桥梁结构动挠度变化规律及计算模型研究

Study on the variation rule and calculation model of dynamic deflection of bridge structure

随着科学技术的不断发展,桥梁工程成为现代交通不可或缺的一部分,但由于本身的结构复杂及受动荷载的影响大,桥梁的稳定性一直处在重要位置。因此,为研究车辆移动荷载下的桥梁挠度变化规律,本文依托于某桥梁工程案例建立有限元模型,分析桥梁结构在不同车速及不同轴重下的动挠度变化规律,并建立了动挠度随车速及轴重变化的计算参数拟合模型。研究结果表明,随着车速的不断增加,动挠度的变化速率呈现增加的趋势,随着轴重的增加,动挠度的数值呈现线性增加的趋势,计算拟合模型的动挠度结果与有限元计算结果误差在0.1 mm以内,可信度较高,表明本文建立的参数计算模型能够很好地反映动挠度随车速及轴重的变化规律。

With the continuous development of science and technology,bridge engineering has become an indispensable part of modern transportation,but due to its complex structure and great influence by dynamic load,the stability of bridges has always been in an important position.Therefore,in order to study the variation law of bridge deflection under vehicle moving load,this paper establishes a finite element model based on a bridge engineering case,analyzes the dynamic deflection change law of bridge structure at different vehicle speeds and different axle loads,and establishes a calculation parameter fitting model for dynamic deflection with vehicle speed and axle load.The results show that with the continuous increase of vehicle speed,the change rate of dynamic deflection shows an increasing trend,with the increase of axle load,the value of dynamic deflection shows a linear increase trend,and the error between the dynamic deflection result of the calculation fitting model and the finite element calculation result is within 0.1 mm,and the credibility is high,indicating that the parameter calculation model established in this paper can well reflect the change law of dynamic deflection with vehicle speed and axle load.