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首页> 外文期刊>Transportation Research Record >Influence of Cutout Geometry on Stresses at Welded Rib-to-Diaphragm Connections in Steel Orthotropic Bridge Decks
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Influence of Cutout Geometry on Stresses at Welded Rib-to-Diaphragm Connections in Steel Orthotropic Bridge Decks

机译：正交异性钢桥面板中切口几何形状对肋-膜片焊接连接处应力的影响

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摘要

The geometry of the cutout at the intersection of longitudinal ribs and transverse diaphragm plates in steel Orthotropic bridge decks can have a significant impact on the stress in the region of the welded rib-to-diaphragm connections. Many different approaches to detailing this connection have been tried, with mixed success. To provide additional guidance to designers, a finite element parametric study that systematically investigated the effect of altering the geometry of certain variables was performed. Parameters considered included overall cutout shape, cutout depth, diaphragm plate thickness, and deck plate thickness. Results indicate that the suggested cutout geometry shown in the current (2002) AASHTO LRFD Bridge Design Specifications for closed-rib ortho-tropic bridge decks produces increased stresses on this fatigue-sensitive connection. An improved geometry is proposed to replace that currently presented in the specification. Results of this study indicate that larger cutout geometries offer less resistance to out-of-plane displacements induced by longitudinal rib rotations. As a result, out-of-plane stresses are decreased at the connection. However, cutouts that are excessively deep will increase in-plane stresses at the welded rib-to-diaphragm connection. If the cutout is too shallow, out-of-plane stresses may become prohibitively high owing to restraint of longitudinal rib rotations. Cutouts that are between 1/3 and 1/2 the depth of the rib with transition radii at the top of the cutout of 50 to 75 mm and vertical cuts are most favorable. The cutout geometry shown in the AASHTO LRFD specification results in an overstiff cutout detail. A proposed improved geometry is presented.
机译：正交异性钢桥面板中纵向肋骨和横向隔板的相交处的切口几何形状可能会对肋骨-膜片焊接区域的应力产生重大影响。已经尝试了许多详细说明这种连接的方法，但都取得了不同的成功。为了给设计人员提供更多指导，进行了有限元参数研究，该研究系统地研究了更改某些变量的几何形状的影响。考虑的参数包括整体切口形状，切口深度，隔板板厚度和盖板厚度。结果表明，当前（2002年）AASHTO LRFD正交异性桥梁桥面桥梁设计规范中显示的建议切口几何形状会在此疲劳敏感连接上产生更大的应力。提出了一种改进的几何形状来代替当前在说明书中提出的几何形状。这项研究的结果表明，较大的切口几何形状对由纵向肋骨旋转引起的面外位移的抵抗力较小。结果，减少了连接处的平面外应力。但是，过深的切口会增加在焊接的肋骨到膜片连接处的平面应力。如果切口太浅，则由于限制了肋的纵向旋转，面外应力可能会过​​高。最合适的切口是肋骨深度的1/3至1/2，切口顶部的过渡半径为50到75 mm，并且垂直切口最为合适。 AASHTO LRFD规格中显示的切口几何形状会导致过硬切口细节。提出了一种改进的几何形状。

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