Cable-stayed bridge forming cable force optimization method

Abstract

The invention relates to a cable-stayed bridge forming cable force optimization method. The method is a cable-stayed bridge forming cable force optimization method based on a target tracking-iterativeupdating algorithm. According to the method, the midspan deflection of the cable-stayed bridge in the bridging state serves as a tracking target, a cable-stayed bridge model is established through anANSYS parameterized programming language, the bridging cable force of the cable-stayed bridge is optimized through an analysis method of tracking the midspan deflection and iteratively updating a real constant array, and the bridging state design requirement of the cable-stayed bridge is met. The method has the advantages that the requirements of design specifications of the cable-stayed bridge are more visually and specifically reflected, initial cable force is applied in a mode of endowing a unit real constant, bridging cable force is solved through a method of iteratively updating a cableforce real constant array of the inhaul cable, the program design is simple, complex correction calculation is not needed, and the calculation efficiency is improved. Moreover, the mutual influence between the cable forces of the stay cables of the cable-stayed bridge is considered, and the precision of optimizing the cable force of the finished bridge is improved by adopting a method of adjustingthe cables of the whole bridge.

Description

technical field [0001] The invention belongs to the field of bridge and culvert engineering in the transportation industry, in particular to a method for optimizing the cable force of a cable-stayed bridge. Background technique [0002] The bridge cable force of a cable-stayed bridge is the key to ensure a reasonable stress state and geometric alignment of the cable-stayed bridge. The mutual influence is relatively obvious, and it is difficult to determine the cable force of the bridge using the existing cable force optimization method, which often requires multiple optimization processes, which is not only time-consuming and cumbersome, but also has low solution accuracy. [0003] At present, the maximum vertical deflection of the main girder is clearly stipulated in the design code of the cable-stayed bridge. The optimization method of the cable force of the completed bridge mainly takes the design cable force as the target value, and reduces the error with the design cab...

AI Technical Summary

Problems solved by technology

[0004] After retrieval, the patent CN201010501911.4 discloses a method for determining the initial cable force of a cable-stayed bridge when it is initially completed. It is a method for determining the initial cable force of a cable-stayed bridge based on the ANSYS secondary development platform. Considering the geometric nonlinear effect, iteratively solve and correct the initial strain of the cable under the action of constant load, specifically: first assume that any set of initial cable forces are added to the cable in the form of initial strain, add the dead load and calculate , through the *do-loop command language, extract the calculated cable force and check whether the error between the cable force and the target bridge force is within the allowable range, if the error is too large, modify the initial cable force by the difference method Strain, and then recalculate until the error is within the allowable range. The initial strain of a set of cable-stayed cables used in the last calculation is multiplied by the elastic modulus corrected by the cable-stayed cables considering the sag effect. The initial cable force of the bridge; this method has improved the solution time and the accuracy of the initial cable force of the cable-stayed bridge bridge, so that the method has great practical engineering application value, but there are still certain defects in this method: 1. The invention adopts multiple Target control, the tracking target is relatively complex and indirect, and the control is difficult, which cannot guarantee the accuracy and accuracy of the initial bridge cable force analysis; The efficiency is low, and the accuracy of the initial cable force analysis cannot be guaranteed; 3. When the geometric structure of the cable-stayed bridge is known but the design cable force is unknown, the cable force optimization method of this invention will not be able to complete the optimization of the bridge force, thereby affecting Mechanical performance analysis of the follow-up cable-stayed bridge and optimization and adjustment of the whole bridge structure

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