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文章以高烈度地区某6孔40m高墩T形梁桥为例,分别采用普通层叠橡胶支座、高阻尼层叠橡胶支座及铅芯橡胶支座进行减震分析。时程分析结果表明3种支座都能延长桥梁结构自振周期,减轻地震响应。虽然采用3种支座桥梁结构都未能有效避开2类场地卓越振动周期,但铅芯橡胶支座的高阻尼特性有效的吸收了地震能量,减轻了地震响应,具有较强的减震性能,适用于高烈度地区桥梁设计。
Taking a 6-hole 40m high pier T-shaped girder bridge in high intensity area as an example, the paper analyzes the shock absorption of ordinary laminated rubber bearing, high damping laminated rubber bearing and lead rubber bearing respectively. The results of time history analysis show that all three kinds of bearings can prolong the natural period of bridge structure and reduce the seismic response. Although none of the three types of bearing bridge structures can effectively avoid the excellent vibration period of the two kinds of sites, the high damping characteristic of the lead-rubber bearing effectively absorbs the seismic energy, reduces the seismic response and has strong shock absorption performance , Suitable for high intensity area bridge design.