-tem forms and it tends to be stable. On this basis’ th e u n lo ad in g sensitivity of th e su sp en s io n s tru c tu re is in v e s t ig a -ted. By analyzing the most unfavorable supporting reaction force and the supporting point deformation ’ i t is c o n -cluded that the failure of one support point in the unloading process can cause the reaction forces of the adjacent support points as well as the vertical deformation and the member stresses of the upper truss to change greatly. Therefore ’ effective measures should be taken to avoid such unexpected proble.

关 键 词：悬挂结构 临时支撑 卸载分析 监测 

分 类 号：TU393.2[建筑科学—结构工程]