Impact response and shear fragmentation of RC buildings during progressive collapse

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姓名

阮督覃(Nguyen Duy Thang) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

Impact response and shear fragmentation of RC buildings during progressive collapse
(Impact response and shear fragmentation of RC buildings during progressive collapse)

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摘要(中)

This thesis presents a numerical progressive collapse of reinforced concrete (RC) building structures by applying the Vector Form Intrinsic Finite Element (VFIFE) method. The nonlinear behavior of structural collapse under various seismic excitations will be analyzed. The whole progressive collapse procedures of framed structures are displayed step by step following the time. Moreover, during the time collapse, the impact response and shear fractural of RC element are considered and simulated.
The VFIFE method by using Newmark-β method defines the structure into numbers of mass point and applies Newton’s second law and internal force equilibrium to describe the motion of each mass points. To predict failure and separation of elements, VFIFE method considers larger rigid body motions and large deformations.
Various types of frame buildings are analyzed. All possible locations of plastic hinge in the column and beam are simulated by bilinear springs. Different ground motions and scales from 100% to 600% are used for various input motion. From the numerical analysis result, we demonstrate the capability and accuracy of VFIFE method in nonlinear dynamic to handle extremely larger deformation, impact response and shear fracture of frame structures.

摘要(英)

本研究利用向量式有限元素(Vector Form Intrinsic Finite Element, VFIFE)模擬分析混凝土建築連續倒塌行為。研究內容將對各震波下結構倒塌之非線性行為進行分析，並將結構以構架型式利用動畫依時間步幅逐步顯示其倒塌行為，探討與分析各步幅混凝土元素之衝擊反應與剪力破壞行為。
VFIFE係利用Newmark-β將結構數值模型以節點表示，並以牛頓第二定律計算每個節點之動力方程。為了預測其破壞及節點間之行為，VFIFE數值方法考慮較大之剛體位移與變形。
研究將分析不同形式的數值模型，而數值模型中將可能產生塑鉸之梁柱接頭以雙線性彈簧模擬。數值分析所用的各震波放大倍率由100%至600%。從數值分析結果可以發現，VFIFE有效且精準的非線性動力分析，可處理構架大變形行為、衝擊反應以及剪力破壞。

關鍵字(中)

★ 構架建築
★ 空間向量式有限元素
★ 衝擊反應
★ 大變形
★ 塑性鉸
★ 剪力破壞

關鍵字(英)

★ Frame building
★ shear fracture
★ impacted response
★ large deformation
★ plastic hinge
★ vector form intrinsic finite element

論文目次

LIST OF CONTENTS
Pages

摘要 i
ABSTRACT ii
LIST OF CONTENTS iii
LIST OF FIGURES vi
CHAPTER 1 INTRODUCTION 1
1.1 Background 1
1.2 Literature Review 2
1.2.1 Vector Form Intrinsic Finite Element 2
1.2.2 Impact response of Reinforce Concrete (RC) element 4
1.2.3 Shear fracture of RC element during impact 5
1.3 Research Objectives 5
1.4 Outline 6
CHAPTER 2 THE VECTOR FORM INTRINSIC FINITE ELEMENT 7
2.1 Introduction of Vector Form Intrinsic Finite Element 7
2.2 Assumptions of VFIFE 7
2.3 Kinematics of a Frame Element 8
2.3.1 Deformation Coordinates 8
2.3.2 Rigid Body and Deformation Components 10
2.3.3 Internal Nodal Forces for the Frame Element 12
2.3.4 Equations of Motion 17
2.4 Newmark β-method 19
CHAPTER 3 IMPACT AND FRAGMENTATION ALGORITHM 23
3.1 Impact response algorithm of reinforce concrete element 23
3.2 Shear fracture algorithm of reinforced concrete element 26
CHAPTER 4 NUMERICAL EXAMPLE AND NUMERICAL RESULT 31
4.1 1-bay 3-story plane frame building 31
4.1.1 Numerical model of plane building 32
4.1.2 Numerical simulation result of plane building 34
4.1.2.1 EI Centro ground motion 34
4.1.2.2 JMA Kobe ground motion 34
4.1.2.3 Sylmar ground motion 35
4.2 2-bay 3-story plane frame building 36
4.2.1 Numerical model of plane building 36
4.2.2 Numerical simulation result of plane building 39
4.2.2.1 EL-Centro ground motion 39
4.2.2.2 JMA Kobe ground motion 39
4.2.2.3 Sylmar ground motion 40
4.3 2-bay 10-story plane frame building 41
4.3.1 Numerical model of plane building 42
4.3.2 Numerical simulation result of plane building 45
4.3.2.1 EL Centro ground motion 45
4.3.2.2 JMA Kobe ground motion 46
4.3.2.3 Sylmar ground motion 46
CHAPTER 5 CONCLUSIONS AND RECOMMENDATION 48
5.1 Conclusions 48
5.2 Recommendation 48
REFERENCES 49

參考文獻

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指導教授

李姿瑩(Tzu-Ying Lee)

審核日期

2013-8-26

推文