The ultimate strength of stiffened plates subjected to combined biaxial compression and lateral loads has not been widely investigated yet by experiments. In this study, both experimental and numerical analyses were performed to study the ultimate strength and collapse behaviors of stiffened plates under the combined biaxial compression and lateral loads. And the experimental set-up provides reference for combined loads experiments. The initial deformation of the experimental specimens has been measured by laser scanning technique and taken account in the nonlinear finite element analysis. Collapse modes have also been analyzed and compared, and influences of the interaction of lateral and transverse loads on the ultimate strength have been investigated. Results show that lateral pressure would enhance the ultimate load-carrying capacity when the lateral pressure restrained deformation. And the collapse mode was the combination of local web buckling and lateral-torsional buckling of stiffeners when transverse loads were dominant load components.

经受双轴压缩和侧向载荷作用的加劲板的极限强度尚未通过实验进行广泛研究。在这项研究中，进行了实验和数值分析，以研究加筋板在双轴压缩和侧向荷载共同作用下的极限强度和坍塌行为。实验设置为组合载荷实验提供了参考。实验样品的初始变形已通过激光扫描技术进行了测量，并在非线性有限元分析中予以考虑。还对倒塌模式进行了分析和比较，并研究了横向和横向载荷相互作用对极限强度的影响。结果表明，当侧向压力抑制变形时，侧向压力会提高极限承载力。当横向荷载为主要荷载分量时，倒塌模式是加劲肋的局部腹板屈曲和横向扭转屈曲的组合。