Dynamic Analytical Modeling of Horizontal Outline Turn of T-Girder Simply Supported Bridge Ali Fadhil Naser Faculty of Building and Construction Engineering Techniques Department, Al-Mussaib Technical College, Al-Furat Al-Awsat Technical University, Iraq Corresponding author: [email protected] Received 13 June 2020, Received in revised form 21 September 2020 Accepted 10 October 2020, Available online 30 May 2021 ABSTRACT Layout line of bridge structure is a direction line which is used to define the horizontal and vertical alignment of the bridge structure. The objective of this study is to evaluate and optimize the different designs of bridge horizontal outline turn and compare the results with horizontal layout straight of bridge using dynamic analysis according to finite element analysis method. Dynamic analysis results showed that most models have converging values of dynamic natural frequency except Model No. F. and it explains that the higher rate of natural frequency is 5.10Hz within model No. F. The maximum value of loaded frequency is equal to 6.35 Hz for model No. I (Straight - curve right - straight - curve left - straight). Model No. A appears minimum value of loaded frequency which equal to 3.56Hz. The higher value of loaded frequency indicates that the bridge model has high vibration state which effects on the stiffness and flexibility of bridge structure. Model No. I appears higher value of downward acceleration which is 3.55m/s2. The maximum value of upward and downward deflection is 1.84mm and 4.07mm respectively in model No. G, indicating that this model will easy to deflect under traffic loads. It can be concluded that The bridges models No. F, H, I have values of loaded frequency higher than the values of natural frequency. Therefore, these models have lower stiffness and flexibility and bearing capacity than other. Therefore, this study recommended that the optimum design which has high stiffness and more elasticity. Keywords: Horizontal outline; T-girder; bridge; finite element; dynamic; loaded frequency Jurnal Kejuruteraan 33(2) 2021: 353-364 https://doi.org/10.17576/jkukm-2021-33(2)-19 INTRODUCTION Bridges are significant civil structures which built to span over several obstructions including water, valleys, and roads. These structures provide critical connections between different parts of transportation otherwise un- connectable. Generally, all bridges structure consist of parts as a superstructure and a substructure. The superstructure can be included all members of the bridge higher than the substructure. The essential parts of the superstructure of bridge structure include the pavement surface, the deck, and girders. The task of the superstructure is collecting the different types of loads and transfer them into the substructure of bridge structure. The substructure takes actions as a foundation of the bridge. It is consisted of the abutments, piers, piers cap, bearings, pedestals, and retaining walls. (Terranova 2015), (Jason and Arthur 2009, (Tonias 1995) A simply supported girder bridges (T and I sections) are a major number of bridges that were built in previous decades and they are two of the most popular bridge types right through the world. This type of bridges can be precast or cast in situ (prestressed or normal concrete). Historically, they became very popular after World War II due to the necessity for fast bridge construction that could fulfill the increased demand for rehabilitation of the damaged transportation networks and while durability. In the following decades simply supported concrete bridges became a common design practice worldwide. (Olga and Ioannis 2013), (Lu et al.. 2015) Layout line of bridge structure is a orientation lines which is used to define the horizontal and vertical alignment of the bridge structure and the traffic lanes. For both horizontal and vertical alignments, layout line can be straight, bent or curved. (Computers & Structures, Inc. 2009) The layout line and site of the bridge structure design depends on the vehicles types and volumes. Therefore, the bridge structure can be placed to supply the traffic movement between two sides of bridge structure. In general, different traffic situations and place state will be influenced the selection of bridge location and layout. The most important factor is layout of bridge structure with administration to topographic crossing when the position of bridge is make a decision to select (Troitsky 1994). Analysis of bridge structure can be divided into two methods (static and dynamic analysis). The choice of analysis method depends on objectives of analysis, type of bridge, and soil states. Analysis methods include engineering software models, which are using suitable material properties, boundary
Dynamic Analytical Modeling of Horizontal Outline Turn of TGirder Simply Supported Bridge
Jun 14, 2023
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