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为了研究滑移与体外预应力对钢-混凝土组合简支梁自振频率的影响,提出了适用组合梁自振频率计算的静力折减刚度法和动力刚度修正系数法.以一根跨径为5 m的钢-混凝土组合简支试验梁为研究对象,分别采用静力折减刚度法、动力刚度修正系数法及换算截面法计算梁的自振频率,并将计算值与试验实测值进行对比.结果表明,采用动力刚度修正系数法计算得到的体外预应力组合梁的自振频率更接近于实测值,采用静力折减刚度法和换算截面法计算得到的梁的自振频率与实测值之间存在较大误差.当体外预应力值为100 k N时,换算截面法和静力折减刚度法与实测值的误差分别为19.3%和7.9%,动力刚度修正系数法误差则仅为2.9%.
In order to study the influence of slip and external prestressing on natural frequency of steel-concrete composite simple-supported beams, a static reduction stiffness method and a dynamic stiffness correction coefficient method are proposed to calculate the natural frequency of composite beams. Steel-concrete composite simply supported test beam is taken as the research object, and the natural frequency of the beam is calculated by static reduction stiffness method, dynamic stiffness correction coefficient method and converted section method respectively, and the calculated values are compared with the measured values , The natural frequency of externally prestressed composite beams calculated by using the dynamic stiffness correction coefficient method is closer to the measured value. There is a difference between the natural frequency of the beam and the measured value obtained by the static reduction stiffness method and the converted section method When the external prestressing value is 100 kN, the error between the converted section method and the static reduction stiffness method and the measured value are 19.3% and 7.9% respectively, while the error of the dynamic stiffness correction coefficient method is only 2.9%.