基于可靠度的复合桩基设计理论研究

由于桩间土物理性质有较大的离散性,所以复合桩基的承载力存在一定的不确定性。目前对复合桩基可靠性的研究,是由容许应力法向概率极限状态设计方法的过渡,即概率定值设计法。因此,确定各抗力的分项系数成为该设计方法的关键。介绍了分项系数的意义及复合桩基的分项系数,通过工程实例的计算,给出了各分项系数的取值范围,为以后复合桩基的设计提供参考。

The Study on Design Theory to Composite Pile Foundation Based on Reliability

Due to the physical property of big discrete in soil between piles,thus the bearing capacity of composite pile foundation exists some uncertainty.So far,the study of the reliability of composite pile foundation is a transition from the allowable stress method to the probability limit state design method,namely,probability definite value design method.Therefore,to determine each resistance of the partial factor becomes the key of this design method.This paper introduces the significance of the partial coefficient and the partial coefficient of composite pile foundation.Through the calculation of engineering examples,it gives the value of each partial coefficient and provides a reference for the future design of composite pile foundation.