中文摘要：

高跨比作为连续刚构桥的一个重要设计参数,以往主要采用经验类比或试算法确定,具有一定的局限性。为了得到高跨比的线性数值关系,通过分析近百座连续刚构桥的高跨比数据,利用最小二乘法拟合出了箱梁根部梁高h、跨中梁高t同主跨径L之间的计算公式,并以8个工程实例为依据,将有限元模型分析理论值、实桥设计值同本文的公式计算值进行对比,验证了本文高跨比计算公式的正确性,为大跨径连续刚构桥高跨比的设计提供一定的借鉴。

英文摘要：

The height-span ratio is an important design parameter of the continuous rigid frame bridge,which is based on the experience analogy or the trial calculation method before,and these methods have some certain limitations. In order to get the linear numerical relation of the high-span ratio,this paper analyses the heightspan ratio data of nearly 100 continuous rigid frame bridges and fits an calculating formula between the height in the box girder root（ h）,the height in the middle span of the box girder（ t） and the main span（ L） by least square method. Then compares the height-span ratio parameter with the model of the theoretical values,real bridge design values and empirical formula＇ calculated values based on 8 engineering examples and verifies the correctness of the calculation formula in this paper,which can provide some references for the high-span ratio＇s design of the long-span continuous rigid frame bridge.