[논문]스마트 반강접 (PR) 콘크리트 충전 강재 합성 (CFT) 접합 구조물에 대한 해석모델의 개발

선우현; 허종완

doi:10.11004/kosacs.2011.2.4.001

초록
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본 연구는 각 연결부에 대한 수치 해석을 통하여 강재-콘크리트 합성 프레임 구조물의 성능을 조사하였다. 본 연구의 혁신적인 측면은 강재 보와 CFT 기둥의 연결부 사용과 저탄소강과 형상 기억 합금 구성요소의 조합을 활용하는데 있다. 이러한 새로운 연결부의 목적은 지진 후 건물의 손상과 잔류 흐름을 줄이기 위해 고탄성 형상기억합금 인장부에서 발생하는 교정 작용과 저탄소강의 우수한 에너지 분산 능력을 활용하는 것이다. 연결부의 핀, 전체적인 고정 또는 부분 구속으로 모델링을 할 수 없기 때문에 이러한 구조물들의 해석과 설계는 복잡하여 PR-CFT 연결부의 전체적인 거동을 알기 위한 수치해석을 위해 정교한 3차원 솔리드 요소로 구성된 유한해석 모델을 개발하였다. 이러한 유한요소 해석으로 얻은 결과를 바탕으로 스프링 요소를 이용하여 간단한 연결부 모델링을 공식화 시켰다. 반복 하중을 가하여 전체 프레임 구조물의 거동을 확인하였고 3D 유한요소 해석을 통하여 단순 거동을 비교하였다.

Abstract ▼ AI-Helper

This study investigates the performance of composite (steel-concrete) frame structures through numerical experiments on individual connections. The innovative aspects of this research are in the use of connections between steel beams and concrete-filled tube (CFT)columns that utilize a combination o...

This study investigates the performance of composite (steel-concrete) frame structures through numerical experiments on individual connections. The innovative aspects of this research are in the use of connections between steel beams and concrete-filled tube (CFT)columns that utilize a combination of low-carbon steel and shape memory alloy (SMA) components. In these new connections, the intent is to utilize the recentering provided by super-elastic shape memory alloy tension bars to reduce building damage and residual drift after a major earthquake. The low-carbon steel components provide excellent energy dissipation. The analysis and design of these structures is complicated because the connections cannot be modeled as being simply pins or full fixity ones they are partial restraint (PR). A refined finite element (FE) model with sophisticated three dimensional (3D) solid elements was developed to conduct numerical experiments on PR-CFT joints to obtain the global behavior of the connection. Based on behavioral information obtained from these FE tests, simplified connection models were formulated by using joint elements with spring components. The behavior of entire frames under cyclic loads was conducted and compared with the monotonic behavior obtained from the 3D FE simulations. Good agreement was found between the simple and sophisticated models, verifying the robustness of the approach.

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문제 정의

A 2D joint model is appropriate for use in frame analyses to estimate the inelastic response of moment frames under cyclic loading such as that imposed by large earthquakes. The primary objective of this study is the development and implementation in simplified joint models reflecting the real connection behavior.

가설 설정

This research intends to explore a mixture of steel bars and super-elastic Nitinol bars as connecting elements to CFT columns. It is hypothesized that such combinations of CFT columns and SMA connections will achieve excellent ductility, high strength, and recentering capability. The structural combinations and advantages for this "smart PR-CFT" connection, as well as the whole approach for this research, are summarized schematically in Figure 3.

제안 방법

This will avoid the potential for entire system collapse and improve the probability of survival (Astaneh-Asl 1995). All designs were carried out based on demand capacity principles, evaluated using the typical assumptions of weak beam and strong column conditions.
In this study, the shear deformations are ignored because the concrete inside the tubular columns considerable reduces the contribution of shear deformations to the overall joint displacements. In addition, because the behavior of both beams and columns as isolated members is well-understood, this study focuses on connection behavior only. For stiffness, connections are classified as fully restrained (FR), partially restrained (PR) or simple pinned connections.
In this research, most of FE work, including the generation of parametric geometries and meshes, was done by using ABAQUS/CAE with an input file-based edition to add more modeling flexibility. The FE models (i.
The numerical models consisted of refined 3D solid elements (8 node brick element, C3D8) incorporating the full nonlinear material/ geometric properties, contact elements, surface interaction with friction, constraint conditions using equation points, concrete crack conditions, and elastic foundation modeling.
The smart PR-CFT connection developed in this study is an innovative structural element that takes advantage of the synergestic characteristics of the composite system, flexible PR connections, and use of new materials. The simplified component and joint model for the smart PR-CFT connection developed as part of this investigation provided good results.

대상 데이터

A572 Grade 50 steel was used for all members and joint components. A490 high strength bolt material was used for steel bars, washers, and nuts. Super-elastic (SE) Nitinol bars, with the characteristics shown in Figure 2, were located where the largest deformations were likely to occur.
The connections were fabricated with an assembly of various steel members cut from standard shapes available in the current design specification (AISC 2001). A572 Grade 50 steel was used for all members and joint components. A490 high strength bolt material was used for steel bars, washers, and nuts.

이론/모형

All connections in this study were designed as full strength (FS), meaning that they can transfer the full plastic beam moment (M_p) calculated according to the LRFD Standard (AISC 2001).The connection design, however, did not aim to achieve full restraint (FR or full end rigidity); it intended to utilize PR behavior to obtain ductile connection behavior.

후속연구

This research intends to explore a mixture of steel bars and super-elastic Nitinol bars as connecting elements to CFT columns. It is hypothesized that such combinations of CFT columns and SMA connections will achieve excellent ductility, high strength, and recentering capability.

참고문헌 (9)

ABAQUS v. 6.6-1 (2006), Theory and User's Manual, Hibbit, Karlsson & Sorensen, Inc., Pawtucket, RI.
American Institute of Steel Construction (AISC). (2001), Manual of Steel construction, Load and Resistance Factor Design (LRFD), 3rd Ed., Chicago
Astaneh-Asl, A. (1995), Seismic Design of Bolted Steel Moment-Resisting Frames, Steel Tips published by Structural Steel Educational Council, Technical Informational &Product Service, July
Davide, F. (2003), Shape Alloy Devices in Earthquake Engineering: Mechanical Properties, Constitutive Modeling and Numerical Simulations, Master's thesis, Rose School in Italy.
Mazzoni, S., Mckenna, F., Fenves, G. L. (2006), OpenSEES Command Language Manual v. 1.7.3, Department of Civil Environmental Engineering, University of California, Berkley.
Penar, B. W. (2005), Recentering Beam-Column Connections using Shape Memory Alloys, Master's thesis, Georgia Institute of Technology.
Rassati, G. A., Leon, R. T., and Noe, S. (2004), Component Modeling of Partially Restrained Composite Joints under Cyclic and Dynamic Loading, J.of Structural Engineering, ASCE, v.130, n. 2, pp 343-351

상세보기
Swanson, J. A. and Leon, R. T. (2000), Bolted Steel Connections: Tests on T-Stub Components, J. of Structural Engineering, ASCE, v.126, n.1, pp 50-56

상세보기
Tsai K. C. et al. (2004), Pseudo Dynamic Tests of a Full-Scale CFT/BRB Composite

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연합인증

스마트 반강접 (PR) 콘크리트 충전 강재 합성 (CFT) 접합 구조물에 대한 해석모델의 개발
Development of A Component and Advanced Model for The Smart PR-CFT Connection Structure 원문보기

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스마트 반강접 (PR) 콘크리트 충전 강재 합성 (CFT) 접합 구조물에 대한 해석모델의 개발 Development of A Component and Advanced Model for The Smart PR-CFT Connection Structure 원문보기

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스마트 반강접 (PR) 콘크리트 충전 강재 합성 (CFT) 접합 구조물에 대한 해석모델의 개발
Development of A Component and Advanced Model for The Smart PR-CFT Connection Structure 원문보기

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