【摘要】 建立预应力钢筋混凝土等直梁强迫振动的运动微分方程,分析了梁在预应力钢筋作用下的横向振动问题。将运动微分方程解耦,得到梁在预应力作用下自振频率的解析解以及梁振动时的动力响应。分析了梁的自振频率与预应力和偏心距的关系。通过实例计算,得到了关于不同速度移动荷载车辆作用下梁的动力挠度曲线,并给出了考虑预应力和不考虑预应力时梁的动力效应比较。结果表明:随着车辆荷载移动速度的增大,梁的动力挠度随之增大;考虑预应力时梁的动力效应略有降低。更多还原

【Abstract】 A prestressed concrete beam under moving load is considered. The differential equations of forced vibration of the beam are established, the transversal vibration behaviors are analyzed. The natural frequency and dynamic responses of the beam under prestressed force and moving load are plotted, by decoupling and resolving the differential equations. The relationship between natural frequency and prestressed force or eccentricity is discussed. The dynamic deflection curves of the beam under moving loads at various speeds are plotted, and the comparison between dynamical effects whether considering the prestressed force is carried out.更多还原