中文摘要：

鉴于破坏模式对钢筋混凝土桥墩抗震加固和基于性能的抗震设计中性能目标量化的重要性,根据钢筋混凝土桥墩的破坏特点和破坏模式,统计分析各国钢筋混凝土桥墩抗震试验资料。基于钢筋混凝土桥墩抗剪需求和能力的关系,对混凝土强度f′c、纵筋配筋率ρl、体积配箍率ρv、规则化的纵筋配筋率、规则化的体积配箍率、轴压比、剪跨比a/h0和规则化的箍筋间距进行双参数相关分析和偏相关分析,确定各因素与桥墩塑性铰区抗剪需求与能力比值Vp/Vn的相关程度。研究结果表明：以ρl≤2.173%、a/h0≥3.880、Vp/Vn=0.7作为钢筋混凝土桥墩弯曲破坏模式的判别条件,以Vp/Vn〉1.0且a/h0≤1.865作为剪切破坏模式的判别条件,以1.865≤a/h0≤3.880作为弯剪破坏模式的判别条件是合理的。

英文摘要：

In the light of the importance of failure mode for seismic retrofitting and performance index quantization based on performance anti-seismic design,according to pier failure characteristics and failure mode of reinforced concrete bridge,anti-seismic test data of reinforced concrete piers at home and abroad were compiled and analyzed.Based on the relation between shearing resistance demand and shear capacity of reinforced concrete bridge,in order to investigate the relevance of shearing resistance demand to shear capacity ratio in plastic-hinge zone of piers and factors as follows： concrete compressive strength f′c,longitudinal reinforcement ratio ρl,transverse reinforcement ratio ρv,longitudinal reinforcement index,transverse reinforcement index,axial load ratio,aspect ratio a/h0 and hoop spacing to depth ratio,two-parameter correlation analysis and partial correlation analysis of the factors in above were carried out.A failure mode index model was developed to identify pier failure modes： flexure failure,flexure-shear failure and shear failure.Results show that piers with Vp/Vn=0.7,ρl≤2.173% and a/h0≥3.880 are expected to fail in flexure;piers with Vp/Vn1.0 and a/h0≤1.865 are expected to fail in shear;the conditions that piers with 1.865≤a/h0≤3.880 are expected to fail in flexure-shear failure are reasonable.