基于阻尼比的双线型土动力模型研究
|
摘要
通过对粉质粘土动力滞回曲线的研究,提出了一种新型基于阻尼比的双线型土动力本构模型.该模型在假定构造滞回曲线与实测滞回曲线阻尼比相等的基础上,将土动力滞回曲线等效为由2组直线构成的平行四边形.这样既保证了理论曲线对粉质粘土真实耗能特性的模拟,又保留了计算模型较高的计算效率.在此基础之上推导了等幅对称荷载下滞回曲线理论方程,并将该模型推广到了不规则加卸载情况.模型的计算结果与试验结果比较表明,该模型能够较好地模拟土在地震循环荷载作用下的滞回特性.
Through the study of the dynamic hysteretic loop curve of silt clay,a new bilinear model of soil based on damping ratio was proposed.Based on the principle that the damping ratio of hysteretic loop curve for construction was equal to that for test,the hysteretic loop curve was equivalent to a parallelogram composed of two groups of beelines.In this way,the actual energy-consumption characteristic of silt clay was simulated,and high calculation-efficiency was retained.In addition,the theoretical equations of hysteretic loop curve under symmetrical and constant-amplitude load were deduced,and the model was applied to the case of irregular loading and unloading.Comparisons between calculation and tests have shown that the model proposed can simulate the hysteretic behavior of the soil under seismic cyclic-load well.
Through the study of the dynamic hysteretic loop curve of silt clay,a new bilinear model of soil based on damping ratio was proposed.Based on the principle that the damping ratio of hysteretic loop curve for construction was equal to that for test,the hysteretic loop curve was equivalent to a parallelogram composed of two groups of beelines.In this way,the actual energy-consumption characteristic of silt clay was simulated,and high calculation-efficiency was retained.In addition,the theoretical equations of hysteretic loop curve under symmetrical and constant-amplitude load were deduced,and the model was applied to the case of irregular loading and unloading.Comparisons between calculation and tests have shown that the model proposed can simulate the hysteretic behavior of the soil under seismic cyclic-load well.
引文
[1]谢定义.土动力学[M].西安:西安交通大学出版社,1988.XIE D Y.Soil dynamics[M].Xi’an:The Publication of Xi’anJiaotong University,1988.(In Chinese)
[2]王海东,尚守平,卢华喜,等.场地土动剪模量的试验对比研究[J].湖南大学学报:自然科学版,2005,32(3):33-37.WANG H D,SHANG S P,LU H X,et al.Comparative study ofdynamic shear modulus through laboratory experiments compara-tive study of dynamic shear modulus through laboratory experim-ents[J].Journal of Hunan University:Natural Sciences,2005,32(3):33-37.(In Chinese)
[3]王绍博,丁海平.土动力学参数对土层动力反应的影响[J].地震工程与工程振动,2001,21(1):105-108.WANG S B,DING H P.Effect of soil dynamic parameters onseismic responses of soil layers[J].Earthquake Engineering andEngineering Vibration,2001,21(1):105-108.(In Chinese)
[4]KIM Y S,ROESSET Jose M.Effect of nonlinear soil behavior oninelastic seismic response of a structure[J].International Journalof Geomechanics,ASCE,2004,4(2):104-114.
[5]栾茂田,林皋.场地地震反应一维非线性计算模型[J].工程力学,1998,9(1):94-103.LUAN M T,LIN G.Computational model for nonlinear analysisof soil site seismic response[J].Engineering Mechanics,1998,9(1):94-103.(In Chinese)
[6]PYKE R.Nonlinear models for irregular cyclic loadings[J].Jour-nal of the Geotechnical Engineering Division,ASCE,1979,105(6):715-726.
[7]王志良,王余庆,韩清宇.不规则循环剪切荷载作用下土的粘弹塑性模型[J].岩土工程学报,1980,2(3):10-19.WANG Z L,WANG Y Q,HAN Q Y.Visco-elastoplastic modelfor soils under irregular cyclic loading[J].Chinese Journal ofGeotechnical Engineering,1980,2(3):10-19.(In Chinese)
[8]尚守平,刘方成,王海东.基于阻尼的地震循环荷载作用下粘土非线性模型[J].土木工程学报,2007,40(3):74-82.SHANG S P,LIU F C,WANG H D.Nonlinear model based ondamping ratio for clays under seismic loading[J].China Civil En-gineering Journal,2007,40(3):74-82.(In Chinese)
[2]王海东,尚守平,卢华喜,等.场地土动剪模量的试验对比研究[J].湖南大学学报:自然科学版,2005,32(3):33-37.WANG H D,SHANG S P,LU H X,et al.Comparative study ofdynamic shear modulus through laboratory experiments compara-tive study of dynamic shear modulus through laboratory experim-ents[J].Journal of Hunan University:Natural Sciences,2005,32(3):33-37.(In Chinese)
[3]王绍博,丁海平.土动力学参数对土层动力反应的影响[J].地震工程与工程振动,2001,21(1):105-108.WANG S B,DING H P.Effect of soil dynamic parameters onseismic responses of soil layers[J].Earthquake Engineering andEngineering Vibration,2001,21(1):105-108.(In Chinese)
[4]KIM Y S,ROESSET Jose M.Effect of nonlinear soil behavior oninelastic seismic response of a structure[J].International Journalof Geomechanics,ASCE,2004,4(2):104-114.
[5]栾茂田,林皋.场地地震反应一维非线性计算模型[J].工程力学,1998,9(1):94-103.LUAN M T,LIN G.Computational model for nonlinear analysisof soil site seismic response[J].Engineering Mechanics,1998,9(1):94-103.(In Chinese)
[6]PYKE R.Nonlinear models for irregular cyclic loadings[J].Jour-nal of the Geotechnical Engineering Division,ASCE,1979,105(6):715-726.
[7]王志良,王余庆,韩清宇.不规则循环剪切荷载作用下土的粘弹塑性模型[J].岩土工程学报,1980,2(3):10-19.WANG Z L,WANG Y Q,HAN Q Y.Visco-elastoplastic modelfor soils under irregular cyclic loading[J].Chinese Journal ofGeotechnical Engineering,1980,2(3):10-19.(In Chinese)
[8]尚守平,刘方成,王海东.基于阻尼的地震循环荷载作用下粘土非线性模型[J].土木工程学报,2007,40(3):74-82.SHANG S P,LIU F C,WANG H D.Nonlinear model based ondamping ratio for clays under seismic loading[J].China Civil En-gineering Journal,2007,40(3):74-82.(In Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心