桥梁顺桥向抗震减震措施研究
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摘要
针对某倒虹吸跨河大桥抗震问题 ,对聚四氟乙烯滑板支座、铅芯—橡胶支座和液体粘滞阻尼器三种减震方案与原设计板式橡胶支座结构顺桥向减震效果进行了对比分析研究 ,提出了 k=1.5 k N/ mm、μ=0 .2 5的GZY30 0型铅芯—橡胶支座减震方案为减震结构推荐方案。该推荐结构平均地震响应比原设计降低了 5 4 .3% ,减震效果显著。采取减震措施的桥梁及其倒虹吸钢管在地震作用下相当于设计烈度降低一度。
By comparing three shock absorption measures, such as polyvingl fluoride plate, lead rubber and liquid voscous damper with rubber plate bearing which is adopted in a certain inverted siphon bridge, shock absorption effect in axial direction is analyzed emphatically in this paper Shock absorption structure with GZY300 lead rubber bearing ( k =1 5kN/mm? μ =0 25) is rationally suggested Thus, shock absorption effect of the structure is very significant, it may make a 54 3% reduction in the earthquake responses, and one degree of seismic degree for design in bridges and inverted siphons.
By comparing three shock absorption measures, such as polyvingl fluoride plate, lead rubber and liquid voscous damper with rubber plate bearing which is adopted in a certain inverted siphon bridge, shock absorption effect in axial direction is analyzed emphatically in this paper Shock absorption structure with GZY300 lead rubber bearing ( k =1 5kN/mm? μ =0 25) is rationally suggested Thus, shock absorption effect of the structure is very significant, it may make a 54 3% reduction in the earthquake responses, and one degree of seismic degree for design in bridges and inverted siphons.
引文
[1] JTJ004-89,公路工程抗震设计规范[S].
[2] 何度心,等.桥梁抗震计算[M].北京:地震出版社,1991
[2] 何度心,等.桥梁抗震计算[M].北京:地震出版社,1991
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