CAJ | 학술논문

排架在山区桥梁工程中应用广泛，其横桥向地震破坏机理复杂且缺乏工程实用的抗震分析手段。通过拟静力和动力时程分析给出了山区桥梁排架抗震能力评估的一般性方法，借助纤维梁柱单元并结合截面抗剪强度模型，首先基于静力分析手段确定了排架桥墩可能的破坏模式及排架变形能力。在此基础上通过动力时程分析，揭示不同地震动强度下排架的破坏模式和变形能力。以某山区桥梁2个排架墩为例，将建立的评价方法对排架横桥向抗震能力进行评价。结果表明：横桥向在地震作用下，排架桥墩承受显著的变轴力作用，桥墩屈服前，随侧向位移增大，桥墩轴压变化范围逐渐增大，桥墩屈服后轴压变化范围基本稳定；且变轴力易引起排架桥墩发生剪切破坏。该方法可为桥梁排架结构抗震设计和评估提供参考手段。
배가재산구교량공정중응용엄범，기횡교향지진파배궤리복잡차결핍공정실용적항진분석수단。통과의정력화동력시정분석급출료산구교량배가항진능력평고적일반성방법，차조섬유량주단원병결합절면항전강도모형，수선기우정력분석수단학정료배가교돈가능적파배모식급배가변형능력。재차기출상통과동력시정분석，게시불동지진동강도하배가적파배모식화변형능력。이모산구교량2개배가돈위례，장건립적평개방법대배가횡교향항진능력진행평개。결과표명：횡교향재지진작용하，배가교돈승수현저적변축력작용，교돈굴복전，수측향위이증대，교돈축압변화범위축점증대，교돈굴복후축압변화범위기본은정；차변축력역인기배가교돈발생전절파배。해방법가위교량배가결구항진설계화평고제공삼고수단。
Bents are widely used as bridge columns in mountain areas.The seismic failure mechanism of the bents is complex under transverse seismic actions.Also,no practical seismic analysis method is available to evaluate the seismic behavior of the bents.A practical seismic analysis method for RC bridge bents in mountain areas was proposed based on the quasi-static and dynamic time-history analysis.The failure mode of the pier and the deformation capacity of the bent were analysed by using the fiber column element and shear strength model for column section.Then,the failure mode and deformation capacity of the bent under different ground motion intensity were revealed according to the time-history analysis.The seismic behaviors of 2 bridge bents in one bridge in mountain areas were evaluated by the proposed method. It is found that the axial load of the piers in the bent will be changed significantly as a result of the transverse seismic action.Before yielding of the pier,the variation range of the axial load increases as the lateral displacement increases. After yielding of the pier,the range will change no more and the variable axial load would lead to shear failure of the piers.The results provide reference to the seismic design and analysis of bridge bents.