Improved Response Surface Method Based on Linear Gradient Iterative Criterion

Aiming at the problem of big calculation error in solving reliability index by traditional response surface method, an improved method based on linear gradient iteration criterion is proposed. First, proposed to reduce step size with increase times. It will improve fitting accuracy and lead a better convergence while approaching limit state surface. Then, reduction coefficient iterative studied. The optimal value 0.2. get more accurate quickly. Examples show that has obvious advantages high efficiency. application this can also be expanded other similar engineering structure.