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曲线桥梁以其线型优美、适应复杂地形要求等诸多优点,备受设计者青睐。由于其几何线型的不规则性,在地震作用下墩柱处于压-弯-剪-扭耦合的复杂受力状态,而现阶段国内外抗震规范中仅以直线桥作为参考对曲线桥梁的墩柱进行抗震设计,不能完全反映耦合受力特点,因而造成桥梁抗震性能不能准确评估。为解决这一问题,本文以小半径曲线匝道桥钢筋混凝土圆形墩柱为研究对象(曲率半径小于90m、桥面宽6~10m、桥墩剪跨比大于4),针对地震作用下墩柱弯扭耦合引起的弯曲破坏问题,设计了2根试验墩柱,并采用拟静力试验对其抗震性能进行了研究。
Curved bridge with its graceful line to adapt to the requirements of complex terrains and many other advantages, much designers favor. Because of its geometric linear irregularity, the pier is under the complex stress state of pressure-bend-shear-torsion coupling under the action of earthquake. At present, only the straight-line bridge is used as reference to the curve bridge pier Seismic design of the column can not fully reflect the coupling force characteristics, resulting in the seismic performance of the bridge can not be accurately assessed. In order to solve this problem, this paper takes the small radius curve circular ramp reinforced concrete circular column as the research object (radius of curvature less than 90m, deck width 6 ~ 10m, pier shear span ratio greater than 4) Torsional coupling caused by bending failure problem, designed two experimental pier, and the quasi-static test of its seismic performance were studied.