V形刚构拱组合桥的梁拱组合效应分析

Analysis of Combination Effect of Beam-arch of V-shaped Rigid-frame and Arch Structure Combined Bridge

研究目的:大跨度V形刚构拱组合桥利用V形连续刚构的主跨斜腿与钢管混凝土拱的拱座连接形成,具有拱和V形连续刚构共同受力的特点,其结构性能已不同于一般的梁拱组合体系桥。通过本研究,揭示V形刚构拱组合桥的梁拱组合效应。研究结论:由于拱肋对V形连续刚构桥的加劲作用,V形刚构拱组合桥中跨在活载作用下的最大弯矩和最大挠度均减小约50%;组合结构桥由于混凝土收缩徐变引起的中跨后期下挠仅为V形连续刚构桥跨中下挠量的12%;V形刚构拱组合桥的竖向刚度是V形连续刚构桥的2.56倍以上,V形刚构拱组合桥的梁拱组合效应非常明显。

Research purposes： The V -shaped rigid -frame and arch structure combined bridge is formed by connection of slant legs of main span of V - shaped pier continuous rigid - frame with the arch abutment of concrete - filled steel tube arch. It has the feature that the and its performance of the structure is differen reveal the combination effect of beam - arch of arch and V -shaped t from general beam the combined bridge. pier continuous rigid - frame bear the load together -arch combined bridge. The research is done toResearch conclusions： Because of the enforcement effect of arch rib on V - shaped pier continuous rigid - frame, the maximum bending moment and deflection of the middle span of rigid - frame and arch structure combined bridge under effect of the active load decrease by 50%, the deflection of the middle span caused by the concrete creeping and shrinkage in the later stage is 12% of V - shaped pier rigid - frame bridge and the vertical stiffness of V - shaped frame and arch structure combined bridge is 2.56 trimes of V -shaped rigid -frame bridge, so the combination rigid - effect of the beam- arch of V- shaped rigid- frame and arch structure combined bridge is very obvious.