基于地质力学模型试验的高原大桥落梁破坏机理
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摘要
通过对高原大桥进行地质力学相似模型试验,研究了水平荷载作用下近断层处场地变形对简支梁桥破坏的影响。结果表明:近断层处的场地集中变形导致桥梁结构破坏主要集中于桥面系及近断层一侧桥台,与高桥大桥的实际震害非常相似;地震中断层的错动对其附近场地产生较大的影响,造成桥面系与场地之间的变形不协调;断层的存在对附近场地的压缩变形有明显的放大作用;地震中场地变形,特别是近断层处的集中变形是造成简支梁桥落梁破坏的主要原因之一。
Transport system was severely destroyed during the 2008 Wenchuan Earthquake,and lots of bridges,especially those near the faultage,suffered severe damage and even collapsed,which led to inefficient rescue or reconstruction following the earthquake. Geomechnical similarity model test was conducted to investigate the effect of the deformation of the site nearby the fault on the damage of the simple supported girder bridge under the lateral loading. Results showed that the failure mode of the model was highly similar to that of Gaoyuan Bridge and deformation of the site was mainly happened near to the fault due to fault movement; the girder falling partly attributed to the centralized deformation of the site nearby the fault and partly attributed to the nonproportional rigid between the upper structure and the ground site; the deformation of the ground near to the fault was amplified by the fault movement during earthquake.
Transport system was severely destroyed during the 2008 Wenchuan Earthquake,and lots of bridges,especially those near the faultage,suffered severe damage and even collapsed,which led to inefficient rescue or reconstruction following the earthquake. Geomechnical similarity model test was conducted to investigate the effect of the deformation of the site nearby the fault on the damage of the simple supported girder bridge under the lateral loading. Results showed that the failure mode of the model was highly similar to that of Gaoyuan Bridge and deformation of the site was mainly happened near to the fault due to fault movement; the girder falling partly attributed to the centralized deformation of the site nearby the fault and partly attributed to the nonproportional rigid between the upper structure and the ground site; the deformation of the ground near to the fault was amplified by the fault movement during earthquake.
引文
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[2]Lei Tao,Li Bixiong,Cao Pengjie,et al.Analysis on damage of near-faultage bridges in Wenchuan Earthquake[J].Journal of Chongqing Jiaotong University:Natural Science Edition,2010,29(3):358-362.[雷涛,李碧雄,曹鹏杰,等.汶川地震近断层附近桥梁震害浅析[J].重庆交通大学学报:自然科学版,2010,29(3):358-362.]
[3]Xie Heping,Tai Jiajia,Deng Jianhui,et al.Analysis of damage mechanism of Gaoyuan Bridge in Hongkou[J].Journal of Sichuan University:Engineering Science Edition,2009,41(3):51-55.[谢和平,台佳佳,邓建辉,等.虹口高原大桥的破坏机制分析[J].四川大学学报:工程科学版,2009,41(3):51-55.]
[4]Sun Zhiguo,Wang Dongsheng,Zhang Bei,et al.Analysis of seismic failure mechanism and earthquake resistant measures for the abutments of Gaoyuan Bridge[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(4):79-87.[孙治国,王东升,张蓓,等.高原大桥桥台地震破坏机理与抗震措施分析[J].地震工程与工程振动,2012,32(4):79-87.]
[5]Li Shuping,Zeng Chao,Yang Xianquan,et al.Analysis on damage of bridges in“5.12”Wenchuan Earthquake[J].Highway,2009(7):125-128.[李曙平,曾超,阳先全,等.“5.12”汶川地震桥梁震害浅析[J].公路,2009(7):125-128.]
[6]Xie Li,Lu Yongkun,Fei Minglun.Damage to bridges caused by the Wenchuan MS 8.0 Earthquake[J].Journal of Seismological Research,2008,31(Supp):530-534.[解丽,卢永坤,非明伦.汶川8.0级地震桥梁震害[J].地震研究,2008,31(增刊):530-534.]
[7]Zhuang Weilin,Liu Zhenyu,Jiang Jinsong.Earthquake-induced damage analysis of highway bridges in Wenchuan Earthquake and countermeasures[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1377-1387.[庄卫林,刘振宇,蒋劲松.汶川大地震公路桥梁震害分析及对策[J].岩石力学与工程学报,2009,28(7):1377-1387.]
[8]Li Hongjing,Lu Ming,Wen Zengping,et al.Characteristics of bridge damages in Wenchuan Earthquake[J].Journal of Nanjing University of Technology:Natural Science Edition,2009,31(1):24-29.[李弘晶,陆鸣,温增平,等.汶川地震桥梁震害的特征[J].南京工业大学学报:自然科学版,2009,31(1):24-29.]
[9]Fan Lichu,Li Jianzhong.The damage analysis of bridges in Wenchuan Earthquake and seismic resistant countermeasure[J].Highway,2009(5):122-128.[范立础,李建中.汶川桥梁震害分析与抗震设计对策[J].公路,2009(5):122-128.]
[10]Yang Gaozhong.The damage analysis and seismic calculation of girder bridges under the action of earthquake along the longitudinal direction on the rigid foundation[J].Highway,1980(3):22-30.[杨高中.在刚性地基上梁桥顺桥向震害分析与抗震计算[J].公路,1980(3):22-30.]
[11]Li Fanfan.Influences of nonlinearity and soil-pile-structure interaction on seismic response analysis of large-span steel arch bridge[D].Beijing:Beijing Science and Technology University,2007.[李凡凡.考虑非线性和桩土相互作用因素的大跨度钢拱桥地震反应分析[D].北京:北京科技大学,2007.]
[12]Yang Gaozhong.The earthquake damage and analysis of bridges on the rigid foundation[J].East China Highway,1981(S1):17-42.[杨高中.刚性地基上桥梁震害与分析[J].华东公路,1981(S1):17-42.]
[13]Huang Kaizhu,Zhang Qianbing,Zhang Jianheng.Geomechanical model testing of surface rupture and bridge damage produced by discontinuous reverse faults[J].Journal of Sichuan University:Engineering Science Edition,2010,42(5):58-67.[黄凯珠,张乾兵,张建恒.非连续逆断层引起地表破裂和桥梁破坏的模型试验[J].四川大学学报:工程科学版,2010,42(5):58-67.]
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