桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
3期
63-69
,共7页
预应力混凝土结构%空心墩%装配式桥墩%拟静力试验%模型试验%有限元法%纤维单元模型%数值分析
預應力混凝土結構%空心墩%裝配式橋墩%擬靜力試驗%模型試驗%有限元法%纖維單元模型%數值分析
예응력혼응토결구%공심돈%장배식교돈%의정력시험%모형시험%유한원법%섬유단원모형%수치분석
prestressed concrete structure%hollow pier%segmental pier%quasi-static test%model test%finite element method%fiber element model%numerical analysis
为研究预应力混凝土空心墩的抗震性能，对4个空心墩模型进行拟静力试验研究，并基于试件的破坏特征、滞回性能等试验结果，利用OpenSees软件，采用纤维梁柱单元模拟各空心墩在拟静力荷载下的力学行为，对比分析预应力混凝土整体式空心墩、装配式空心墩与钢筋混凝土空心墩的拟静力行为。结果表明：在钢筋混凝土空心墩中配置竖向无粘结后张预应力筋，可提高其刚度与水平抗力，增强滞回曲线的捏缩效应，减小残余位移，对累积滞回耗能影响不大；与整体式空心墩不同，添加耗能钢筋的预应力装配式空心墩没有出现明显的塑性铰区，曲率分布和剪切错动主要集中在墩底接缝处，滞回曲线呈明显的捏缩状，损伤程度较轻，其刚度、累积滞回耗能分别约为钢筋混凝土空心墩的100％、73％；建议的模型和方法能较准确地预测预应力空心墩的拟静力行为。
為研究預應力混凝土空心墩的抗震性能，對4箇空心墩模型進行擬靜力試驗研究，併基于試件的破壞特徵、滯迴性能等試驗結果，利用OpenSees軟件，採用纖維樑柱單元模擬各空心墩在擬靜力荷載下的力學行為，對比分析預應力混凝土整體式空心墩、裝配式空心墩與鋼觔混凝土空心墩的擬靜力行為。結果錶明：在鋼觔混凝土空心墩中配置豎嚮無粘結後張預應力觔，可提高其剛度與水平抗力，增彊滯迴麯線的捏縮效應，減小殘餘位移，對纍積滯迴耗能影響不大；與整體式空心墩不同，添加耗能鋼觔的預應力裝配式空心墩沒有齣現明顯的塑性鉸區，麯率分佈和剪切錯動主要集中在墩底接縫處，滯迴麯線呈明顯的捏縮狀，損傷程度較輕，其剛度、纍積滯迴耗能分彆約為鋼觔混凝土空心墩的100％、73％；建議的模型和方法能較準確地預測預應力空心墩的擬靜力行為。
위연구예응력혼응토공심돈적항진성능，대4개공심돈모형진행의정력시험연구，병기우시건적파배특정、체회성능등시험결과，이용OpenSees연건，채용섬유량주단원모의각공심돈재의정력하재하적역학행위，대비분석예응력혼응토정체식공심돈、장배식공심돈여강근혼응토공심돈적의정역행위。결과표명：재강근혼응토공심돈중배치수향무점결후장예응력근，가제고기강도여수평항력，증강체회곡선적날축효응，감소잔여위이，대루적체회모능영향불대；여정체식공심돈불동，첨가모능강근적예응력장배식공심돈몰유출현명현적소성교구，곡솔분포화전절착동주요집중재돈저접봉처，체회곡선정명현적날축상，손상정도교경，기강도、루적체회모능분별약위강근혼응토공심돈적100％、73％；건의적모형화방법능교준학지예측예응력공심돈적의정역행위。
To study the seismic performance of prestressed concrete (PC) hollow pier ,the quasi‐static tests for the 4 hollow pier models were made .Based on the tests of the damage charac‐teristics and hysteretic behavior of the pier specimens ,the mechanical behavior of each pier subjec‐ted to the quasi‐static load w as simulated by the fiber beam‐column element ,using the OpenSees software and the quasi‐static behavior of the monolithic PC hollow pier ,precast segmental PC hol‐low pier and reinforced concrete (RC) hollow pier was compared and analyzed .The results of the analysis demonstrate that the arrangement of the vertical unbonded post‐tensioning bars in the RC hollow pier can improve the stiffness and horizontal resistance capacity of the pier ,increase the pinching effect of the hysteretic curves and decrease the residual displacement ,but will not cause great influence on the cumulative hysteretic energy dissipation .Unlike the monolithic PC hollow pier ,the precast segmental PC hollow pier added with the energy dissipation bars does not have the obvious plastic hinge zone .T he curvature distribution and shear deformation mainly concen‐trate in the joint of the pier footing ,the hysteretic curves exhibit the obvious pinching state ,the damage to the pier is slight and the stiffness and cumulative hysteretic energy dissipation respec‐tively accounts for about 100% and 73% of those of the RC hollow pier .The proposed models and method in this paper can be used to accurately predict the quasi‐static behavior of the PC hol‐low pier .
