中文摘要：

为了研究预应力度对弯箱梁桥的影响,以桥长、圆心角和预应力度为参数建立了180个二等跨连续弯箱梁桥模型,采用两步单参数拟合法进行数据处理,拟合出极限状态下控制截面上的应力、单位位移与圆心角、桥长和预应力度的显示函数关系.提出了弯箱梁桥截面上预应力度的计算公式,并选定了2个指标A、Δ来表征弯箱梁桥结构反应受预应力度影响趋势及程度。

英文摘要：

In order to study the influences of prestressing degree on curved box-girder bridges,180 two-span curved box-girder bridge models were built by taking bridge length,central angle and prestressing degree as parameters.Data-fitting was made with two-step one-parameter method,resulting in experimental formulas of stresses and unit displacements in control sections under limit states,so variation trends and degree varying with prestressing degree were studied.Formulas of prestressing degree in section were proposed;two indexes were advised to reflect the variation trend and degree of structural reactions varying with prestressing degree.