The dynamic behavior of a bridge-erecting machine, carrying a moving mass suspended by a wire rope, is investigated. The bridge-erecting machine is modelled by a simply supported uniform beam, and a massless equivale...The dynamic behavior of a bridge-erecting machine, carrying a moving mass suspended by a wire rope, is investigated. The bridge-erecting machine is modelled by a simply supported uniform beam, and a massless equivalent ＂spring-damper＂ system with an effective spring constant and an effective damping coefficient is used to model the moving mass suspended by the wire rope. The suddenly applied load is represented by a unitary Dirac Delta function. With the expansion method, a simple closed-form solution for the equation of motion with the replaced spring-damper-mass system is formulated. The characters of the rope are included in the derivation of the differential equation of motion for the system. The numerical examples show that the effects of the damping coefficient and the spring constant of the rope on the deflection have significant variations with the loading frequency. The effects of the damping coefficient and the spring constant under different beam lengths are also examined. The obtained results validate the presented approach, and provide significant references in the design process of bridgeerecting machines.展开更多
In this article, the current railway box girder bridge erecting machines at home and abroad are briefly introduced and analyzed, the research & design situation of class 900t railway box girder bridge erecting mac...In this article, the current railway box girder bridge erecting machines at home and abroad are briefly introduced and analyzed, the research & design situation of class 900t railway box girder bridge erecting machines is described, and also the principle for determining the overall plan and a series of issues much concerning the design of key components of class 900t railway box girder bridge erecting machines are described.展开更多
结合大跨径40 m T梁架设实际工程,通过分析实际架桥机在架设T梁的过程中对柔性高墩的几个最不利荷载组合,利用有限元软件Midas Civil建立椅柯大桥的模型,分析在几个最不利荷载组合下柔性高墩的墩顶位移、墩身最大压应力、线性屈曲特征...结合大跨径40 m T梁架设实际工程,通过分析实际架桥机在架设T梁的过程中对柔性高墩的几个最不利荷载组合,利用有限元软件Midas Civil建立椅柯大桥的模型,分析在几个最不利荷载组合下柔性高墩的墩顶位移、墩身最大压应力、线性屈曲特征值等判断柔性高墩的抗倾覆安全稳定性,对柔性高墩的T桥梁架设安全性具有一定的参考借鉴价值。展开更多
基金supported by the National Natural Science Foundation of China(No.11472179)
文摘The dynamic behavior of a bridge-erecting machine, carrying a moving mass suspended by a wire rope, is investigated. The bridge-erecting machine is modelled by a simply supported uniform beam, and a massless equivalent ＂spring-damper＂ system with an effective spring constant and an effective damping coefficient is used to model the moving mass suspended by the wire rope. The suddenly applied load is represented by a unitary Dirac Delta function. With the expansion method, a simple closed-form solution for the equation of motion with the replaced spring-damper-mass system is formulated. The characters of the rope are included in the derivation of the differential equation of motion for the system. The numerical examples show that the effects of the damping coefficient and the spring constant of the rope on the deflection have significant variations with the loading frequency. The effects of the damping coefficient and the spring constant under different beam lengths are also examined. The obtained results validate the presented approach, and provide significant references in the design process of bridgeerecting machines.
文摘In this article, the current railway box girder bridge erecting machines at home and abroad are briefly introduced and analyzed, the research & design situation of class 900t railway box girder bridge erecting machines is described, and also the principle for determining the overall plan and a series of issues much concerning the design of key components of class 900t railway box girder bridge erecting machines are described.
文摘结合大跨径40 m T梁架设实际工程,通过分析实际架桥机在架设T梁的过程中对柔性高墩的几个最不利荷载组合,利用有限元软件Midas Civil建立椅柯大桥的模型,分析在几个最不利荷载组合下柔性高墩的墩顶位移、墩身最大压应力、线性屈曲特征值等判断柔性高墩的抗倾覆安全稳定性,对柔性高墩的T桥梁架设安全性具有一定的参考借鉴价值。
