Application of C-Clamp Shaped Steel-Concrete Composite Structure in Bridge Widening
This paper presents a C-clamp shaped steel-concrete composite structure for bridge widening projects,which consists of the primary components of steel baluster railing,steel C-clamp and high-strength bolts as well as the UHPC pavement,aiming to avoid the expansion of substructure while widening the bridge deck and to reduce the longitudinal cracks and pavement damages in both the new and old decks.The presented structure has been utilized in the deck widening of the Guanxunxi bridge in Xiamen.First,on-site static tests were performed to study the mechanical property of the C-clamp shaped steel-concrete composite structure under horizontal loads,and numerical modelling was carried out to verify the reliability of the test results.As per the analysis,the test results well agreed with the numerical simulation.The displacements and stresses in the key locations of the C-clamp shaped steel-concrete composite structure varied linearly with the applied loads,with the maximum tensile stress in the steel plates reaching 75%of the steel yielding strength,and the overall composite structure was in elastic stage.The pre-tightening force effectively alleviated the direct shear effect on the high-strength bolt,thereby reducing the risk of shear fatigue damage.The engineering practice proves that when the deck of an existing bridge is widened by using the presented C-clamp shaped steel-concrete composite structure,there is no need to widen the substructure of the bridge,at the same time,the longitudinal cracking and pavement damages in the new and old decks can be effectively treated and controlled,and the widening effect is sound.
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