浅析桩梁结构复合桩基的简化设计方法

就南京地区一幢住宅楼的复合桩基设计实例，根据复合桩基的设计理论，给出了桩梁结构复合桩基的简化设计方法。其主要设计思想是对大桩距低承台摩擦群桩中的单桩取极限承载力，形成桩-土共同作用并明确分担荷载的复合桩基。该设计方法简单而有效，取得了明显的经济效果，具有一定的工程应用价值。

SIMPLIFIED DESIGN METHOD OF COMPOSITE PILE FOUNDATION WITH SLEEPER

According to the design theory of composite pile foundation,the simplified design method of composite pile foundation with sleeper is presented based on the engineering practice in Nanjing. In this design theory,the ultimate bearing capacity of single pile is adopted in friction pile groups with large pile spacing and low pile cap,and the loads acting on the composite pile foundation are distinctly shared by the piles and the soil under the cap. The design method is simple,convenient and efficient with promising prospect of employment.