Bearing capacity of piles in optimized design of pile foundation stiffness to reduce differential settlement
WANG Tao
1. Foundation Institute of China Academy of Building Research, Beijing 100013, China; 2. State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China
Abstract：The measured results of forces at pile top of tube frame structural system and large-scale model tests by applying the optimized design of pile foundation stiffness to reduce differential settlement show that the forces at pile top in different tube areas increase with the increase of loading level, and those under the tube and peripheral frame columns tend to be uniform under the working loads. The optimized design of pile foundation stiffness to reduce differential settlement can adjust distribution of forces and improve stress behavior of rafts. In model tests, the improvement ratio for tubes is in the decreasing order of angle pile, side pile and center pile. The corresponding pile butt force ratio of the forces to mean values is 1.15∶1.02∶0.83. The measured pile forces are in the decreasing order of peripheral frame columns, peripheral frame edge columns and piles under the tube. This is mainly due to the weakening of support stiffness caused by the vertical pile group effect. The pile group effect is weaker due to the fewer number of piles under the peripheral frame columns and angle piles.
王涛. 变刚度调平设计中桩基承载性状研究[J]. 岩土工程学报, 2015, 37(4): 641-649.
WANG Tao. Bearing capacity of piles in optimized design of pile foundation stiffness to reduce differential settlement. Chinese J. Geot. Eng., 2015, 37(4): 641-649.
[1] 王涛. 带裙房高层建筑桩基优化设计与桩土相互作用影响系数试验研究[D]. 北京: 中国建筑科学研究院, 2007. (WANG Tao. Experimental study on pile foundation optimum design of hise-rise buildings with podium and pile soil interaction influencc coefficient[D]. Beijing: China Academy of Building Research, 2007. (in Chinese)) [2] 刘金砺, 迟铃泉, 张武, 等. 高层建筑地基基础变刚度调平设计方法与处理技术[R]. 北京: 中国建筑科学研究院, 2008. (LIU Jin-li, CHI Ling-quan, ZHANG Wu, et al. The study on hise-rise building optimized design method and treatment technology of foundation stiffness to reduce differential settlement[R]. Beijing: China Academy of Building Research, 2008. (in Chinese)) [3] JGJ94—2008 建筑桩基技术规范[S]. 北京: 中国建筑工业出版社, 2008. (JGJ94—2008 Technical code for building pile foundation[S]. Beijing: China Architecture and Building Press, 2008. (in Chinese)) [4] 赵锡宏. 上海高层桩筏与桩箱基础设计理论[M]. 上海: 同济大学出版社, 1989. (ZHAO Xin-hong. Pile raft foundation and pile box foundation design theory in Shanghai[M]. Shanghai: Tongji University Press, 1989. (in Chinese)) [5] 刘金砺. 高层建筑地基基础变刚度调平设计方法与处理技术[R]. 北京: 中国建筑科学研究院, 2008. (LIU Jin-li. The study on hise-rise building optimized design method and treatment technology of foundation stiffness to reduce differential settlement[R]. Beijing: China Academy of Building Research, 2008. (in Chinese))
