中文摘要：

针对桥梁桁架实际设计中，零件结构尺寸、外部栽荷的不确定性对结构设计的影响，采用概率设计与有限元技术相结合，通过参数化建模，运用响应面法构造了近似函数，对桥梁桁架弯曲应力和挠度进行了概率设计．与传统的确越性设计结论相比，表明采用概率法对桥梁桁架进行设计，其设计结果更符合实际情况．图3，表1，参8．

英文摘要：

Aiming at structural design influence of part physical dimension and uncertainty of exterior load, response surface and several statistic parameter analyse of bridge truss structure bending stress and deflection was proceed by means of probability design and finite element method. FEM model was set up through parameter. Approximation function was constructed by response surface method. The probability design is more effective and more conformable to practical uses. 3figs., ltab., 8refs.