First Edition CHAPTER 8 Statics and Mechanics of
- Slides: 40
First Edition CHAPTER 8 Statics and Mechanics of Materials Ferdinand P. Beer E. Russell Johnston, Jr. John T. De. Wolf 응력의 개념(Concept of Stress) David M. Mazurek © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved.
First Edition Statics and Mechanics of Materials 전단응력 예 (볼트 체결 상황에 따라 1면, 2면 전단이 결정됨) (ㄴ) 1면전단 2면전단 그림 8. 9 그림 8. 10 그림 8. 11 그림 8. 12 (8. 5) © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. (8. 6) 8 - 14
First Edition Statics and Mechanics of Materials 문제 8. 1 풀이 핀 A의 전단응력 자유물체도: 전체벽걸이 핀 C의 전단응력 © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 22
First Edition Statics and Mechanics of Materials 문제 8. 1 링크 ABC의 최대 수직응력 B점의 평균전단응력 © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 23
First Edition Statics and Mechanics of Materials 문제 8. 2 풀이 볼트의 직경 지압응력에 대한 검토 © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 26
First Edition Statics and Mechanics of Materials 문제 8. 2 풀이 부재 양단의 치수 b 부재의 높이 h © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 27
First Edition Statics and Mechanics of Materials 안전계수 구조물 부재 혹은 기계는 사용응력 (working stresses)이 재료의 의 극한 강도(ultimate strength) 보다 작아야 한다. 안전계수가 필요한 이유: • 재료(품질)의 불확실성 • 하중조건의 불확실성 • 해석방법의 불확실성 • 반복하중의 영향 • 파괴의 형태 • 부실한 유지관리나 외부환경에 의한 열 화현상 • 전체 구조물에 대한 자유도 • 생명과 재산손실에 대한 위험도 • 구조물(기계)의 역할(기능)이 이루어 지 도록 안전계수 값은 다음 시방서(市方書, code, 法典)에 나와있다. 1. 강재 : AISC(American Institute of Steel Construction), Specification for Structural Steel Buildings 2. 콘크리트 : ACI(American Concrete Institute), Building Code Requirement for Structural Concrete 3. 목재 : Forest and Paper Association, NDS(National Design Specification for Wood Constrution 4. 고속도로 교량 : AASHTO(American Association of State Highway and Transfortation Officials), Standard Specifications for Highway Bridges 5. 도로교시방서, 콘크리트시방서 등 © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 33
First Edition Statics and Mechanics of Materials 문제 8. 3 풀이 자유물체도: 전체 브래킷 제어막대 AB © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 35
First Edition Statics and Mechanics of Materials 문제 8. 3 핀 C의 전단 지압 C의 지압 © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 36
First Edition Statics and Mechanics of Materials 문제 8. 4 풀이 자유물체도: 강체보 BCD 제어막대 © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 38
First Edition Statics and Mechanics of Materials 문제 8. 3 B점의 볼트 D점의 볼트 C점의 볼트 © 2011 The Mc. Graw-Hill Companies, Inc. All rights reserved. 8 - 39
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