潮白河大桥的结构体系与消能减震分析

Analysis of Structural System and Energy-dissipating and Shock-absorbing of Caobai River Bridge

京承高速公路潮白河大桥主桥为三塔部分斜拉桥,为了消除环境温度变化和混凝土收缩徐变的不利影响,采用中塔处塔梁墩固接、边塔和边墩处墩梁间纵向滑动的结构体系。该文讨论了潮白河大桥主桥的抗震性能,讨论了按照《公路工程抗震设计规范》(JTJ004-89)进行抗震设计的不足;根据结构体系的特点,提出在边塔墩与主梁之间设置流体粘滞阻尼器消能减震的方案,并通过分析确定了阻尼器的参数和布置。计算结果表明,流体粘滞阻尼器可以有效减小潮白河大桥的地震反应,提高结构的抗震能力和地震安全性。

The main bridge of Caobai River Bridge in Jingcheng Expressway is a three-pylon partial cable-stayed bridge. In order to eliminate the disadvantage influences of the surrounding temperature variety and the concrete shrinkage creep, the structural system of fixing the pylon, beam with pier at the middle pylon, and the longitudinal slipping between the pier and beam at the side pylon and side pier. The article discusses the anti-earthquake performance of the main bridge of Caobai River Bridge, and the shortage of the anti-shock design according to <<Highway Engineering Anti-earthquake Design Standard>> (JTJ Jie 004-89). Based on the characteristics of the structural system, the article puts forward the scheme of the fluid viscous damper installed between the side pylon pier and the main beam to dissipate the energy and absorb the shock, and defines the parameters and arrangement of damper by the analysis. The calculation result makes clearly that the damper can efficiently decrease the earthquake reaction of Caobai River Bridge and enhances the anti-earthquake capability and earthquake safety of the structure.