钢管混凝土张弦劲性梁受弯性能试验研究

Research on the Flexural Performance of CFST String Structure Stiffened RC Beam

钢管混凝土张弦劲性梁是一种自承重新型组合梁,施工时可以通过自承重实现免支撑。为了解这种梁的受弯力学性能,设计制作了5根试件。通过试验分析了破坏特征、弯矩-挠度关系、无粘结预应力筋应力增长曲线并验证平截面假定,建立了正截面抗弯承载力和刚度计算方法。

Concrete filled steel tube(CFST)string structure stiffened RC Beam is a new kind of selfsupporting composite beam,which can be self-supporting for construction.To understand the flexural performance of CFST string structure stiffened RC Beam,5 specimens have been made and tested.Base on test,the cracks development and failure models of specimens have been observed,the moment-deflection relationship and stress of unbonded prestressed tendons are analyzed,the plane section assumption are verified,and the calculation methods of flexural capacity and stiffness of normal section are proposed.