Abstract
The geometric agreement, commonly hailed as load-transferring paths within bridge structures, is significantly crucial to the bridge structural mechanical performance, such as capacity, deformation, and collapse behavior. This paper presents a methodology dependent on alternative load paths to investigate the collapse behavior of a double-pylon cable-stayed bridge with steel truss girders subjected to excess vehicle loading. The cable-stayed bridge with steel truss girders is simplified using a series-parallel load-bearing system. This research manifests that the enforced vehicle loading can be transferred to alternative paths of cable-stayed bridges in different load-structure scenarios. A 3-D finite element model is established utilizing computer software ANSYS to explore the collapse path of cable-stayed bridge with steel truss girders, taking into account chord failure, loss of cables together with corrosion in steel truss girders. The results show that chord failures in the mid-portion of the mainspan result in brittle damage in truss girders or even sudden bridge collapse. Further,the loss of long cables leads to ductile damage with significant displacement.The corrosion in steel truss girders has a highly slight influence on the collapse behavior of cable-stayed bridge. The proposed methodology can be reliably used to assess and determine the vulnerability of cable-stayed bridge with steel truss girders during their service lifetime, thus preventing structural collapses in this type of bridge.
Highlights
Bridge structural collapse is characterized withcollapse of an entire structure or a disproportionate portion in structure resultingfrom initial local failure in an individual member.e failures of criticalmembers in bridge structures typically occur due to overloading
The deformation and cable force of a double-pylon cable-stayed bridge with steel truss girders are considered using a series-parallel load-bearing system to investigate the transfer of the absorbed loads to alternative paths in different scenarios. e collapse behavior of the bridge is analyzed using increasing traffic loads to determine the optimal structural system
Since the truss girder is a series bearing system with a lack of alternative load paths, the absorbed load is not transferred to the cables, resulting in small changes in the cable forces
Summary
Bridge structural collapse is characterized withcollapse of an entire structure or a disproportionate portion in structure resultingfrom initial local failure in an individual member. The deformation and cable force of a double-pylon cable-stayed bridge with steel truss girders are considered using a series-parallel load-bearing system to investigate the transfer of the absorbed loads to alternative paths in different scenarios. 3. Numerical Model e alternative load paths of the bridge during the failure of individual members are investigated to study the collapse behavior of the cable-stayed bridge. E conceptual collapse model of the series-parallel system depicts the configuration of the alternative load paths in the cable-stayed bridge. BEAM189 has three nodes with six degrees of freedom at each node, i.e., three translations in the nodal x-, y-, and z-directions and three rotations around the x-, y-, and z-axes [17]. e beam element is based on the Timoshenko beam theory, which
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