不同吊杆形式下人行悬索桥的力学性能分析

为了研究吊杆形式对人行悬索桥力学性能的影响,以某人行悬索桥为工程背景,采用Midas/Civil软件分别建立竖直吊杆和倾斜吊杆2种形式下的人行悬索桥有限元模型,进行合理成桥状态的找形计算,并对2种模型的静、动力性能进行分析.结果表明:1)竖直吊杆模型内部吊杆内力大小均匀,影响线均为正值,倾斜吊杆模型内部外倾吊杆内力大于...

Mechanical property analysis for suspension footbridge with different hanger systems

To research the influence of the hanger system on the mechanical properties of suspension footbridge,the finite element models of a suspension footbridge with vertical and inclined hanger systems were established respectively by using Midas/Civil software.The calculation of finding reasonable cable shape was carried out,and the static and dynamic properties of the two models were analyzed.The results indicate that,the internal force of the vertical hanger is uniform,and the influence line is positive,while the internal force of the outward-tilting inclined hanger is larger than that of the inward-tilting hanger,and the influence line has both positive and negative value;In the vertical hanger model,the internal force of the main cable is basically uniformly distributed with almost no axial force in the main beam and larger displacement in both the main cable and the main beam.Compared with the vertical hanger model,the declined hanger model has larger gradient but smaller value in the internal force of the main cable,larger axial force in the main beam,smaller displacement in both the main cable and the main beam,and larger vibration frequencies in first ten order modes.Under the static wind load,the internal force and displacement of the wind resistance system in both two models are similar to each other,and are less affected by the hanger form.Both the lateral and vertical stiffness of the inclined hanger model are larger than those of the vertical hanger model,which is more suitable for suspension footbridge with small live load.The suspension footbridge with vertical suspender system and inclined suspender system can be comprehensively compared and analyzed from the perspective of static and dynamic performance,which provides a theoretical basis for the structural system optimization of this kind of bridge.