纯剪切横向密加筋板的加筋弯曲刚度门槛值

针对由横向密加筋板组成的散货船舷侧板承担着较大的面内剪切载荷，而散货船共同结构规范中加筋弯曲刚度设计考虑的是舷外水压力,并没有考虑剪切载荷的问题,研究在剪切载荷作用下横向密加筋板的加筋弯曲刚度门槛值.通过改变加筋的高度，可以改变加筋弯曲刚度，从而使加筋板的剪切屈曲强度和极限强度也随之变化.根据加筋板的纯剪切弹性屈曲强度和极限强度等于材料的剪切屈服极限，找出2种加筋弯曲刚度的门槛值，并把这2种加筋弯曲刚度值与AASHTO规范所得值进行对比分析.结果表明，应由剪切极限强度分析来确定横向密加筋板的无量纲加筋弯曲刚度门槛值.

Threshold Value of Stiffener Bending Rigidity of Transverse Densely Stiffened Plate Under Pure Shear

Side shells of bulk carriers composed of transverse densely stiffened plate are subjected to large in plane shearing forces, however stiffener bending rigidity is designed not according to shearing force but according to lateral pressure based on IACS common structural rules for bulk carriers. So it is necessary to investigate the threshold value of stiffener bending rigidity for the stiffened plate under shearing loads. Pure shear buckling strength and ultimate strength of transverse densely stiffened plates with different stiffener bending rigidities were investigated. Then the two kinds of stiffener bending rigidity threshold values were identified respectively when the two kinds of strength of stiffened plate reach the material shear yield limit, which were compared with the calculating value based on AASHTO specifications. The result indicates that the stiffener bending rigidity should be decided by ultimate strength analysis.