配筋钢纤维高强混凝土薄壁箱梁受扭性能分析

本文在配筋钢纤维高强混凝土薄壁箱形截面纯扭构件试验研究的基础上,应用空间软化桁架理论,结合钢纤维高强混凝土本构关系及其软化系数方程,编制了软化桁架模型分析程序对试验构件进行了全过程分析。分析时考虑了钢纤维高强混凝土的抗拉强度作用,不仅能较准确地得到极限扭矩,而且可以获得开裂扭矩,能较好地模拟试验构件的受力-变形全过程。其结论也得到其它相关钢纤维高强混凝土纯扭构件试验结果的证实。在此基础上应用软化桁架模型分析程序对配筋钢纤维高强混凝土薄壁箱形截面纯扭构件进行了参数分析,提出了相应的开裂扭矩和极限扭矩计算公式,为其工程应用提供依据。

Torsional behavior of reinforced SFHSC thin walled box girder

Based on the experimental study of steel fiber high strength concrete (SFHSC) thin walled box girder with pure torsion , the full range of torsional behavior of the member has been studied by the corresponding nonlinear analysis program in which the space softening truss theory with constitutive laws and softened coefficient equation of SFHSC has been involved. It can be found that both ultimate torsion and cracking torsion of the test member can be simulated well if the tensile strength of SFHSC is considered in the model. The conclusion of the present study has also been verified by other relevant pure torsion experiment results of SFHSC members. Based on the parametric study on SFHSC box girder using the program developed , the formulae about cracking torsion and ultimate torsion have been proposed, which can be served as a reference for engineering application.