Abstract：To study the bearing behavior of a single pile in ground of medium-dense sand under the combined loads of horizontal force H and torque T, a loading device of applying the combined loads of H and T on the pile top in indoor model tests was designed. Based on a series of comparative tests, the bearing capacities, inner forces and deformation along the pile shaft under various combined load magnitudes and in different applied sequences (i.e., H→T or T→H) as well as the influencing curves were obtained. The results show that compared with the ultimate bearing capacity under a single load of H or T (i.e., Hu or Tu), the combined action of H-T loads may lead to an obvious decrease of the bearing capacity. For example, applying 2/3Tu in advance may reduce the horizontal bearing capacity by 12.4%, while applying 2/3Hu in advance may result in a reduction of the torsional capacity up to 48.5%. Therefore, traditional superposition principles can’t be simply used to evaluate the bearing capacity of piles under the combined H-T loads. Finally, based on the FEM and the m method for bar system, an amplification factor αTH reflecting the effect of H on the torsional capacity was introduced to form the unified stiffness matrix of pile shaft, the calculation program of FEM was coded in MATLAB, and then the calculated results of FEM were compared with those of model tests.
邹新军 丁仕进 徐洞斌 . 中密砂土地基中H-T组合作用下单桩承载特性研究[J]. 土木工程学报, 2017, 50(11): 107-114.
Zou Xinjun Ding Shijin Xu Dongbin. Bearing behavior of a single pile in ground of medium-dense sand under the combined H-T loads. 土木工程学报, 2017, 50(11): 107-114.
