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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。
Due to the large discrepancy of the physical properties of soil between piles, there is a certain uncertainty in the bearing capacity of composite pile foundation. At present, the research on the reliability of composite pile foundation is the transition from the design method of permissible stress normal probability limit state, that is, the probabilistic design method. Therefore, to determine the sub-coefficient of each resistance as the key to the design method. The meaning of sub-coefficient and the sub-coefficient of composite pile foundation are introduced. Through the calculation of engineering example, the range of each sub-coefficient is given, which can provide references for the design of composite pile foundation in the future.