Test and Ultimate Bearing Capacity Calculation of Stone Arch Bridges Strengthened with UHPC
WANG Zongshan1,2, YANG Jun1,*, ZHOU Jianting1, ZHANG Hong1
1 State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 Chongqing Transportation Construction Management Co., Ltd., Chongqing 401120, China
Abstract: To clarify the effect of UHPC on enhancing the bearing capacity of masonry arch bridges, a full process failure test and ultimate bearing capacity calculation analysis were conducted on stone arch bridges strengthened with UHPC. Four sets of stone arches with different types of UHPC materials, interface treatment methods and reinforcement layer thickness were designed and prepared. The structural failure mode, section strain development, crack propagation, and ultimate bearing capacity under concentrated load at the L/4 location were analyzed. The experimental results show that the unreinforced masonry arch exhibits a four-hinge failure mode, while the reinforced masonry arch exhibits two failure modes, one is a four-hinge failure and the other is a composite failure mode of four-hinge failure and interface debonding. The UHPC layer can effectively improve the ultimate bearing capacity and crack resistance of stone arches. The ultimate bearing capacity of unreinforced stone arches is only 0.46 kN, after reinforced with a 3 cm UHPC layer at the intrados, the ultimate bearing capacity of the specimens reaches more than 15 kN. While the tensile strength of UHPC increases from 6.21 MPa to 8.01 MPa, the average peak load of the reinforced stone arc increases from 14.13 kN to 22.27 kN. The calculation formula for the ultimate bearing capacity based on limit analysis method has a calculation error within 25%, which can predict the bearing capacity of reinforced stone masonry arches well. Parameter analysis shows that the ultimate bearing capacity of reinforced arch structures increases linearly with the increase of UHPC reinforcement layer thickness. However, due to the constraint of masonry compressive strength, to increase UHPC tensile strength does not significantly improve the ultimate bearing capacity, the material type of UHPC should be scientifically selected based on the compressive strength of masonry.
王宗山, 杨俊, 周建庭, 张洪. UHPC加固石拱桥试验与极限承载力计算[J]. 材料导报, 2025, 39(17): 24080230-7.
WANG Zongshan, YANG Jun, ZHOU Jianting, ZHANG Hong. Test and Ultimate Bearing Capacity Calculation of Stone Arch Bridges Strengthened with UHPC. Materials Reports, 2025, 39(17): 24080230-7.
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2025, Vol. 39 
