摘要
竖向预应力筋对箱梁腹板产生的竖向压应力计算,关系到腹板主拉应力计算和抗裂问题,现行桥梁设计规范有关预压应力的计算公式没有考虑预应力在锚下的扩散。本文从弹性理论的解析解出发,讨论竖向预应力下考虑应力扩散的箱梁腹板压应力计算问题,最后给出竖向预应力筋合理间距和扩散角的计算公式。
Compressed stress by vertical prestressing tendons within the web of box beam has much to do with the web's principal tensile stress and cracking problem.In current Chinese specification,however,the calculation of such compressed stress does not consider the prestressing diffusion phenomena.Based on the analytical solution of elasticity theory,this paper discusses the calculation method for the vertical compressed stress considering the prestress diffusion.The formulae for the rational distance between vertical tendons and for stress diffusion angle are suggested in the end.
出处
《公路交通科技》
CAS
CSCD
北大核心
2004年第12期54-57,共4页
Journal of Highway and Transportation Research and Development
关键词
箱梁
竖向预应力
应力扩散
主拉应力
Box beam
Vertical prestressing
Stress diffusion
Principal tensile stress
