Effects of Solar Temperature Gradient on Long-Span Concrete Box Girder during Cantilever Construction

Xu-ming, Song; Melhem, Hani; Li, Jun; Xu, Qiang; Liao, Cheng

doi:10.1061/(asce)be.1943-5592.0000844

Cited by 34 publications

(17 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Solar shortwave radiation is divided into three categories: a direct solar radiation, a scattered radiation, and a reflection radiation. Since normal vectors of silo surface and ground surface are parallel to each other, the total solar radiation heat flux s obtained in the outer surface of silo can be expressed by [8,27] =…”

Section: Thermodynamic Analysis Theorymentioning

confidence: 99%

“…where s is the absorption of solar radiation; is the solar incident angle on the vertical surface [ ∘ ]; is the solar altitude angle [ ∘ ]; e is the ground short-wave reflectivity; 0 is the solar radiation intensity at the upper limit of the earth's atmosphere [W/m 2 ]; u is an atmospheric turbidity factor; a is relative atmospheric pressure; m is an atmospheric optical mass corrected by air pressure. According to Newton's Law of Cooling, the convective heat flux c between the surface and air can be calculated as [8,27] = ℎ ( − )…”

Section: Thermodynamic Analysis Theorymentioning

confidence: 99%

“…where a is the air temperature [ ∘ C] and ℎ c is the convective heat transfer coefficient. The heat flux of the radiative heat transfer r can be obtained as [8,27]…”

Section: Thermodynamic Analysis Theorymentioning

confidence: 99%

“…Therefore, a surface comprehensive heat transfer coefficient is adopted for the convective heat and the radiative heat transfer. Thus, the boundary conditions are as follows [8]:…”

Section: Thermodynamic Analysis Theorymentioning

confidence: 99%

“…Previous studies on the non-uniform temperature field mainly focused on the temperature effects of bridges [5][6][7][8]. Few studies were conducted to evaluate the steel silos under solar radiation [9,10].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation on the Non-Uniform Temperature Distribution of Large-Diameter Concrete Silos under Solar Radiation

Zhao

Yang

Wang

2018

Mathematical Problems in Engineering

View full text Add to dashboard Cite

There is a growing demand for silos with large diameters and volumes; hence, the stresses induced by the temperature differences between the inner and the outer surfaces of the concrete walls of the large silos become significant. Sunshine is the main source of the temperature differences; and it is necessary to investigate the influences of sunshine on large concrete silos and ensure their safety and durability. In this paper, the temperature distribution of a concrete silo exposed to the sunshine was measured on site. A finite element (FE) model was built to analyze the temperature distribution under the sunshine, and the FE model was validated by comparing the yielded temperature field with that obtained on site. Based on the temperature field yielded in the FE model, the internal forces of the silo were determined by performing a structural analysis. After that, the FE model was extended and used for a parametrical study, and the influences induced by the factors like meteorological parameters, dimension of silos, and reference temperature on the temperature effects of the silo were investigated. The simulation results showed that the temperature gradient exhibited significant nonlinearities along the wall thickness. The performance of a steady-state analytical method was evaluated, which is conventionally used for the design of silos. It was found that, for the silos with the thicknesses of more than 30 centimeters, the steady-state method overestimated the temperature effects. It is suggested here that nonlinear temperature gradients should be employed for considering the temperature effects of large silos.

show abstract

Section: Thermodynamic Analysis Theorymentioning

confidence: 99%

Section: Thermodynamic Analysis Theorymentioning

confidence: 99%

“…where a is the air temperature [ ∘ C] and ℎ c is the convective heat transfer coefficient. The heat flux of the radiative heat transfer r can be obtained as [8,27]…”

Section: Thermodynamic Analysis Theorymentioning

confidence: 99%

“…Therefore, a surface comprehensive heat transfer coefficient is adopted for the convective heat and the radiative heat transfer. Thus, the boundary conditions are as follows [8]:…”

Section: Thermodynamic Analysis Theorymentioning

confidence: 99%