贝雷梁钢便桥动力响应影响因素分析  

Dynamic Influence Analysis of Temporary Steel Bridge with Bailey Beam

作　　者：许贵满[1] 韩海娅 Xu Guiman;Han Haiya(Department of Construction Engineering and Design,Qiannan Polytechnic For Nationalities,Duyun 558000,China)

机构地区：[1]黔南民族职业技术学院建筑工程与设计系,贵州都匀558000

出　　处：《石家庄铁道大学学报（自然科学版）》2020年第1期20-24,73,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：以跨度24 m的下承式贝雷梁钢便桥作为研究对象,采用ANSYS建立三维空间有限元模型,运用瞬态动力分析方法,移动荷载模拟车辆过桥的整个过程,分析不同车速、不同加强方案对钢桥的动力响应影响。结果表明:加强弦杆能提高钢桥固有频率,不能改变其振型;随着车速的提高,钢桥的最大竖向动位移、振动加速度均呈现非线性增加;使用加强弦杆能够提高钢桥刚度,降低振动幅值,减弱车速对钢桥振动加速度的影响;从钢桥动力响应的角度考虑弦杆加强方案,由优到劣依次为上下弦杆加强、上弦杆加强、下弦杆加强、无加强弦杆;无论是否使用加强弦杆都会使得内外侧贝雷梁变形不一致,因变形差异微小可忽略不计。综合考虑,建议贝雷梁作为钢便桥使用时,宜加强上下弦杆以减小动位移,限速50 km/h以降低钢桥振动影响。A bailey beam temporary steel bridge with 24 m span is selected as the research object,and a 3D finite element model is established by ANSYS.The method of transient dynamic analysis is adopted.The whole process of vehicle passing the bridge is simulated with the moving load.The influence of different speed and different strengthened measures on the dynamic response of bridge is analyzed.The results show that the strengthening chord can improve the natural frequency of steel bridge,but can’t change the vibration mode.The maximum vertical dynamic displacement and vibration acceleration of steel bridge ascend nonlinearly with the increase of speed.Strengthened-chords can enhance bridge stiffness and reduce the amplitude of steel bridge,and also can weaken the influence of vehicle speed on the vibration acceleration of steel bridge.From the point of view of dynamic response of steel bridge,the upper and lower strengthened-cords,upper strengthened-cords,lower strengthened-cord and without strengthened-cords are suggested to use in order.The force and deformation of the inner and outer bailey beams become uneven whether or not to use the strengthen-chords.However,the difference of uneven deformation is small and can be ignored.The strengthened-chords should be installed at the upper and lower side of temporary steel bridge to descend the dynamic deformation.The speed should be less than 50 km/h to descend the dynamic response of steel bridge.

关 键 词：钢桥 贝雷梁 移动荷载 加强弦杆 动力分析 

分 类 号：U448.29[建筑科学—桥梁与隧道工程]