低回缩预应力锚具锚下混凝土应力的试验研究

低回缩预应力钢绞线体系是一种新型预应力体系.为了研究新型二次张拉低回缩预应力锚具的锚下构造,设计了采用二次张拉单孔预应力钢绞线锚具的预应力矩形梁试验,将理论计算结果分别与传统夹片式锚具锚下应力场、新型二次张拉低回缩预应力锚具锚下应力场进行对比,发现在张拉过程中三者锚下应力场的变化规律一致.当采用相同型号的锚下垫板时,各截面应力峰值相差很小,且均未超过试验混凝土的强度.因此,二次张拉单孔预应力钢绞线锚具锚下构造可与传统夹片式锚具完全相同.

Experimental Study of Concrete Stress under Low Retracting Pre-stress Stranded Anchorage

Low retracting pre-stressing anchorage system(LRPAS) is a new type of post-tensioned prestressing system.An experimental study was carried out to investigate the structural behavior under the new LRPAS.A scaled test specimen using low retracting pre-stress stranded single anchorage was constructed and tested.Based on the strain measurements,the stress field under the traditional anchorage and the new LRPAS were obtained,and the test results were consistent with the theoretical calculation ones.When the same...