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采用加强固定盆式支座和墩柱强度的方法来强行保证大跨度连续梁桥在强震作用下的结构安全,固定墩会承受较大的地震力,由此导致设计的不经济性。针对上述现象,采用弹塑性减震耗能装置方案对强震区大跨连续梁桥进行减隔震设计。计算表明,通过合理设置装置的屈服力以及后屈曲刚度比,弹塑性减震耗能装置可以起到明显减小固定墩所受地震力、提高结构抗震性能的效果。对墩柱进行延性抗震设计,并分析比较不同因素对结构延性的影响。结果表明,考虑墩柱的延性可以有效降低墩柱底部弯矩。配箍率和轴压比对墩柱的延性系数影响较明显,而纵向主筋的配筋率减低,屈服和极限曲率均会降低,对延性系数的影响较小。
By strengthening the strength of fixed basin supports and pier columns, the structural safety of long-span continuous beam bridges under strong earthquake is forcibly guaranteed. The fixed piers will bear greater seismic forces, which leads to the uneconomical design. Aiming at the above phenomena, the elastic-plastic damping energy dissipation device scheme is adopted to reduce the seismic isolation of long-span continuous girder bridge in strong earthquake area. The calculation shows that by reasonably setting the yield strength of the device and the post-buckling stiffness ratio, the elastoplastic damping energy dissipation device can significantly reduce the seismic force on the fixed pier and improve the seismic performance of the structure. The ductile seismic design of the pier is analyzed and the influence of different factors on the ductility of the structure is analyzed and compared. The results show that considering the ductility of pier can effectively reduce the moment of pier bottom. The influence of the stirrup ratio and the axial compression ratio on the ductility coefficient of the pier is obvious, while the ratio of the reinforcement of the longitudinal reinforcement decreases, the yield and the ultimate curvature decrease, but the influence on the ductility coefficient is small.