内压载荷下复杂薄壁箱形结构承载能力的试验研究

薄壁装配式不锈钢水箱是近年来广泛使用的一种新型复杂薄壁箱形结构,文中对其承载能力进行试验研究,得到箱壳构件在冲压前后不同区域的各项力学性能指标,发现模压板球冠区域的屈服强度增加高达42%;获取内压载荷下箱体各控制部位的力学响应特性,箱体各模压板块中与加强槽毗邻的球冠边缘区域的应力始终占主导地位;发现这种薄壁结构存在底部模压板失稳、包角渗漏和斜拉筋拉脱等3种失效模式,模型箱体底板的屈曲临界载荷在0.050 MPa～0.055 MPa.

EXPERIMENTAL STUDY ON THE STRENGTH OF COMPLEX THIN-WALLED STRUCTURES UNDER INTERNAL PRESSURE

Rectangular thin-walled structures made of stainless molded units and reinforced with stiffeners have been drawing increasing attentions in drinking industry and water tower applications in recent years.For their complex geometry,analytic solution based on elastic-plastic theory is almost impossible.An experimental investigation on the strength of assembled thin-walled water-tank(ATWWT),which is a typical complex rectangular thin-walled structure subject to internal pressure load was carried out.To investigate the strength and the deformation characteristics of its molded units,a total of 13 tensile samples were tested,and an increase of yield strength up to 42% was found.And the mechanical response of a prototype ATWWT was obtained,where the largest Mises equivalent stress of the control points was located between the convex face and the plain region of the molded units.The failure modes of the protoype ATWWT were found to be buckling of bottom molded units,leaking at the corner of the molded units and fracture of stiffeners.