钢筋混凝土桥墩破坏模式识别方法  

Failure Mode Identification Method of Reinforced Concrete Bridge Pier

作　　者：刘鸣[1] 陆本燕[1,2] 刘伯权[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]十九冶成都建设有限公司,四川成都611730

出　　处：《中国公路学报》2011年第3期58-63,79,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51078037);教育部高等学校博士学科点专项科研基金项目(20100205110010);陕西省自然科学基础研究计划项目(2010JM7002)

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。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.

关 键 词：桥梁工程 钢筋混凝土桥墩 相关分析 破坏模式识别 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]