摘要
新颁布的《公路钢筋混凝土与预应力混凝土桥涵设计规范》(简称《规范》)中承台底基桩竖向反力计算公式假定承台理想刚性,未考虑桩间距与承台厚度之比λ对承台受力性能的影响.考虑承台实际刚度,用AN SY S建立实体模型对圆形承台群桩基础进行有限元分析,揭示桩顶竖向力和总竖向荷载的比值与λ呈单增的抛物线关系.同时,通过分析数据的回归分析对《规范》中承台底基桩竖向反力计算公式提出了修正建议.
In the code JTG D62-2004, the formula to calculate the vertical force in the top of piles bases on the assumption that the cap is ideally rigid and the effect of proportion of the distance between pile center to thickness of cap （λ） is ignored. The model of pile group with cylindrical cap, considering the actual stiffness, is built and analyzed by ANSYS. The results indicate that the proportion of vertical force in middle pile to general vertical load increases with A. The error of the vertical force in the top of piles shouldn＇t be ignored if λ is greater than 0. 7, then the modified formula is proposed.
出处
《华中科技大学学报（城市科学版）》
CAS
2005年第4期17-20,共4页
Journal of Huazhong University of Science and Technology
基金
教育部博士点基金资助项目(2003年)
关键词
承台
桩顶竖向力
公式修正
cylindrical cap
vertical force on pile
modified formula
