Abstract
The strength, stiffness, and stability check calculations and the effect of earthquakes should be considered in the design of cable-stayed arch bridges with collaborative systems. This study aims to investigate the dynamic performance and structural response of cable-stayed arch bridges under seismic action. The space analysis model is enhanced of the Xiang Feng River Bridge using finite element software Midas Civil, whose lower foundation considers the effects of piles and soil. Firstly the vibration period, vibration frequency, and modal characteristics are computed, thus the dynamic performance is summarized of the bridge. Then, a proper seismic wave is selected according to engineering conditions and in terms of three orthogonal directions: inputting the adjusted El Centro seismic wave, considering Rayleigh damping, and calculating via the Newmark method. Furthermore, a time-history response analysis under the action of one-dimensional and multidimensional earthquake is performed. Lastly, the results of the response analysis is compared and the behavior characteristics of arch bridge is summarized under seismic action. The results show that the transverse stability problem of bridges is prominent and should be the focus of antiearthquake fortification, the inclined cable tower of this bridge is not conducive to the earthquake resistance of the structure in comparison with the vertical cable tower. and the influence of horizontal and vertical earthquake actions should be considered in antiearthquake designs.
Highlights
The major load-bearing parts of cable-stayed bridges are the cable stays, bridge towers, and stiffening beams [1]
Analysis of the table reveals the following: 1) A comparison of the maximum values of internal force calculated in each component under five working conditions shows that the values are basically under the same magnitude. This result indicates that the effect of one-dimensional and multidimensional earthquakes on the bridge structure should be paid the same degree of attention when performing a seismic analysis of cable-stayed arch bridges
The strength, stiffness, and stability check calculations and the effect of earthquakes should be considered in the design of cable-stayed arch bridges with collaborative systems
Summary
The major load-bearing parts of cable-stayed bridges are the cable stays, bridge towers, and stiffening beams [1]. It is a cooperative system bridge composed of a steel suspension bridge and a prestressed concrete cable-stayed bridge. The span is (2 × 75 + 420 + 2 × 75) m It is a double-tower, self-anchored, cable-stayed suspended bridge, and the main beam is steel box girder. It consists of two arched ribs at the top and a typical double-tower cable-stayed bridge. The span is (80 + 90 + 190 + 432 + 190 + 90 + 80) m It is composed of a cable-stayed bridge with double-tower double-cable prestressed concrete and a side span with a continuous T-shaped rigid framework. The bridge tower is a single tower with a height of 2.27 m The span is (40 + 94 + 220 + 94 + 20) m It is a continuous prestressed concrete double-tower cable-stayed bridge. With the development of society and economy, the increasing demand for bridge aesthetics will promote the construction of collaborative bridges with beautiful and unique shapes, good structural performance, and considerable economic benefits
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