大跨空间预应力杂交结构设计

Structural design of large-span spatial prestressed hybrid structure

遵义师范学院体育馆可容纳3000名观众,总建筑面积为12670m2。大跨屋盖平面呈八角形,纵向跨度95m,横向跨度72m。屋盖采用空间桁架-局部单层预应力杂交结构,并支承在八根不等高钢筋混凝土柱顶。位于柱顶的弹性支座既减小了水平推力又提供了足够的刚度。基于屋盖结构的复杂程度进行了静力分析、非线性稳定性分析及抗连续倒塌分析。分析结果表明:该屋盖结构受力合理,支座形式选取恰当;在各个荷载组合工况下结构指标良好;按最低阶模态进行的非线性稳定性分析中结构极限承载力荷载系数6.017,远大于规范要求的2.0;基于拆除构件法的瞬态动力分析表明,各受力较大部位的构件失效后,结构仍处于弹性阶段。结构具有一定的内力重分布能力,不会发生连续倒塌。结构设计满足规范及建筑功能的要求。

In this paper,The Zunyi Normal University Gymnasium can accommodate 3,000 spectators and has a total construction area of 12,670 square meters.The large-span roof has an octagonal shape,with a longitudinal span of 95 meters and a transverse span of 72 meters.The roof adopts a spatial truss local single-layer prestressed hybrid structure,supported on top of eight unequal height reinforced concrete columns.Elastic bearings placed on the column tops reduce horizontal thrust and provide sufficient stiffness.Static analysis,nonlinear stability analysis,and anti-progressive collapse analysis were conducted based on the complexity of the roof structure.The analysis results indicate that the roof structure is subjected to reasonable loads and the chosen support system is appropriate.The structural performance is excellent under various load combinations.The nonlinear stability analysis,conducted based on the lowest mode shape,yields a load factor of 6.017,which is significantly higher than the required value of 2.0 according to the specifications.Based on the transient dynamic analysis using the component removal method,it is demonstrated that even after the failure of components in highly stressed regions,the structure remains in the elastic range.The structure exhibits a certain degree of internal force redistribution capability,ensuring that progressive collapse does not occur.The structural design satisfies both the specifications and the requirements of the building functionality.