多层建筑物地基震陷的简化计算方法及其影响因素分析
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摘要
简要阐述了震陷的机理,探讨了估算建筑物震陷的简化计算方法,讨论了建筑物的基底压力、地震动强度及基础埋深、尺寸、形式的改变对地基震陷量的影响,初步给出了这些因素对地基震陷量影响的基本规律:1地基震陷量随基底压力的增大、基础埋深的增加、地震动强度的增大而增加;2对于特定的多层建筑物和地基条件,当地面运动峰值加速度大于某临界加速度值时,地基震陷量急剧增大;3对于片筏基础,在基础宽度不变的情况下,震陷量随基础长度的减小而逐渐减小;在基础长度不变的情况下,震陷量随基础宽度的增大而增大;4在其它条件相同的情况下,基底压力相同时片筏基础的震陷量远大于条形基础的震陷量,且条形基础的宽度B=1.2m时,其震陷量最小。
The mechanics of earthquake-induced foundation settlement for multi-storied building is briefly discussed and simplified method for calculating the earthquake-induced foundation settlement is presented in this paper. Based on this simplified method, the effects of foundation pressure, ground motion intensity, embedded depth, dimension and types of foundation on earthquake-induced foundation settlement are analyzed. It is concluded from these analyses that: ①with the increase of foundation pressure, or embedded depth of foundation or ground motion intensity, the earthquake-induced foundation settlements is increased. ②For some buildings and grounds, the seismic settlement may increase quickly when the peak value acceleration of ground motion come to a critical value. ③For raft foundations with the same width, the seismic settlement may reduce with the decrease length of foundation. But, for raft foundations whose length is the same, the seismic settlement may increases with the widening of foundation. ④Under the same condition, the earthquake-induced foundation settlement of multi-storied building on strip foundation is far greater than that of the same structure on raft foundation, and the earthquake-induced foundation settlement of multi-storied building is least with width of strip foundation of 1.2 m.
The mechanics of earthquake-induced foundation settlement for multi-storied building is briefly discussed and simplified method for calculating the earthquake-induced foundation settlement is presented in this paper. Based on this simplified method, the effects of foundation pressure, ground motion intensity, embedded depth, dimension and types of foundation on earthquake-induced foundation settlement are analyzed. It is concluded from these analyses that: ①with the increase of foundation pressure, or embedded depth of foundation or ground motion intensity, the earthquake-induced foundation settlements is increased. ②For some buildings and grounds, the seismic settlement may increase quickly when the peak value acceleration of ground motion come to a critical value. ③For raft foundations with the same width, the seismic settlement may reduce with the decrease length of foundation. But, for raft foundations whose length is the same, the seismic settlement may increases with the widening of foundation. ④Under the same condition, the earthquake-induced foundation settlement of multi-storied building on strip foundation is far greater than that of the same structure on raft foundation, and the earthquake-induced foundation settlement of multi-storied building is least with width of strip foundation of 1.2 m.
引文
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[2] 陈国兴,谢君斐,张克绪.天然地基基础的震害分析[J].岩土工程学报,1995(1):66-72
[3] 谢君斐,石兆吉,郁寿松,等.液化危害性分析[J].地震工程与工程振动,1988(1):61-77
[4] 陈国兴主编.高层建筑基础设计[M].北京:中国建筑工业出版社,2000
[5] T.L.Youd,I.M.Idriss.LiquefactionResistanceofsoils:SummaryReprotformthe1996NCEERand1998NCEER/NSFworkshopsonevaluationofliquefactionresistanceofsoils[J].JournalofGeotechnicalandGeoenvionmentalEngeering,2001(10),817-833
[6] 陈国兴,陈忠汉主编.工程结构抗震设计原理[M].北京:中国水利水电出版社,2002
[7] [澳]H.G.Poulos,E.H.Davis著,孙幼兰译.岩土力学弹性解[M].徐州:中国矿业大学出版社,1990
[8] 陈国兴,王 忆,谢君斐,等.场地液化势及其危害性评价[J].岩土工程师,1993(2):7-12
[9] 杨石红,刘静蓉.软弱地基土层震陷简化计算方法研究[J].世界地震工程,1997(2):52-61
[10]石兆吉,丰万玲.砖房震陷计算分析[J].地震工程与工程振动,1991(1):89-98
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