一阶段受力对混合配预应力筋叠合梁力学性能影响研究

Research on the first-loading sensibility of composite beams with hybrid prestressed tendons

提出并介绍了应用二次预应力技术的新型叠合梁——混合配预应力筋叠合梁,并简要分析了其受力的特点和适用的范围。通过数值模拟方法就一阶段受力对后张有粘结与后张无粘结两种不同工艺的混合配预应力筋叠合梁的力学性能产生的影响进行了重点分析,分析内容主要包括梁的抗裂性能、刚度退化以及极限承载力等方面。结果表明,因为预应力筋传力机制不同,一阶段受力对采用后张有粘结或无粘结预应力的混合配预应力筋叠合梁的力学性能有明显不同的影响。

A new type of composite beam,which applies second inflicted prestressed technology was presented and introduced. The unique characteristic and the range of application were discussed. The mechanical properties of prestressed concrete composite beams with bonded or unbonded post-tension technique under first-loading were analyzed through numerical simulation method,including beam crack resistance,stiffness degradation and ultimate bearing capacity and so on. The result shows that the first-loading has different influences on the beams with two different post-tension for the working mode of prestressed tendon.