考虑刚度退化的铁路低配筋混凝土桥墩抗震评估方法
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摘要
根据已有试验结果,得到适用于铁路低配筋混凝土桥墩的荷载位移双折线模型。选取4类场地的320条实际地震记录,利用该双折线模型研究4类场地的强度折减系数谱值随桥墩屈服后刚度折减系数变化的规律。结果表明:在考虑桥墩屈服后刚度退化的情况下,强度折减系数谱值随桥墩屈服后刚度折减系数的增大而降低,说明低配筋混凝土桥墩屈服后的刚度退化越大,桥墩对地震的强度需求越大。通过对4类场地强度折减系数谱的统计分析,给出考虑刚度退化的三折线型强度折减系数谱以及据此的铁路低配筋混凝土桥墩抗震评估方法。
From the existing experimental results,it can be found that the P-Δ load displacement curve of RC railway piers with low steel ratios can be described as a double-broken-line model.Then the total of 320 earthquake records for 4 types of soil conditions were selected,and the rule that the strength reduction factor spectra for 4 types of soil conditions varying with the stiffness reduction factors was studied by the proposed double-broken-line model.It can be seen that under the condition of considering stiffness degradation,the values of the strength reduction factor spectra will decrease with the increasing of the stiffness reduction factors.It indicates that the seismic strength demands will increase if the stiffness degradation of RC railway piers with low steel ratios becomes distinctive.From the statistical analysis of the strength reduction factor spectra for 4 types of soil conditions,the trilinear strength reduction factor spectra considering stiffness degradation were given and the seismic evaluation method of RC railway piers with low steel ratios was proposed.
From the existing experimental results,it can be found that the P-Δ load displacement curve of RC railway piers with low steel ratios can be described as a double-broken-line model.Then the total of 320 earthquake records for 4 types of soil conditions were selected,and the rule that the strength reduction factor spectra for 4 types of soil conditions varying with the stiffness reduction factors was studied by the proposed double-broken-line model.It can be seen that under the condition of considering stiffness degradation,the values of the strength reduction factor spectra will decrease with the increasing of the stiffness reduction factors.It indicates that the seismic strength demands will increase if the stiffness degradation of RC railway piers with low steel ratios becomes distinctive.From the statistical analysis of the strength reduction factor spectra for 4 types of soil conditions,the trilinear strength reduction factor spectra considering stiffness degradation were given and the seismic evaluation method of RC railway piers with low steel ratios was proposed.
引文
[1]中华人民共和国铁道部.GB50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2006.
[2]刘庆华,阎贵平.低配筋混凝土桥墩抗震性能的实验研究[J].北方交通大学学报,1996,20(5):517-521.(LI U Qinghua,YAN Guiping.Experi mental Studies on Seismic Behaviour of Reinforced Concrete Bridge Piers[J].Journal of Northern Jiaotong University,1996,20(5):517-521.in Chinese)
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[4]鞠彦忠.低配筋圆端型铁路桥墩的抗震性能研究[D].北京:北京交通大学,2004.(JU Yanzhong.Study on Seismic Performance of Round-Ended Rail way Piers with Low Longitudinal Steel Ratio[D].Beijing:Beijing Jiaotong University,2004.in Chinese)
[5]孙卓,李建中,闫贵平,等.钢筋混凝土单柱式桥墩抗震性能试验研究[J].同济大学学报:自然科学版,2006,34(2):160-164.(SUN Zhuo,LI Jianzhong,YAN Guiping,et al.Experi mental Study on Seismic Performance of Reinforced ConcreteOne-Column Bridge Piers[J].Journal of Tongji University:Natural Science,2006,34(2):160-164.in Chinese)
[6]CHUNG Y S,PARK C K,LEE D H.Seismic Performance of RC Bridge Piers Subjected to Moderate Earthquakes[J].Structural Engineering and Mechanics,2006,24(4):429-446.
[7]ORDAZ M,PEREZ R L E.Esti mation of Strength-Reduction Factors Elasto-Plastic Systems:a New Approach[J].Earthquake Engineering and Structural Dynamics,1998,27:889-901.
[8]LEE L H,HAN S,OH Y H.Determination of Ductility Factors Elasto-Plastic Hysteretic Models[J].EarthquakeEngineering and Structural Dynamics,1999,28:957-977.
[9]FAJFAR P.Capacity Spectrum Method Based on Inelastic Demand Spectra[J].Earthquake Engineering and Struc-tural Dynamics,1999,28(9):979-993.
[10]卓卫东,范立础.结构抗震设计中的强度折减系数研究[J].地震工程与工程振动,2001,21(2):84-88.(ZHUO Weidong,FAN Lichu.On Strength Reduction Factors Used for Seismic Design of Structures[J].Earth-quake Engineering And Engineering Vibration,2001,21(2):84-88.in Chinese)
[11]王东升,李宏男,王国新.统计意义一致的弹塑性设计位移谱[J].大连理工大学学报,2006,46(1):87-92.(WANG Dongsheng,LI Hongnan,WANG Guoxin.Statistical Property-Consistent Elastic-Plastic Displacement De-sign Spectra[J].Journal of Dalian University of Technology,2006,46(1):87-92.in Chinese)
[2]刘庆华,阎贵平.低配筋混凝土桥墩抗震性能的实验研究[J].北方交通大学学报,1996,20(5):517-521.(LI U Qinghua,YAN Guiping.Experi mental Studies on Seismic Behaviour of Reinforced Concrete Bridge Piers[J].Journal of Northern Jiaotong University,1996,20(5):517-521.in Chinese)
[3]PINTO A V,MOLINAJ,TSIONIS G.Cyclic Tests on Large-Scale Models of Existing Bridge Piers with Rectangu-lar Hollow Cross-Section[J].Earthquake Engineering and Structural Dynamics,2003,32(13):1995-2012.
[4]鞠彦忠.低配筋圆端型铁路桥墩的抗震性能研究[D].北京:北京交通大学,2004.(JU Yanzhong.Study on Seismic Performance of Round-Ended Rail way Piers with Low Longitudinal Steel Ratio[D].Beijing:Beijing Jiaotong University,2004.in Chinese)
[5]孙卓,李建中,闫贵平,等.钢筋混凝土单柱式桥墩抗震性能试验研究[J].同济大学学报:自然科学版,2006,34(2):160-164.(SUN Zhuo,LI Jianzhong,YAN Guiping,et al.Experi mental Study on Seismic Performance of Reinforced ConcreteOne-Column Bridge Piers[J].Journal of Tongji University:Natural Science,2006,34(2):160-164.in Chinese)
[6]CHUNG Y S,PARK C K,LEE D H.Seismic Performance of RC Bridge Piers Subjected to Moderate Earthquakes[J].Structural Engineering and Mechanics,2006,24(4):429-446.
[7]ORDAZ M,PEREZ R L E.Esti mation of Strength-Reduction Factors Elasto-Plastic Systems:a New Approach[J].Earthquake Engineering and Structural Dynamics,1998,27:889-901.
[8]LEE L H,HAN S,OH Y H.Determination of Ductility Factors Elasto-Plastic Hysteretic Models[J].EarthquakeEngineering and Structural Dynamics,1999,28:957-977.
[9]FAJFAR P.Capacity Spectrum Method Based on Inelastic Demand Spectra[J].Earthquake Engineering and Struc-tural Dynamics,1999,28(9):979-993.
[10]卓卫东,范立础.结构抗震设计中的强度折减系数研究[J].地震工程与工程振动,2001,21(2):84-88.(ZHUO Weidong,FAN Lichu.On Strength Reduction Factors Used for Seismic Design of Structures[J].Earth-quake Engineering And Engineering Vibration,2001,21(2):84-88.in Chinese)
[11]王东升,李宏男,王国新.统计意义一致的弹塑性设计位移谱[J].大连理工大学学报,2006,46(1):87-92.(WANG Dongsheng,LI Hongnan,WANG Guoxin.Statistical Property-Consistent Elastic-Plastic Displacement De-sign Spectra[J].Journal of Dalian University of Technology,2006,46(1):87-92.in Chinese)
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