摘要
为研究桩基柔度对桥墩计算长度系数的影响,推导出了考虑桩基柔度的墩顶水平柔度计算公式,并将邻跨下部结构及支座抗推刚度集成为墩顶水平弹性支撑,利用轴压杆件的欧拉公式建立计算长度系数与临界荷载的关系,通过构件稳定性计算分析了影响计算长度系数的参数及其变化规律。结果表明,考虑桩基柔度的桥墩计算长度系数的计算结果较不考虑时的大,增幅至少在10%以上;桥墩较高时,桩基柔度对计算结果影响复杂。最后,建议在高墩设计中考虑桩基柔度的影响,以获得较准确的计算长度系数来保证结构安全。
In order to investigate the effect of effective length factor of piers pile when considering the pile foundation flexibility,calculation formula of pier-top＇s horizontal flexibility is derived,besides,the pier-top＇s horizontal elastic support is integrated by anti-push rigidity of adjacent span＇s substructure and support.The relationship between effective length factor and critical loads is established by means of Euler＇s formula of axial compressive bar.According to component stability calculation,the influence parameters and the change law of effective length factor are analyzed.The results show that the effective length factor considering the pile foundation flexibility is greater than not considering,and the growth rate of them is 10% at least;it is complex that calculation is influenced by the pile foundation flexibility,when pier is tall.Finally,it is advised that design of pier which is tall should consider the influence of the pile foundation flexibility in order to get more accurate effective length factor to guarantee safety of framework.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2011年第7期88-93,共6页
Journal of Wuhan University of Technology
基金
国家交通运输部西部建设项目(2011318812970)
关键词
桩基柔度
计算长度系数
抗推刚度集成
欧拉公式
临界荷载
pile foundation flexibility
effective length factor
anti-push rigidity integration
Euler＇s formula
critical loads
作者简介
高小妮（1983-），女，博士生．E-mail：gaoxiaoni0001@163．com
