SEISMIC BEARING CAPACITY AND SETTLEMENTS OF FOUNDATIONS

被引:171
作者
RICHARDS, R
ELMS, DG
BUDHU, M
机构
[1] UNIV CANTERBURY,DEPT CIVIL ENGN,CHRISTCHURCH 1,NEW ZEALAND
[2] UNIV ARIZONA,DEPT CIVIL ENGN,TUCSON,AZ 85721
来源
JOURNAL OF GEOTECHNICAL ENGINEERING-ASCE | 1993年 / 119卷 / 04期
关键词
D O I
10.1061/(ASCE)0733-9410(1993)119:4(662)
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Field and laboratory observations of seismic settlements of shallow foundations on granular soils that are not attributable to changes in density or liquefaction arc explained in terms of seismic degradation of bearing capacity. Limit analysis using a Coulomb-type mechanism including inertial forces in the soil and on the footing gives expressions for seismic bearing capacity factors that are directly related to their static counterparts. Comparison of the two depicts clearly the rapid deterioration of the overall foundation capacity with increasing acceleration. Such periodic inertial fluidization causes finite settlements that are possible even in moderate earthquakes. Reduction in foundation capacity is due to both the seismic degradation of soil strength and the lateral inertial forces transmitted by shear to the foundation through the structure and any surcharge. A straightforward sliding-block procedure with examples is also presented for computing these settlements due to loss of bearing capacity for short time periods. This approach also leads to a design procedure for footings based on limiting seismic settlements to a prescribed value.
引用
收藏
页码:662 / 674
页数:13
相关论文
共 19 条
[1]  
Franklin AG, 1977, 5 US ARM ENG WAT EXP
[2]  
JUMIKIS AR, 1962, SOIL MECHANICS, P618
[3]  
Lambe T.W., 1969, SOIL MECH
[4]  
Mononobe N., 1929, P WORLD ENG C, V9, P176
[5]   EFFECTS OF EARTHQUAKES ON DAMS AND EMBANKMENTS [J].
NEWMARK, NM .
GEOTECHNIQUE, 1965, 15 (02) :139-&
[6]  
OKABE S, 1926, J JAPANESE SOC CIV E, V12
[7]  
Okamoto S., 1978, INTRO EARTHQUAKE ENG
[8]   Concerning the penetrability (hardness) of plastic building materis and the toughness of sections [J].
Prandtl, L .
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1921, 1 :15-20
[9]  
RICHARDS R, 1979, J GEOTECH ENG-ASCE, V105, P449
[10]   DYNAMIC FLUIDIZATION OF SOILS [J].
RICHARDS, R ;
ELMS, DG ;
BUDHU, M .
JOURNAL OF GEOTECHNICAL ENGINEERING-ASCE, 1990, 116 (05) :740-759