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 3 振动平衡状态下微梁段的受力示意图

Fig.3 Force diagram of micro beam unit under vibration balance state