混凝土曲线梁桥双向规则性判别参数影响分析探讨
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摘要
为给我国桥梁抗震设计规范的修订提供参考资料,从抗震设计反应谱理论角度,通过改变地震动的输入方向,引入抗侧力桥墩的"相对墩底剪力比"参数来判别混凝土曲线梁桥的双向规则性,探讨了圆心角、曲线半径、跨径、跨宽比和跨高比等结构参数变化对混凝土曲线梁桥横桥向和纵桥向规则性地震行为的影响规律。研究表明:圆心角是影响混凝土曲线梁桥双向规则性的主要因素,而跨径、跨宽比和跨高比等参数的影响可以忽略,曲线半径不应作为定义规则曲线梁桥的参数;曲线梁桥当满足单跨圆心角φ小于35°,且多跨一联累计圆心角ψ小于55°时具有双向规则性,规则曲线梁桥的地震力可比拟为等参的直线桥进行简化抗震计算,计算结果偏于保守。
Aimed at providing references for Chinese seismic design code revision,from seismic design response spectrum theory of view,by changing input direction of ground motion," relative pier shear ratio " parameter of resist lateral force piers is introducied to judge concrete curve girder bridge ’ s bidirectional directions regularity.This study conducts structure parameters change affecting the lateral and longitudinal regularity seismic behavior of concrete curve girger bridge,such as central angle,curve radius,span,the span-width ratio and span-height ratio parameter.etc.Research shows : Central angle parameter is the major factor affecting the bidirectional regularity of concrete curve girder bridge,while the influences by span,span-width ratio and span-height ratio parameters can be ignored;Curve radius should not be used to define regular curve girder bridge as one parameter;As a curve girder bridge meets the central angle φ less than 35degrees,meanwhile the accumulative total of central angle of multispans ψ less than 55degrees,It satisfies bidirectional regularity,so it can be analyzed by simplified antiseismic calculations according to the same parameters straight beam bridge,the calculated result tends to be conservative.
Aimed at providing references for Chinese seismic design code revision,from seismic design response spectrum theory of view,by changing input direction of ground motion," relative pier shear ratio " parameter of resist lateral force piers is introducied to judge concrete curve girder bridge ’ s bidirectional directions regularity.This study conducts structure parameters change affecting the lateral and longitudinal regularity seismic behavior of concrete curve girger bridge,such as central angle,curve radius,span,the span-width ratio and span-height ratio parameter.etc.Research shows : Central angle parameter is the major factor affecting the bidirectional regularity of concrete curve girder bridge,while the influences by span,span-width ratio and span-height ratio parameters can be ignored;Curve radius should not be used to define regular curve girder bridge as one parameter;As a curve girder bridge meets the central angle φ less than 35degrees,meanwhile the accumulative total of central angle of multispans ψ less than 55degrees,It satisfies bidirectional regularity,so it can be analyzed by simplified antiseismic calculations according to the same parameters straight beam bridge,the calculated result tends to be conservative.
引文
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[3]BRIDGE MANUAL SECTION5 EARTHQUAKERESISTANT DESIGN[S].
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[5]AASHTO Guide Specifications for LRFD SeismicBridge Design.Subcommittee for Seismic Effects onBridges T-3[S].
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[7]RayW Clough,Joseph Penzien.Dynamics of Struc-tures[J].McGraw Hill BookCo,1993.
[8]Anil K Chopra.Dynamics of Structures[R].PrinceHall,200l.
[9]Edward L WiIson.Three-dimensional static and dy-namics analysis of structures-A physical approachwith emphasis on earthquake engineering Computerand structures[J].inc Berkeley California,2002.
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[11]Calvi G M,A.Pavese Conceptual design of isolationsystems for bridge structures[J].Journal of Eart-hquake Engineering,1997,1(1).
[12]Chopra A K.Modal pushover analysis procedure toestimate seismic demands for buildings:theory andpreliminary evaluation[R].Pacific Earthquake Engi-neering Research Center,200l.
[13]陈亮.规则桥梁划分标准与简化分析方法[D].上海:同济大学,2005.
[14]Tatjana Isakovic.Regularity indices for bridge struc-tures[C]//12th World Conference on Earthquake En-gineering,2000.
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[18]金菊,王淑涛.中小跨径曲线梁桥半径变化对结构变形的影响分析[J].河北工业大学学报,2007,36(4):110-113.
[19]孙颖.混凝土曲线梁桥简化抗震设计方法研究[D].福州:福州大学,2010.
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