罕台川特大桥优化设计
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摘要
罕台川特大桥跨越罕台川,同时上跨包神和包西2条电气化铁路。为了解决该桥原设计(三跨连续梁)存在的分段悬浇施工周期长、对铁路的运营干扰大,大直径长桩成孔困难、工期长且桩质量不易得到保证,实体墩自重大、不利于抗震、承载力要求高等问题,对原设计做了如下优化:将中跨跨中35 m梁段改为钢-混结合梁,采用工厂化制作、现场吊装法施工;将实心墩改为矩形空心墩(主桥)及双方柱框架墩(引桥)。对优化后的桥梁结构进行地震作用下墩底内力计算及地震作用动力弹塑性验算,结果表明,按照承载能力极限状态基本组合计算的桥墩承载力和稳定性均满足要求,桥梁结构满足抗震规范要求。
The Hantaichuan River Bridge spans the Hantaichuan River and also two electrified railways from Baotou to Shenmu and from Baotou to Xi'an.To resolve the problems in the original design(a 3-span continuous girder) of the bridge,such as the long construction cycle of cantilever segmental concreting of the girder and the considerable interference of the construction with operation of the railways;the difficult boring of large diameter and long piles for the foundations,the long construction time schedule and the uneasy guarantee of quality of the piles;the heavy weight,unfavorable seismic resistance and demanding bearing capacity of the solid piers,the original design was therefore optimized as follows: the 35 m long girder section at the midspan of the central span was changed into a steel and concrete composite girder section which would be fabricated in shop,lifted and installed in field.The solid piers were changed into the rectangular hollow piers(for the main bridge) and double square column frame piers(for the approach bridges).The internal forces in the pier footings of the optimized structure under the action of earthquake were calculated and the dynamic elasticity and plasticity of the structure were checked.The results of the calculation and checking indicate that the calculation of the bearing capacity and stability of the piers in accordance with the basic combination of ultimate state of the bearing capacity can accord with the relevant requirements and the structure can satisfy the requirements for seismic resistance as well.
The Hantaichuan River Bridge spans the Hantaichuan River and also two electrified railways from Baotou to Shenmu and from Baotou to Xi'an.To resolve the problems in the original design(a 3-span continuous girder) of the bridge,such as the long construction cycle of cantilever segmental concreting of the girder and the considerable interference of the construction with operation of the railways;the difficult boring of large diameter and long piles for the foundations,the long construction time schedule and the uneasy guarantee of quality of the piles;the heavy weight,unfavorable seismic resistance and demanding bearing capacity of the solid piers,the original design was therefore optimized as follows: the 35 m long girder section at the midspan of the central span was changed into a steel and concrete composite girder section which would be fabricated in shop,lifted and installed in field.The solid piers were changed into the rectangular hollow piers(for the main bridge) and double square column frame piers(for the approach bridges).The internal forces in the pier footings of the optimized structure under the action of earthquake were calculated and the dynamic elasticity and plasticity of the structure were checked.The results of the calculation and checking indicate that the calculation of the bearing capacity and stability of the piers in accordance with the basic combination of ultimate state of the bearing capacity can accord with the relevant requirements and the structure can satisfy the requirements for seismic resistance as well.
引文
[1]JTJ/T B02-01-2008,公路桥梁抗震设计细则[S].(JTJ/T B02-01-2008,Guidelines for Seismic Design of High-way Bridges[S].)
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[3]纪诚,黄晓东,刘钊,等.南京市三山桥设计研究[J].世界桥梁,2009,(3):12-14.(JI Cheng,HUANG Xiao-dong,LI U Zhao,et al.Study ofDesign of Sanshan Bridge in Nanjing City[J].World Bridges,2009,(3):12-14.in Chinese)
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[5]周泳涛,刘延芳,鲍卫刚.新、旧桥梁抗震设计规范实桥计算比较[J].世界桥梁,2010,(3):28-30.(ZHOU Yong-tao,LI U Yan-fang,BAO Wei-gang.CalculationComparison of a Practical Bridge According to New and OldBridge Seismic Design Specifications[J].World Bridges,2010,(3):28-30.in Chinese)
[6]王克海,李茜,朱②,等.桥梁工程抗震设防标准问题[J].桥梁建设,2008,(2):63-65.(WANG Ke-hai,LI Qian,ZHU Xi,et al.Issues on Earth-quake Protection Criterion for Bridge Engineering[J].BridgeConstruction,2008,(2):63-65.in Chinese)
[7]周世清.大跨度连续组合梁桥施工质量的监理控制[J].世界桥梁,2009,(1):74-76.(ZHOUShi-qing.Supervision Control of Construction Qualityof Long Span Composite Continuous Box Girder Bridge[J].World Bridges,2009,(1):74-76.in Chinese)
[8]李龙安,何友娣,屈爱平.公路桥梁抗震设计的设防标准研究[J].桥梁建设,2006,(S2):135-139.(LI Long-an,HE You-di,QU Ai-ping.Study of ProtectionCriteria for Seismic Design of Highway Bridges[J].BridgeConstruction,2006,(S2):135-139.in Chinese)
[9]李龙安,屈爱平,何友娣.公路桥梁抗震设计规范反应谱阻尼修正方法研究[J].桥梁建设,2006,(2):43-45.(LI Long-an,QU Ai-ping,HE You-di.Study of ModificationMethod for Response Spectrum Dampingin Code of Seismic De-sign of Highway Bridges[J].Bridge Construction,2006,(2):43-45.in Chinese)
[10]黄翔,李力,岳磊.某大跨径斜拉桥钢-混结合段PBL剪力键承载力研究[J].桥梁建设,2010,(3):23-27.(HUANG Xiang,LI Li,YUE Lei.Study of Bearing Capacityof PBL Shear Connectors for Steel-Concrete Joint Section of aLong Span Cable-Stayed Bridge[J].Bridge Construction,2010,(3):23-27.in Chinese)
[2]张猛,张哲,李天.与规范反应谱相对应的Clough-Pe-nzien模型参数研究[J].世界地震工程,2007,(1):58-62.(ZHANG Meng,ZHANGZhe,LI Tian.Study on Parametersof Clough-Penzien Seismic Random Model Corresponding toResponse Spectrumof GB50011-2001[J].World EarthquakeEngineering,2007,(1):58-62.in Chinese)
[3]纪诚,黄晓东,刘钊,等.南京市三山桥设计研究[J].世界桥梁,2009,(3):12-14.(JI Cheng,HUANG Xiao-dong,LI U Zhao,et al.Study ofDesign of Sanshan Bridge in Nanjing City[J].World Bridges,2009,(3):12-14.in Chinese)
[4]彭文勇,赵弘亮.桥梁的设计监理与设计优化[J].世界桥梁,2002,(2):75-78.(PENG Wen-yong,ZHAO Hong-liang.Supervision and Opti-mization of Bridge Design[J].World Bridges,2002,(2):75-78.in Chinese)
[5]周泳涛,刘延芳,鲍卫刚.新、旧桥梁抗震设计规范实桥计算比较[J].世界桥梁,2010,(3):28-30.(ZHOU Yong-tao,LI U Yan-fang,BAO Wei-gang.CalculationComparison of a Practical Bridge According to New and OldBridge Seismic Design Specifications[J].World Bridges,2010,(3):28-30.in Chinese)
[6]王克海,李茜,朱②,等.桥梁工程抗震设防标准问题[J].桥梁建设,2008,(2):63-65.(WANG Ke-hai,LI Qian,ZHU Xi,et al.Issues on Earth-quake Protection Criterion for Bridge Engineering[J].BridgeConstruction,2008,(2):63-65.in Chinese)
[7]周世清.大跨度连续组合梁桥施工质量的监理控制[J].世界桥梁,2009,(1):74-76.(ZHOUShi-qing.Supervision Control of Construction Qualityof Long Span Composite Continuous Box Girder Bridge[J].World Bridges,2009,(1):74-76.in Chinese)
[8]李龙安,何友娣,屈爱平.公路桥梁抗震设计的设防标准研究[J].桥梁建设,2006,(S2):135-139.(LI Long-an,HE You-di,QU Ai-ping.Study of ProtectionCriteria for Seismic Design of Highway Bridges[J].BridgeConstruction,2006,(S2):135-139.in Chinese)
[9]李龙安,屈爱平,何友娣.公路桥梁抗震设计规范反应谱阻尼修正方法研究[J].桥梁建设,2006,(2):43-45.(LI Long-an,QU Ai-ping,HE You-di.Study of ModificationMethod for Response Spectrum Dampingin Code of Seismic De-sign of Highway Bridges[J].Bridge Construction,2006,(2):43-45.in Chinese)
[10]黄翔,李力,岳磊.某大跨径斜拉桥钢-混结合段PBL剪力键承载力研究[J].桥梁建设,2010,(3):23-27.(HUANG Xiang,LI Li,YUE Lei.Study of Bearing Capacityof PBL Shear Connectors for Steel-Concrete Joint Section of aLong Span Cable-Stayed Bridge[J].Bridge Construction,2010,(3):23-27.in Chinese)
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