低周反复荷载下再生混凝土梁柱节点纵筋粘结性能试验研究

发布时间：2018-04-26 14:32

本文选题：低周反复荷载试验 + 再生混凝土　；参考：《建筑结构》2017年21期

【摘要】：为研究低周反复荷载作用下贯穿于再生混凝土节点的纵向钢筋粘结性能,制作2榀再生混凝土框架中节点并进行试验。通过在柱两侧梁端的纵筋上预埋应变片,得到纵筋荷载-应变滞回曲线。根据同一根纵筋上两个测点应变差来计算区段内的平均粘结应力,进而获得了加载过程中节点试件通裂阶段、极限阶段、破坏阶段的纵筋相对粘结强度。试验结果表明,在试件通裂阶段和极限阶段,纵筋保有较为稳定的粘结应力,能够满足再生混凝土构件钢筋与混凝土之间通过粘结应力传递应力及协调变形的要求。粘结应力分布与钢筋直径有关,钢筋直径越大粘结应力退化越严重;柱侧梁端截面受压区混凝土达到极限压应变时,纵筋受压强度不能得到充分发挥,受压钢筋应力相对滞后。
[Abstract]:In order to study the bond behavior of longitudinal steel bar through recycled concrete joints under low cyclic cyclic loading, two joints in recycled concrete frames were fabricated and tested. The load-strain hysteretic curves of longitudinal tendons are obtained by embedding strain gauges on the longitudinal tendons at the end of the beams on both sides of the column. According to the strain difference between the two measuring points on the same longitudinal reinforcement, the average bond stress in the section is calculated, and the relative bond strength of the joint specimen in the cracking stage, the ultimate stage and the failure stage is obtained. The experimental results show that the longitudinal reinforcement maintains a relatively stable bond stress in the cracking and ultimate stages of the specimen, which can meet the requirements of stress transfer and coordinated deformation between the rebar and the concrete of recycled concrete members through bond stress. The distribution of bond stress is related to the diameter of steel bar, the larger the diameter of steel bar is, the more the bond stress is degraded, and when the ultimate compressive strain is reached, the compressive strength of longitudinal reinforcement can not be fully exerted, and the stress of compression steel bar lags behind.
【作者单位】：合肥工业大学土木与水利工程学院;安徽工程大学建筑工程学院;华汇工程设计集团股份有限公司;
【基金】：住房与城乡建设部科学技术计划资助项目(2013-K4-46) 安徽省高等教育提升计划省级自然科学研究一般项目(TSKJ2015B05)
【分类号】：TU375

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