【摘要】 针对钢管混凝土构件无明显的抗弯优势,而预应力能使预应力钢筋的高强抗拉性能得到发挥和使钢管混凝土构件具有良好抗压性能,分析了预应力对矩形钢管混凝土梁的影响,探讨了预应力矩形钢管混凝土梁的承载力特性,在受力机理分析基础上推导了其抗弯、抗剪承载力的计算公式。并且,运用大型通用有限元程序ANSYS对计算公式进行了校核,两者基本吻合,所推公式可以为工程实践提供设计参考。更多还原

【Abstract】 Concrete-filled steel tube(CFST) has no evident predominance in bend capacity.As is well-known that prestress can bring high tension strength of prestressed cable and good anti-compression capacity of CFST into play.It is tried to analyze the effect of prestress on concrete-filled rectangular steel tube beam.Characters of carrying capacity of prestressed concretefilled rectangular steel tube are discussed.Based on the analysis of mechanism, the formula used for calculation of the bend strength and shear strength are presented.Moreover,ANSYS is employed to verify the formula.The results obtained from ANSYS is basically in accordance with those from the formula,which prove the formula can give some reference for engineering practice.更多还原