CAJ | 학술논문

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.
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.