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本文编制了无粘结预应力混凝土多跨连续梁的计算程序,结合某工程实例,着重分析了多跨连续梁预应力筋曲线矢高变化对混凝土预压应力的影响,根据预压应力随矢高的变化规律,提出了连续梁各跨之间存在一个最佳矢高关系,以取得最合理的预应力效果。本文还运用ALCOR-93结构分析通用软件,对开孔板和不开孔板的预压应力进行对比分析,探讨了开孔楼板在开孔区不设预力筋的可行性。
In this paper, the calculation program of unbonded prestressed concrete multi-span continuous beam is compiled. Combined with an engineering example, the influence of the change of the pre-stress of the pre-stressed tendons of the multi-span continuous beam on the precompressive stress of the concrete is analyzed. According to the law of change, an optimal vector-to-height relationship exists between the spans of the continuous beam to obtain the most reasonable prestress effect. In this paper, ALCOR-93 structural analysis software is also used to compare the pre-compressive stress between the open-hole plate and the non-open-hole plate, and the feasibility of the open-hole floor without pre-tension bar in the open area is discussed.