【摘要】 为建立超声波法和低应变反射波法检测所得混凝土基桩波速的相互转换关系,本文给出了标准线性固体模型下粘弹性介质的三维和一维纵波速度之比及其实用简化公式,并且通过实验得出,混凝土构件的超声波速与1.054倍低应变动测波速之比处于1.03~1.12,具体数值会随着混凝土龄期、弹性模量和强度等级的增加而有所减小。更多还原

【Abstract】 This paper is to establish a relationship between wave velocities of concrete pile shaft measured with the ultrasonic wave method and the low-strain reflected wave method.It proposes a simplified formula for the ratio of wave velocity in infinite medium to that in one dimensional bar The viscoelastic theory based on standard linear solid model is adopted in the formulation of the formula.Experimental results show that the ratio of the ultrasonic wave velocity to the 1.054 timed low-strain reflected wave velocity ranges from 1.03 to 1.12.The ratio decreases with increasing in the age,the Young’s modulus and the strength of concrete.更多还原