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Some Investigations Performed for the Bridge Over Jiu at Aninoasa

机译：对Aninoasa的Jiu大桥的一些调查

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摘要

The carrying structure of the bridge over the Jiu River at Aninoasa consists in two parallel concrete arches with variable height of the cross section, sustaining a concrete deck through vertical concrete hangers. In the time period passed since the bridge was erected, some structural elements shown damages. In order to establish the technical state of the bridge, a technical appraisement was performed and according to this, the most exposed elements to the risk of failure are the hangers. The purpose of this paper is to present briefly both, the method used to test the actual bridge carrying capacity in situ and the finite element model developed for the static and dynamic analysis of the structure. In order to estimate the state of the structural elements, two ways were followed. In the first stage, a test project was carried out and in the second stage, a complete 3D finite element model was developed to analyze the bridge structure. The test project has foreseen the loading of the bridge by heavy unloaded trucks, disposed in some positions on the deck and the measurements of the deck and arches displacements. The positions of the trucks were established in order to obtain the maximum values both for arches transverse displacements and vertical displacements of the deck. Using electro-resistive transducers the hangers elongations and strains values on their cross section were also measured. These measured values were compared with those obtained from the numerical calculations performed by using the complete finite element model. By means of the finite element model, also the response of the structure following the dynamic action of vehicles was investigated.
机译：Aninoasa上九江大桥的承载结构包括两个平行的混凝土拱门，其横截面高度可变，通过垂直的混凝土吊架支撑混凝土甲板。自桥梁竖立起的一段时间内，一些结构元件受到损坏。为了确定桥梁的技术状态，进行了技术鉴定，并据此，最容易发生故障的因素是吊架。本文的目的是简要介绍用于现场测试实际桥梁承载力的方法以及为结构的静态和动态分析而开发的有限元模型。为了估计结构元件的状态，采用了两种方法。在第一阶段，进行了一个测试项目，在第二阶段，开发了完整的3D有限元模型来分析桥梁结构。测试项目预见了重型卡车将桥梁装载在甲板上的某些位置，并测量甲板和拱门的位移。确定卡车的位置，以便获得拱形甲板的横向位移和垂直位移的最大值。使用电阻式换能器，还测量了吊架的横截面的伸长率和应变值。将这些测量值与通过使用完整的有限元模型进行的数值计算获得的测量值进行比较。借助有限元模型，还研究了结构在车辆动态作用下的响应。

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