【摘要】 针对碳纤维增强聚合物(CFRP)布加固钢筋混凝土(RC)矩形空心截面桥墩的抗震性能问题,对8个CFRP加固的矩形空心桥墩试件体进行水平循环荷载作用下的抗震性能试验研究,分析CFRP试件体桥墩的破坏特征以及其弯曲延性、耗能以及滞回性能,并考虑到箍筋和CFRP的对核心混凝土的约束作用,提出一种考虑有效强度系数和面积配箍率的CFRP有效侧向约束力的简化计算方法。在此基础上,基于Open Sees程序中的纤维单元模型,分析CFRP加固RC矩形空心截面桥墩的侧向力和变形关系特性以及相关参数对其滞回性能的影响。研究结果表明,采用CFRP布加固可改变RC矩形空心墩柱的破坏形式和破坏位置,显著提高其耗能能力和延性,但对水平承载力影响较小。采用文中提出的CFRP有效侧向约束力的简化计算方法,可以较好地模拟CFRP约束RC矩形空心截面桥墩的侧向力和变形关系的滞回性能且计算效率高。更多还原

【Abstract】 To investigate the seismic performance of reinforced concrete( RC) hollow rectangular bridge columns retrofitted with carbon fiber reinforced polymer( CFRP),cyclic testing of eight RC specimens was performed under constant axial load and uniaxial bending. The failure characteristic,flexural ductility,dissipated energy and hysteretic behavior of RC rectangular hollow bridge columns constraint with CFRP are analyzed,and a simplified effective lateral confined model of CFRP is proposed by considering effective strength coefficient and area distribution ratio of CFRP hoops. The hysteretic behavior and its influence parameters of hollow rectangular bridge columns retrofitted with CFRP are studied based on fiber element model using the Open Sees program. The results indicate that the ductility and dissipated energy of the rectangular hollow bridge columns with CFRP are improved greatly,but the load capacity is less influenced. The proposed simplified analytical method can be well used to analyze the lateral force and deformation hysteretic behavior of hollow rectangular bridge columns retrofitted with CFRP.更多还原