ABSTRACT

Earthquakes have unfavorable effects of reducing uplift resistance of plate anchors. Present work investigates the seismic vertical uplift resistance of shallow buried square and rectangular plate anchors in granular soil by using the upper bound theorem of limit analysis in combination with pseudo-static approach. The influence of shear transfer at the interface between anchor plate and overlying soil has been taken into account. The uplift resistance was evaluated in terms of dimensionless factors due to component of soil weight and surcharge pressure on the ground surface for varying combinations of parameters involved in the present analysis. Results revealed that seismic uplift factors increase continuously with increasing soil friction angle and embedment ratio of anchors; whereas, the same reduce with increasing acceleration coefficients, shear factor and aspect ratio of anchors. A significant reduction was observed for higher shear factor and earthquake acceleration coefficients, especially for lower soil friction angle and embedment ratio, and for higher aspect ratio of anchors.

摘要

地震对降低板锚的抗拔力有不利影响。目前的工作是利用极限分析上界定理结合拟静力方法研究浅埋方形和矩形板锚在粒状土中的地震竖向抗拔力。考虑了锚板与上覆土界面处剪切传递的影响。对于本分析中涉及的不同参数组合，由于土壤重量和地表上的超载压力的分量，根据无量纲因素评估了抗隆起性。结果表明，随着土体摩擦角和锚杆嵌入比的增加，地震抬升因子不断增加；然而，同样随着加速度系数的增加而减少，锚杆的剪切系数和纵横比。观察到较高的剪切因子和地震加速度系数显着降低，特别是对于较低的土壤摩擦角和嵌入比，以及较高的锚杆纵横比。