用于底板t型连接锚杆的专用全方位角焊

Mahmoud Ali, Seyed Rasoul Mirghaderi, Amir Reza Ghiami Azad, Iman Karami
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引用次数: 1

摘要

在t型连接中,连接钢件与锚杆之间的偏心使底板成为受拉、受压较弱的构件。此外,底板上的超大孔导致锚杆位置不规则,从而导致不对称的剪切行为。因此,本文旨在开发一种特殊的全方位角焊缝,将底板下方的锚杆与钢部分同心连接,从而将底板从荷载传递链中移除。因此,首先根据欧洲规范的定向方法制定了考虑所有潜在破坏模式的设计准则。其次,通过实验工作对结果进行验证。数字图像相关技术(DIC)也被用来捕捉应变分布发展到试样破坏。为此,对特殊角焊缝的断裂强度和断裂角度进行了数值分析,并与相同焊缝体积的等效标准角焊缝进行了比较。结果表明,所提出的设计准则对所研制的专用全方位角焊缝进行了安全强度预测。此外,结果表明,采用特殊的全方位角焊缝代替等效标准焊缝,强度可提高约8% and improve the ductility of the weld. However, it decreases the stiffness of the weld by about 21%. The fracture surface occurred at 15°$$ {15}^{{}^{\circ}} $$ from the face of the anchor rod, which produced a higher strength than the predicted tensile strength calculated according to the theoretical throat plane.
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Special all-round fillet weld for anchor rods of base-plate T-stub connections
The eccentricity between connected steel parts and the anchor rods in base-plate T-stub connections makes base plates the weaker components in tension and compression. Additionally, the oversized holes in base plates lead to irregular placement of anchor rods, resulting in an unsymmetrical shear behavior. Thus, this paper aims to develop a special all-round fillet weld to connect the anchor rods beneath the base plate concentrically to the steel part, removing the base plate from the load-transferring chain. Accordingly, design criteria were first developed based on Eurocode's directional method considering all the potential failure modes. Next, results were validated by conducting experimental work. The digital image correlation technique (DIC) was also used to capture the strain distribution developed over the tested specimen till failure. Consequently, numerical analysis was carried out to investigate the fracture strength and the fracture angle and compare the special fillet weld with its equivalent standard one, which has the same weld volume. The results indicated that the proposed design criteria produced safe strength prediction for the developed special all-round fillet weld. Furthermore, the results revealed that using a special all-round fillet weld instead of the equivalent standard one can increase the strength by about 8% and improve the ductility of the weld. However, it decreases the stiffness of the weld by about 21%. The fracture surface occurred at 15 ° $$ {15}^{{}^{\circ}} $$ from the face of the anchor rod, which produced a higher strength than the predicted tensile strength calculated according to the theoretical throat plane.
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