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Axial tension load-bearing elements are widely used in major steel structures, such as flat trusses, space trusses and truss and so on. These components at the nodes connected to other components , it is often only part of the cross-section is directly connected with the gusset plate . Then the member section section under load , will produce uneven stress distribution , called shear lag . Net section shear strength of the member lag can not fully play out , a larger capacity reduction . \To better understand the shear lag on the axial strength of tension members , this article from the following aspects were studied. First introduced Whitmore (1952) stress the concept of diffusion , stress diffusion method using several common elements gives the shear lag factor formula. Then , according to the relevant test data, test results and the results were compared with foreign standards . The results showed that the U.S. norms (ANSI / AISC 360-10) and Canadian norms (CSA/CAN-S16-01) can better predict the strength members to consider shear lag , its way of thinking for China's steel design specifications reference . Meanwhile , with the finite element analysis software , to establish a board , angle, channel and beam finite element model for a parametric analysis and made a simple formula. From the analysis results, the length of the connection member , Eccentric , steel grade and so on shear lag greater impact. Finally, the stress diffusion method were analyzed and summarized the formulas and parameters and testing, finite element, U.S. Code, Canadian normative values ??were compared, the results showed that the two methods and other methods conform better, has better applicability and usefulness .
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