拉索应力波传播速度与能量衰减特性试验研究

Experimental Study on Wave Velocity and Energy Attenuation in Cables

摘要:

通过在单根钢丝、无张力索及张拉索上进行不同声源的声发射试验，分别获得了应力波在不同传播介质中的首波波速、能量衰减规律及频谱变化情况.结果表明：单根钢丝上的首波波速接近圆杆一阶纵波理论值，拉索中的首波波速则略小于钢丝；索中能量衰减，受张拉力影响，张紧的拉索能量衰减要远小于无张力索，实桥拉索可采用0.447这一实测能量衰减因子进行断丝源的能量反演.

Abstract:

Through the acoustic emission tests in high strength wires, tension free cables and tensioned cables, head wave velocity, energy attenuation characteristics and spectrum alteration were discussed by taking different conditions into consideration. The results illustrate that, head wave velocity in single wire is close to the first order longitudinal wave, and it is slightly greater than that in cables; The energy attenuation factor in cables is influenced by tension force, which will attenuate more quickly in no tension cable than that in tension cable. Source energy inversion in real bridge can use the measured values 0.447.