预应力混凝土梁自振频率的疲劳演变

杜永潇,卫军,孙晓立

Fatigue evolution of natural frequency for prestressed concrete beam

Yong-xiao DU,Jun WEI,Xiao-li SUN

图 12 试验梁的第1阶频率退化曲线

Fig.12 First order frequency degradation curves of test beams