大跨度连续梁桥延性和减隔震设计.pdf

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1、桥梁建设２０１６年第４６卷第３期（总第２３８期）９２BridgeConstruction，Vol．４６，No．３，２０１６（TotallyNo．２３８）文章编号：１００３－４７２２（２０１６）０３－００９２－０６大跨度连续梁桥延性和减隔震设计毛玉东，李建中（同济大学土木工程防灾国家重点实验室，上海２０００９２）摘要：为研究大跨度连续梁桥合理的抗震设计方法，以一座（１００＋１６０＋１００）m变截面连续梁桥为背景进行分析。采用动力非线性反应程序SAP２０００建立桥梁模型，选取６条实际地震动输入，比较利用桥

2、墩延性进行抗震设计、利用摆式支座进行减隔震设计（分别假设桥墩保持弹性和允许桥墩屈服）时桥梁的地震响应。结果表明：利用桥墩延性抗震设计可能导致固定墩较大的延性需求，从而导致桥墩严重损伤；采用减隔震设计要求桥墩保持弹性，可能导致桥墩较大的地震弯矩和剪力；采用减隔震设计容许桥墩进入延性，可有效减小桥墩的延性需求，从而控制固定墩的损伤。关键词：连续梁桥；大跨度梁桥；延性抗震设计；减隔震设计；桥墩屈服；抗震性能中图分类号：U４４８．２１５；U４４２．５５文献标志码：ADuctilityandSeismicMit

3、igationandIsolationDesignofLongSpanContinuousGirderBridgesMAOYudong，LIJianzhong‐‐（StateKeyLaboratoryforDisasterReductioninCivilEngineering，TongjiUniversity，Shanghai２０００９２，China）Abstract：Toinvestigatethereasonableseismicdesignstrategyforthelongspancontin

4、uousgirderbridges，anon‐uniformsectioncontinuousgirderbridgewithspanarrangement（１００＋１６０＋１００）mwascitedasanexampleandwasanalyzed．Themodelforthebridgewasestablished，usingthenonlineardynamicresponseprogramSAP２０００，６realgroundmotionswereselectedastheseis‐micin

5、putandtheseismicresponsesofthebridgeundertheseismicdesignusingthepierductilityandundertheseismicmitigationandisolationdesignusingthefrictionpendulumbearings（respec‐tivelyassumingthatthepiersremainedelasticandthepierswereallowedtoyield）werecompared．There

6、sultsrevealthattheseismicdesignusingthepierductilitymayresultinthegreatductilitydemandofthefixedpierandwillconsequentlycauseseveredamagetothepier．Theseismicmiti‐gationandisolationdesignrequiresthatthepiersshouldremainelastic，whichmaycausethepierstohavet

7、hegreatseismicmomentandshearforces．However，theusingoftheseismicmitigationandisolationdesignandtheallowanceofthepiersintotheductilitycaneffectivelyreducetheduc‐tilitydemandandcanconsequentlycontrolthedamagetothefixedpier．Keywords：continuousgirderbridge；l

8、ongspanbridge；ductilityseismicdesign；seismicmiti‐gationandisolationdesign；pieryield；seismicperformance1引言塑性变形，导致桥墩严重损伤，震后的修复工作困［１］大跨度连续梁桥在纵向地震荷载下，固定墩要难。中小跨度桥梁的墩身质量贡献较小可以忽略承受绝大部分上部结构传递下来的地震惯性力，利不计，墩底的地震弯矩和剪力主要由梁体传递的地用固定墩延性抗震时，墩底发生