Week8_1

# Week8_1 - Looking into FBD(b you get ENGR210 Fall 2011 5...

This preview shows pages 1–7. Sign up to view the full content.

ENGR210, Fall 2011 1 Two-force members (re-visit) It is important to recognize two-force members in a system to solve problems efficiently. But is it absolutely necessary? Illustrative example: Determine the support reactions at A and C.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
ENGR210, Fall 2011 2 (The solution using the two-force member approach) Member BC is a two-force member. So, the FBD is There are 3 unknowns, so you can solve for the reactions. Done!
ENGR210, Fall 2011 3 If you fail to recognize the two-force member and draw a FBD like There are 4 unknowns, and you cannot solve for these. (Therefore, if you leave your FBD like this, you will have a trouble.)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
ENGR210, Fall 2011 4 However, if you separate the system into and Then, you have 6 unknowns and 6 equations (good).

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Looking into FBD (b), you get ENGR210, Fall 2011 5 These relations (Bx, By, Cx and Cy) means that the FBD (b) is equivalent to Therefore, in summary, even if you don’t recognize two-force members in a system, you CAN solve for unknowns IF you separate the system into subsystems (like (a) and (b) above). However, if you use a “whole” system without knowing two-force members, you have often difficulty solving for unknowns (like ( β ) above). Note that drawing FBDs for two-force members (without knowing two-force members), writing equilibrium equations with extra unknowns and solving for the unknowns take more time. So, be efficient , by identifying two-force members. ENGR210, Fall 2011 6 ENGR210, Fall 2011 7...
View Full Document

{[ snackBarMessage ]}

### Page1 / 7

Week8_1 - Looking into FBD(b you get ENGR210 Fall 2011 5...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online