双薄壁墩连续刚构桥基频的统一计算模式

发布时间：2018-06-21 13:52

本文选题：桥梁工程 + 高墩连续刚构　；参考：《应用力学学报》2016年06期

【摘要】：为研究双薄壁墩连续刚构桥基频计算公式并建立其统一表达式,基于能量原理在给出振型函数的基础上提出了高墩连续刚构桥基频的一般表达式;以典型高墩连续刚构桥梁为例,通过改变系梁的数量、位置、刚度,构造了多种不同的桥梁结构形式,建立了相应的有限元分析模型,研究了系梁设计参数对桥梁结构自振特性影响的一般规律,分析了具有系梁构造的高墩大跨连续刚构桥基频理论计算公式,并对高墩连续刚构桥基频的一般表达式进行了修正,给出了基频的统一计算模式,最后对该模式的可行性进行了实桥验证。结果表明:设置系梁后,连续刚构桥的基频至少增大了15%;随着系梁与桥墩刚度比值的增大,高墩连续刚构桥基频明显增大,两者呈一定的函数关系;本文提出的基频统一公式计算值与桥梁基频实测值误差为3%。研究成果可为此类桥梁抗震设计及结构评估提供参考。
[Abstract]:In order to study the calculation formula of foundation frequency of continuous rigid frame bridge with double thin-walled piers and establish its unified expression, a general expression of foundation frequency of continuous rigid frame bridge with high pier is proposed based on the energy principle and the mode function. Taking a typical continuous rigid frame bridge with high piers as an example, by changing the number, position and stiffness of the girders, various structural forms of the bridge are constructed, and the corresponding finite element analysis model is established. This paper studies the general law of the influence of the design parameters of the tie beam on the natural vibration characteristics of the bridge structure, analyzes the theoretical calculation formula of the foundation frequency of the continuous rigid frame bridge with high piers and long span, and modifies the general expression of the foundation frequency of the continuous rigid frame bridge with high pier. The unified calculation model of fundamental frequency is given, and the feasibility of the model is verified by real bridge. The results show that the fundamental frequency of continuous rigid frame bridge increases at least 15 with the increase of stiffness ratio of tie beam to pier, and the fundamental frequency of continuous rigid frame bridge with high pier increases obviously with the increase of stiffness ratio of tie beam to pier, and the fundamental frequency of continuous rigid frame bridge with high pier has a certain function relationship. The error between the calculated value of the basic frequency formula and the measured value of the bridge is 3. The research results can provide reference for seismic design and structural evaluation of this kind of bridges.
【作者单位】：长安大学公路学院;山东交通职业学院;中交公路规划设计院有限公司;
【基金】：国家自然科学基金(51008028) 陕西省交通科技项目(14-26T) 陕西省自然科学基金(2016JM5030) 山西省交通建设科技项目(14-2-08;15-2-01)
【分类号】：U448.23

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