低回缩预应力锚具锚下混凝土应力的试验研究
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龙源期刊网 低回缩预应力锚具锚下混凝土应力的试验研究
作者：邵旭东肜辉张阳曾田胜
来源：《湖南大学学报·自然科学版》2010年第02期
摘要: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.
关键词:矩形板试验;应力分析;低回缩预应力锚具;锚下构造;峰值应力
中图分类号:U448.35;U441.5文献标识码:A
Experimental Study of Concrete Stress under Low Retracting Pre-stress Stranded Anchorage
SHAO Xu-dong,RONG Hui,ZHANG Yang,ZENG Tian-sheng
(College of Civil Engineering, Hunan Univ, Changsha, Hunan 410082, China)
Abstract: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 type of steel plate under the anchorage was used, the maximum stress of the cross-section was similar, and did not exceed the strength of concrete. Therefore, compared with the traditional anchorage, the low retracting pre-stress stranded single anchorage has the same construction under the anchor.
Key words:test specimens; stress analyses; low retracting pre-stressing anchorage
system;construction under anchorage; maximums stress