环肋型悬挑桁架在某体育场钢结构罩棚中的应用

APPLICATION OF RING-RIBBED CANTILEVER TRUSS IN THE STEEL SHED OF A STADIUM

某体育场结合建筑屋盖的连续造型,采用“环肋型悬挑桁架+外圈立体桁架约束环+端部钢拉杆+局部柱间V形支撑”的结构体系。该结构体系充分利用屋盖曲面的整体面内刚度,并在外圈设置一道立体桁架的约束环,以形成良好的整体刚度。其中,屋盖曲面的面内刚度由其各榀悬挑桁架上弦连续的交叉斜撑提供。屋盖钢结构体系仅通过铰接钢柱脚支承在2层混凝土楼盖上,与下部混凝土结构为相对独立受力体系,避免两者之间的不利影响。重点介绍这种结构体系的静力性能、非线性极限荷载分析及抗连续倒塌性能分析设计。

Combined with the continuous shape of building roof,a stadium adopts a structure system of ring-ribbed cantilever truss,three-dimensional truss restraint ring for outer ring,end steel tie rod and partial column V-shaped support.The roof structural system makes full use of in-plane stiffness of the roof,and a good integral stiffness provided by a constraining ring of a three-dimensional truss on the outer ring.The in-plane stiffness of the roof is provided by the continuous cross braces of the chords of each of the overhanging trusses.The roof steel is supported on the two-story concrete structure by the hinged steel column,and the concrete structure is a relatively independent force system to avoid the adverse effects between the two.The paper focused on the static performance of this structural system,and discussed its nonlinear ultimate load analysis and anti\|progressive collapse performance analysis design.