• Title/Summary/Keyword: pier strength.

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A Case Study on the Assessment of Damaged Cause for the Damaged Reinforced Concrete Pier

  • Chai, Won-Kyu;Kim, Kwang-Il;Son, Young-Hyun
    • International Journal of Safety
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    • v.10 no.1
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    • pp.16-21
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    • 2011
  • In this thesis, appearance inspection, compressive strength of concrete test, arrangement of bar inspection, survey, and bearing stress analysis were performed on a damaged coping of reinforced concrete pier to investigate the damage cause. According to the performed a series of inspections, it was found that the coping of pier was damaged during PSC (Pre-stressed Concrete) beam construction. In this thesis, the repair method for damaged pier was studied. The repair procedure used in this thesis was follows : chipping for damaged part, clean by high-pressure, installation of wire mesh, coating of surface hardening, construction of section restoration material, copula grinding, and prevent coating for far-infrared radiation.

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Cellular and corrugated cross-sectioned thin-walled steel bridge-piers/columns

  • Ucak, Alper;Tsopelas, Panos
    • Structural Engineering and Mechanics
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    • v.24 no.3
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    • pp.355-374
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    • 2006
  • Thin walled steel bridge-piers/columns are vulnerable to damage, when subjected to earthquake excitations. Local buckling, global buckling or interaction between local and global buckling usually is the cause of this damage, which results in significant strength reduction of the member. In this study new innovative design concepts, "thin-walled corrugated steel columns" and "thin-walled cellular steel columns" are presented, which allow the column to undergo large plastic deformations without significant strength reduction; hence dissipate energy under cyclic loading. It is shown that, compared with the conventional designs, circular and stiffened box sections, these new innovative concepts might results in cost-effective designs, with improved buckling and ductility properties. Using a finite element model, that takes the non-linear material properties into consideration, it is shown that the corrugations will act like longitudinal stiffeners that are supporting each other, thus improving the buckling behavior and allowing for reduction of the overall wall thickness of the column.

Structrral Analysis of Bridge Pier with 40MPa High Strength Concrete (설계강도 40MPa 고강도 콘크리트를 적용한 교량 교각 구조물의 구조해석)

  • Hur, Jae-Hun;Yi, Sang-Keun;Gwak, Seok-Hwan;Huh, Suk-Bum;Park, Chang-Min
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.157-158
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    • 2009
  • In this study, We analyze structural behavior feature of column under reinforced-bar and concrete strength and load conditions and analyze optimal column diameter and construction cost through parameter study. In case we use the 40MPa high strength concrete instead of 27MPa concrete in pier, the results show positive effect in appearance of pier and cost because of small column diameter and low construction cost. Also, practical effect is proved by applying this results in pier of Shin Hou Bridge on Hum-Sung ${\sim}$ Chung-Ju highway construction work.

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Seismic Performance of Concrete-Filled Steel Piers Part I : Quasi-Static Cyclic Loading Test (강합성교각의 내진성능평가 Part I : 준정적 반복재하실험)

  • 조창빈;서진환;장승필
    • Journal of the Earthquake Engineering Society of Korea
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    • v.6 no.2
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    • pp.9-19
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    • 2002
  • Steel piers and concrete-filled steel(CFS) piers, in spite of reasonable strength, high ductility, small section, and fast construction, have not been considered as one of alternatives to RC piers even in the highly populated urban area where aseismic safety, limited space and fast construction are indispensably required. This paper, the first of two companion papers for the seismic performance of steel and CFS piers, tests steel and CFS piers under quasi-static cyclic loading to estimate their ductility and strength. Additional details such as rebars and base ribs are added to increase the ductility of a concrete-filled steel pier with minimum additional cost. Also, simplified numerical analyses using nonlinear spring and shell elements are examined for the estimation of the ductility and strength of concrete-filled steel piers and a steel pier. The result shows that concrete-filled steel peirs have higher energy absorption, i.e., ductility and strength than those of steel pier and increasing bonding between in-filled concrete and lower diaphragm, and the improved details of stress concentrated region would be important for the ductility and strength of a pier. Numerical results show that simplified modeling with nonlinear springs and shells has potential to be effective modeling technique to estimate the seismic performance of a concrete-filled steel pier.

Seismic behavior of thin-walled CFST pier-to-base connections with tube confined RC encasement

  • Xuanding Wang;Yue Liao;Jiepeng Liu;Ligui Yang;Xuhong Zhou
    • Steel and Composite Structures
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    • v.50 no.2
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    • pp.217-235
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    • 2024
  • Concrete-filled steel tubes (CFSTs) nowadays are widely used as the main parts of momentous structures, and its connection has gained increasing attention as the complexity in configuration and load transfer mechanism. This paper proposes a novel CFST pier-to-footing incorporating tube-confined RC encasement. Such an innovative approach offers several benefits, including expedited on-site assembly, effective confinement, and collision resistance and corrosion resistance. The seismic behavior of such CFST pier-to-footing connection was studied by testing eight specimens under quasi-static cyclic lateral load. In the experimental research, the influences on the seismic behavior and the order of plastic hinge formation were discussed in detail by changing the footing height, axial compression ratio, number and length of anchored bars, and type of confining tube. All the specimens showed sufficient ductility and energy dissipation, without significant strength degradation. There is no obvious failure in the confined footing, while local buckling can be found in the critical section of the pier. It suggests that the footing provides satisfactory strength protection for the connection.

Design Strength of Bridge Piers against Ship Collision (교각의 선박충돌 설계강도)

  • Lee Seong-Lo;Bae Yong-Gwi
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.659-662
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    • 2004
  • An analysis of the AF is performed for each bridge pier exposed to ship collision. From this analysis, the impact lateral resistance can be determined for each pier. The bridge pier impact resistance is selected using a probability-based analysis procedure in which the predicted AF, from the ship collision risk assessment is compared to an acceptance criterion. In this study, the acceptance criterion is allocated to each pier using allocation weights based on the previous predictions. To determine the design impact lateral resistance of bridge components such pylon and pier, the numerical analysis is performed iteratively with the analysis variable of impact resistance ratio of pylon to pier. The design impact lateral resistance can vary greatly among the components of the same bridge, depending upon the waterway geometry, available water depth, bridge geometry, and vessel traffic characteristics.

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Evaluation of Flexural Behavior of a Modular Pier with Circular CFT (충전원형강관을 이용한 모듈러 교각의 휨 거동 평가)

  • Ma, Hyang Wook;Oh, Hyun Chul;Kim, Dong Wook;Kong, Davon;Shim, Chang Su
    • Journal of Korean Society of Steel Construction
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    • v.24 no.6
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    • pp.725-734
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    • 2012
  • A new modular pier system using concrete filled circular steel tubes was suggested to realize modular bridge substructures for accelerated bridge construction. Structural details and connection details were proposed by connection multiple concrete filled tubes (CFT) for standardized products of fabrication, delivery and erection. Static tests were performed for the modular pier with suggested details under lateral load conditions for weak and strong axes. Due to the eccentricity by the bracing system, the modular pier showed 5.23 times higher flexural stiffness and 6 times greater flexural strength from the test. It is proper for the rational design to evaluate stress and deformation by frame modeling of the modular CFT pier. Structural capacity of the pier can be obtained by adjusting the spacing of the CFT columns. Design recommendations were derived from the test.

A Study on Design Optimization of Mooring Pier using Prestressed Precast Concrete Panel (프리스트레스트 프리캐스트 콘크리트 패널을 이용한 잔교식부두의 최적설계)

  • 조병완;태기호;김용철
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10a
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    • pp.253-258
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    • 2000
  • Recently, the area of design optimization, especially structural optimization, has been and to be a continuous active area of research. And the design optimizations of port facilities have been achieved by many other civil engineers. But the design optimization of port facilities were limited to the design optimization of the breasting dolphin. This paper invested the design optimization of mooring pier and the foundations of mooring pier was suggested considering the convenience of repair and reinforcement work. The mooring pier devised with prestressed precast concrete panel and rigid frame welded wide flange beam to steel pipe pile. To accomplish the design optimization of mooring pier, the Augmented Lagrangian Multiplier Method(ALM) of ADS(Garret N. Vanderplaats) optimization routine, BFGS method as optimizer and Golden Section Method as one dimensional search were utilized. As a result, thirty percent of material cost for construction was reduced by design optimization. The tensile stress of concrete panel and bottom flage was critical constraints under service load. So, using high strength concrete and steel will be economical. And lots of initial values must be invested to accomplish the design optimization in design procedures.

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A Parametric Study on Seismic Performance of Internally Confined Hollow RC Columns (내부 구속 중공 RC 기둥의 내진성능에 관한 매개 변수 연구)

  • Won, Deok-Hee;Han, Taek-Hee;Kim, Jung-Hun;Choi, Jun-Ho;Kang, Young-Jong
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.3 no.2
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    • pp.28-35
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    • 2012
  • Recently, there is to increase interest in seismic performance of piers. Hollow section is applied to increasing the seismic performance of piers. However, hollow RC pier becomes the biaixial confining state because hollow part is not confined. The pier is developed brittle failure from inner face in hollow part. A tube is inserted in hollow part to become the weakness. This is ICH RC(Internally Confined Hollow RC) pier. This pier is enhanced stiffness, strength, and ductility by core concrete has triaxial confining stress. In this paper is researched about parameters effect the seismic performance. Parameters are hollow ratio, transverse reinforcement, longitudinal reinforcement, and concrete strength.

Seismic-performance Experiments of Circular Shear Piers Considering Effects of Rebar Corrosion, Lap splice and Axial Load (철근부식, 겹침이음 및 축하중의 영향을 고려한 원형 전단 교각의 내진성능실험)

  • Lee, Soo-Hyung;Lee, Seung-Geon;Lee, Hyerin;Hong, Kee-Jeung
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.25 no.6
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    • pp.143-153
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    • 2021
  • The corroded pier that has corrosion of the tranverse steel, main steel and lapsplice directly affects the seismic performance. The corrosion of the tranvese and main steel directly reduce the shear strength and bendig strength. If steel corrosion occurs in lap splice, the flexural strength and flexibility of existing corroded pier that are not seismic design are significantly reduced. In addition, as the axial force acting on the pier increase the shear strength. Considering these effects. In this stuydy, we cosidered steel corrosion, lap splice and axial force, for a reasonable evaluation of seismic-performance. It is confirmed that flexular failure occurs at pies where shear failure is expected to occur due to corrosion of reinforcement. These failure modes and their reason are analyzed, and necessary considerations are presented for seismic reinforcement.