基于可靠性理论和风险-效益理论，以安全可靠指标以及经济优化为控制条件，即结构在满足安全可靠指标的情况下获得的净效益最大，计算既有结构的优化剩余使用寿命；

On the basis of the reliability and hazard-benefit theory, the residual service life of existing structure can be given taking into account the safe reliability and economic optimization.

youdao