Lecture 14-20 - Two TwoandThreeforceMembers

Info iconThis preview shows pages 1–17. Sign up to view the full content.

View Full Document Right Arrow Icon
o and Three rce Members Two and Three force Members A two force member is subjected to no couple moments and forces are applied to only two points on the member. Weight is neglected. Notice that the two forces are collinear.
Background image of page 1

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

View Full DocumentRight Arrow Icon
Two force members will maintain translational (or force) equilibrium if F A and F B are equal and opposite.
Background image of page 2
Two force members will maintain rotational (or moment) equilibrium if F A and F B are collinear. Therefore, only the magnitude of the force must be determined, since the direction can be determined by the line AB .
Background image of page 3

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

View Full DocumentRight Arrow Icon
A three force member is subjected to only three forces that must be either concurrent or parallel . LOA’s are parallel and intersect at infinity 0 = P M P 0 = M
Background image of page 4
Background image of page 5

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

View Full DocumentRight Arrow Icon
Background image of page 6
usses Trusses A truss is a structure composed of slender members joined together at their nd points two rce members end points…two force members. Welded, bolted, or riveted to a gusset plate Connected with large bolt
Background image of page 7

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

View Full DocumentRight Arrow Icon
truss can only be loaded at the joints, A truss can only be loaded at the joints, and the members are assumed to be weightless (negligible).
Background image of page 8
Top chords Bottom chords Web p and bottom chords usually carry significantly Top and bottom chords usually carry significantly higher loads than the web elements.
Background image of page 9

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

View Full DocumentRight Arrow Icon
f t til l ld d th Roof trusses are typically loaded on the top joints whereas bridge trusses are typically loaded on the bottom joints.
Background image of page 10
Truss Assumptions: 1) Loaded only at joints which are assumed to be pinned ) omposed entirely of two rce members 2) Composed entirely of two force members 3) Neglect weight (weightless) Warren truss Tension –force points away ompression rce points toward Compression – force points toward
Background image of page 11

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

View Full DocumentRight Arrow Icon
ough actual trusses are seldom pinned joints or connections they are Though actual trusses are seldom pinned joints or connections, they are designed such that the couple moments exerted at the joints are small compared to the axial forces!
Background image of page 12
uss Analysis: Method of Joints Truss Analysis: Method of Joints First step is to draw a F.B.D. and solve for the reactions.
Background image of page 13

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

View Full DocumentRight Arrow Icon
uss Analysis: Method of Joints Truss Analysis: Method of Joints Second , examine the axial forces acting on the joints (equilibrium of a particle)…start with knowns.
Background image of page 14
uss Analysis: Method of Joints Truss Analysis: Method of Joints o ways of viewing at the joint Two ways of viewing at the joint… Cut through member T AB B Look at forces on pin T AC 60 o T AC T AB 60 o 500 N 500 N
Background image of page 15

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

View Full DocumentRight Arrow Icon
uss Analysis: Method of Joints
Background image of page 16
Image of page 17
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/29/2010 for the course EGN 3311 taught by Professor Nohra during the Spring '08 term at University of South Florida - Tampa.

Page1 / 65

Lecture 14-20 - Two TwoandThreeforceMembers

This preview shows document pages 1 - 17. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online