连续曲线梁桥横向抗震加固设计研究  

Study on Transverse Seismic Reinforcement Design of Continuous Curved Girder Bridge

作　　者：赵汗军 ZHAO Hanjun(Shanxi Jiaoke Highway Survey and Design Institute Co.,Ltd.,Taiyuan 030032,China)

机构地区：[1]山西交科公路勘察设计院有限公司,太原030032

出　　处：《交通科技》2023年第3期66-69,共4页Transportation Science & Technology

摘　　要：为提升曲线梁桥横桥向抗震性能,以某座非规则的三跨连续曲线梁桥为例,建立考虑挡块横向限位性能退化下不同盖梁挡块间隙、强度的全桥弹塑性三维数字时程分析模型。结果表明,考虑横向盖梁挡块限位性能退化的曲线梁桥结构模型,其罕遇地震时更接近实际,主梁和挡块位移与变形响应更大,下部结构弯矩响应峰值减小;盖梁挡块强度越大,对主梁和支座的限位效果越明显,但同时对盖梁抗力性能需求也越高,下部结构响应也会增加;合理的挡块间隙能够协调发挥挡块和支座各自性能。In order to improve the transverse seismic performance of a curved beam bridge,an irregular three-span continuous curved beam bridge is taken as the example.A three-dimensional digital time-history analysis model of the full bridge is established with different gap and strength of the cover beam baffle,considering the degradation of the transverse limiting performance of the baffle.The results show that the curvilinear beam bridge structure model considering the degradation of the limiting performance of the transverse cover beam retaining block is closer to the reality in rare earthquake,the displacement and deformation response of the main beam and retaining block is larger,and the peak response of the bending moment of the lower structure is reduced.The greater the strength of the cover block,the more obvious the limiting effect on the main beam and support,but at the same time,the higher the demand for the cover beam resistance performance,and the response of the substructure will also increase.Reasonable block clearance can coordinate the performance of block and support.In this paper,when the gap of the cover block is set at 25 mm to 50 mm and the strength is set at 20%~30%of the support reaction force,the whole structure can maintain a good cooperative working state in the earthquake.

关 键 词：曲线梁桥 盖梁挡块 时程分析 罕遇地震 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.21[交通运输工程—道路与铁道工程]