一种计算组合梁徐变和收缩效应的新方法

发布时间：2018-07-17 05:27

【摘要】：为准确方便计算钢-混凝土组合梁徐变和收缩效应,预估组合梁的长期力学性能,采用直接法推导了组合梁材料换算系数、徐变调整系数和收缩调整系数,获得组合梁时随应力公式,可根据材料力学中单一材料的力学公式计算组合梁截面应力.算例分析表明:采用直接法计算组合梁截面纤维应力结果与采用内力分配法计算的结果符合性很好.直接法适用性非常广,适用于正弯矩下的简支组合梁、框架组合梁和预应力组合梁等,根据不同的约束形式和荷载类型给定组合梁截面形心处的内力值,可计算相应的时随调整系数、截面应力和应变.该方法简单实用,是对组合梁长期力学计算方法的一种有效补充,可直接应用于工程实用计算.
[Abstract]:In order to calculate the creep and shrinkage effects of steel-concrete composite beams accurately and conveniently, and to predict the long-term mechanical properties of composite beams, the material conversion coefficient, creep adjustment coefficient and shrinkage adjustment coefficient of composite beams are derived by direct method. According to the mechanical formula of single material in material mechanics, the cross section stress of composite beam can be calculated. The numerical examples show that the results of fiber stress calculation of composite beams by direct method are in good agreement with those calculated by internal force distribution method. The direct method is suitable for simply supported composite beam, frame composite beam and prestressed composite beam under positive bending moment. According to the different constraint form and load type, the internal force value at the center of section of composite beam is given. The corresponding time dependent adjustment coefficient, cross section stress and strain can be calculated. The method is simple and practical, and it is an effective supplement to the long-term mechanical calculation method of composite beam, and can be directly applied to practical engineering calculation.
【作者单位】：云南民族大学电气信息工程学院;昆明理工大学建筑工程学院;
【基金】：国家自然科学基金资助项目(51468026,51668027)
【分类号】：TU398.9

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