预应力钢绞线的合理布设

Reasonable Layout of Prestressing Strand

研究目的:基础建设中,预应力连续梁的使用越来越广泛,预应力钢绞线位置布置得合理性,直接影响到工程的质量、造价和结构的使用寿命。现针对预应力连续梁的力学受力特点,对预应力钢绞线布置位置进行合理设计。研究结论:在超静定梁中,混凝土压力线只与束筋的梁端偏心距和束筋的跨内形状有关,与束筋在中间支点上的偏心距无关。只要保持束筋在超静定梁的两端位置不变,保持束筋在跨内的形状不变,而只改变束筋在中间支点上的偏心距,则梁内的混凝土压力线不变。

Research purposes： In fundamental construction, the use of prestressed concrete continuous beam is more and more popular. Engineering quality, construction costs and service life are influenced by the reasonableness layout place of prestressing strand. Aiming at the characteristics of under press of prestressed concrete continuous beam, a justified location for prestressing strand is designed. Research conclusions： In statically indeterminate beam, press line of concrete has something with eccentric distance in beam end and the shape in girder span of bundled bars, and has nothing with eccentric distance in middle support. It would static, no matter how to alter eccentric distance in middle support, so long as maintain the location of the two ends and shape of bundled bars.