预应力混凝土管桩桩身受压承载力的成桩工艺系数研究  

Research on the Safety Factor of Compression Capacity for Prestressed Concrete Pipe Piles

作　　者：秋仁东[1] 石玉成[2] 孙轶斌 

机构地区：[1]中国建筑科学研究院,北京100013 [2]中国地震局兰州地震研究所,兰州730000 [3]河南省建筑科学研究院,郑州450053

出　　处：《建筑科学》2011年第1期56-60,共5页Building Science

基　　金：国家自然科学基金资助项目(50878200)

摘　　要：预应力混凝土管桩的竖向承载力由土对桩的支撑阻力和桩身受压承载力确定。桩身的受压承载力是制约单桩竖向承载力设计取值的重要指标。目前国内相关技术标准与规程中有关预应力管桩桩身受压承载力设计值的计算公式较多,没有形成统一的计算公式,有的计算结果并不能真实反应管桩的实际承载能力。本文通过桩身混凝土芯样强度试验数据的分析,考虑了桩身在受压过程中的残留预压应力,求得了成桩工艺系数。The vertical bearing capacity of the prestressed concrete pipe pile is determined by the foundation soil and pile shaft separately.The compression capacity of the prestressed concrete pipe pile is one of the most important qualifying indexes.At present,there are many different design formulas which exist in different codes for design.Some of them in the code for estimating the pile shaft compression capacity cannot well match the actual bearing capacity.There is not uniform formula to calculate the pile shaft compression capacity currently.In this paper,based on the test data analysis about the concrete samples from the construction piles,the residue compressive prestress is considered in the same time,a better safety factor to the design formula is acquired.

关 键 词：预应力混凝土管桩 受压承载力 成桩工艺系数 

分 类 号：TU473.13[建筑科学—结构工程] TU473.12[建筑科学—土工工程]