依托桥墩台提高超载连续梁桥运行能力研究

Research on Improving Operation Capacity of Overloaded Continuous Beam Bridges Based on Piers or Abutments

到目前为止,世界许多国家的学者对桥梁振动控制和超载控制作了不少研究,提出了诸如TMD、MTMD等控制措施,这些研究对超载效应考虑不多。考虑从桥墩、桥台做液压伺服系统的斜向支撑,在离桥一定距离做称重系统和荷载传感系统,当有超重车载时,中央控制系统就发令液压伺服系统将需要的力施加到连续梁底,从而减少梁的内力和挠度。理论分析证明:该方法对连续梁具有显著的超载运营作用,且对三跨连续梁桥,只须从桥墩做斜撑,而对于两跨、四跨、五跨连续梁桥,从桥台做斜撑是有利的。

So far,a lot of research has been done in the field of bridge vibration control and overloading control,using TMD,MTMD and other control measures,but few of these researches consider the effect of overloading.In this paper,based on piers and abutments of the bridge,the intelligent braces that are mainly made of hydraulic servo system are fixed to work with the load weighting system and sensing system located a certain distance away from the bridge.When there are overweight vehicles,these systems controlled by the central control system can work together to make sure that the desired force act at the bottom of the bridge,thereby it can greatly reduce the internal force and the deflection of the bridge.Theoretical analysis shows that this method function properly when there are overweight vehicles on the continuous beam bridges,and to the three-span continuous beam bridge,the bracings based on the piers are enough,but to the two,four and five-span continuous beam bridge,the bracings based on the abutments are preferential.