16m低高度钢筋混凝土T梁单线铁路桥动力性能试验研究

Study of Dynamic Behavior of Single-track Railway Bridges with 16-m Low-height Reinforced Concert T-beams

低高度钢筋混凝土T梁建筑高度低,能节省较多的工程建设费用,但在实际应用中逐步显露出刚度过低问题。为了研究16 m低高度T梁桥的运营状况、安全性和加固对策,选取某桥二孔进行低高度T梁挠度、振幅和加速度等主要动力性能测试,发现桥跨及桥墩横向刚度较低,需采取适当加固、补修措施,提高横向刚度。

Owing to the lower construction cost of low-height reinforced concrete T-beams, they used to be widely used in railway bridges. But with the development of the cause of railway transportation, low height reinforced concert T-beams begin to show their shortcoming of insufficient rigidity gradually. To study the operating behavior, safety of and strengthening measures for low-height T-beam bridges, two spans of 16-m low-height reinforced concert T-beams of a ceratin bridge are tested to find their haajor dynamic behavior of natural deflection, vibration amplitude and acceleration. The results of the test show that the lateral rigidity of the beams and piers is not sufficient, owing to which reinforcing and repairing measures should be taken to improve the lateral rigidity of the beams and piers.