轴向压力下刚性支承矩形钢板件屈曲弹性分析

通过对钢管混凝土中外包钢管板件的屈曲弹性分析，目的在于研究钢管内填混凝土后钢板件的抗屈曲能力．在钢管混凝土中，核心混凝土可以被看作刚性材料；对于组成钢管的矩形钢板件而言，当其与刚性材料并置时钢板的屈曲仅发生外凸．根据小挠度理论，用迦辽金方法计算具有刚性支承的矩形板件的弹性屈曲，并得到了屈曲系数k．计算结果表明：由于核心混凝土的存在，钢管抵抗屈曲的能力比无内填混凝土的空钢管抵抗屈曲的能力有显提高．

Elastic buckling analysis of rectangular unilaterally rigid restrained plates under axial compression

Concrete filled steel tube columns have been widely used in civil engineering throughout the world in recent years. The major purpose of the paper was to investigate the resistance capability of plates to local buckling in concrete filled steel tube by elastic buckling analysis of steel plates. As for concrete filled steel tubes, concrete core could be regarded as a rigid material .For steel plates, this can occur when a thin steel plate is juxtaposed with rigid materials, and the steel may only buckle locally away from the rigid materials. This paper presented a Galerkin method of the local buckling analysis of rectangular unilaterally rigid restrained plates in compression based on small deflection theory. The result indicated the steel plates were restrained by the concrete core, which improved remarkably the ability of anti resistance of plates to local buckling than steel tubes without in filled concrete.