Abstract
At present, there are few studies on the thermal effect of solar radiation on a separated double-sided box steel-concrete composite girder cable-stayed bridge. In this paper, the beam element and mixed element models are combined with the theory of transient heat transfer analysis and meteorology; this approach is adopted to carry out a thermodynamic analysis of a related bridge project. The calculation results of the thermal field and structural thermodynamic analysis of bridge sections show that, in terms of a separated double-sided box steel-concrete composite girder cable-stayed bridge, the thermal field distributions of the main girder and the pylons are extremely complex under conditions of solar radiation. Therefore, the real thermal field cannot be accurately described as a one-dimensional temperature gradient. The traditional beam element model cannot accurately simulate the temperature effect, and it will underestimate its thermal effect. The calculated temperature stress values of the mixed element model are quite different from those of the of beam element model. The mixed element model can precisely reflect the local thermal effect of each component in this system under solar radiation. Compared with the calculation results of the beam element model, the maximum temperature stress of the bridge deck in each section of the main girder is generally 20% larger; the maximum temperature stress levels of the steel-beam top and bottom plates are 14.7 MPa and 15.9 MPa larger, respectively. The maximum shear stress of the steel-concrete interface is 0.2 MPa larger. The research results of the temperature effect calculated by the mixed element have an important guiding significance for the design and maintenance of bridges.
Highlights
Cable-stayed bridges with steel-concrete composite girders have been widely used in modern long span bridge design and construction [1, 2]. e separated side-box cross section has multiple advantages, such as excellent stability during construction and convenience in terms of setting up the steel anchor box and maintaining it [1].In recent years, some scholars have researched the distribution of a thermal field and conducted various analyses of the thermal effect created by solar radiation
Wang [6] analyzed the thermal field of the main girders, main pylons, and stay cables of a doublebeam steel-concrete composite cable-stayed bridge under solar radiation according to the basic theories of meteorology and heat transfer theory and fitted the maximum temperature gradient mode of each component section
In the finite element model, the deployment of temperature observation points of the pylons and of the main girder are shown in Figure 8, including 4 temperature observation points on the pylons and 26 temperature observation points on the main girder. e bridge deck and steel box top plate shared the temperature observation points at GT9-GT11 and GT14-GT16
Summary
Cable-stayed bridges with steel-concrete composite girders have been widely used in modern long span bridge design and construction [1, 2]. e separated side-box cross section has multiple advantages, such as excellent stability during construction and convenience in terms of setting up the steel anchor box and maintaining it [1]. Wang [6] analyzed the thermal field of the main girders, main pylons, and stay cables of a doublebeam steel-concrete composite cable-stayed bridge under solar radiation according to the basic theories of meteorology and heat transfer theory and fitted the maximum temperature gradient mode of each component section. It is important to conduct research using the mixed elements’ model on the thermal effect of solar radiation on a cable-stayed bridge with separated side-box steel-concrete composite girders. Where λ is the thermal conductivity of the material, zT/zn is the temperature variation rate along the normal direction of the boundary Γ, h is the general convective heat transfer coefficient, Ta is the atmospheric temperature of the environment, T is the surface temperature of the structure which contacts the air, qs is the heat flux of shortwave radiation, which is absorbed by the structural surface, and qra is a subitem of qr. + 2 Ta, max − Ta, minsin 12 , where Ta, max and Ta, min are the maximum temperature and minimum temperature, respectively
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