This paper introduces the main factors considered in a single long cantilever truss structure form selection of a building head of Nanjing Olympic Sports Community Center.Four comparison schemes were designed according to the different materials,directions,and floors of diagonal web members.The results show that the scheme of steel-concrete cantilever truss with diagonal web members on each floor has advantages in structure self-weight,deformation control,and construction convenience.Then,two finite element softwares were used to simulate the stress conditions of the truss,and the internal force results of the truss by the two softwares were basically consistent.By increasing the seismic grade,adding out-of-plane diagonal members,and adding steel sections in the beam,the seismic capacity,integrity,and redundancy of the truss were improved.The stress analysis of the floor slab indicates that the floor slab at the back span of the cantilever truss was in tension when under D+L condition,and the rebars of the floor slab should be increased.By establishing a simplified stress analysis model,the internal force of the end nodes of the diagonal web members was analyzed,and the L-shaped embedded parts were designed innovatively.The embedded parts and welds were envelope designed according to different stress forms.By increasing the slab thickness,and adding out-of-plane support beams,and horizontal trusses,the lateral force resistance of the cantilever truss was improved,and the chord members were designed as cantilever beams.
关键词
单榀桁架/悬挑桁架/斜腹杆/冗余度/L形埋件/抗侧力
Key words
single truss/cantilever truss/diagonal web members/redundancy/L-shaped embedded parts/lateral force resistance
维普
万方数据