Research on Mechanical Property of Arch-Deck Knuckle of Arch Bridge of Combined Basket-Handle Arch and Continuous Deck System
This study investigates the mechanical property of the knuckles of the arch bridge of combined basket-handle arch and continuous deck system,with the Wulongjiang River Bridge carrying a portion of the Fuzhou Metro Binhai Express as a case.A high-fidelity finite element model of the knuckle was established for whole-process nonlinear analysis,considering the effects of large deformation and material nonlinearity,to obtain the stress distributions in the knuckle at different load stages and to analyze the failure modes and mechanical property of the knuckle.It is shown that as the loads increase,the intersections of the outer stiffeners and bottom plates of the arch springings of the central arch were the first to yield,with the most unfavorable cross-section located at the intersection of the arch walls and diaphragm inside the arch springing.The elasticity and plasticity coefficients of the knuckle were 2.32 and 4.71,respectively.When the loads reached 3.57 times of the most unfavorable load combination,the corner of the intersection of the arch walls and diaphragm inside the arch springings in the most unfavorable cross-section yielded first.When the loads reached 4.71 times of the most unfavorable load combination,a large portion of the most unfavorable cross-section yielded,and the yielded zones in the arch walls spread towards the whole cross-section,as a result,the arch lost load bearing capacity due to the oversized yielding zone.During the spread of the yielding zone of the arch walls,the inner and outer stiffeners yielded one after another.It is concluded that adding external stiffeners can delay the yield of the arch walls.
basket-handle steel box archcombined arch and girder systemarch-deck knucklestress distributionmechanical propertyfinite element method
万方数据
维普
