• Title/Summary/Keyword: Modular bridge

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Lightweight Design of a Modular Bridge for Railway Infrastructure Systems (철도 인프라 적용 교량형 조립식 모듈의 경량화 설계)

  • Im, Jae Moon;Shin, Kwang Bok;Park, Jae Hyun
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.25 no.6
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    • pp.471-478
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    • 2016
  • This paper describes a method to design a lightweight modular bridge for a railway infrastructure system. A lightweight design was achieved using the material selection method. Aluminum extrusions and honeycomb sandwich composites were selected as the best materials to reduce the weight of the upper structure of a conventional modular bridge made of carbon-steel material. The structural integrity of the lightweight modular bridge was evaluated under vertical and wind loads. The twisting and bending natural frequencies were also evaluated to investigate its dynamic characteristics. The results showed that the structural integrity and natural frequencies of the lightweight modular bridge, made of aluminum extrusion and sandwich composites, satisfied the design requirements. Moreover, it was found that the weight of the conventional modular bridge made of carbon steel could be reduced by a maximum of 47% using lightweight materials.

Safety Evaluation of 40m Combined Modular Bridge Super-Structures Based on Transportation Lifting Methods (40m 조합모듈교량 상부구조 이송에 따른 안전성 검토)

  • Park, Sung-Min;Jung, Woo-Young
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.6 no.2
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    • pp.77-84
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    • 2015
  • The purpose of this study was the analytical safety evaluation on the super-structure of precast modular bridge using standardized modular members and robotic construction during the transportation routing and lifting conditions. In order to evaluate the safety performance of the bridge system, 3-D full scale Finite Element (FE) of 40 m standardized modular block was developed in ABAQUS, followed by the analytical study to classify the structural system according to steel girder structures: 1) modular bridge block lifting method including the steel girder system; 2) modular bridge block lifting method without the steel girder system. The results from the analytical study revealed that the maximum stress of each modular member was within the maximum allowable stresses during lifting condition. However, the stress concentration at the connected area was more critical in comparison to the behavior of 40 m combined modular blocks during lifting time

Cyclic and static behaviors of CFT modular bridge pier with enhanced bracings

  • Kim, Dongwook;Jeon, Chiho;Shim, Changsu
    • Steel and Composite Structures
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    • v.20 no.6
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    • pp.1221-1236
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    • 2016
  • Modular structures consist of standardized modules and their connections. A modular bridge pier is proposed to accelerate bridge construction. Multiple concrete-filled steel tubes (CFTs) using commercial steel tubes were chosen as the main members. Buckling restrained bracings and enhanced connection details were designed to prevent premature low-cycle fatigue failure upon cyclic loading. The pier had a height of 7.95 m, widths of 2.5 m and 2.0 m along the strong and weak axis, respectively. Cyclic tests were performed on the modular pier to investigate structural performance. Test results showed that four CFT columns reached yielding without a premature failure of the bracing connections. The ultimate capacity of the modular pier was reasonably estimated based on the plastic-hinge-analysis concept. The modular CFT pier with enhanced bracing showed improved displacement ductility without premature failure at the welding joints.

Information Modeling of Modular Bridge Pier using BIM Based 3D-Model Library (BIM 기반 3차원 모델 라이브러리를 통한 모듈러 교각의 정보모델링)

  • Jo, Jae-Hun;Kim, Dong-Wook;Lee, Kwang-Myong;Nam, Sang-Hyeok
    • Journal of KIBIM
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    • v.3 no.4
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    • pp.11-18
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    • 2013
  • Modular technology has become a major issue of the construction industries to enhance their productivity. Modular bridge construction generally requires the collaboration between the contractor, designer, fabricator and constructor. Therefore, a readily accessible information model based on BIM technology should be provided for their communication during a construction project life-cycle. In this study, BIM based 3D information modeling was carried out for the modular bridge pier. First, the product breakdown structure (PBS) and level of detail (LOD) of the pier were defined. Based on them, 3D models were created by using parametric modeling method. In addition, database was constructed for the exchange of geometry and property data of 3D models. Finally, application areas of 3D information model were suggested, including the quantity estimation and the 4D simulation.

Development of 3D Parametric Models for Modular Bridge Substructures (모듈러 교량 하부구조를 위한 3차원 변수모델의 개발)

  • Kim, Dong-Wook;Chung, Dong-Ki;Shim, Chang-Su
    • Journal of KIBIM
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    • v.2 no.2
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    • pp.37-45
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    • 2012
  • Modular bridge construction enabling better productivity of design and construction by standardized members and robotic construction becomes an important issue in construction industry. Modular structures needs accurate information delivery between design, fabrication and construction processes. BIM (Building Information Modeling) based parametric modeling was proposed for the modular bridge substructure. Considering ranges of parameters of the modular bridge, fixed value, variables and relations were defined and these parametric models were applied to design, analysis and fabrication. Experience from development of new structures can be embedded in the 3D models, and the models provide efficient and precise knowledge delivery.

Flexural & Fatigue Evaluation of Link Slab for Continuous Girder-Type Precast Modular Bridges (거더형식 프리캐스트 모듈러교량 연속화 지점부에 적용되는 연결슬래브의 휨성능 및 피로성능 평가)

  • Joo, Bong-Chul;Song, Jae-Joon;Lee, Sang-Yoon
    • Journal of the Korea Concrete Institute
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    • v.25 no.5
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    • pp.517-528
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    • 2013
  • The modular technology has been already applied in automotive industry, plant and shipbuilding industry. Recently, the modular technology was applied in bridge construction. The modular bridge is different from the existing precast bridges in terms of standardized design that the detailed design of members is omitted by using the standard modules; the design of the modular bridge is completed by only assembling the standard modules without design in member level. The girder-type precast modular bridge has been developed as a simply supported bridge. The girder-type precast modular bridge could be applied to the multi-span bridges through the continuity method. The continuity of the girder-type precast modular bridge is achieved by using the link slab which is easy to construction and appropriate to the rapid construction. The link slabs have been used as the type of reinforced concrete structure in US from the 1950's. In 2000's, the link slab using the engineered cementitious concrete (ECC link slab) has been developed. In this study, the RC type link slab which is more reproducible and economic relative to the ECC link slab was used for the continuity of the girder-type precast modular bridges, and the construction detail of RC type link slab was modified. In addition, the modified iterative design method of RC type link slab was proposed in this study. To verify the proposed design method, the flexural tests were conducted using the RC type link slab specimens. Also, the fatigue test using the mock-up specimen was conducted with cyclic loading condition up to two million cycles.

An Experimental Study on the Behaviour of Modular GFRP Deck for Use in Deteriorated Bridge Decks Replacement (노후교량 바닥판 대체용 Modular GFRP 바닥판 거동에 관한 실험 연구)

  • Ji, Hyo-Seon;Chunk, Kyung-Sik
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.1 no.2
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    • pp.44-50
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    • 2010
  • The behaviour of Modular GFRP(Glass Fiber Reinforced Polymers) decks for use in deteriorated bridge decks replacement are investigated experimentally in this study. As for the performance evaluation of bridge decks, experimental studies on the 3 test specimens with 1/5 scale of full size were carried out. Three specimens were sandwich plates with box tube cores. The constituents of bridge decks were glass fiber preforms and epoxy resin. The experimental results of all the specimens were summarized for maximum strength, stiffness and deformation capacity. A finite element analyses were compared to verify validity of experimental results.

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Analytical evaluation of a modular CFT bridge pier according to directivity

  • Kim, Dongwook;Jeon, Chiho;Shim, Changsu
    • Steel and Composite Structures
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    • v.20 no.6
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    • pp.1193-1203
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    • 2016
  • This paper focuses on the analytical behavior of modular circular concrete-filled tubular (CFT) column with enhanced bracing details. To design a full-scale bridge pier of multiple circular concrete-filled tubes, numerical analysis was used to evaluate structural performance according to load directivity. In previous research (Ma et al. 2012, Shim et al. 2014), low cycle fatigue failure at bracing joints was observed, so enhanced bracing details to prevent premature failure are proposed in this analysis. The main purpose of this research is to investigate seismic performance for the diagonal direction load without premature failure at the joints when the structure reaches the ultimate load. The ABAQUS finite-element software is used to evaluate experimental performance. A quasi-static loading condition on a modular bridge pier is introduced to investigate structural performance. The results obtained from the analysis are evaluated by comparing with load-displacement responses from experiments. The concrete-filled tubes with enhanced bracing details showed higher energy dissipation capacity and proper performance without connection failure for a diagonal load.

IFC-based Representation Method of Part Information in Superstructure Module of Modular Steel Bridge with Assembly System (모듈러 강교량 상부모듈의 조립체계 정의를 통한 IFC 기반의 부품정보 표현방법)

  • An, Hyun Jung;Lee, Sang-Ho
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.25 no.4
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    • pp.307-314
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    • 2012
  • IFC-based representation method of part library for superstructure module of modular steel bridge is proposed. The library is capable of efficiently offering and exchanging part information in process of manufacture, assembly, design, and construction of modular steel bridge. Entities, representing physical part information in IFC model, are matched semantically with parts of the superstructure module for representation of part information with IFC model. Either types of matched entities are applied in order to verify the role of each part, or new types are defined as a user-defined types. In addition, assembly system has been classified and defined into 4 levels of LoD(Level of Detail) to provide appropriate part information efficiently from the part library in each step of the process. Then, new property is defined for representing the LoD information with IFC Model. Finally, IFC-based test library of modular steel bridge is generated by applying the matched entities and entity types to the actual the superstructure module of modular steel bridge.

A Study on the Static Behavior of GFRP Bridge Deck (GFRP 교량 바닥판의 정적거동에 관한 연구)

  • Ji, Hyo Seon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.3
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    • pp.163-170
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    • 2011
  • A concept of Modular GFRP(Glass Fiber Reinforced Polymer) deck panel was proposed for bridge decks. The modular GFRP bridge deck system is comprised of main unit module and connector unit module with GFRP flanges and web. Its structural performance under static loading was evaluated and compared with the LUSAS finite element predictions. It was found that the presented GFRP modular panel was very efficient for use in bridges. The failure mode of the proposed GFRP deck was similar when compared with that of commercial other GFRP decks developed.