然后，根据目标可靠度，对桥梁体系的寿命做出初步预测。
Then, prognosticates the residual life of the bridge system through the reliability index.
以总费用最小为目标，研究结构可靠度。
The structure reliability is analyzed with the object that the cost is minimum.
以总费用最小为目标，研究结构可靠度。
The structure reliability is analyzed with the object that the cost is minimum.
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