CAJ | 학술논문

运用有限元软件ANSYS对某斜拉拱桥进行动力和稳定性分析,对比分析了横撑数量、形式及布置部位等因素对结构动力和稳定性能的影响.结果表明,斜拉拱桥的面外刚度低于面内刚度,且其横向稳定问题较普通拱桥更为突出;横撑布置方式对斜拉拱桥面外刚度和扭转刚度影响较大,对面内刚度影响很小;拱顶横撑质量对结构动力和稳定性能的影响较其刚度大,此处不宜采用"米"字撑;增大除拱顶外其他部位横撑刚度对提高结构动力和稳定性能的效果比增加横撑数量更为明显,但一定数量的横撑是保证结构横向刚度的前提,且"K"字撑对动力和稳定性能的影响较"米"字撑显著.
운용유한원연건ANSYS대모사랍공교진행동력화은정성분석,대비분석료횡탱수량、형식급포치부위등인소대결구동력화은정성능적영향.결과표명,사랍공교적면외강도저우면내강도,차기횡향은정문제교보통공교경위돌출;횡탱포치방식대사랍공교면외강도화뉴전강도영향교대,대면내강도영향흔소;공정횡탱질량대결구동력화은정성능적영향교기강도대,차처불의채용"미"자탱;증대제공정외기타부위횡탱강도대제고결구동력화은정성능적효과비증가횡탱수량경위명현,단일정수량적횡탱시보증결구횡향강도적전제,차"K"자탱대동력화은정성능적영향교"미"자탱현저.
In this paper, finite element (FE) program ANSYS was used to analyze dynamic performance and stability of a cable-stayed arch bridge. The influence of structural factors, such as the quantity, formation and arrangement of crossbars, on dynamic and stabilization characteristics were compared and analyzed. The results show that the out-of plane stiffness is weaker than the in-plane stiffness, and the issue of lateral instability is more prominent than that of the common arch bridge. The different crossbar arrangements have large influence on the out-of plane stiffness and the torsional stiffness and little influence on the in-plane stiffness. The mass of vault crossbar makes more contribution to the dynamic and stabilization characteristics than its rigidity. Therefore, 米-shaped crossbar should not be adopted in the vault area. The rigidity, rather than the quantity of the crossbar beyond the vault area, was more likely to enhance the dynamic and stabilization characteristics, hut the exist of a certain amount of crossbar was the premise to assure structural lateral rigidity, and K-shaped crossbar has more obvious influence on the dynamic and stabilization characteristics than 米-shaped crossbar.