考虑滑移效应的体外预应力钢-混凝土组合梁自振频率分析

发布时间：2018-01-13 21:05

本文关键词：考虑滑移效应的体外预应力钢-混凝土组合梁自振频率分析　出处：《东南大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：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%.
[Abstract]:In order to study the effect of slip and external prestress on the natural vibration frequency of steel-concrete composite simply supported beam. The static reduction stiffness method and the dynamic stiffness correction coefficient method are proposed to calculate the natural vibration frequency of composite beams. A steel-concrete composite simply supported experimental beam with span of 5 m is taken as the research object. The static stiffness reduction method, the dynamic stiffness correction coefficient method and the conversion section method are used to calculate the natural vibration frequency of the beam, and the calculated values are compared with the experimental results. The natural vibration frequency of the externally prestressed composite beam calculated by the dynamic stiffness correction coefficient method is closer to the measured value. There is a large error between the natural vibration frequency and the measured value of the beam calculated by the static reduction stiffness method and the conversion section method, when the external prestressing force is 100 KN. The errors of the conversion section method and the static reduction stiffness method and the measured values are 19.3% and 7.9 respectively, while the error of the dynamic stiffness correction coefficient method is only 2.9.
【作者单位】：浙江大学建筑工程学院;浙江大学唐仲英传感材料及应用研究中心;
【基金】：国家自然科学基金资助项目(51541810) 浙江大学唐仲英基金会资助项目
【分类号】：TU398.9
【正文快照】： 钢-混凝土组合梁能充分发挥混凝土的抗压性能和钢材抗拉性能,广泛应用于公路和铁路桥梁中.由于柔性剪力连接件的存在,在进行组合梁计算时,应考虑滑移的影响[1].聂建国等[2]及王景全等[3]分别采用折减刚度法和组合系数法来研究钢-混凝土组合梁的静力行为.文献[4-8]的研究结果表

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