考虑泊松效应影响的弹塑性荷载传递模型

发布时间：2018-05-27 22:12

  本文选题：桩基 + 竖向荷载　； 参考：《深圳土木&建筑》2016年01期

【摘要】：本文提出了一种能考虑泊松效应影响的弹塑性荷载传递模型(t-z模型)。该模型既能反映不同材料的桩基在同一土体中抗压承载力的不同,也能反映同一材料桩基在同一土体中桩身抗压摩阻力与抗拔摩阻力的不同,同时还具备模拟循环荷载下t-z曲线滞回特性的能力。根据位移协调算法编制了可用于竖向压、拔荷载作用下单桩响应分析的Matlab程序,利用程序对模型试验进行了模拟,结果对比证明了该模型的适用性。最后分析了桩体弹性模量对压、拔极限摩阻力比值的影响,结果表明,该比值随弹性模量的减小而减小,对于混凝土桩,该值介于0.6~0.8之间,与规范建议的抗拔系数接近。
[Abstract]:In this paper, an elastic-plastic load transfer model is presented, which can take into account the effect of Poisson effect. The model can not only reflect the different compressive bearing capacity of pile foundation of different materials in the same soil, but also reflect the difference of compressive friction resistance and pull-out friction resistance of pile body of the same material in the same soil mass. At the same time, it has the ability to simulate the hysteresis characteristics of t-z curves under cyclic load. According to the displacement coordination algorithm, a Matlab program is developed for the analysis of the response of the pile under vertical compression and pull-out loads. The model tests are simulated by the program, and the results show that the model is applicable. Finally, the influence of the elastic modulus of the pile on the compression and the pull-out ultimate friction ratio is analyzed. The results show that the ratio decreases with the decrease of the elastic modulus, and for concrete pile, the value is between 0.6 and 0.8, which is close to the uplift coefficient suggested in the code.
【作者单位】： 深圳大学土木工程学院;中国市政工程中南设计研究总院有限公司;建设综合勘察研究设计院有限公司;哈尔滨工业大学深圳研究生院;
【分类号】：TU473.1
，

本文编号：1943989