A Joint Calculation Method of Suspender Force and Main Cable Alignment of Suspension Bridge

Abstract

The invention discloses a method for joint calculation of suspender force and main cable shape of a suspension bridge. The method comprises the following steps: (1) Establishing a coordinate system with the left tangent point of the midspan of the suspension bridge and each suspension point as the origin of coordinates, representing each section of the main cable (2) assuming a group of suspender forces, that is, an initial value is given to each of the suspender forces; (3) using analytical methods to calculate the bridge alignment and internal force of the mid-span main cable; (4) Set up the finite element model of the suspension bridge according to the numerical value calculated in step (3), calculate the force of the boom, check the error with the assumed value of the force of the boom with the Euclidean norm, if the error exceeds the limit value, carry The newly calculated suspender force returns to step (2), otherwise the mid-span main cable shape and accurate suspender force of the suspension bridge are obtained; (5) utilize the horizontal component of the mid-span main cable internal force as a known condition to calculate the edge Across the main cable shape. The invention can obtain the precise suspender force of the suspension bridge and the corresponding bridge alignment of the main cable, wherein the bridge alignment of the main cable includes the precise 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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