本文通过对作者所在单位的螺旋压力机上模锻件的数据调查，给出了设计所需的各种材料和尺寸的结构要素极限图表。
The limitation diagram of key structural elements in design of screw-press for various materials and sizes is given through the data investigation of die forging on screw press.
本文编制了网架结构优化设计和极限分析的计算程序。并对网架结构进行了分析。
In this paper, the calculation program of optimal design and ultimate analysis of truss structures is worked out.
由于此类结构形式的复杂性，目前对于非杆系结构极限状态的确定及其设计方法尚没有统一的认识。
Since the complexity of this kind of structure types, the research on the design methods of the structures is still immature.
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