基于实测数据的混凝土曲线梁桥温差代表值研究

Research on representative value of temperature difference of concrete curved beam bridge based on measured data

针对曲线梁桥在温度荷载作用下产生竖向变形、切向位移和横向位移,且横向位移严重影响曲线梁桥安全性与耐久性的问题,为确定曲线梁桥日温差的分布规律,用光纤传感器对一座沥青铺装的预应力混凝土在役曲线梁桥进行1 a的温度数据实时监测,并采用聚类分析、参数估计和假设检验等方法对曲线梁桥温差代表值进行分析计算。研究结果表明:沥青铺装预应力混凝土在役曲线梁桥竖向和横向日最大正温差服从两参数的Weibull分布,竖向日最大正温差标准值为21.7℃,频遇值为21.4℃,准永久值为20.3℃。横向日最大温差标准值为14.1℃,频遇值为13.7℃,准永久值为12.6℃,横向温差标准值占竖向的64.9%,对中原区域曲线梁桥设计计算中温度的取值提供了依据。

For the curved beam bridge under the action of temperature load,vertical deformation,tangential displacement and lateral displacement will occur,and the lateral displacement will seriously affect the safety and durability of the curved beam bridge.In this paper,a fiber-optic sensor was used to monitor the prestressed concrete in-service curve beam bridge of an asphalt pavement in real time.And a year temperature data was recorded.The representative values of the temperature difference of the curved beam bridge were analyzed and calculated by cluster analysis,parameter estimation and hypothesis testing.The results show that the vertical and horizontal maximum positive temperature difference of the in-service curved beam bridge of asphalt pavement obeys the two-parameter Weibull distribution.The vertical maximum daily positive temperature difference is 21.7℃,the frequency value is 21.4℃,and the quasi-permanent value is 20.3℃.The horizontal maximum daily temperature difference is 14.1℃,the frequency value is 13.7℃,and the quasi-permanent value is 12.6℃.The standard value of lateral temperature difference accounts for 64.9%of the vertical direction,which provides a basis for the value of temperature in the design calculation of the curved beam bridge in the Central Plains.