会议室预应力混凝土曲梁布筋和设计方法研究

Research on prestressed bar distribution and design method of prestressed concrete curved beam of conference hall

会议室预应力混凝土曲梁往往具有跨度大、半径大、圆心角小等特点,预应力配筋主要应针对竖向平面内的弯矩,同时尽可能减小扭矩的作用。曲梁中预应力的效应应包含由于水平向等效荷载产生的分布等效扭矩。为了尽可能减小扭矩的不利作用,提出了预应力筋在截面横向偏置的布筋方式。实例计算结果表明,这一布筋方式在保证竖向平面弯曲效应的前提下,起到了降低扭矩峰值的作用。

Prestressed curved beams of conference hall are usually have characteristics of large span,big radius,small central angle,etc.Prestressed bars are applied to balance the moment in the vertical plane and minimize the torque action.It is suggested that the prestressing effect should include the distributed equivalent torque under horizontal equivalent loads.In order to minimize the adverse effect of the torque action,bars should be arranged eccentrically in the horizontal section.Examples showed that prestressed bars arranged in this pattern could reduce the peak torque and balance the moment in vertical plane at the same time.