输电铁塔单双角钢变换节点试验研究与承载力计算方法

BEARING CAPACITY CALCULATION METHOD AND EXPERIMENTAL STUDY OF THE KEY CONVERSION JOINTS OF SINGLE-ANGLE AND DUAL-ANGLE STEEL FOR POWER TRANSMISSION TOWER

主要针对架空输电线路铁塔设计中常用的单双角钢变换节点进行承载力研究,建立其力学模型,对节点强度和稳定性进行理论分析,提出节点水平连接板板厚的计算方法,给出节点荷载传递系数。对不同板厚的单双角钢变换节点进行足尺试验和有限元分析,并将试验结果与有限元结果进行对比分析,二者吻合较好,验证了单双角钢变换节点的荷载传递机理,同时验证了水平连接板设计计算方法的可行性。

The paper focused on the bearing capacity of the key conversion joint of single-angle and dual-angle steel in the ultra-high-voltage power transmission tower design. The mechanical model was built to conduct a theoretical analysis on the strength and stability of key conversion joints,a method to calculate the thickness of horizontal connection plate for the joints was also presented,so as to obtain the joint load transfer coefficient. The full-scale test and the finite element analysis for the conversion joints of single angle-and dual-angle steel with different plate thickness were conducted.Meanwhile,a comparative analysis on the experimental and finite results was implemented to figure out the source of error and verify the load transmission mechanism in the key conversion joints of single-angle and dual-angle steel. In addition,the feasibility of the method for the design and computation of horizontal connection plate was verified.