体外预应力技术是加固既有钢筋混凝土桥梁结构最有效的方法之一。
External prestressing is one of the most effective methods to strengthen bridge.
本文针对既有钢筋混凝土桥梁的特点，对可靠性评估的若干重要问题进行了研究，主要内容如下。
In this paper, to aim at the characteristics of existing highway reinforced concrete Bridges, some topics of reliability assessment are studied. The major contents are summarized as follows.
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