ABSTRACT
This essay uses the Pingnan Xiangsizhou Bridge, a double-tower, double cable plane steel-concrete composite girder cable-stayed bridge in the Guangxi Zhuang Autonomous Region. Double main girders were employed in the finite element models of the full-bridge spatial rod system to simulate the steel-concrete composite girders. The initial reasonable completion state is determined using the minimum bending energy method. The bridge cable force is then iteratively corrected using the unknown load coefficient method. By pouring three wet joints of the main girder segments at once, the three-section cyclic construction optimizes the building of the Xiangsizhou Bridge. Based on this, the forward iteration method is employed to identify the cable-stayed bridge's reasonable construction state. The findings indicate that four months can be cut from the bridge's construction duration when the construction schedule is followed by optimization. Throughout construction and under the most unfavorable load combinations in the state of the completed bridge, the maximum tensile and compressive stresses in the concrete slab and steel main girders did not exceed the specification limitations. The cable force value and the reasonable completion state match excellently, with a maximum error of 1.42%.
