一、概述 建筑结构试验数据处理的问题中,多为非线性回归分析。如以目前用量最大的钢筋混凝土结构为例,它的荷载变形曲线,其形状也有低度的弯曲。为了使用方便,常把它近似作为直线处理。但载荷更大,特别是临近破坏前,显然不可也不应用直线去代替。此外,钢筋混凝土结构的多种性质,如徐变、松弛、干缩等也为非线性变化。因而对上述种种实测数据配制曲线的非线性回归问 I. Overview The problems in the processing of building structure test data are mostly nonlinear regression analysis. For example, the reinforced concrete structure with the largest amount of current use has its load deformation curve and its shape has a low degree of curvature. For ease of use, it is often approximated as a straight line. However, the load is even greater, especially before approaching destruction. Obviously, it must not be replaced by a straight line. In addition, various properties of reinforced concrete structures, such as creep, relaxation, shrinkage, etc. are also non-linear changes. Therefore, the nonlinear regression of the above mentioned data preparation curve