Research On Temperature Influence And Design Parameter Adjustment Of Continuous Rigid Frame Bridge

Along with the augment of bridge span recently, construction control became more vital and attentional. Up to date theory and means of construction control is researched by construction monitor and control of Yi-li river long span bridge in Xin-jiang province.Construction control of bridge consists of the control of structural alignment and structural stress. They have the same importance in construction control. in order to get ideal goal we must enforce all-around control in procession of construction. in this paper we introduce the content and method of construction systematically, and analyze the computation method of bridge structure in construction control. firstly, we erected structural simulation model of the bridge, and selected rational influence factors, which include parametric recognition of structure, construction technology, method of construction monitor, temperature effect, modulus of elasticity of concrete and contract and creep effect etc, and the alignment and stress of the bridge were adjusted unceasingly by monitor, feedback, and forecast during construction, at last, we got the preplanned goal, according to the property of long span PC bridge with rigid frame-continuous girders, we go about the parametric estimation and feedback control by establishing discrete simulation model and utilizing least square method. We used the analytic software ANSYS,GQJS in simulation computation of the process of construction of Yi-li long span bridge, and combining software MATLAB we adjusted structural design parameter in process of construction.In the chapter of engineering application, we elaborate the influence of temperature difference in structure, as well as the recognition and adjustment of structural condition parameter.Temperature includes two aspect content, one is temperature stress of itself, the other is temperature secondary stress,. In concrete structure, due to coefficient of conduction for concrete is small, when external environment changes sharply, the change for internal temperature has distinct hysteresis. in construction of Yi-li river long span bridge, we thoroughly analyze structural deflection and stress before the folding posed by temperature difference, as well as that after the folding.Parametric deviation is one of the important factors that poses construction deviation of long span bridge, the change for structure parameter can result in the change of internal force and shape of structure, therefore, we must carry through recognition and adjustment of structure parameter in the construction control of long span bridge, firstly, we should find out the main design parameter, according to least square method and multiple linear regression, and resort to the computation software MAT LAB, then we can get the parametric error estimation value, finally, we use the adjusted parameter to analyze the structure through upright method and upside-down mounting method, then get the new deviation and stress of every construction state.