摘要
讨论了引起混凝土预应力T梁纵向开裂的原因,分析了张紧的预应力钢束对梁体上拱变形的反向作用和受压混凝土由泊松效应引起的横向拉应变作用,并结合理论分析和数值方法提出了考虑上述作用下T梁预应力管道的最小保护层厚度的计算公式。
The causes of longitudinal cracks of prestressed concrete T-beam are discussed. The great transverse tension stress on the bottom floor caused by the reversed effect of tensional prestressed steel bar on up-flexion of T-beam and the overlapping enhancing Poisson effect are analyzed. Combining with theoretic analysis and numerical computing method, a formula is deduced to compute the minimum protective layer thickness of the prestressed pipeline under the disadvantageous stress.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2009年第4期660-663,共4页
Journal of Chongqing Jiaotong University(Natural Science)
基金
国家自然科学基金项目(50808188)
关键词
预应力混凝土T梁
保护层厚度
横向拉应力
prestressed concrete T-beam
protective layer thickness
transverse tension stress
