Based on the demands of two limit states, the design control equations of cross section for prestressed concrete beam are derived and the direct design method is presented.

根据两类极限状态的基本要求，建立了预应力混凝土梁截面设计的控制方程，提出了直接设计方法。

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It is also proved theoretically that the deduced method for fillet weld connections meets the requirements of the probabilistic limit states design procedures.

从理论上证明角焊缝连接的折算方法满足概率极限状态设计的要求。

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For the consideration of the fuzziness of limit states, the method of probabilistic integral is used for the calculation of fuzzy failure probability and fuzzy random reliability index.

对于极限状态的模糊性，基于概率积分法研究了模糊破坏概率及模糊随机可靠指标的求解方法。

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