山区特大跨径悬索桥跨缆吊机受力研究

摘要

桁式加劲梁由于其竖向刚度大、透风性能好而在大跨悬索桥中被采用，但山区特大跨悬索桥的加劲梁架设施工工艺一直是困扰其应用发展的因素之一。跨缆吊机架设法因其高空作业少、施工周期短而被用于山区悬索桥的加劲梁架设。为了保证安全，以山区特大跨径悬索桥钢桁加劲梁的架设安装为背景，采用 ANSYS建立了跨缆吊机钢桁架的有限元模型，并从强度、刚度和稳定性方面对钢桁架进行了分析研究。结果表明：在最不利荷载工况下，跨缆吊机的钢桁架强度满足要求，最大应力为157 MPa；钢桁架稳定性满足要求，第1阶失稳系数为12．1。%Due to the big vertical stiffness,good ventilation performance of truss stiffening girder,it is used in large-span suspension bridge,but the erection technology of the stiffening girder of mountain extra large span suspension bridge has been one of the factors in the development of its application. Deck erection gantry method has the advantages of less aerial operational work,short construction pe-riod and is widely used in stiffening girder erection of suspension bridges in mountainous area.In or-der to ensure safety,taking the construction installation of steel truss stiffening girder of mountains large span suspension bridge as the background,the finite element model of a cable crane steel truss is established,and the strength,stiffness and stability research on the force of the steel truss are ana-lyzed.The results show that under the most unfavorable load condition the strength of across steel truss meets the requirements of the cable crane,the maximum stress is 1 5 7 MPa,the stability of steel truss satisfies the requirement,and the first order buckling coefficient is 12.1.