Model Test and Finite Element Analysis of Arch Bridge Response to Cable Failure
A 1∶40 scale model of the Guangzhou Haixin arch bridge was designed and fabricated to investigate the influence of cable failure on its structural performance.Two types of cable failure tests-slow unloading of the cable tension and sudden cutting of the cable were conducted to examine the changes in the static and dynamic responses of the remaining bridge components.A finite element model was subsequently established using the ANSYS software to simulate the cable breaking process and structural response through transient analysis.The experimental results show that a cable failure at the L/4 arch rib has the most significant impact on the neighboring cables,and the proportion of redistributed cable tension decreases with increasing distance from the failure zone.For neighboring cables at the same distance from the failed cable,the shorter the cable length,the greater the proportion of redistributed cable tension.When cables at the mid-span and L/4 positions break,their tension can be assumed to be entirely borne by the remaining cables;when cables near the arch foot break,part of their tension is redistributed by the remaining cables according to their proportionate distance while the remainder is directly transferred to the arch rib through the arch-beam connection.The dynamic amplification factor of the tension in the cables adjacent to a failed cable at different typical positions is 1.3-1.8.The results of this study can provide a reference for the structural safety assessment of arch bridges after cable failure.
bridge engineeringcable breakingmodel testarch bridgefinite element analysisdynamic amplification factor(DAF)
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