臺灣博碩士論文加值系統

A total of 12 specimens with two different cross sections were tested under cyclic double curvature moment. Anti-buckling elements for preventing lateral torsional buckling are attached to five beam specimens tested in this experimental study. The result shows that all of the specimens tested can develop sufficient strength and exhibit adequate ductility. However, for the beam without any anti-buckling element installed and not properly braced, the twist angles are very large. The used of the anti-buckling element to the beam members can suppress the twist angle effectively as long as the anti-buckling elements have sufficient moment of inertia or length. The moment of inertia and length of the anti-buckling element are important parameters to the performance of anti-buckling element. Furthermore, the presence of top lateral bracing and L/ry ratio of the cross section affect the stiffness and length requirement of anti-buckling element.

A total of 12 specimens with two different cross sections were tested under cyclic double curvature moment. Anti-buckling elements for preventing lateral torsional buckling are attached to five beam specimens tested in this experimental study. The result shows that all of the specimens tested can develop sufficient strength and exhibit adequate ductility. However, for the beam without any anti-buckling element installed and not properly braced, the twist angles are very large. The used of the anti-buckling element to the beam members can suppress the twist angle effectively as long as the anti-buckling elements have sufficient moment of inertia or length. The moment of inertia and length of the anti-buckling element are important parameters to the performance of anti-buckling element. Furthermore, the presence of top lateral bracing and L/ry ratio of the cross section affect the stiffness and length requirement of anti-buckling element.

Acknowledgement i
Abstract ii
Table of Contents iii
List of Tables vii
List of Figures xi
List of Notations xix
CHAPTER 1: INTRODUCTION 1
1.1. Background 1
1.2. Objectives and scopes of research 3
1.3. Literature review 3
1.3.1. Chen et al [12] 3
1.3.2. Yeoh, H.J. (2016) [3] 4
1.3.3. AISC 341-16 (2016) [1] 5
1.3.4. Nakashima, et al (2002) [5] 5
1.3.5. Okazaki et al (2006) [6] 6
1.4. Outline of the thesis 7
CHAPTER 2: EXPERIMENTAL PROGRAM 9
2.1. Test specimens 9
2.1.1. Anti-buckling elements 10
2.1.2. TL-H1 series 11
2.1.3. TL-H3 series 11
2.1.4. FR-H1 series 11
2.1.5. FR-H3 series 12
2.1.6. Material mechanical properties 12
2.2. Experimental and instrumentation setup 13
2.3. Loading history 14
CHAPTER 3: EXPERIMENTAL RESULT AND DISCUSSION 15
3.1. General behavior and energy dissipation 15
3.1.1. General behavior 15
3.1.2. Energy dissipation 18
3.2. Strength and ductility 18
3.3. Twist angle 20
3.4. Beams with top flange lateral braces (TL-H1 series and TL-H3 series) 21
3.5. Beams without top flange lateral braces (FR-H1 series and FR-H3 series) 25
3.6. Effect of top lateral braces on moment of inertia and length requirement of anti-buckling element 29
3.7. Effect of L/ry variation on moment of inertia and length requirement of anti-buckling element 30
3.8. Discussions and summary 30
CHAPTER 4: CONCLUSION 32
REFERENCES 34

[1] AISC, Seismic Provisions for Structural Steel Buildings, ANSI/AISC 341-16, American Institute of Steel Construction (AISC), Chicago, IL, 2016.
[2] AISC, Specification for Structural Steel Buildings, ANSI/AISC 360-16, American Institute of Steel Construction (AISC), Chicago, IL, 2016.
[3] Yeoh, J. H. (2016). “Experimental behavior of H-shaped steel beam with buckling restraining system under cyclic loading.” Master thesis, National Taiwan University of Science and Technology.
[3] Salim, C. J. (2018). “Design method of H-Beam with side plates for seismic application.” Master thesis, National Taiwan University of Science and Technology.
[5] M. Nakashima, I. Kanao, D. Liu, Lateral instability and lateral bracing of steel beams subjected to cyclic loading, J. Struct. Eng. 128 (10) (2002) 1308–1316.
[6] Okazaki, T., Liu, D., Nakashima, M. and Engelhardt, M.D. (2006). “Stability requirements for beams in seismic steel moment frames.” Journal of Structural Engineering, 132 (9), 1334–1342.
[7] Lai, P. C. (2014). “Experimental behavior of H-shaped steel beam with torsional brace under cyclic loading.” Master thesis, National Taiwan University of Science and Technology.
[8] Wu, P. D. (2015). “Development of anti-buckling highly ductile steel beam.” Master thesis, National Taiwan University of Science and Technology.
[9] Tiara, R. (2016). “Lateral torsional buckling behavior of H-shaped steel beams with side plates under cyclic loading.” Master thesis, National Taiwan University of Science and Technology.
[10] Chen, C. C., Erwin, Salim. C. J., and Tiara, R. (2018), “Seismic performance of wide flange steel beams partly covered by side plates.” Journal of Construction Steel Research, 148C, 275–286.
[11] Chen, S.J, Yeh, C.H., Chu, J.M. “Ductile steel beam-to-column connection for seismic resistance.” Journal of Structural Engineering, ASCE 1996; 122(11):95-119.