구조역학실험_Grillage Design Assingment

소개

구조역학실험_Grillage Design Assingment 입니다.
Intersection Reaction Method 에의한 Grillage Analysis 입니다.
Intersection Reaction Method 에대한소개를 한 후 Grillage Analysis을 하였습니다.

목차

1. Grillage Analysis by Intersection Reaction Method
1.1 Assumptions
1.2 Method

2. Deflections and End Moments of Beam

3. Grillage Design Assignment
3.1 Example
3.2 Solution #(1) (All ends are simply-supported)
3.2.1 Free Body Diagram
3.2.2 Deflection Calculation
3.2.3 Bending Moment
3.2.4 Required Section Modulus(단면계수)
3.2.5 Total weight
3.2.6 Trial and Error Method
3.2.7 Conclusion (Simple Supported Beam Design)
3.3 Solution #(2)
3.3.1 Free Body Diagram
3.3.2 Deflection Calculation
3.3.3 Bending Moment
3.3.4 Required Section Modulus(단면계수)
3.3.5 Total weight
3.3.6 Trial and Error Method
3.3.7 Conclusion (Simple Supported Beam Design)

4. Conclusion

본문내용

1. Grillage Analysis by Intersection Reaction Method
1.1 Assumptions
(a) 탄성범위 내에서 거동하며, 처짐량이 미소하다.
(b) 각각의 보에 걸리는 Torsional Stiffness는 무시한다.
(c) 교차하는 지점은 용접 EH는 볼트로 접합이 잘되어 있다. (함께 거동한다.)
(d) Shear force에 의한 처짐은 무시한다.
(f) 각각의 보는 전체길이에 대하여 일정한 단면형상을 같는다. 하지만 각각의 보는 다른 크기를 가질 수 도 있다.
1.2 Method
a) Each member of grillage is considered separately as a beam loaded by;
any external loads which on it.
(Unknown) Reactions at points where it intersects other members
b) The deflection of each joint due to these loads is then expressed in terms of the loads, reaction and beam properties.
c) By equating the deflection of a beam joint with the deflection of the beam which intersects it (at that joint), the deflection can be eliminated, and one equation relating loads and reaction is obtained.
d) Solving all similar intersection reaction equation lead to value of reactions at all joints.
e) Hence, for each beam, bending moment, shearing force and deflection etc. can be found by usual methods.

4. Conclusion
Trial and Error Method로 해석해 본 결과 a-beam 과 b-beam 둘 중 하나의 빔을 고려하지 않고 설계하는 것이 효율적이므로 1x1Grillage구조는 비효율적이다.

참고자료

· 없음