Simplified Calculation Methods Of Interlayer Stresses For STC Composite Bridge Deck Pavement

In order to study the simplified calculation method of interlayer stress of high-toughness concrete composite bridge deck pavement,ANSYS finite element analysis was used to explore the influence of steel-STC-SMA structural thickness,elastic modulus,ambient temperature,and bridge deck longitudinal slope on the interlayer stress.According to the law,an estimation model of interlayer stress of light composite bridge deck pavement is established,and simplified calculation formulas of maximum shear stress and maximum normal tensile stress between layers are proposed.This paper mainly completes the following work:(1)The interlayer design control index of the STC-surface layer of the high-toughness concrete composite bridge deck is proposed.Considering the time-temperature equivalent principle,the static analysis of the light composite bridge deck under different driving states of vehicles and the longitudinal slope of the bridge deck is carried out.force law.(2)Based on three typical steel box girder bridge deck systems,the finite element segment model of the “steel-STC-SMA” light composite bridge deck pavement system was established with the goal of controlling the structural damage between the pavement layers,taking the maximum interlayer shear stress and maximum normal tensile stress of the light composite bridge deck as the control index,carry out the orthogonal experimental design and finite element calculation of the relevant influencing factors,and obtain the orthogonal test results,that is,the finite element calculation of each index value.The orthogonal test data is processed by the range analysis method,and the influence degree and order of the key factors of the interlayer control index are obtained.(3)Based on the control variable method,the influencing factors of each control index are analyzed one by one,and the factors such as the interlayer stress of the combined bridge deck and the driving state of the vehicle,the longitudinal slope of the bridge deck,the thickness of the combined structure,the modulus of the surface layer,and the thickness of the steel plate are obtained.The internal relationship and change law.(4)Perform single factor regression on the influencing factors to obtain the relationship between each single factor and the maximum shear stress and maximum normal tensile stress between the layers of the light composite bridge deck;From the regression results,the stepwise regression method is used to screen the influencing factors and fit the numerical relationship to obtain the simplified calculation formulas of the maximum shear stress and the maximum normal tensile stress between the layers of the light composite bridge deck.(5)The simplified calculation formulas of the maximum shear stress and the maximum normal tensile stress between the layers of the light composite bridge deck are tested through reliability testing methods such as statistical testing,sampling testing,and experimental testing.The inspection results show that the regression effect of the simplified calculation formula is good;the error between the finite element simulation results obtained by sampling and the calculation value of the simplified formula is within 4%;the maximum shear stress and the maximum normal tensile stress between the layers of the light composite bridge deck are simplified The deviation between the calculation results of the calculation formula and the simulation results of the actual engineering finite element modeling is less than 8%.