土-结构动力相互作用结构自振周期的研究
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摘要
土与结构动力相互作用(简称SSI)存在于大多数的建筑物,在普通结构设计中,并没有考虑SSI,这和缺少一种简单有效的计算方法有关。通过调整结构的自振周期,可以很好地考虑SSI,实际情况是,一般的计算方法都偏于保守,计算结果与实测结果的误差离散性比较大。土是非线性很强的材料,结构振动过大,土容易进入非线性状态,使得计算变得复杂。找出由于土的非线性导致结构自振周期的增大的规律,对于实际工程很有意义。本文通过对刚性基础与土槽中柔性地基上的钢框架模型进行激振,分别测得上部结构在不同刚度以及不同激振加速度时的结构自振周期。并根据实验结果,拟合结构自振周期与激振加速度、上部结构与地基相对刚度比的关系。通过拟合后的公式对两个文献中的试验模型的自振周期进行计算,结果显示,本文拟合的公式能很好的考虑土的非线性,有效地减少简化模型计算与实测的差别。
Soil and structure dynamic interaction(SSI) exists in most buildings,while we rarely consider it in normal design because of lacking an efficient method of calculation.We used to adjust the natural period of structure when considering SSI in actual design.This frequently leads to conservative results.Soil is a highly nonlinear material,so the calculation of the structure considering the nonlinearity of soil is too complex to get accurate results. Finding out a way to simplify the calculation is significant to real engineering.In this article,a steel frame model is excited on the rigid foundation and the soil-trough indoor respectively under different working conditions,and the natural period under different accelerations in each condition can be gotten.We derive a formula for the period changing with the acceleration and relative stiffness ratio between superstructure and ground soil and use the formula to calculate the natural period of the model in two references.The results indicate that the difference between experiment natural period and estimated natural period can be effectively eliminated for applying the fitted formula.
Soil and structure dynamic interaction(SSI) exists in most buildings,while we rarely consider it in normal design because of lacking an efficient method of calculation.We used to adjust the natural period of structure when considering SSI in actual design.This frequently leads to conservative results.Soil is a highly nonlinear material,so the calculation of the structure considering the nonlinearity of soil is too complex to get accurate results. Finding out a way to simplify the calculation is significant to real engineering.In this article,a steel frame model is excited on the rigid foundation and the soil-trough indoor respectively under different working conditions,and the natural period under different accelerations in each condition can be gotten.We derive a formula for the period changing with the acceleration and relative stiffness ratio between superstructure and ground soil and use the formula to calculate the natural period of the model in two references.The results indicate that the difference between experiment natural period and estimated natural period can be effectively eliminated for applying the fitted formula.
引文
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[9]尚守平,熊伟,杜运兴,等.饱和场地土动力特性试验研究[J].岩土力学,2008,29(1):23-27.SHANG Souping,XIONG Wei,DU Yunxing,et al.Experimental study on dynamic characteristics of saturated soils[J].Rock and Soil Mechanics,2008,29(1):23-27.(in Chinese)
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[11]熊伟.SSI效应影响及新型分布式隔震系统(RSM)的理论分析与实验研究[D].湖南省长沙:湖南大学,2009.XIONG Wei,SSI effect and new distributed isolation system(RSM)theoretical analysis and experimental research[D].Changsha:Hunan Univer-sity,2009.(in Chinese)
[12]余俊.饱和土地基-桩基-上部结构动力相互作用理论分析与试验研究[D].长沙市,湖南大学,2007.YU Jun,Theoretical analysis and test research on saturated soil-pile-structure dynamic interaction[D].Changsha:Hunan University,2007.(inChinese)
[2]GB5001l-2010建筑抗震设计规范[S].GB 50011-2010Seismic Design of Buildings[S].(in Chinese)
[3]Building Seismic Safety Council,Federal Emergency Management Agency,National Earthquake Hazards Reduction Program.NEHRP RecommendedProvisions for seismic regulations for new buildings and other Structures(FEMA450),Part 2:Commentary,(2003 ed)[S].Washington,D.C.:Building Seismic Safety Council.2004.
[4]Building Seismic Safety Council,Federal Emergency Management Agency,National Earthquake Hazards Reduction Program.NEHRP RecommendedProvisions for Seismic Regulations for New Buildings and Other Structures(FEMA450),Part 1:Provisions,(2003 ed)[S].Washington,D.C.:Building Seismic Safety Council.2004.
[5]卢华喜,梁平英,杨峻,等.考虑土-结构动力相互作用效应的界限研究[J],地震工程与工程振动,2009,29(6):182-189.LU Huaxi,LIANG Pingying,YANG Jun,et al.Limit of considering dynamic soil-structure interaction[J].Journal of Earthquake Engineering andEngineering Vibration,2009,29(6):182-189.(in Chinese)
[6]尚守平,朱志辉,吴方伯.土-箱基-框架结构动力相互作用大比例模型野外试验研究[J].工程力学,2006,23(10):118-124.SHANG Shouping,ZHU Zhihui,WU Fangbo.Large-scale field model test on dynamic soil-box foundation-structure interaction[J].EngineeringMechanics,2006,23(10):118-124.(in Chinese)
[7]Wolf J P,Dynamic soil-structure interaction[M].Englewood Cliffs,New Jersey,Prentice-Hall,lnc,1985:38-50.
[8]李岳,姜忻良.土与结构相互作用振动台试验模型土设计方法分析[J].工程力学,2010,27(1):73-76.LI Yue,JIANG Xinliang.Analysis of similitude design of model soil used for shaking table test of soil-structure interaction system[J].EngineeringMechanics,2010,27(1):73-76.
[9]尚守平,熊伟,杜运兴,等.饱和场地土动力特性试验研究[J].岩土力学,2008,29(1):23-27.SHANG Souping,XIONG Wei,DU Yunxing,et al.Experimental study on dynamic characteristics of saturated soils[J].Rock and Soil Mechanics,2008,29(1):23-27.(in Chinese)
[10]薛荣俊,张维冈.纵横波速度比泊松比及分辨率比较研究[J].青岛海洋大学学报,1999,29(4):704-708.XUE Rongjun,ZHANG Weigang.The Study of vp/vs andσand the comparison of the discernibility of P and S waves[J].Journal of Ocean Uni-versity of Qingdao,2008,29(1):23-27.(in Chines)
[11]熊伟.SSI效应影响及新型分布式隔震系统(RSM)的理论分析与实验研究[D].湖南省长沙:湖南大学,2009.XIONG Wei,SSI effect and new distributed isolation system(RSM)theoretical analysis and experimental research[D].Changsha:Hunan Univer-sity,2009.(in Chinese)
[12]余俊.饱和土地基-桩基-上部结构动力相互作用理论分析与试验研究[D].长沙市,湖南大学,2007.YU Jun,Theoretical analysis and test research on saturated soil-pile-structure dynamic interaction[D].Changsha:Hunan University,2007.(inChinese)
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