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随着公路桥梁的建设和隔震技术的发展,近断层隔震桥梁的抗震性能研究十分必要。该文以一座4跨连续梁桥为例,通过非线性时程的方法,探讨了连续梁桥在近场地震作用下桥梁的减隔震特性及参数变化规律,分析研究结果表明:采用隔震技术后,在近场地震作用下仍具有有效的减震效果;墩底弯矩随支座半径的增加而减小,支座位移随支座半径的增加而增加;存在某个特定的摩擦系数μ使墩底弯矩最小,墩顶支座位移随摩擦系数μ的增加而减小,一定程度不太敏感。
With the construction of highway bridges and the development of isolation technology, the seismic performance research of near-fault isolated bridges is very necessary. Taking a 4-span continuous girder bridge as an example, the seismic isolation characteristics and parameter variation of the bridge subjected to near-field earthquake are studied by means of nonlinear time-history method. The results show that: Technology, it still has an effective damping effect under the action of near-field earthquakes. The bending moment at the pier bottom decreases with the increase of bearing radius, and the bearing displacement increases with the increase of bearing radius. There is a certain friction coefficient μ makes the minimum bending moment at the bottom of the pier, and the displacement of the abutment on the pier decreases with the increase of the friction coefficient μ, to a certain extent, less sensitive.