The Research On Temperature Effect Of Long-span Reinforced Concrete Box Arch In Cold Region

Concrete is one of the most widely used materials in bridge engineering.Due tothe concrete itself is the thermal inertia material, so the concrete bridge structure willproduce nonlinear temperature field under the sunshine.The uneven temperaturechange can produce enough temperature stress to make inside the structure ofconcrete cracking.more and more scholars have begun to pay attention to the potentialthreats by The temperature effect of bridge engineering.Although scholars at home and abroad temperature effect of bridge structure iscarried out extensive research, but for the temperature effect of arch ring problemresearch is less.The temperature gradient model of concrete arch bridge is not definedin related standards in our country. In this article, composite some scholars at homeand abroad paper and the research achievements, on the basis of the temperatureeffect of cold region concrete bridge arch ring is studied and discussed in this paper.This paper focuses on the effect of long-span reinforced concrete box arch incold region.mainly introduces the basic fundamentals about the effect of long-spanreinforced concrete box arch in cold region.bases on heat transfer, astronomymeteorology and other disciplines,comprehensive consideration of variousfactors.According to the third kind boundary condition to calculate the different partsof the solar radiation intensity.through the analysis of the measured data,Finds out thearch to the most severely affected in the sunny and cloudless day, Under suchconditions arch temperature change trend and theoretical analysis of most similar Thetemperature change trend of different parts is different. The temperature is relativelyactive under the direct radiation of the sun,but the change trend lags behind thetemperature of the atmosphere,And the relatively closed space temperature changes isrelatively flat, such as the internal web of the box.With the the application of the finiteelement software of ABAQUS to the whole bridge temperature-displacementcoupling simulation to make a comparative analysis on the simulated data andmeasured data to assist data analysis.Finally, the thesis analyzes the parameters of thermal sensitivity which influence of the temperature field with the finite elementsoftware.Different parameters are calculated in the same model for the different dataanalysis,find out the main factor of the temperature field in concrete is fromenvironmental factor, and the influence of specific heat and heat conductioncoefficient is extremely small.Through the collation and analysis of data show that thethird kind boundary condition basically accord with the actual situation, calculationmethods also have a certain feasibility, and measured data can provide a reference forthe future research on the temperature effect of arch.