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Appropriate reliability methods for estimating the failure probability using most efficient and robust properties are crucial in structural reliability analyses of engineering structures. In this paper, an enhanced first-order reliability method (FORM) using conjugate search direction was coupled with artificial intelligence technique called support vector regression (SVR) named as SVR-CFORM for structural reliability analyses of complex limit state functions. The conjugate FORM (CFORM) is formulated using adaptive formulas to search the most probable point to improve the robustness of iterative FORM formula, whereas the SVR is used to predict the performance functions to improve the efficiency of the proposed reliability method. Several FORM formulas such as HL-RF, directional stability transformation method, and finite step length are used to compare the performance of the proposed SVR-CFORM in terms of both …