全装配穿索式脊杆索穹顶结构极限承载性能研究OA北大核心

To solve the common problems of relaxation failure of the ridge cable,low structural stiffness and bearing capacity,and extensive on-site welding of the supporting ring beam in the current cable dome structure,a fully assembled cable-piercing ridge-tube cable dome(FCRCD)structure system was invented for industrial intelligent construction.The structure system consists of two parts:a cable-piercing ridge-tube cable dome and a modular assembly ring truss.The calculation method of structural prestress distribution was proposed based on the node balance method,and the research on structural prestress distribution was completed.In order to verify the ultimate bearing capacity of the structure,a test model with a scale of 1:10,a span of 10m and a rise-span ratio of 1/10 was designed and manufactured.The static ultimate load test and numerical simulation of the structure were conducted.The mechanical properties of the FCRCD under various vertical loads were investigated,and the structural failure mode,stress mechanism,and the variation laws of internal force,displacement and strain of the structure were obtained.The research results show that the prestressing distribution calculation method of the FCRCD can be used in structural design.The FCRCD has good stiffness,bearing capacity,stability,and resistance to uneven load.The bearing capacity corresponding to the normal service limit state is 2.2 times of the fundamental combination of the design load,and the safety factor of the ultimate bearing capacity is 5.0.The force transmission path of the Cable-piercing Ridge Tube(CRT)is simple and clear:only the ridge cable plays a role in tension,and the ridge tube plays a role in compression.It can effectively limit the relaxation of the ridge cable to approximately 12％before the ridge tube buckles.The FCRCD can be applied to the rapid assembly and construction of super-long-span spatial structure buildings,and can meet the requirements of rigid roof laying.