In order to study the calculation method of the compression bearing capacity of the inclined members of the transmission tower with joint constraints,the failure mode,bearing capacity,and deformation form of the arranged minimum axis and parallel axis of 120 equal angle steels were obtained through eccentric compression bearing capacity tests.In addition,the influence of different joint stiffness and joint types on their bearing capacity was studied.Combined with the current industry specifications,the calculation formula of the slenderness ratio of inclined members of transmission towers is proposed for different joint types(A,B,C).The results show that when the slenderness ratio is less than 120,the bearing capacity of the member is mainly controlled by eccentricity.A larger eccentricity indicates a lower bearing capacity.When the slenderness ratio is greater than 120,the bearing capacity of the member is mainly controlled by the joint stiffness.Larger joint stiffness indicates higher bearing capacity.A and C joint types have their own advantages at different slenderness ratios,but the bearing capacity of B joint type is always lower than that of A and C joint types.There is a great deviation between the calculated value of Chinese and foreign codes and the test value,and these codes have certain limitations,which are reflected in the insufficient eccentricity correction of small slenderness ratio members and insufficient joint stiffness correction of large slenderness ratio members.The calculation results of the proposed modified formula for slenderness ratio of inclined members are in good agreement with the test results and can be used to guide the engineering design.
关键词
输电塔/节点约束/节点构造型式/试验研究/长细比
Key words
transmission tower/joint constraint/joint type/experimental research/slenderness ratio
维普
万方数据