先张及后张预应力矩形梁疲劳受力性能研究

摘要

The reasonable reinforcement ways of broken line reinforcement prestressed concrete pretensioned beam, overcome the disadvantage of traditional linear pretensioning reinforcement,which can not adapt to the actual stress of structure,increase the span,and avoid the defects of post tensioning method in the construction process and durability etc. It can effectivly control the diagonal crack emergence of beam end. Through indoor test,the broken line reinforcement prestressed concrete beam can improve the fatigue of the beam body stress performance ,and prolong the using life of bridge.%折线配筋预应力混凝土先张梁采用合理的布筋方式，克服传统直线先张法布筋方式与结构的实际受力特点不相适应的缺点，增加了跨度；同时避免了后张法在耐久性和施工工艺等方面缺陷，有效地控制了梁端斜裂缝的出现。通过室内试验验证，折线配筋预应力混凝土梁提高了梁体的疲劳受力性能，能够较好地延长桥梁使用寿命。