中文摘要：

由于缺乏足够的试验统计数据，目前对于索结构中拉索构件的设计强度多采用以经验为主的允许应力法确定，或在形式上采用分项系数，但具体数值仍按允许应力法推算，这与当前以概率极限状态法为基础的规范设计体系是不协调的。收集大量的钢拉杆与钢绞线试验数据，通过数理统计得到两种拉索材料的抗力分布模式，考察影响构件抗力的不确定性因素的统计特性；验证拉索结构的荷载效应与外荷载之间存在近似线性关系，通过引入荷载效应比以及荷载、抗力的均值等统计量，将荷载抗力分项系数表达式等价为极限状态方程的形式，采用基于一次二阶矩理论的验算点法对两种拉索进行可靠度分析。最后分别给出适于工程应用的钢拉杆与钢绞线的抗力分项系数，为今后相关规范的修订提供参考。

英文摘要：

Due to lack of experimental statistical data, most practical design codes for cables are based on either the empirical ‘Allowable Stress Design （ASD） ＇ method or such method taking the form of the so-called ‘Load Resistance Factor Design （LRFD）＇ approach. However, these two cable design methods are not appropriate for the current design codes that should be based on structural reliability analysis. In order to solve this problem, a great deal of statistical data about high strength steel rods and spiral strands have been gained to find out the probability distribution of these two kinds of cable materials, and the uncertain factors that influence structural resistance are analyzed simultaneously. The equation which takes the combination of simple load effects into account with partial factors can be changed into a limit state equation by adopting proportions of load effects, which are proved to have an approximate linear relationship between loads and effects. The partial factors for high strength steel rods and spiral strands are eventually obtained based on the First-Order Second-Moment （FOSM） theory, and they may serve as a reference for the amendment of structural design codes.