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塑性设计分析(PDA)是新近发展起来的﹑基于钢框架结构侧向设计的直接位移法进行分析的方法。PDA是改进传统塑性分析与设计后的方法。当传统塑性分析与设计只能对破坏时的极限载荷进行估算时,PDA已经发展到可以处理倒塌初期的P-Δ效应、塑性铰顺序、侧向位移等重大设计问题。这与在结构中次框架整体刚度的最大临界目标值有关,然后通过结构构件提供尽可能大的承载力的方法实现的。这种方案包括几个可以随时对构件尺寸进行重新调整的初步设计。与此同时也介绍了一种预测塑性铰形成顺序的实践方法。文章基于若干已有的设计理念和一些从未出现在文献中的新公式对PDA进行了介绍。
Plastic Design Analysis (PDA) is a newly developed method based on the direct displacement method of lateral design of steel frame structure. PDA is to improve the traditional method of plastic analysis and design. When the traditional plastic analysis and design can only estimate the ultimate load at failure, the PDA has been developed to deal with the major design problems of P-Δ effect, plastic hinge order and lateral displacement in the initial stage of collapse. This is related to the maximum critical target value of the overall stiffness of the sub-frame in the structure, which is then achieved by providing structural members with as much bearing capacity as possible. This solution includes several preliminary designs that allow component size to be readjusted at any time. At the same time, a practical method of predicting the order of plastic hinges is also introduced. The article describes the PDA based on several existing design concepts and new formulas that have never been seen in the literature.