变截面工字形钢筋混凝土桩水平承载特性模型试验研究

Model test study on bearing capacity performance of variable cross-section I-shaped reinforced concrete pile under horizontal load

为研究变截面工字形钢筋混凝土桩在水平荷载作用下的受力特性,对其进行了单桩水平静载缩尺模型试验,实测得到了水平荷载作用下变截面工字形钢筋混凝土桩与土共同作用的工作性能,分析了变截面工字形钢筋混凝土桩受水平荷载作用时的内力、变形、极限承载力。结果表明,垂直翼缘方向的水平临界荷载近似为垂直腹板方向水平临界荷载的3倍,桩身最大弯矩分布在距桩顶0.34m处,桩身弯矩影响深度约为0.96m。

To research the mechanical behavior of variable cross-section I-shaped reinforced concrete pile under horizontal load, horizontal static load test of single pile was carried out by reduced-scale model. Through the analysis of the measured results, the working performance of the variable across-section I-shaped reinforced concrete pile interacted with soil under horizontal load was obtained. The internal force, deformation and the ultimate bearing capacity of the variable cross-section I-shaped reinforced concrete pile under horizontal load were analyzed. Results show that horizontal critical load in direction of perpendicular to flange is approximately three times as that in direction of perpendicular to the web. The position of maximum bending moment is located at 0. 34m from the top of the pile. The influence depth of pile bending moment is approximate 0. 96m.