中文摘要：

为了研究大跨静定桁架结构基于满位移最小重量设计的方法，建立了大跨静定桁架的位移计算公式，然后利用柯西不等式，获得了满足容许位移条件下最小重量设计的临界条件，进而定义了用量分配系数，按此系数对截面进行设计，可得到基于满位移约束下的最小重量设计方案。应用上述系数分配方法对一个具体的静定桁架结构工程实例进行了计算分析，并同满应力设计结果进行了对比。研究结果表明，所提出的实现大跨静定桁架结构基于满位移的最小重量设计方法——系数分配法是正确、可靠和有效的。

英文摘要：

The minimum weight design method of large - span statically determinate trusses based on ity. Moreover, distribution coefficient of material wastage, which was used to obtain the minimum weight design, was defined. An engineering example was analyzed using the coefficient distribution method mentioned above, and the results were compared with those given by the full stress design method. The study showed that the proposed method, coefficient distribution method, was correct, reliable and effective.