考虑受力状态变换的预应力混凝土转换梁设计

Design of Prestressed Concrete Transfer Beam Considering the Transformation of Stress State

为减小预应力转换梁支承框架柱端部的巨大弯矩以及张拉产生的不利次内力,该文采用了“先铰接后刚接”的分阶段设计方法,并设计了新颖的“钢管柱铰”。采用PKPM软件对预应力转换梁进行了配筋、抗裂及挠度等指标的计算,并优化了预应力筋的张拉施工方案。计算结果以及后续的施工表明,该种柱铰有效缓解了次内力问题。另外,该文还介绍了该种预应力转换梁的设计过程及要点,可供同类工程参考。

In order to reduce the huge bending moment at the end of the prestressed transfer beam supporting frame columns and the unfavorable secondary internal force caused by tension,this paper adopted a phased design method of"articulated first and then rigidly connected",and designed a novel"steel column hinge".The PKPM software was used to calculate indicators like the reinforcement,crack resistance and deflection of the prestressed transfer beam,and optimized the tension construction plan of the prestressed tendons.The calculation results and subsequent construction showed that this kind of column hinge effectively alleviates the problem of secondary internal forces.In addition,the design process and key points of this kind of prestressed transfer beam were introduced,which can be used as a reference for similar projects.