Strength Evaluation of Jreel Members Using Tapered Plates And It's Design Method

变截面钢板(纵向异型材)在轧制方向上连续变化厚度，不需要对接焊接就可以得到变截面的梁。因此，在《公路钢桥设计导则》中提出的合理设计钢桥的有效手段之一就是采用锥形板翼缘。工字梁的锥形板翼缘可以建模为两边应力比恒定的优秀的锥形板。为了保持这种应力状态，考虑了与壁板厚度比、应力比和高宽比有关的附加剪切变形和剪应力。本文提出了受压变截面加筋板的分析算法，讨论了极限强度和上述比对强度的影响。此外，还提出了任意应力状态下变截面加筋板受压的分析算法和产生轴向应力的控制方法。利用弹塑性有限位移分析程序，采用新的算法和控制方法对加劲锥板进行了极限强度分析。在此基础上，对加筋板的极限强度和特点进行了讨论，并提出了新的设计方法。

Tapered plate (longitudinally profiled plate) is continuously varying its thickness in rolled direction and gives variable cross-section of girder without butt welding process. So using of tapered plate flanges is seemed one of effective means on the rational design of steel bridges suggested in the Design Guideline for the Steel Highway Bridges.Tapered plate flanges of I-section girder can be modeled as the outstanding tapered plate of that the stress ratio between both loading edges is defined constant. To keep this stress condition, the additional shear deformation and shear stress with some relations to the thickness ratio, stress ratio and aspect ratio of the panel are considered.In this report, the analytical algorithm for outstanding tapered plates in compression is suggested and the results of the ultimate strength and effectc of above ratios to the strength are discussed.Furthermore, the analytical algorithm for the stiffened tapered plates in compression in arbitrary stress states and the control method are suggested producing axial stress to stiffened tapered plates with adjustment panels. The ultimate strength analysis of the stiffening tapered plates with new algorithm and control method is carried out using elasto-plastic finite displacement analysis program. Consequently the results of the ultimate strength and characteristics of stiffened tapered plate are discussed and the new design method are suggested.