Most of recent domestic design codes of engineering structures have adopted the Probability-Based Limit State design Method.

当前的工程结构设计，在国内的结构设计规范中，多已采用以概率理论为基础的极限状态设计法。

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This paper illustrates the economical merit of the limit state design method that could be won in a railway and highway bridge.

本文提出以极限状态的观点进行公铁两用桥设计，会收到良好的经济效果。

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So studying reliability of rainwater pipe network and adopting probability limit state design method based on reliability theory to design rainwater pipe network have important actual meanings.

因此，研究雨水管网的可靠性，采取基于可靠性理论的概率极限状态设计法来设计雨水管网有着重要的实际意义。

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