Abst'/> Plastic collapse load prediction of cracked circular hollow section T/Y-joints under in-plane and out-of-plane bending
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Plastic collapse load prediction of cracked circular hollow section T/Y-joints under in-plane and out-of-plane bending

机译：面内和面外弯曲下圆形中空截面T / Y型接头塑性破坏载荷预测

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AbstractThe plastic collapse loads of cracked circular hollow section (CHS) T/Y-joints under in-plane and out-of-plane bending are investigated using finite element (FE) analyses. An in-house 3D FE mesh generator is specifically developed to create the mesh models of the cracked joints containing a semi-elliptical surface crack located at the weld toe of the chord. Mesh convergence tests are then carried out to check the accuracy of the generated mesh models. The in-plane and out-of-plane plastic collapse moments of uncracked CHS T/Y-joints are calculated and compared with results obtained from three codes and experimental data. The comparison shows that the plastic collapse moments of uncracked CHS T/Y-joints obtained in this study are accurate and reliable. Subsequently, an extensive parametric study is carried out to investigate the plastic collapse moments of cracked CHS T/Y-joints under in-plane and out-of-plane bending. It is found that the in-plane and out-of-plane plastic collapse moments may decrease by up to 35.1% and 33.6% respectively when the crack areaAncreaches 25% of the intersectional area,t0*lw. Finally, two lower bound strength reduction factorFARequations for cracked CHS T/Y-joints under in-plane and out-of-plane bending are proposed.Highlights•Develop a generator to create FE mesh models of cracked CHS T/Y-joints containing a surface crack.•Provide various mesh refinement schemes in the in-house mesh generator.•Investigate the plastic collapse moments of cracked CHS T/Y-joints under in-plane and out-of-plane bending.•Crack area has the most significant influence on the plastic collapse moments of cracked CHS T/Y-joints.•Propose two lower bound strength reduction factor equations.
机译： 摘要 破裂的圆形空心截面（CHS）T / Y接头在面内和面外弯曲下的塑性塌陷载荷使用有限元（FE）分析进行研究。专门开发了内部3D FE网格生成器，以创建包含位于弦的焊趾处的半椭圆形表面裂纹的裂纹接头的网格模型。然后进行网格收敛测试以检查生成的网格模型的准确性。计算未破裂的CHS T / Y接头的面内和面外塑性破坏力矩，并将其与从三个规范和实验数据获得的结果进行比较。比较表明，本研究获得的未破裂CHS T / Y接头的塑性破坏力矩是准确而可靠的。随后，进行了广泛的参数研究，以研究破裂的CHS T / Y接头在平面内和平面外弯曲下的塑性破坏力矩。结果发现，当裂纹面积 A nc 到达交叉区域的25％， t 0 * < ce：italic> l w 。最后，在平面内破裂的CHS T / Y接头的两个下限强度降低因子 F AR 方程 突出显示 • 开发一个生成器，以创建包含表面裂缝的破裂CHS T / Y接头的有限元网格模型。 • 在内部网格生成器中提供各种网格细化方案。 • 研究破裂的CHS T / Y接头在平面内和平面外弯曲下的塑性破坏时刻。 • 裂纹区域对裂纹的CHS T / Y接头的塑性塌陷力矩影响最大。 • 提出两个下限强度折减系数方程。

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