浅谈后张法有粘结预应力梁施工工艺

本文旨在更有效地利用高强钢材,弥补混凝土与钢筋拉应变之间的差距,把预应力运用到钢筋混凝土结构中去。亦即在外荷载作用到构件上之前,预选建立有内应力的混凝土,通过对预应力筋进行张拉、锚固、放松,借助钢筋的弹性回缩,使受拉区混凝土事先获得预压应力。当构件承受由外荷载产生的拉力时,首先抵消混凝土中已有的预压力,然后随荷载增加,才能使混凝土受拉而后出现裂缝,因而延迟了构件裂缝的出现和开展。

On the Construction Technology of Post-tensioned Bonded Prestressed Girder

This thesis intends to achieve the purpose of using the high-strength steel more efficiently and bridge the tensile strain gap between the concrete and the steel .Specifically , by using the concrete with internal stress before the external loads force on the components , the concrete in the tension zone will access pre-stress through the stretching , anchoring and loosening of the prestressed reinforcing steel .When the components bear the tension from the external loads , the prestress in the concrete will firstly help to balance it , and only when the external loads increase , the concrete crack appears .Thus, the prestress retards the opening and the worsening of the crack .