舱内爆炸载荷下箱型梁船体节点结构强度分析

Strength analysis of box girder joint structures with frames subjected to internal blast loading

    摘要
  • 摘要:
      目的  为了研究箱型梁典型节点结构在舱内爆炸下的结构强度，
      方法  基于ANSYS/LS-DYNA显式动力有限元软件，首先建立箱型梁船体舱段结构的有限元模型。然后，采用ALE算法开展舱内爆炸载荷下舷侧箱型梁与强横梁连接处不同型式节点结构的动态响应数值计算。最后，在给定的炸药当量和爆点位置情况下，获得舱室结构的整体变形和破坏模式，并分析在不同节点结构设计方案下典型位置的应力特征。
      结果   计算结果表明：舷侧箱型梁与强横梁连接处圆弧式和肘板式节点结构的应力峰值与甲板破口尺寸基本相当；从舱壁撕裂长度来看，肘板式稍逊于圆弧式，在中间箱型梁与强横梁连接处，圆弧连接最优，单侧肘板次之，双侧肘板最差。
      结论   所得到的数值计算结果可为箱型梁节点连接结构的工程应用提供有益的参考。

     

    Abstract:
      Objectives  In order to investigate the strength of the joint structure of box girders under internal explosion,
      Methods  this paper use the explicit dynamic finite software ANSYS/LS-DYNA to establish a large complex typical cabin model. Numerical investigations are then conducted to analyze the dynamic response of different forms of joint structure under internal explosion using the ALE algorithm. The whole deformation/failure mode of cabin structures with the same charge mass and detonation position is obtained. A comparison of stress level at typical positions is then carried out in detail.
      Results  The results show that the arc-arc type joint has a lower stress level compared to the bracket at the broadside. In the central position where a box girder is connected to a web beam, the arc-arc joint form is better than the other two.
      Conclusions   The findings of this paper can provide useful references for the engineering application of joint structures.

     

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