连续曲线箱梁模型试验研究

A Model Experimental Study of the Continuous Curved Box Girder

建立一两跨连续曲线箱梁有机玻璃试验模型。二跨连续箱梁模型的跨径为45cm+45cm,分别进行了在集中荷载、均布荷载作用下的模型试验研究。垂直集中荷载采用杠杆法加载,均布荷载采用特制条形砝码搁置加载。采用YJ-25静态电阻应变仪、平衡箱,并用半桥测量,温度自补偿方法测定应变值。各种测试值均取分级荷载下读数的平均值,测量得到了沿横截面的应力、应变分布规律。用有限段法和有限元法对该模型进行了应力计算,与试验结果比较吻合较好,实验验证了理论的正确性。

A two-span continuous curved box girder model was made with Perspex. The span of the two-span continuous box girder model was 45cm＋45cm. Experimental studies were preformed with the model under vertical concentrated loading and vertical uniformly distributed loading respectively. Vertical concentrated load was applied through a lever system. Vertical distributed loads were applied with specially made standard strips of weights. Adopting the methods of semi-bridge measurement and temperature self-compensation, the strain values were measured by YJ-25 static resistance strain set, balance box, and all these data were the averages of the readings under different classified loadings. The distributions of stress and strain on cross section were obtained from the experiments. The experimental results were compared with the finite segment results and the finite element results. A good agreement is obtained. The accuracy of theory is verified by the experiments.