公路交通科技
公路交通科技
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JOURNAL OF HIGHWAY AND TRANSPORTATION RESEARCH AND DEVELOPMENT
2010年
4期
51-55
,共5页
桥梁工程%悬索桥%动力特征%Abaqus
橋樑工程%懸索橋%動力特徵%Abaqus
교량공정%현색교%동력특정%Abaqus
bridge engineering%suspension bridge%dynamic property%Abaqus
基于Abaqus平台建立了泰州3塔悬索桥三维有限元计算模型,采用Lanczos特征值求解方法分析了该桥的动力特征,研究了加劲梁竖向、横向和扭转刚度以及塔梁间设置弹性约束对大跨度3塔悬索桥动力特性的影响.研究结果表明,加劲梁竖向刚度、横向刚度、扭转刚度的变化均对相应方向上的振动频率有影响,对其他方向上振动频率影响甚小;中塔梁间的弹性拉索刚度仅影响竖向振动频率,当其刚度超过设计刚度后影响甚小;不设置弹性约束时,结构会出现纵飘振型;塔梁间的弹性约束对动力特性的影响大于缆梁间中央扣对动力特性的影响.
基于Abaqus平檯建立瞭泰州3塔懸索橋三維有限元計算模型,採用Lanczos特徵值求解方法分析瞭該橋的動力特徵,研究瞭加勁樑豎嚮、橫嚮和扭轉剛度以及塔樑間設置彈性約束對大跨度3塔懸索橋動力特性的影響.研究結果錶明,加勁樑豎嚮剛度、橫嚮剛度、扭轉剛度的變化均對相應方嚮上的振動頻率有影響,對其他方嚮上振動頻率影響甚小;中塔樑間的彈性拉索剛度僅影響豎嚮振動頻率,噹其剛度超過設計剛度後影響甚小;不設置彈性約束時,結構會齣現縱飄振型;塔樑間的彈性約束對動力特性的影響大于纜樑間中央釦對動力特性的影響.
기우Abaqus평태건립료태주3탑현색교삼유유한원계산모형,채용Lanczos특정치구해방법분석료해교적동력특정,연구료가경량수향、횡향화뉴전강도이급탑량간설치탄성약속대대과도3탑현색교동력특성적영향.연구결과표명,가경량수향강도、횡향강도、뉴전강도적변화균대상응방향상적진동빈솔유영향,대기타방향상진동빈솔영향심소;중탑량간적탄성랍색강도부영향수향진동빈솔,당기강도초과설계강도후영향심소;불설치탄성약속시,결구회출현종표진형;탑량간적탄성약속대동력특성적영향대우람량간중앙구대동력특성적영향.
A 3D finite element model for Taizhou triple-pylon suspension bridge was established by using Abaqus software. The dynamic property of the bridge was analyzed with Lanczos matrix solver. The effects of vertical, lateral and torsion stiffnesses of stiffening girders as well as the elastic restraints between mid-pylon and stiffening girders on the dynamic property of the long-span triple-pylon suspension bridge were studied. The results show that (1) variation of vertical, lateral and torsion stiffness of stiffening girders have effects on the vibration frequency in corresponding directions only and have little effects in other directions; (2) the stiffness of the elastic cables between mid-pylon and stiffening girders have effect on the vertical vibration frequency only and the influence diminishes quickly when the stiffness exceeds the value designed; (3) the longitudinal floating vibration mode occurs while there has no elastic restrain between mid-pylon and stiffening girders; (4) the elastic restrains between mid-pylon and stiffening girders have more effect on the dynamic property of the bridge than the central buckle does.