Suspension rod force and main cable shape combined calculation method for suspension bridge

Abstract

The invention discloses a suspension rod force and main cable shape combined calculation method for a suspension bridge. The method comprises the following steps of (1) establishing a coordinate system by taking a mid-span left tangent point and suspension points of the suspension bridge as coordinate origins, and representing catenaries of main cable sections; (2) supposing a group of suspensionrod forces, namely endowing each suspension force with an initial value; (3) calculating a completed bridge cable shape and an internal force of a mid-span main cable by utilizing an analysis method;(4) according to the numerical values calculated in the step (3), building a suspension bridge finite element model, calculating the suspension rod force, checking an error between a value of the suspension rod force and an assumed value of the suspension rod force by using a Euclidean norm, and if the error exceeds a limit value, returning to the step (2) together with the newly calculated suspension rod force, otherwise, obtaining the mid-span main cable shape and the accurate suspension rod force of the suspension bridge; and (5) calculating a side-span main cable shape by utilizing a horizontal component of the internal force of the mid-span main cable as an existing condition. According to the method, the accurate suspension rod force and the corresponding completed bridge main cableshape of the suspension bridge can be obtained, wherein the completed bridge main cable shape comprises accurate position of the tangent point.

Description

technical field [0001] The invention relates to a calculation method for design and construction control of a suspension bridge, in particular to a joint calculation method for suspension bridge hanger force and main cable formation bridge alignment. Background technique [0002] The spanning capacity of the suspension bridge is the best among common bridge types. With the continuous improvement of bridge design and construction level, the span records of suspension bridges are constantly being refreshed, such as the completed Akashi Kaikyo Bridge in Japan (main span 1991m) and Xihoumen Bridge in China (main span 1665m), as well as the under construction in Mexico City, Italy. Take the Strait Bridge (main span 3300m) and China's Yangsigang Yangtze River Bridge (main span 1700m). [0003] Suspension bridges are different from cable-stayed bridges in that they cannot realize the design alignment through tracking and adjustment during the construction stage. Its main cable ali...

AI Technical Summary

Problems solved by technology

It is convenient to use the finite element method to calculate the suspender force, but the simulation of the saddle is difficult. Neither the use of multiple rigid members nor the saddle-cable element that integrates the saddle and the cable can make the main cable The point of contact with the saddle changes continuously with the stress on the main cable

The calculation process of the analytical method is clear, and it is convenient to deal with the tangent point between the main cable and the saddle, but it is not convenient to calculate the boom force

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