• Title/Summary/Keyword: PSC structure

Search Result 139, Processing Time 0.025 seconds

Concrete Structure System for the German Magnetic Letic Levitation Train (독일자기부상열차의 콘크리트 구조물 시스템)

  • 강보순
    • Proceedings of the KSR Conference
    • /
    • 2001.05a
    • /
    • pp.393-400
    • /
    • 2001
  • State of the art and current issues related with the RC and PSC structure system for the German magnetic levitation train were investigated. The German magnetic levitation train adopted a new kind of a structure to enable high-speed transportation, which allows the use of the space over a ground. The loading from Transrapid is light-weight compared with a regular train due to load distribution to a supporting structure. Therefore, Transrapid is considered an economical and efficient transportation system, and is also an environmentaly-sustainable structure, In this paper, the structural design and construction technology specific to a magnetic levitation train were discussed, and structural considerations related with an actual operation of the train were pointed out. In addition, the future research area of a magnetic levitation train was proposed.

  • PDF

A Research on how to turn Object oriented Database of civil materials to practical use (객체지향 Data Base를 이용한 토목자재 정보의 이용방안 연구)

  • Kwon, Oh-Yong;Han, Chung-Han;Kim, Do-Keun;Jo, Chan-Won
    • Proceedings of the Korean Institute Of Construction Engineering and Management
    • /
    • 2008.11a
    • /
    • pp.708-711
    • /
    • 2008
  • This study is intended to build research for ways to utilize material information in the design and working business for public works. The contents and results of this study can be classified into object-oriented DB application to bridge construction and object-oriented DB utilization of civil material information. First, application of object-oriented DB to bridge construction 1) constructs the work unit of classified work table as an object(Each object constructs material information on the statement of quantity calculation as data), 2) constructs object-oriented DB for superstructure and substructure of PSC Beam bridge, 3) leads to the research for ways to utilize materials by developing 3D bridge prototype with REVIT structure. Secondly, ways to utilize object-oriented DB for civil material information identified the possibility for utilizing it in making 2D drawings for design work, preparing materials list, analyzing structure for working businesses, selecting and purchasing materials, managing process and maintaining. It is suggested that the results of this study should be applied to all bridge constructions through test-bed and additional studies so as to secure the credibility of the results of this study.

  • PDF

Behavior of Concrete Track Girder for Magnetic Levitation Train (자기부상열차구조물에 있어서 콘크리트선로거더의 거동)

  • Kang Bo-Soon
    • Proceedings of the KSR Conference
    • /
    • 2005.05a
    • /
    • pp.686-691
    • /
    • 2005
  • State of the art and current issues related with the RC and PSC structure system for the magnetic levitation train were investigated. The German and China magnetic levitation train adopted a new kind of a structure to enable high-speed transportation, which allows the use of the space over a ground. The loading from magnetic levitation trains is light-weight compared with a regular train due to load distribution to a supporting structure. Therefore, the magnetic levitation train is considered an economical and efficient transportation system, and is also an environmentally-sustainable structure. In this paper, the structural design and construction technology specific to a magnetic levitation train were discussed, and structural considerations related with an actual operation of the train were pointed out. In addition, the future research area of a magnetic levitation train was proposed

  • PDF

Nonlinear Analysis of Prestressed Concrete Containment Structures Considering Slip Behavior of Tendons (긴장재의 슬립거동을 고려한 원자로 격납건물의 비선형 해석)

  • Kwak Hyo-Gyoung;Kim Jae-Hong;Kim Sun-Hoon;Chung Yun-Suk
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.18 no.4 s.70
    • /
    • pp.335-345
    • /
    • 2005
  • This paper concentrates on the nonlinear analysis of prestressed concrete (PSC) containment structures. Unlike a commercialized program which adopts the perfect bond assumption between concrete and tendon in the analysis of PSC structures, a numerical algorithm to consider the slip effect, simultaneously with the use of commercialized programs such as DIANA and ABAQUS, is introduced in this paper For bonded tendons, the apparent yield stress of an embedded tendon is determined from the bond slip relationship. And for unbonded tendons, Correction for the strength and stiffness of unbonded internal tendons is achieved on the basis of an iteration scheme derived from the slip behavior of tendon along the entire length. Finally, the developed algorithm is applied to two PSC containment structures of PWR and CANDU to verify its efficiency and applicability in simulating the structural behavior of large complex structures, and the obtained result shows that both containment structures represent the ultimate pressure capacity larger than about 3 times of the design pressure.

An Experimental Study on the Structure Behavior of Deck Slabs in PSC Box Girder Bridges (프리스트레스트 콘크리트 박스거더 교량 바닥판의 구조거동에 관한 실험 연구)

  • 오병환;이성철;박성용;김성태;박성룡;김병석
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2002.10a
    • /
    • pp.319-322
    • /
    • 2002
  • In this paper, an experimental study is carried out to find out structural behavior of upper slab in concrete box girder bridges. The major variables in the tests are the cross-section of upper slab including haunch dimensions. The strains of concrete and steel bars and the deflections of slabs are measured automatically during the tests. The test results indicate that the size of haunches has much influence on the structural behavior of box girders. The appropriate haunch dimensions are suggested from the present study.

  • PDF

Vehicle-bridge coupling vibration analysis based fatigue reliability prediction of prestressed concrete highway bridges

  • Zhu, Jinsong;Chen, Cheng;Han, Qinghua
    • Structural Engineering and Mechanics
    • /
    • v.49 no.2
    • /
    • pp.203-223
    • /
    • 2014
  • The extensive use of prestressed reinforced concrete (PSC) highway bridges in marine environment drastically increases the sensitivity to both fatigue-and corrosion-induced damage of their critical structural components during their service lives. Within this scenario, an integrated method that is capable of evaluating the fatigue reliability, identifying a condition-based maintenance, and predicting the remaining service life of its critical components is therefore needed. To accomplish this goal, a procedure for fatigue reliability prediction of PSC highway bridges is proposed in the present study. Vehicle-bridge coupling vibration analysis is performed for obtaining the equivalent moment ranges of critical section of bridges under typical fatigue truck models. Three-dimensional nonlinear mathematical models of fatigue trucks are simplified as an eleven-degree-of-freedom system. Road surface roughness is simulated as zero-mean stationary Gaussian random processes using the trigonometric series method. The time-dependent stress-concentration factors of reinforcing bars and prestressing tendons are accounted for more accurate stress ranges determination. The limit state functions are constructed according to the Miner's linear damage rule, the time-dependent S-N curves of prestressing tendons and the site-specific stress cycle prediction. The effectiveness of the methodology framework is demonstrated to a T-type simple supported multi-girder bridge for fatigue reliability evaluation.

Analytical study of failure damage to 270,000-kL LNG storage tank under blast loading

  • Lee, Sang Won;Choi, Seung Jai;Kim, Jang-Ho Jay
    • Computers and Concrete
    • /
    • v.17 no.2
    • /
    • pp.201-214
    • /
    • 2016
  • The outer tank of a liquefied natural gas (LNG) storage tank is a longitudinally and meridianally pre-stressed concrete (PSC) wall structure. Because of the current trend of constructing larger LNG storage tanks, the pre-stressing forces required to increase wall strength must be significantly increased. Because of the increase in tank sizes and pre-stressing forces, an extreme loading scenario such as a bomb blast or an airplane crash needs to be investigated. Therefore, in this study, the blast resistance performance of LNG storage tanks was analyzed by conducting a blast simulation to investigate the safety of larger LNG storage tanks. Test data validation for a blast simulation of reinforced concrete panels was performed using a specific FEM code, LS-DYNA, prior to a full-scale blast simulation of the outer tank of a 270,000-kL LNG storage tank. Another objective of this study was to evaluate the safety and serviceability of an LNG storage tank with respect to varying amounts of explosive charge. The results of this study can be used as basic data for the design and safety evaluation of PSC LNG storage tanks.

Comparison of Structural Analysis Models on PSC I-Girder Bridges (I형 PSC 거더교를 위한 구조해석 모델의 비교)

  • Lee Hwan-Woo;Kim Kwang-Yang;Han Sang-Jun;Ko Dong-Won
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • 2006.04a
    • /
    • pp.725-732
    • /
    • 2006
  • This study has been started for the development of a refined live load distribution formula that has safety and precision toward I type prestressed concrete girder bridge. This type of bridge is mainly applied to short span bridges that are $25{\sim}40m$ in length. Based on various structure analysis models that are currently being applied as preceding studies for the development of live load distribution method. an analysis of flexural stiffness ratio for barrier and diaphragm has been performed. As the result of parametric analysis for the changes in flexural stiffness ratio, the effect of barrier on load distribution showed as insignificant in all structural analysis models while analyzing the deflection distribution. Also. the deflection distribution of the models with stiffness of 25% in which the diaphragm eccentricity is accounted for as same as the models with stiffness of 100% in which the diaphragm eccentricity is unaccounted for. This results are verified through the comparison with a experimental data.

  • PDF

Lateral Load Distribution for Prestressed Concrete Girder Bridge (PSC 거더교의 하중횡분배에 관한 연구)

  • Park, Moon-Ho;Park, Jung- Hwal;Kim, Jin- Kyu
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.4 no.2
    • /
    • pp.157-166
    • /
    • 2001
  • The purpose of this study is to examine the accuracy of the code provisions on lateral load distribution factors of prestressed concrete girder bridges. Most designers in Korea use the lever method or lateral load distribution formula in the existing design codes. However, the methods do not account for the effect of bridge skew or direction of diaphragm. Therefore, this study analysed the prestressed concrete girder bridge with grillage model for various girder spacings, directions of diaphragms, span lengths, and skews, and compared the results with those of existing design code. It has been found that lateral load distribution factors were proportional to the girder spacing while they were not significantly affected by the change of span length, direction of diaphragm, and skew. For bending moments, lateral load distribution factors from the grillage analysis were 60%~68% of those from Korean bridge design code. Therefore, the code provisions result in very conservative design. For support reactions, however, lateral load distribution factors from the grillage analysis were slightly greater than those from Korean bridge design code. Therefore, the capacity of bearings of the bridge with a large skew should be determined by grillage analysis.

  • PDF

Surface Treatment to Inhibit Water-induced Decomposition and δ-phase Formation of Perovskite Thin Films (수분에 의한 페로브스카이트 박막의 분해 및 δ-phase 결정 형성을 억제하기 위한 표면 처리 기술)

  • Son, Kyung Nan;Naqvi, Syed Dildar Haider;Jeong, In Young;Ahn, SeJin;Chang, Hyo Sik
    • Current Photovoltaic Research
    • /
    • v.9 no.2
    • /
    • pp.23-30
    • /
    • 2021
  • Perovskite solar cells (PSCs) are currently attracting attention as a promising source of photovoltaic power generation for their rapid increase in efficiency within a short research period. However, the 2-step deposition method, which has been considered as a proper film fabrication route in commercialization point of view of PSC, requires a complicated control of environment to achieve high efficiency because each step of the process are affected by humidity in different manner. It is clearly a large hurdle for this technic to be transferred to industrialization. In this study, we developed a simple surface treatment by which high quality perovskite films can be fabricated through 2-step deposition method in a relatively wide humidity range without complicated humidity control at each step.