Study On Different Moduli Problems In Model Experiment Of Hinged Girder Bridge

Many tests and researches indicate that most of the engineering materials will display different tension and compression moduli elastic property as well as reinforced concrete, plastic, fiberglass, ceramic, graphite, and other compound materials and so on with varying degrees. Plexiglass is used for making the zoom-out models of bridge in the bridge structures, and doing loading trial for the models in order to reflect the mechanical properties of the bridge structure through analyzing the test data. Some researchers of the hinged girder bridge from the Chongqing Jiao tong university adopt the plexiglass to make the model and do the loading test using many working conditions. They analyze the elastic response of the girder bridge through the test data, and they employ the elastic theory with the same moduli to do theoretical analysis for the hinged girder bridge. Many tests show that plexiglass is a kind of material with different moduli and the character is obvious.This thesis uses the theory with different moduli to analyze the elastic effect of the bridge for the delegation of the research. We should know the tension and compression moduli in order to analyze the elastic effect of the hinged girder bridge, and the moduli must be the structure's not the calibration value. This text set out the tension and compression moduli of the plexiglass under the structure by means of loading trial for hinged girder bridge. The text gives a kind of method to determine the tension and compression moduli of the structure in a sense. We can adopt the theory with different moduli to do the analysis of the follow-up when we know the tension and compression moduli of the plexiglass, and do the contrastive analysis for the bridge's elastic response with the two kinds of elastic theory in order to give some consult for the researchers and the actual projects. Consequently, the research work of this text has significance.This text introduces the current situation of the study from home and abroad for the question with different tension and compression and its elastic theory, and use analytical methods and tentative means to investigate the different tension and compression moduli problems. The following problems were studied.â‘ Equivalent section method is used for solving the T-section beam. By the method we obtain the approximate analytical solutions of the T-section beam thus expanding the central range of application of the equivalent section method.â‘¡The tension and compression moduli and their ratios were detected for the weighted hinged girder bridge through test procedure under the theory with different moduli.â‘¢Calculation results of the stresses and displacements were contrastive analyzed under the classical elastic theory and the theory with different module by means of analyzing the elastic effect of the hinged girder bridge.