Pile capacity under oblique loads - evaluation from load-displacement curves
Pile capacity under oblique loads - evaluation from load-displacement curves
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DOI：
10.1179/1939787914y.0000000072
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发表时间：
2015-09-01
影响因子：
1.9
通讯作者：
Singh, S. K.
中科院分区：
文献类型：
--
作者：
Bhardwaj, S.;Singh, S. K.
根据斜向荷载作用下的荷载-位移曲线估算桩的承载力是一项复杂的工作。因为在斜向载荷下，载荷-位移曲线不显示明显的倾陷点。不同的研究者采用了几种方法来评估斜向荷载作用下桩的承载力。本文对这些方法进行了综述。荷载倾角对桩承载力影响的研究，所选用的方法一直起着重要的作用。这是主要的因素，显着影响桩承载力的定量和导致建立一个明显的趋势，荷载倾斜的桩承载力。为了说明所选方法的意义，对直径为20 mm，长度为600 mm的桩在不同倾角的斜拔荷载下进行了试验研究。使用三种不同的方法根据荷载-位移曲线评估每个荷载倾斜度下的桩承载力。一种方法的结果表明，桩承载力在荷载倾斜度达到10度时增加，此后随着荷载倾斜度的增加而减小。第二种方法的计算结果表明，随着荷载倾角沿桩轴线方向的增大，单桩承载力不断减小。在第三种方法的结果中也观察到桩承载力随着荷载倾斜度的增加而减小，但是与第二种方法相比，在某些荷载倾斜度下的桩承载力显著不同，在45度处最小。根据桩承体系或结构的使用性能和功能要求，对所采用方法的适用性进行了论证。
Evaluation of pile capacity from load-displacement curves under oblique loads is an intricate task. Because under oblique loads, load-displacement curves do not exhibit a distinct plunge point. Several methods have been adopted by different researchers to evaluate pile capacity from load-displacement curves under oblique loads. A summary of all these methods has been presented in this paper. To delineate the effect of load inclination on pile capacity, the method opted, always plays an important role. It is the main factor which significantly affects the pile capacity quantitatively and leads to establish a distinct trend of load inclination on pile capacity. To illustrate the significance of opted method, an experimental study was conducted on 20 mm diameter and 600 mm length piles under oblique pullout loads of different inclinations. Pile capacity at each load inclination has been evaluated from load-displacement curves using three different methods. Results of one method indicate that there is an increase in pile capacity up to 10 degrees of load inclination and thereafter it decreases as load inclination increases. Whereas, results of second method show that pile capacity continuously decreases as load inclination increases with pile axis. Decrease in pile capacity with increase in load inclination was also observed in the results of third method, but pile capacity at certain loads' inclinations significantly differs as compared to the second method with minimum at 45 degrees. The paper also deliberates on the applicability of adopted methods as per serviceability and functionality requirements of system or structure to be supported by pile.