Pre-camber setting method for long-span track-specific cable-stayed bridges
A pre-camber, long-span technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of not considering the influence of vehicle-bridge coupling effects on special cable-stayed bridges for long-span tracks, and not targeting long-span tracks. Principles and methods of special cable-stayed bridges, not taking into account short-term effects and long-term effects
Active Publication Date: 2017-05-17
CHONGQING JIAOTONG UNIVERSITY +1
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Problems solved by technology
[0005] In order to solve the pre-camber setting method of cable-stayed bridges in the prior art, there are no specific principles and methods for cable-stayed bridges dedicated to long-span tracks, short-term effects and long-term effects are not taken into account, and vehicle-bridge coupling effects are not considered. The influence of cable-stayed bridges and other issues, the present invention proposes a method for setting the pre-camber of cable-stayed bridges dedicated to long-span tracks
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[0061] The method for setting the pre-camber of a cable-stayed bridge dedicated to a long-span track according to the present invention obtains bridge geometry and material parameters according to the design and construction requirements, establishes a finite element model, and obtains the displacement value caused by the load factor; determines the elasticity of the hanging basket based on the loading test of the hanging basket Deformation value; Determine the displacement value caused by prestress loss based on the prestress loss test; Determine the shrinkage and creep deformation value during the construction period and the shrinkage and creep deformation value during the operation period based on the concrete model test; Pre-camber caused by displacement, or, establish dynamic equations, and determine the pre-camber caused by vehicle-bridge coupled dynamic displacement by numerical solution; use the vector algorithm to calculate the total pre-camber; check the internal force...
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The invention relates to a method for setting a pre-camber of a special cable-stayed bridge for a long-span rail. The method comprises the following steps: acquiring geometric and material parameters of the bridge according to the design and construction requirements, establishing a finite element model and obtaining a displacement value caused by a load factor; on the basis of a loading experiment of a hanging basket, determining an elastic deformation value of the hanging basket; on the basis of a prestress loss experiment, determining a displacement value caused by prestress loss; on the basis of a concrete model experiment, determining a construction period concrete shrinkage and creep deformation value and an operation period concrete shrinkage and creep deformation value; on the basis of a vehicle-bridge coupling experiment, determining a pre-camber caused by vehicle-bridge coupling dynamic displacement, or establishing a kinetic equation set and determining the pre-camber caused by vehicle-bridge coupling dynamic displacement according to a numerical solution method; calculating the total pre-camber by utilizing the theorem of vector operation; carrying out calculation checking on a structural internal force so as to determine the final pre-camber. The method has the beneficial technical effects of sufficiently considering influence of the vehicle-bridge coupling on the line form of the special cable-stayed bridge for the long-span rail, disclosing the method of setting the reasonable pre-camber and providing theoretical support and technical support for obtaining the final ideal state of the bridge.
Description
[0001] field of invention [0002] The invention relates to a technology for setting the pre-camber of a cable-stayed bridge dedicated to a long-span track, in particular to a method for setting the pre-camber of a cable-stayed bridge dedicated to a long-span track. Background technique [0003] With the massive construction and gradual improvement of the rail transit route network, cable-stayed bridges are widely used in rail transit due to their beautiful structure, strong spanning ability, and mature construction technology. However, since the loads borne by rail-specific bridges are trains, they have the characteristics of large structural range, large load excitation, obvious structural response, and the structural state is greatly affected by loads. The long-span track-specific cable-stayed bridge with light rail traffic as the main load, because it is a flexible structure, the overall stiffness of the structure is relatively weak, so the deformation of the bridge is lar...
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IPC IPC(8): G06F19/00G06F17/50
Inventor 周建庭黎小刚仲建华牛云峰郭增伟肖阳剑陈增顺
Owner CHONGQING JIAOTONG UNIVERSITY