潭溪山景观人行桥施工技术与健康监测

Construction Technique and Health Monitoring for Tanxi Mountain Landscape Pedestrian Bridge

潭溪山景观人行桥为单斜面索拱支承曲线人行桥,采用地面叠置拼装、滑移就位、二次旋转后张拉的施工工艺。为了满足大客流人致振动的舒适度,设置了TMD阻尼器,并采用结构健康监测长期监控人行桥的索力和竖向加速度。研究表明,合理的施工和监控方法实现了桥梁在恶劣场地条件下的顺利施工,结构监测结果表明TMD有效减轻了结构振动。

The landscape pedestrian bridge of Tanxi Mountain is a curved footbridge supported by single inclined cable arch. The arch and the girder were firstly superpositioned together and then slid in place. Two rotation operations were performed for the girder and the arch, respectively and finally tensioning process was carried out to lead to rational pretension state. In order to satisfy the comfort of human-induced vibration of large passenger flow, TMD dampers were set, and the cable forces and accelerations of the footbridge were monitored by a structural health monitoring system. The study shows that the reasonable construction and monitoring method can realize the smooth construction of the bridge under the harsh site conditions, and the results of structural monitoring show that TMD can effectively reduce the structural vibration.