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厦门市BRT(Bus Rapid Transit)莲坂站台钢构组合体人行扶梯在行人通过时有较为明显的晃动,经有限元分析,结合现场实测,该结构在特殊情况下的竖向基频低于规范要求的3Hz。为了改善该结构的动力特性,通过理论分析及Midas全三维仿真分析,找到了该结构体舒适度不足的原因,并提出了在原结构的基础上,于主桁下直接焊接槽型钢的加固方法。通过加固后,行人已不会感到明显晃动,站台工作人员反映效果良好,复测数据与理论值相吻合,有效提高了结构体的舒适度。所设计的方案简单易行,对站台整体外观影响微小,可有效减小人行结构体的晃动,可为同类工程提供借鉴。
Xiamen BRT (Bus Rapid Transit) Liangban platform steel structure of the escalator in the pedestrian passage there is more obvious shaking, the finite element analysis, combined with field measurements, the structure under special circumstances, the vertical base frequency is lower than the standard requirements Of 3Hz. In order to improve the dynamic characteristics of the structure, the reasons for the lack of comfort of the structure were found through theoretical analysis and full three-dimensional simulation analysis of Midas, and the reinforcement method of direct welding grooved steel under the main girder was proposed based on the original structure. After the reinforcement, pedestrians will not feel obvious sloshing, the platform staff reflect the good results, and the retest data are consistent with the theoretical values, which effectively improves the comfort of the structure. The designed scheme is simple and easy, and has little influence on the overall appearance of the platform, which can effectively reduce the shaking of the pedestrian structure and provide reference for similar projects.