部分预应力混凝土梁的应力和变形

详细信息

THE STRESS AND DEFORMATION OF PARTIALLY PRESTRESSED CONCRETE BEAMS

Research Institute of Structural Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043;2. Department of Bridge Engineering, Tongji University, Shanghai 200092

摘要: 本文运用有限元步进法,结合按龄期调整的有效模量法,对部分预应力混凝土梁在不同荷载阶段截面的应力和变形进行了分析探讨。分析时不仅考虑了混凝土的收缩、徐变以及预应力钢筋的松弛等因素的时效影响,而且当混凝土中所受的拉应力超过其抗拉强度时还考虑了混凝土开裂的影响。根据分析方法编制了部分预应力混凝土梁的计算分析程序,并运用该程序对某座部分预应力混凝土梁的截面应力和变形进行了详细分析。
- 部分预应力 /
- 龄期 /
- 有效模量法 /
- 应力和变形
Abstract: With the step-by-step finite element method and the age-adjusted effective modulus method, sectional stresses and deformations of partially prestressed concrete beam at various loading stages have been analyzed in this paper. The analysis accounts for the time-dependent effects of creep and shrinkage of concrete and relaxation of prestressed steel which includes the effects of cracking when the tensile strength of concrete is exceeded. A computer program of partially prestressed concrete beam has been developed to perform the analysis. The sectional stresses and deformations of a partially prestressed concrete beam are analyzed in detail.
- partially prestressed /
- age /
- effective modulus method /
- stress and deformation