Study On The Structural Behavior Of Steel-concrete Composite Girders Under The Effect Of Sunshine Temperature Field

The temperature field of composite structures of a bridge,could change due to various climate factors,in natural environment.Since the thermal conductivity of the concrete vary greatly both steel materials,steel girders in combination so that the lower bridge quickly under the action of sunlight converges at ambient temperature,the temperature change of the upper concrete panel is very slow,however,this will such that the combined structure of the temperature field generated gradient distribution.So that the temperature field of the composite structure produces a gradient distribution.This gradient distribution is not only in the vertical,but also with the bridge width and bridge length increases,the performance in the horizontal even along the bridge,and then produce the role of temperature stress.In this paper,the main line of a highway as the engineering background,analysis of its structure under the action of the temperature field,the main contents are as follows:(1)The thesis analyzes the distribution of the temperature stress and displacement of the composite beam across the neutral bearing section from four aspects:whether considering the nonlinear constitutive relation and whether or not considering the slip effect of the combined interface.(2)Based on the above analysis,the segmentation model considering the constitutive and slip effects of plastic damage is established.The stress and displacement of the bearing and the middle section are compared and analyzed under the vertical gradient temperature and space temperature field the distribution of the situation.(3)Analyze the distribution of temperature stress and displacement of the full bridge under the action of the linear elastic constitutive and plastic damage constitutive model,the vertical gradient temperature and the space temperature field,respectively,under the action of the temperature field,taking the slip effect separately considering the slip effect Happening.(4)Considering the effect of sunshine space temperature field,combined with the load(weight and vehicle load)of the composite beam bridge in the normal use stage,the steel-concrete composite beam bridge under normal elasticity constitutive and plastic damage The use of the role of space under the stress state.And then analysis of the various parts of the composite bridge of the force,deformation characteristics.