震区圆柱式桥梁墩柱配筋率取值范围分析
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摘要
为研究配筋率对圆柱式钢筋混凝土桥墩延性抗震性能影响,基于实际工程项目设置多个不同纵筋率和配箍率的工况,利用有限元软件进行数值模拟,通过分析增加纵筋率后试件位移延性系数、耗能能力和刚度的变化趋势,确定出试件具有较优抗震性能的纵筋率范围为0. 82%～2. 51%;通过分析不同纵筋率与配箍率相互作用对试件位移延性系数、耗能能力和刚度的变化趋势的影响可知,增大纵筋率将提高桥墩的承载力,且配箍率越大,增加纵筋率对试件极限承载力提升效果越明显。此外,墩柱纵筋率和配箍率都较低时不利于结构抗震。
The objective of this study is to investigate the effect of different reinforcement ratios on the ductility and seismic behaviors of cylindrical reinforced concrete pier. Several different longitudinal reinforcement ratios and stirrup ratios are set up on the basis of actual engineering projects. Finite element software is used for numerical simulation. By analyzing the variation trend of displacement ductility coefficient, energy dissipation capacity, and stiffness with increasing longitudinal reinforcement ratio,the range of longitudinal reinforcement ratio with better seismic performance is determined to be 0. 82% ～ 2. 51%. By analyzing the influence of the interactionbetween different longitudinal reinforcement ratios and stirrup ratios on the variation trend of displacement ductility coefficient,energy dissipation capacity,and stiffness of specimens,it can be concluded that increasing the longitudinal reinforcement ratio raises the bearing capacity of piers.The greater the stirrup ratio,the more obvious the effect of increasing the longitudinal reinforcement ratio on the ultimate bearing capacity of specimens. In addition,the longitudinal reinforcement ratio and stirrup ratio of pier are relatively low,which is not conducive to structural earthquake resistance.
The objective of this study is to investigate the effect of different reinforcement ratios on the ductility and seismic behaviors of cylindrical reinforced concrete pier. Several different longitudinal reinforcement ratios and stirrup ratios are set up on the basis of actual engineering projects. Finite element software is used for numerical simulation. By analyzing the variation trend of displacement ductility coefficient, energy dissipation capacity, and stiffness with increasing longitudinal reinforcement ratio,the range of longitudinal reinforcement ratio with better seismic performance is determined to be 0. 82% ～ 2. 51%. By analyzing the influence of the interactionbetween different longitudinal reinforcement ratios and stirrup ratios on the variation trend of displacement ductility coefficient,energy dissipation capacity,and stiffness of specimens,it can be concluded that increasing the longitudinal reinforcement ratio raises the bearing capacity of piers.The greater the stirrup ratio,the more obvious the effect of increasing the longitudinal reinforcement ratio on the ultimate bearing capacity of specimens. In addition,the longitudinal reinforcement ratio and stirrup ratio of pier are relatively low,which is not conducive to structural earthquake resistance.
引文
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[17]赵丹.配筋率对公路桥梁墩柱延性抗震性能影响的研究[D].西安科技大学,2017.
[18]蒋丽忠,邵光强,姜静静,等.高速铁路圆端形实体桥墩抗震性能试验研究[J].土木工程学报,2013,46(3):86-95.
[2]中华人民共和国交通运输部.公路桥梁抗震设计细则:JTG/TB02-01-2008[S].北京:人民交通出版社,2008.
[3]中华人民共和国交通运输部.铁路工程抗震设计规范:GB 50111-2006[S].北京:中国计划出版社,2006.
[4] CALVI M G,PRIESTLEY M J N. Displacement-based seismic design of bridges[J]. Structural engineering international,2013,23(2):112-121.
[5] WEI B,LI X,LI J Z. Displacement-based seismic design of continuous bridges[J]. Journal of civil architectural and environmental engineering,2010,32(5):53-59.
[6] GE H,LAN K,YASUHIRO T. Extremely low-cycle fatigue tests of thick-walled steel bridge piers[J]. Journal of bridge engineering,2013,18(9):858-870.
[7] BAE S,BAYRAK O. Plastic hinge length of reinforced concrete columns[J]. ACI structural journal,2008,105(3):290-300.
[8]湛缕金.钢筋混凝土矩形桥墩的地震损伤及其抗震性能分析[D].长沙理工大学,2015.
[9]李治国,张于晔.不同设计形式的桥墩延性抗震性能对比分析[C]//王学东.建筑结构抗震技术国际会议论文集.苏州:建筑结构杂志社,2014.
[10]张健,肖文杰.独柱墩桥梁抗倾覆稳定性分析[J].公路工程,2013,38(4):170-173.
[11]黄峥,白植舟.钢筋混凝土桥墩延性影响因素理论研究[J].桥梁建设,2012,42(4):28-33.
[12]周敉,封伟,谢功元等.基于F-R-M方法的桥梁地震风险评估研究[J].广西大学学报(自然科学版),2017,42(1):299-308.
[13]李贵乾.钢筋混凝土桥墩抗震性能试验研究及数值分析[D].重庆交通大学,2010.
[14]李贵乾,郑罡,王军.圆形钢筋混凝土桥墩抗震性能试验评估(Ⅰ):试验设计及初步结果[J].重庆交通大学学报(自然科学版),2011,30(5):889-894.
[15]李贵乾,郑罡,王军.圆形钢筋混凝土桥墩抗震性能(Ⅱ):试验结果评估[J].重庆交通大学学报(自然科学版),2011,30(6):1270-1274.
[16]孙伟.弯剪破坏钢筋混凝土桥墩抗震变形能力与配箍要求评价[D].大连海事大学,2011.
[17]赵丹.配筋率对公路桥梁墩柱延性抗震性能影响的研究[D].西安科技大学,2017.
[18]蒋丽忠,邵光强,姜静静,等.高速铁路圆端形实体桥墩抗震性能试验研究[J].土木工程学报,2013,46(3):86-95.