利用振动法测量预应力体外索的索力
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摘要
为了能够利用振动法测量316国道洪塘大桥预应力体外索的索力,本文根据理想弦的振动方程以及梁的横向振动方程,建立起有灌浆预应力体外索索力的计算模型,该计算模型中含有两个权重系数λ1、λ2。利用该桥体外预应力索的模型实验数据,通过最小二乘法拟合出系数λ1、λ2并得到体外索索力的计算公式。误差分析表明该体外索索力计算公式误差小,可以用于洪塘大桥体外索索力计算以及该桥体外索长期健康监测。
In order to use the vibration method to measure the cable tension of the external prestressed cable of Hongtan Bridge on 316 national road,according to the simple taut string theory and the transverse vibration theory of beam,this paper establishes the calculation model of cable tension of the grouting external prestressed cable.This calculation model has two indeterminate coefficients λ1andλ2.Using the model testing data of Hongtan Bridge external prestressed cable,by the least square technique,the coefficientλ1andλ2 are found out.Error analysis indicates that the error of the formula to estimate cable tension of the grouting external prestressed is small.And this formula can be used to calculate the cable tension of Hongtan Bridge and its long-term health monitoring.
In order to use the vibration method to measure the cable tension of the external prestressed cable of Hongtan Bridge on 316 national road,according to the simple taut string theory and the transverse vibration theory of beam,this paper establishes the calculation model of cable tension of the grouting external prestressed cable.This calculation model has two indeterminate coefficients λ1andλ2.Using the model testing data of Hongtan Bridge external prestressed cable,by the least square technique,the coefficientλ1andλ2 are found out.Error analysis indicates that the error of the formula to estimate cable tension of the grouting external prestressed is small.And this formula can be used to calculate the cable tension of Hongtan Bridge and its long-term health monitoring.
引文
[1]彭贻希.洪塘大桥三角桁架下承式T型刚构荷载试验分析与评价[J].上海公路,2001(3):20-24.
[2]陈刚,任伟新.基于环境振动的斜拉桥拉索基频识别[J].地震工程与工程振动,2003,23(3):100-106.
[3]郝超,裴岷山,强士中.斜拉桥索力测试新方法—磁通量法[J].公路,2000(11):31-32.
[4]张宏跃,田石柱.提高斜拉索索力估算精度的方法[J].地震工程与工程振动,2004,24(4):148-151.
[5]郑振,黄铖.国道316线洪塘大桥结构检测与状态评估[J].福州大学学报,2003(2):191-195.
[6]高淑英,沈火明.线性振动教程[M].北京:中国铁道出版社,2003:102-142.
[7]Ren Wei-Xin,Chen Gang,Hu Wei-Hua.Empirical formulas to estimate cable tension by cable fundamental frequensy[J].Structural Engi-neering and Mechanics,2005,20(3):363-380.
[2]陈刚,任伟新.基于环境振动的斜拉桥拉索基频识别[J].地震工程与工程振动,2003,23(3):100-106.
[3]郝超,裴岷山,强士中.斜拉桥索力测试新方法—磁通量法[J].公路,2000(11):31-32.
[4]张宏跃,田石柱.提高斜拉索索力估算精度的方法[J].地震工程与工程振动,2004,24(4):148-151.
[5]郑振,黄铖.国道316线洪塘大桥结构检测与状态评估[J].福州大学学报,2003(2):191-195.
[6]高淑英,沈火明.线性振动教程[M].北京:中国铁道出版社,2003:102-142.
[7]Ren Wei-Xin,Chen Gang,Hu Wei-Hua.Empirical formulas to estimate cable tension by cable fundamental frequensy[J].Structural Engi-neering and Mechanics,2005,20(3):363-380.
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