GFRP桥面钢纵梁组合梁桥结构性能分析与研究-土木工专业毕业论文.docx

AbstractABSTRACT Abstract ABSTRACT The structural analysis and design of GFRP composite beam bridge composed of pultrusion GFRP composite deck and I-shaped steel longitudinal beam were researched in the serviceability limit state in this paper．By the theoretical deduce and structural finite element method analysis，the major design parameters of the composite beam bridge were obtained．Therefore，a simplified design method of GFRP composite beam bridge was presented and applied to the design ofmedium and short span bridges in China．The main research was as follows： 1．The design ofpultrusion GFRP composite deck Based on the Comparison of stiffness and strength of foreign various GFRP composite deck，the macro mechanical properties of pultrusion GFRP composite deck were researched．Firstly，the value of the equivalent mechanical parameters(such as the equivalent Yong’S modulus巨1，屹，岛3 in various direction，the shear modulus Gi 2，Gt]，G2]in different plane and Passions ratio V12、v13、v23 and SO on)were discussed with the deck being represented by an equivalent orthotropic plate． Secondly，the computing pattern ofpultrusion GFRP composite deck was determined． Finally，the transverse design deflection criterion and the design method of pultrusion GFRP composite deck were presented． 2．Spatial analysis ofGFRP composite beam bridge By the theoretical deduce and structural finite element method analysis，the transversal 1ive-load distrmution factor formula of GFRP composite beam bridge was put forward．ConsequentlN the problem about transversal internal force distribution of GFRP composite beam bridge Was settled． 3．Analysis on mechanical performance of GFRP composite beam After geamg the flexural moment on single composite beam by utilizing transversal five—load distribufion factor，the mechanical performance of GFRP composite beam was analyzed．The emphases were put on flange effective width of GFRP composite beam and the influence degree of slab—beam combined action on macro mechanical