Abstract
This study investigates the influence of auxiliary piers on the natural frequency, deformation characteristics, displacements of the related parts, and internal forces of a long‐span heterogeneous steel‐structured main tower cable‐stayed bridge. Taking the Guohe Third Bridge in Anhui Province as an example, the software ANSYS was used to establish a three‐dimensional finite element model of a cable‐stayed bridge, and the dynamic characteristics of a long‐span specially shaped hybrid steel structure main tower cable‐stayed bridge with auxiliary piers added to single span and double spans were analysed. The results show that when one or three pairs of auxiliary piers are added to a single span, the changes in the natural frequency and deformation characteristics are smaller than those when there are no auxiliary piers. When one or three pairs of auxiliary piers are added to each of the two spans, the natural frequency and deformation characteristics are relatively low. Auxiliary piers induce relatively large changes; the changes with 3 pairs of auxiliary piers for a single span is compared with those with 1 pair for a single span, and 3 pairs and 1 pair of auxiliary piers are added to both spans for comparison. The natural vibration frequency and deformation characteristics exhibit relatively small changes; the presence or absence of auxiliary piers and the number of auxiliary piers have a greater influence on the vertical displacement of the main girder and less influence on the vertical displacement of the main tower. An appropriate number of auxiliary piers are beneficial to the seismic resistance of a cable‐stayed bridge, and if the number of auxiliary piers is too large, the seismic capacity of the bridge is reduced; it is recommended that a pair of auxiliary piers be added to both spans to optimize the overall dynamic performance of a cable‐stayed bridge. This research method can be used on similar cable‐stayed bridges to optimize their dynamic characteristics by setting a certain number of auxiliary piers.
Highlights
With the innovation of structural analysis theory and the development and utilization of computer software, cablestayed bridges have developed rapidly due to their strong spanning ability, good wind resistance, and ease of maintenance [1]
Wang et al [14] studied the static and dynamic performance of a cable-stayed bridge with double vertical tower columns as an example, and the results showed that adding auxiliary piers to the side spans can reduce the horizontal displacement of the tower top of the cable-stayed bridge of the system. e deflection of the main beam effectively restrains the vibration of the main beam and improves the overall rigidity of the structure
With the addition of auxiliary piers, the natural vibration frequency, deformation characteristics, displacements and internal forces of the related parts of the whole bridge were analysed. e following conclusions are drawn: (1) When auxiliary piers are added to a single span, the natural frequency and deformation characteristics of the cable-stayed bridge structure change relatively little; when auxiliary piers are added to both spans, the natural frequency and deformation characteristics of the cable-stayed bridge structure change relatively greatly
Summary
Auxiliary Piers on Long-Span Specially Shaped Mixed Steel Structure Main Tower Cable-Stayed Bridge: Research on the Impact on the Dynamic Performance. Is study investigates the influence of auxiliary piers on the natural frequency, deformation characteristics, displacements of the related parts, and internal forces of a long-span heterogeneous steel-structured main tower cable-stayed bridge. Taking the Guohe ird Bridge in Anhui Province as an example, the software ANSYS was used to establish a three-dimensional finite element model of a cable-stayed bridge, and the dynamic characteristics of a long-span specially shaped hybrid steel structure main tower cable-stayed bridge with auxiliary piers added to single span and double spans were analysed. E natural vibration frequency and deformation characteristics exhibit relatively small changes; the presence or absence of auxiliary piers and the number of auxiliary piers have a greater influence on the vertical displacement of the main girder and less influence on the vertical displacement of the main tower. An appropriate number of auxiliary piers are beneficial to the seismic resistance of a cable-stayed bridge, and if the number of auxiliary piers is too large, the seismic capacity of the bridge is reduced; it is recommended that a pair of auxiliary piers be added to both spans to optimize the overall dynamic performance of a cable-stayed bridge. is research method can be used on similar cable-stayed bridges to optimize their dynamic characteristics by setting a certain number of auxiliary piers
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