粘钢加固钢筋混凝土箱型桥墩双向恢复力模型研究

考虑不同初始损伤程度、粘贴钢板厚度、轴压比和长细比等参数，设计制作了10个钢筋混凝土箱型截面桥墩缩尺模型，对其进行了粘钢加固后的双向拟静力试验。基于纤维截面的M-#x00424;关系计算了桥墩连续曲线式及三线式的双侧向力-墩顶位移骨架曲线，并理论结合试验数据给出了卸载刚度，结果表明理论计算的骨架曲线、滞回曲线与试验曲线较好的吻合，理论模型可以反映各重要参数对恢复力特性的影响，具有较好的通用性。最后基于理论模型进行了桥墩最大荷载及极限位移的影响参数分析。

STUDY ON BI-DIRECTIONAL MODEL OF RESTORING FORCE OF HOLLOW REINFORCED CONCRETE PIERS STRENGTHENED BY ADHERING STEEL PLATES

Ten scaled models of hollow reinforced concrete piers were designed, fabricated, and strengthened by adhering steel plates in lab. A number of important parameters, including initial damage degree, steel plate thickness, axial compression ratio and slenderness ratio etc., were considered in these models. The multi-dimensional hysteretic behaviors of the strengthened models were explored by using the bi-directional quasi-static testing method. Based on the section M-#x003a6;relations, the bi-directional load-displacement skeleton curves and three-segments-lines skeleton curves of the piers were derived, and the unloading stiffness was obtained from the theoretical analysis and the experimental data. It is shown that the theoretical restoring force curves, which agree well with the experimental results, can reflect the influence of the main parameters with good versatility. Finally, according to the theoretical model the parametric analysis on the maximum load and the ultimate displacement were conducted.