Experimental and numerical study on the effective length of tower cross bracing
Experimental and numerical study on the effective length of tower cross bracing
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DOI：
10.1016/j.tws.2022.110296
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发表时间：
2023-01
影响因子：
6.4
通讯作者：
Zulin Huang;Hongjun Liu;Jingyao Zhang;Z. Li;M. Ohsaki;Q. Bai
中科院分区：
文献类型：
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作者：
Zulin Huang;Hongjun Liu;Jingyao Zhang;Z. Li;M. Ohsaki;Q. Bai
在此基础上，提出了输电塔常用横撑计算长度系数的新设计公式。共进行了22个结构试验，考虑相互作用的交叉支撑的屈曲。报告了试验结果，包括失效模式和载荷响应历史。进行了数值模拟，并使用多重比较进行了验证。我国规范DL/T5154计算的极限强度不够准确。基于校准的有限元模型进行了广泛的参数研究，以调查几个影响参数。隐式理论方程的有效长度制定和评估。数值结果随后被用来获得一个新的设计公式与应力比的有效长度系数。结果表明，采用分段线性拟合方法得到的极限强度计算公式，提高了极限强度预测的一致性和可靠性。
Based on the present study, a new design formula for the effective length coefficient of the commonly used cross bracing in transmission towers is proposed. A total of 22 structural tests were conducted considering the interaction in the buckling of cross bracing. The test results, including the failure modes and load-response histories, were reported. The numerical simulations were conducted and validated using multiple comparisons. The ultimate strengths, calculated by the Chinese design code of DL/T 5154, are not sufficiently accurate. An extensive parametric study based on a calibrated finite-element model was conducted to investigate several influential parameters. Implicit theoretical equations for effective length were formulated and evaluated. The numerical results were subsequently used to obtain a new design formula for the effective length coefficient associated with the stress ratios. It is shown that the proposed formula, which was obtained from piecewise linear fitting, improves the consistency and reliability of the prediction of the ultimate strength.