框架结构预应力等效荷载实用分析

Modification and Application of Equivalent Loading of Prestressing in Frame Structure

荷载平衡法已广泛地应用于预应力混凝土结构的设计。在超静定预应力混凝土结构中由于施工要求,预应力筋实际线形在中间支座处不可避免地存在一过渡的曲线,使得预应力等效荷载不能全部与梁上均布荷载相抵消。根据结构力学原理对荷载平衡法进行改进,能针对预应力筋线形的实际布置情况方便地估算出等效荷载的大小。

The method of equivalent loads is used widely in the design of prestressed reinforced concrete structures. Considered construction technique, the transition curve for the shape of steel wire exists in middle support. So equivalent loads can not counterweigh the dead and live loads acting on beams. Applying the principle of structural mechanics, the formula for estimating the counterweigh loads acting on the beam is provided. The proposed practical method satisfies the requirement of design.