About the author:

1. Zhejiang Jinggong Steel Building Group Co. , Ltd. , Shaoxing, Zhejiang 312030, China; 2. College of Civil andEnvironmental Engineering, Harbin Institute University, Shenzhen, Guangdong 518071, China;3. China Construction First Group Co. , Ltd. , Beijing 100161, China; 4. Shenzhen Haikeda ConsultingCo. , Ltd. , Shenzhen, Guangdong 518101, China

Abstract:

The tower and podium of the Hainengda Global Headquarters Building project are connected onfloor 3~7, with multiple large⁃span and large cantilever trusses, and the transmission path is complex. Atotal of 12 temporary support bed⁃jigs are arranged for the construction of the podium truss, which serveas important supports before the structure is formed. The unloading is the process of the redistribution ofinternal forces in the structure and the transformation into the design state, which has a significant impacton the structural forming state and construction safety. Through comparative research on three differentdismantling support schemes, the principle of east⁃west symmetrical unloading was ultimately chosen.Firstly, the support bed⁃jigs of the podium cantilever truss was unloaded, followed by the support bed⁃jigsof the tower cantilever truss, and finally, the support bed⁃jigs of the large⁃span cantilever truss betweenthe podium and the tower was unloaded. The rationality of the scheme was further verified by comparingtheoretical data with actual construction data.