中文摘要：

以桥长和圆心角为参数建立了30个二等跨连续弯箱梁桥模型,采用非线性函数拟合法进行数据处理,拟合出跨中和支座处不同荷载单独作用时的控制截面角点上的正应力与圆心角、桥长之间的显式函数关系.用函数各变量间的符号关系表达出截面正应力受变量影响的变化趋势和程度,定性、定量地总结出各种荷载作用下截面正应力随2个参数的变化规律,并对工程设计提出建议和借鉴依据.

英文摘要：

The bridge length and central angle are taken as the parameters to build 30 two-span curved box-girder bridge models.The explicit experimental formulas between the normal stresses of corner points in control sections under different loads and the two parameters is fitted with the nonlinear function method.The sign relationship between variables is used to show the variation trends and degrees of normal stresses influenced by those parameters,and the rules of the normal stresses changing with the parameters under different loads are qualitatively and quantitatively discussed.Advices are finally provided for engineering design.