U型加劲肋加固的高强钢面板体系的面内极限抗压强度

通过非线性有限元分析(FEA)研究使用U型加固件纵向加劲的面板的极限抗压强度。对112个由各种细长参数的面板和柱以及加固件组成的模型进行分析。模型包括了普通钢材和高强钢的弹塑性应变硬化本构关系。有限元分析中也包括了初始几何缺陷和残余应力。将有限元分析得出的结果与欧洲规范3EN1993-1-5、FHWA-TS-80–205和其他可用公式计算出的强度进行比较。基于分析结果,可得出一个针对使用普通钢材或高强钢(HPS)加劲板系统的新的强度预测公式。结果表明:当柱的长细比较大时,使用欧盟规范3EN1993-1-5和FHWA-TS-80–205可能导致设计过于保守;而采用所提出简化形式的公式可更精确地预测强度,从而得出更经济的设计。

In-Plane Ultimate Compressive Strengths of HPS Deck Panel System Stiffened with U-Shaped Ribs

The ultimate compressive strengths of deck plates stiffened longitudinally by U-shaped stiffeners have been investigated by the nonlinear finite element analysis ( FEA ) .A total of 112hypothetical models with various combinations of slenderness parameters for the deck plates and column slenderness parameters for the stiffeners were modeled and analyzed.Both conventional and high performance steels were considered in models following elasto-plastic strain hardening constitutive relationships.Initial geometric imperfections and residual stresses were also incorporated in the FEA.Numerical results from FEA have been compared to compressive strengths from Eurocode 3EN 1993-1-5 , FHWA-TS-80–205 , and other available formulas. Based on analysis results , new unified strength predictor equations have been developed for the stiffened plate systems with conventional steel and / or high performance steel ( HPS ) .It has been found that use of Eurocode 3EN 1993- 1-5and FHWA-TS-80–205may lead to highly conser-vative design when large column slenderness parameters are encountered.The proposed equations have simple forms yet provide accurate strength predictions resulting in more economic design.