Reliability-Based Design of Shallow Foundations Based on Elastic Settlement
The shallow foundation design typically involves two-steps: (1) the ultimate bearing capacity calculation based upon general bearing capacity theories and (2) the maximum contact pressure calculation that produces an allowable total settlement. The allowable bearing capacity for the shallow foundation system is the lesser of the ultimate bearing capacity, divided by a factor of safety, and the computed maximum allowable contact pressure. Currently, these calculations utilize nominal values of soil strength and stiffness parameters and do not explicitly account for their variabilities. This paper develops a reliability-based design methodology for shallow foundations by incorporating variability in the soil parameters. The bearing soil strength and stiffness parameters are assumed to be random variables and the standard elastic settlement equations are combined with the Monte Carlo simulation technique to develop a series of probabilistic pressure–settlement curves. Based on an allowable magnitude of total settlement, the pressure-settlement curves are analyzed to develop probability distribution function histograms for allowable bearing capacity. The probability distribution functions can thus be utilized to determine the factor of safety against bearing capacity failure and, ultimately, develop resistance factors that can be included in Load and Resistance Factor Design (LRFD) methodologies.
Lance A.Roberts Anil Misra
South Dakota School of Mines and Technology, Rapid City, USA University of Missouri-Kansas City, Kansas City, USA
国际会议
上海
英文
2007-10-18（万方平台首次上网日期，不代表论文的发表时间）