高速铁路大跨连续梁-拱组合结构抗震性能研究

大跨连续梁拱组合结构在高烈度震区固定墩设计困难,伴随着大跨连续梁拱组合结构的大量建设,研究其在地震高烈度区的抗震性能具有重要工程应用价值。以一座跨度(110+228+110) m大跨连续梁拱组合结构为背景,为解决其固定墩设计困难的问题,采用普通支座体系、速度锁定器体系、黏滞阻尼器体系、双曲面减隔震支座体系4种不同的抗震方案进行比选分析,分析研究表明采用双曲面减隔震支座优势明显。同时又进一步进行了双曲面减隔震支座参数设计,其在强震作用下减隔震率超过60%,减隔震效果明显。综上可以看出,在强震作用下,大跨连续梁拱组合结构采用双曲面减隔震支座后,可有效降低纵桥向固定墩和横桥向各墩的地震响应,有效防止强震作用下结构的破坏,为结构优化带来较大空间。

Seismic Performance Analysis of Long-span Continuous Beam-Arch Composite Structure for High-speed Railway

It is difficult to design fixed piers for long-span continuous beam-arch composite structures in high seismic intensity areas. With the construction of large-span continuous beam-arch composite structures, it is of great engineering value to study their seismic performance in high seismic intensity areas. Based on the background of a long-span(110+228+110) m continuous beam-arch composite structure in engineering, four different aseismic schemes of ordinary bearing system, velocity lock-in system, viscous damper system and hyperboloid isolation bearing system are compared and analyzed to solve the difficulties in the design of its fixed piers. The analysis shows that the hyperboloid bearing has obvious advantages and the parameters of the hyperboloid isolation bearing are further designed. Under strong earthquake, the isolation ratio of the hyperboloid isolation bearing is more than 60%, and the effect of isolation is obvious. In summary, it can be seen that under strong earthquakes, the seismic response of longitudinal fixed piers and transverse piers of long-span continuous beam-arch composite structures can be effectively reduced by using hyperboloid seismic isolation bearings, and the structural damage under strong earthquakes can be effectively prevented, thus bringing more space for structural optimization.