Seismic Performance of Braced Frames with Buckling Restrained Slit Pipe Dampers

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研究生：	英德拉 Indra Rio Saputro
論文名稱：	Seismic Performance of Braced Frames with Buckling Restrained Slit Pipe Dampers Seismic Performance of Braced Frames with Buckling Restrained Slit Pipe Dampers
指導教授：	許協隆
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 土木工程學系 Department of Civil Engineering
論文出版年：	2018
畢業學年度：	106
語文別：	英文
論文頁數：	131
中文關鍵詞：	切縫鋼管挫屈束制阻尼器、耐震行為、消散能量、斜撐構架
外文關鍵詞：	Buckling restrained slit pipe dampers, Seismic performance, Energy dissipation, Braced frames
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本研究中提出一種新型阻尼器，並將其命名為「切縫鋼管挫屈束制阻尼器」。此阻尼器同時結合了鋼管與挫屈束制斜撐的特性，在結構物受側向力時，有效展現良好的消能能力。在此消能器中，以最外層鋼管提供束制作用，並利用填充之混凝土控制內層切縫鋼管之後挫屈行為。內層鋼管的切縫設計，可提供不同的結構消能能力，此切縫鋼管的塑性行為可對整體結構提供穩定的消能表現。
研究中針對一系列切縫鋼管挫屈束制阻尼器及配置此阻尼器之半剛接構架進行反覆載重試驗。試驗結果發現，若在阻尼器內層鋼管內做適當的切縫，斜撐構架可在位移比2.5%內展現良好的強度表現和消能能力。由試驗結果比較中得知，加裝切縫鋼管挫屈束制阻尼器的斜撐構架，能有效地提升整體構架在強度、勁度、變形及能量消散上的能力，因此，此阻尼器應為有效之結構耐震性能提升設計。

A new energy dissipation device that combined the BRB and pipe damper systems to form the buckling restrained slit pipe dampers (BRSPD) is proposed. This device incorporates a slit pipe damper that is limited by the inner tube. The outer tube was used as a restraining mechanism. Slit in the pipe is used to control energy dissipation and deformation capacity. This damper is designed to provide adequate hysteretic performance through core yielding under both tension and compression.
A series of cyclic loading tests were conducted on the BRSPD and semi-rigid frames with the proposed devices. It was found that the BRSPD sustained significant strength and energy dissipation capability before reaching 2.5% drift ratio, if adequate number of slits in the core pipe was used. Comparisons of the test results showed that the frame strength was increased when the buckling restrained slit pipe dampers were adopted. Significant gains in strength, stiffness, deformation capacity and energy dissipation for framed structures with BRSPD justified the effectiveness of the proposed design.

ABSTRACT    i
摘要    ii
ACKNOWLEDGEMENTS    iii
TABLE OF CONTENTS    iv
LIST OF TABLES    viii
LIST OF FIGURES    ix
CHAPTER 1    1
INTRODUCTION    1
A.    Introduction    1
B.    Motivations    2
C.    Objectives    3
D.    Outlines    3
CHAPTER 2    4
LITERATURE REVIEW    4
A.    Inelastic Postbuckling and Cyclic Behavior of Tubular Braces    4
B.    Pipe Dampers    5
C.    Concentrically Braced Frame    6
D.    Steel Frames with Semi-Rigid Connection    6
E.    Top and Seat Angle    7
F.    Theoretical study on design methods of BRB    8
CHAPTER 3 METHODOLOGY    9
A.    Theory    9
1.    Strong Column Weak Beam Philosophy    9
2.    Bolted Top and Seat Angle Connection    11
3.    Double web angle with slot connection    11
4.    Buckling restrained slit pipe dampers    11
5.    Braced frame with buckling restrained slit pipe dampers    11
6.    Bending Capacity of Beam    12
7.    Hinge Gussets and High Strength Bolt    13
8.    Strength of buckling restrained slit pipe dampers    13
B.    Finite Element Analysis    15
1.    Analytical model for buckling restrained slit pipe damper simulation    ……………………………………………………………………………15
2.    Analytical model for frames with buckling restrained slit pipe dampers    ……………………………………………………………………………16
3.    Chaboche kinematic hardening for cyclic analysis    18
4.    Concrete for restrainer analysis    18
C.    Mechanism of damper    19
CHAPTER 4 EXPERIMENTAL PROGRAM    20
A.    General    20
B.    Specimen Design    20
1.    Set-Up for Component Tests    22
2.    Set-up for Braced Frame Tests    22
C.    Details Of Specimens    22
1.    Brace member    22
2.    Component Test    23
3.    Semi Rigid Moment Frame    23
4.    Braced Frame    24
D.    Materials    24
1.    Steel structures    24
2.    Concrete    25
E.    Specimen Construction    25
F.    Instrumentation    25
1.    Strain Gauges    25
2.    Transducers    26
3.    Data Acquisition System    26
G.    Lateral Support    26
F.    Loading Protocol    26
CHAP TER V RESULT AND OBSERVATION    27
A.    General    27
B.    Experimental Observations    27
C.    Component Tests    27
1.    Specimen SL 8-4    27
2.    Specimen SL 8-2    28
3.    Specimen SL 6-4    29
4.    Specimen SL 6-2    30
5.    Specimen SL 4-4    31
6.    Specimen SL 4-2    32
D.    Frame Tests    33
1.    Specimen MRF 12    33
2.    Specimen BRF 6-4    34
3.    Specimen BRF 6-2    34
4.    Specimen BRF 4-4    35
5.    Specimen BRF 4-2    36
CHAP TER VI    37
COMPARISONS AND DISCUSSIONS    37
A.    General    37
B.    Comparisons of Strength between Experimental and Analytical Results    37
1.    Finite Element Simulation    37
2.    Stiffness    37
3.    Strength    38
4.    Deformation Capacity    39
5.    Energy Dissipation    40
6.    Performance Evaluation    40
7.    Design Recommendations    41
CHAP TER VII    42
CONCLUSIONS    43
A.    General    43
B.    Suggestions    44
REFERENCES    45
TABLES    48
FIGURES    57


                                

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