【摘要】 传统的静载试验分析假定桩体混凝土和钢筋应变一致,并认为受力变形过程中桩体材料模量不发生改变。桩基抗拔试验测试发现,当拉拔荷载达到一定强度时,在一定深度截面上的钢筋应变突然增大。这表明传统分析中的假定条件与实际情况有显著偏离。本文通过对桩基抗拔试验数据的分析,判断出各个阶段桩体的受力状态,提出了在较大的拉力荷载作用下桩身混凝土失效时桩体的轴力和侧摩阻力的计算方法,取得了良好的分析效果。更多还原

【Abstract】 Traditionally, it is assumed that strains both steel bars and concrete in the same across section of the pile body should be equal and the deformation modulus is a constant during the whole processing of the pile tensile loading test. The pile tensile loading test reveals that when the tensile load reaches a certain level, the strains of the steel bars at some across sections in a certain depth increase abruptly, which cannot be in accordance with the traditional assumptions mentioned above. With fully analysis and deduction on the test results, the mechanical states in different stages of the pile tensile loading test is estimated and a new way to calculate the pile’s axial force and frictional resistance with the concrete failure in its body is proposed.更多还原