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一、桩的荷载传递实例在现场试验中,通过在原型桩中埋设电阻应变片、钢筋应力计、应变砖等传感元件,可以求得桩侧摩阻力的分布规律。当桩身材料为钢筋混凝土时,由于钢筋混凝土是弹塑性体,其弹性模量(更确切地应称为变形模量)不是常量,而是应力、应变的函数,应采用“变弹性模量”的概念,即在不同荷载下,对不同桩身截面根据应力的大小取不等的弹性模量。现以在桩身主筋中埋设钢筋应力计的B202-2号桩为例,计算钢筋混凝土柱的桩侧摩阻力,其计算步骤如下: (1)根据高出试桩基坑底面的钢筋应力计(假设
First, the pile load transfer example In the field test, through the embedded in the prototype pile resistance strain gauges, steel strain gauges, strain bricks and other sensing elements, you can obtain the distribution of pile side friction resistance. When the pile material is reinforced concrete, since the reinforced concrete is an elasto-plastic body, its elastic modulus (more precisely, the deformation modulus) is not a constant, but a function of stress and strain, and the “variable elastic modulus” should be used. The concept of “” is that under different loads, the elastic modulus of different pile sections is taken according to the size of the stress. Now take the pile B202-2 piled in the main reinforcement of the pile as the example to calculate the pile side friction resistance of the reinforced concrete column. The calculation steps are as follows: (1) According to the steel bar stress meter higher than the bottom of the test pile foundation pit (Assuming