矩形高强钢管混凝土壁板弹塑性屈曲及宽厚比限值解析解

钢管混凝土壁板的局部屈曲可通过限制其宽厚比来避免.为了得到矩形高强钢管混凝土柱壁板的宽厚比限值,将其简化为受混凝土单侧约束板,以薄板的弹塑性局部屈曲理论为基础,采用Bleich近似计算方法和Ramberg-Osgood高强钢材本构模型,推导出了受单侧约束板在均布压应力作用下的弹塑性屈曲应力,得到了矩形高强钢管混凝土柱壁...

Analytical solution of elastic-plastic buckling and width-to-thickness ratio limits of rectangular CFST with high-strength steel panels

The local buckling of concrete-filled steel tube panels can be avoided by limiting their width-to-thickness ratio. To obtain the width-to-thickness ratio limits of rectangular concrete-filled high-strength steel tube panels, this paper simplified the panel to a rectangular thin plate with unilateral constraints of concrete. Based on the elastic-plastic local buckling theory, using the Bleich approximate calculation method and the Ramberg-Osgood constitutive model for high-strength steel, the elastic-plastic buckling stress of plate with unilateral constraints under uniform axial pressure was derived, and the analytical solution of width-to-thickness ratio limits was obtained. Furthermore, the finite element models were used to simulate the axial compressive behavior of 168 rectangular concrete-filled high-strength steel tubes with a yield strength of 460 MPa to 960 MPa and a width-to-thickness ratio of 20 to 60. The reliability of the analytical solution of the width-to-thickness ratio limits proposed in this paper was verified by the simulated results and the existing test results. Compared with the current codes, the analytical solution of the width-to-thickness ratio limits proposed in this paper is only 3% different from that of BS EN 1994-1-1. Both of them take into account the influence of elastic-plastic behavior of steel and have a clear concept, which are safer and more reasonable than the provisions of the width-to-thickness ratio limits of the rectangular concrete-filled steel tube panels in other current codes.