نوع مقاله : پژوهشی
نویسندگان
1 دانشجوی دکتری سازه، دانشکدة مهندسی عمران، دانشگاه صنعتی شریف، تهران، ایران
2 دانشکده مهندسی عمران - دانشگاه صنعتی شریف
3 3- دانشجوی دکتری سازه، دانشکدة مهندسی عمران، دانشگاه صنعتی شریف، تهران، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The effective width is known as an important parameter in the analysis and design of non-rectangular reinforced concrete (RC) shear walls. Current design codes, i.e., ACI, CEN, UBC, and BS, propose a constant value for the effective width calculation of flanged sections, which proved to be conservative and ineffective in some cases. Of the conventional non-rectangular RC shear walls, the L-shaped sections have rarely been investigated in the technical literature. As the L-shaped RC shear walls can extensively be employed in view of structural and architectural reasons, a reliable assessment for the effective width of L-shaped sections is essential. Therefore, this paper attempts to propose applicable formulations for the effective width estimation of L-shaped RC shear walls. In that regard, a number of numerical investigations involving finite element analyses have been conducted in the ABAQUS software in order to evaluate the cyclic performance of L-shaped RC shear walls. The numerical results including the axial strain and displacement distributions have been attained for 42 L-shaped RC shear walls with three different aspect ratios, in which the shear-lag effects have been taken into consideration. In addition, on the basis of the evolutionary polynomial regression (EPR) analyses, applicable formulations have been established to be utilized for the initial estimation of the effective width evaluation of the L-shaped sections. The effectiveness of the proposed expressions has then been examined through assessing the R-factor of the estimations. On account of the average R-factor of 0.88, the capability of the proposed expressions has been ascertained in assessing the effective width of L-shaped sections. Moreover, in order to further highlight the unavoidable effects of level of axial loading and drift values on the variation of the effective width, different curves have been presented. Furthermore, calculating the mean absolute relative error (MARE) index demonstrates that the uniform distribution can well estimate the effective width of L-shaped RC walls.
کلیدواژه‌ها [English]
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