• Title/Summary/Keyword: two-plate-girder bridge

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Capacity evaluation of PC-slab composite actions for the railway steel plate girder according to an experimental construction (PC-Slab 합성 철도판형교 유도상화 시험부설에 따른 성능 비교평가)

  • Min, Kyung-Ju;Lee, Sung-Uk;Choi, Hyung-Soo;Woo, Yong-Keun
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.697-706
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    • 2011
  • There are more than 800 railway steel plate girder bridges which are in use and the total length is approximately 50 km. Among these, it shall be pointed out that non-ballast rail systems which lay on wood sleepers are the most critical members. To strengthen this type of structures, mainly two methods have been applied. The first one is the most typical method which is to replace the girders with slab girder system or steel composite girders and to add ballast. It is not uncommon that the construction cost of substructure is more than ten time higher than that of superstructures and even in this case, the structural uncertainty for the substructures is not diminished. To resolve above mentioned problems, new method was developed to rehabilitate railway steel girder bridge by adding PC-slab using transport equipment. Using this method, substructure strengthen is rarely required because the additional weight to the bridge superstructure is only up to 1.0t/m. Also it was possible to save the construction cost by reducing construction duration and by simplifying the construction process. Experimental construction was performed for Jewon bridge and measurements were performed before and after construction to verify the bridge capacity.

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FE Model Updating on the Grillage Model for Plate Girder Bridge Using the Hybrid Genetic Algorithm and the Multi-objective Function (하이브리드 유전자 알고리즘과 다중목적함수를 적용한 플레이트 거더교의 격자모델에 대한 유한요소 모델개선)

  • Jung, Dae-Sung;Kim, Chul-Young
    • Journal of the Earthquake Engineering Society of Korea
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    • v.12 no.6
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    • pp.13-23
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    • 2008
  • In this study, a finite element (FE) model updating method based on the hybrid genetic algorithm (HGA) is proposed to improve the grillage FE model for plate girder bridges. HGA consists of a genetic algorithm (GA) and direct search method (DS) based on a modification of Nelder & Mead's simplex optimization method (NMS). Fitness functions based on natural frequencies, mode shapes, and static deflections making use of the measurements and analytical results are also presented to apply in the proposed method. In addition, a multi-objective function has been formulated as a linear combination of fitness functions in order to simultaneously improve both stiffness and mass. The applicability of the proposed method to girder bridge structures has been verified through a numerical example on a two-span continuous grillage FE model, as well as through an experimental test on a simply supported plate girder skew bridge. In addition, the effect of measuring error is considered as random noise, and its effect is investigated by numerical simulation. Through numerical and experimental verification, it has been proven that the proposed method is feasible and effective for FE model updating on plate girder bridges.

Redundancy Evaluation of the Composite Two Steel Plate-Girder Bridges (강합성 플레이트 2-거더교의 여유도 평가)

  • Park, Yong-Myung;Joe, Woom-Do-Ji
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.4A
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    • pp.611-620
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    • 2006
  • The composite two plate-girder bridges are generally defined as a non-redundant load path structure because the bridge can collapse if one of the two girders is seriously damaged by a fatigue crack. In this paper, a numerical study on the evaluation of the after-fracture redundancy of the composite two-girder bridges was accomplished. The evaluation has been performed on the simple and three-span continuous bridges with I-section cross beams which serve as transverse bracing, and with or without the bottom lateral bracing system. The load carrying capacities of the intact and damaged bridges with or without lateral bracing were evaluated from material and geometric nonlinear analysis, respectively and the redundancy was evaluated for each case. It was acknowledged from the analytical results that both simple and continuous intact two-girder bridges have sufficient redundancy even without lateral bracing, but it takes an important role to improve the redundancy of damaged bridges.

An Experiment on Redundancy in Simple Span Two-Girder Bridge - Effects of Lateral Bracing (단경간 2-거더교의 여유도 평가 실험-수평브레이싱의 효과)

  • Park, Yong Myung;Joe, Woon Do Ji;Hwang, Min Oh;Lee, Dae Yong;Yoon, Tae Yang
    • Journal of Korean Society of Steel Construction
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    • v.19 no.3
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    • pp.271-280
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    • 2007
  • This paper presents the results of an experimental study to evaluate the redundancy in two plate-girder bridges, which are generally classified as non-redundant load path structures. The study was performed at a time when one of the two girders was damaged. The bottom lateral bracing was considered the experimental variable, and two 1/5-scale bridge specimens of simple span with and without a lateral bracing system were fabricated. Loading tests were first performed on the intact specimens without a cracked girder, within an elastic range. Thereafter, the ultimate loading tests were conducted on the damaged specimens with an induced crack at the center of a girder. The test results showed that the cross beams and the concrete deck redistributed some of the load to the uncracked girder, but the lateral bracing system played an important role in improving the redundancy during the damage and was also effective for load redistribution even when the bridge was intact.

A study on the Steel Plate Girder Railway bridge in the applying External Post-tensioning Method (강철도교에 대한 외부 후긴장 보강공법의 적용에 관한 연구)

  • Choi Jung-Youl;Park Yong-Gul;Byun Jong Gul
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.1034-1039
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    • 2004
  • The major objective of this study is to investigate the effects and application of reinforcement for steel plate girder railway bridge by the external prestressing method. It analyzed the mechanical behaviors of non-ballasted railway bridge with ballast reinforced and external post-tensioning reinforced on the finite clement analysis for the static and dynamic behavior. As a result, the reinforcement of ballasted railway bridge the external prestressing method are obviously effective for the additional dead force which is ballast. The analytical study are carried out to investigate the post-tension force decrease bending behavior and deflection in composite bridge for serviceability. To develop two type FEM model which reflect well the post-tension force transverse distribution behavior of servicing bridge. With the comparing the results of railway bridge with ballast which carried out before the post-tensioning with the results of railway bridge with ballast which carried out after post-tensioning, It is investigated that the additional dead load decrease effect and bending behavior of servicing bridge is effect by the post-tensioning. The reinforcement by using the external tendon can be reducing that structure of a degradation phenomenon by unusual stresses due to additional dead load and other problems.

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A Study on the Disposition of Cross Beams in Composite Plate Girder Bridge (강합성 플레이트거더교의 가로보 배치에 관한 연구)

  • Park, Yong Myung;Baek, Seung Yong;Hwang, Min Oh
    • Journal of Korean Society of Steel Construction
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    • v.14 no.6
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    • pp.691-699
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    • 2002
  • A study on the evaluationof the proper spacing and required bending rigidity of cross beams in composite multiple I-girder bridge without lateral and sway bracing system was performed. For the purpose, a two-lane 40m simple span and 40+50+40m continuous sample bridge with four girders was designed. For the sample bridges, structural analysis under the design loads including dead load before and after composite, live load, and seismic loads has been performed. The material and geometric nonlinear analysis under dead load before composite has also been performed to evaluate lateral buckling strength of the steel-girder-cross beam grillage. Based on the two phase anlayses, proper spacing and bending righidity of cross beams were proposed.

Reinforcement Location of Plate Girders with Two Longitudinal Stiffeners (플레이트 거더의 2단 수평보강재 보강 위치)

  • Son, Byung-Jik;Lee, Kyu-Hwan
    • Journal of the Korean Society of Safety
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    • v.24 no.6
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    • pp.93-102
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    • 2009
  • Because steel girder bridge has big slenderness ratio, buckling is very important in design. Local buckling of plate girders having two longitudinal stiffeners in different positions under various load conditions is investigated. Various parametric study according to the change of web height, transverse stiffeners and load conditions are examined. These parametric studies are performed by numerical simulation utilizing finite element method. The objective of this study is to present the rational reinforcement location of two longitudinal stiffeners. The results of analysis are compared to that recommended by korean specifications for road bridges(2003).

Numerical study of steel box girder bridge diaphragms

  • Maleki, Shervin;Mohammadinia, Pantea;Dolati, Abouzar
    • Earthquakes and Structures
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    • v.11 no.4
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    • pp.681-699
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    • 2016
  • Steel box girders have two webs and two flanges on top that are usually connected with shear connectors to the concrete deck and are also known as tub girders. The end diaphragms of such bridges comprise of a stiffened steel plate welded to the inside of the girder at each end. The diaphragms play a major role in transferring vertical and lateral loads to the bearings and substructure. A review of literature shows that the cyclic behavior of diaphragms under earthquake loading has not been studied previously. This paper uses a nonlinear finite element model to study the behavior of the end diaphragms under gravity and seismic loads. Different bearing device and stiffener configurations have been considered. Affected areas of the diaphragm are distinguished.

Establishment of Maintance Methods for Express railway Bridges using High Rail Monitoring Systems (상시 계측결과를 이용한 고속철도 교량의 유지관리 기준치 설정)

  • Seo, Hyeong-Lyel;Han, Sang-Chul;Ji, Ki-Hwan
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.322-327
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    • 2006
  • Banwol bridge with steel plate girder and Pyongtaek bridge with PSC bos girder have been operated maintenance measuring system by the Seoul-Chonan of Kyongbu express railway. By analyzing the theoretical and experimental values of design load for these two bridge, the establishment of reference maintenance for measuring items was deduced from research. Two materials, steel and concrete plates, were considered as the upper structure. Actual measurement data for the behavior under speed, structural analysis results, and the presented references were analyzed and used to set up the reference establishment. The measuring items are stress(strain), displacement, dynamic acceleration, expansion movement, and dynamic frequency. The maintenance reference was established by comparing analytical and measuring values of the five items with respect to structural state class.

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Dynamic Analysis for Two plate Girder Railway Bridge Considering Real High Speed Train Loads (실 고속열차하중을 고려한 소수주형 철도교량의 동적해석)

  • Kang, Young-Jong;Kim, Jung-Hun;Shin, Ju-Hwan;Lee, Myeong-Sup
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.960-964
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    • 2011
  • High speed railway structure, contact of vehicle needs to design considering the running stability(dynamic behavior). Also, upper structure has to satisfy design standard about moving load, high speed train(KTX). So, the high speed railway structure has to satisfy the requirement of natural frequency, vertical acceleration on deck, face distortion and vertical displacement considering ride comfort, which is suggested Ho-nam high speed railway design standard. In this study, it was investigated and evaluated to the dynamic behavior for tow plate Girder railway bridge subjected to moving load considering real high speed train loads.

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