跨坐式单轨交通预应力钢筋混凝土轨道梁动力性能试验与分析

对重庆跨坐式单轨交通的预应力钢筋混凝土轨道梁、墩体结构进行了动力试验,测试其动力特性及在不同行车速度下的动力响应.测试及分析结果表明,预应力钢筋混凝土轨道梁结构实测自振特性与理论计算结果基本相符;轨道梁结构具有较好的竖向刚度和结构强度;单轨车辆以不同速度通过桥梁时,试验梁横向基频、横向加速度等横向振动性能与<铁路桥梁检定规范>的要求有一定差异;运行单轨车辆对轨道梁结构有一定的冲击作用,但不显著;墩体结构横向动力性能良好,满足限值要求.

Dynamic Characteristics of PC Rail Beam of straddle-type Monorail Transportation

Dynamic loading tests are carried out over the PC rail beams and piers of Chongqing straddle-type monorail transportation,the natural vibration characteristics and dynamic responses of the beams and piers under the dynamic loads at different train speeds are tested.The results indicate that the dynamic characteristics of PC rail beams matched well with the theoretical calculation,the beams are of good vertical rigidity and structural strength.When train passes at different speeds,the test also demonstrates certain differences between the transverse frequency,the transverse acceleration of the beam and the safety requirements of the Code for Examining Railway Bridges.The authors argue,though the passing train has some impact on the beams,the transverse vibration characteristics of the piers could satisfy the Code.