后张预应力混凝土框架梁板设计新方法

根据现行规范对抗震框架梁的诸多规定,提出承载能力极限状态考虑地震作用组合的梁端截面最大弯矩限值计算公式。引入预应力平衡度和预应力荷载平衡度的概念,建立了沟通规范的裂缝控制验算应力差限值与传统荷载平衡法的数学关系式。给出预应力框架梁及连续梁(单向板)在正常使用极限状态下估算有效预拉力Npe的直接设计法,可在预应力结构初步设计阶段使用。算例计算结果表明,对于柱网均匀的多跨连续梁或连续单向板,该法的计算精度较高。

New Design Method of Post-tensioned Prestressed Concrete Frame Beam and Continuous Beam(One-way Slab)

Based on the present regulations in the code for the frame structure,the calculation formula of the maximum moment at the beam end and bearing capacity limit state considering the earthquake load combination is put forward.The concepts of prestress equivalent degree and load equivalent degree are introduced.The relation between the difference values of the controlling prestress in the codes and traditional load-balancing method is set up.The direct calculation method of effective prestress of prestressed concrete frame beam and continuous beam at the normal use limit state is given.The method can be adopted at the preliminary stage for structure design.The results of an example show that,for the continuous beam and one-way slab of frame structure with uniform span,the method has highly precise.