Shear lag and effective flange width of T-shaped short leg shear walls
Abstract
Short leg shear wall structure is a new-type residential structure, which is widely used in China, and T-shaped short leg shear wall is a commonly used member in this type structure. In order to research shear lag and effective flange width of T-shaped short leg shear walls, firstly, the longitudinal displacements were simplified as the combination of shear lag warping displacement, plane section bending displacement and longitudinal displacement induced by axial force. The additional deflection caused by shear lag effect was chosen as the generalized displacement, and quadratic parabola function was assumed as shear lag warping displacement. The principle of minimum potential energy was used to establish the computational theory of normal stress and deflection, meanwhile, the corresponding computational theories whose shear lag warping displacements were cubic and quartic parabola functions were both proposed respectively. Then, with numerical examples, the calculated values and FEM values of the flange normal stresses and deflections were compared. At last, based on the computational theory of normal stress, the computational theory of effective flange width was proposed. Moreover, the effective flange width was used to establish the computational theory of cracking load, and its accuracy was validated by the relevant experiments. Studies indicate that as for the flange normal stresses and deflections of each numerical example, the calculated values have a good agreement with FEM values; as for the cracking loads, the calculated values and the experiment values are in a good agreement.
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