Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Analysis of Truss

Defination,Analysis of frames,stresses in frame,convention,
assumptions, solutions(analytical), Learning outcomes

Related Books

Free with a 30 day trial from Scribd

See all

Related Audiobooks

Free with a 30 day trial from Scribd

See all
  • Be the first to comment

Analysis of Truss

  1. 1. ANALYSIS OF TRUSS
  2. 2. Syed Raheel Zafar
  3. 3. WHAT IS TRUSS? • A truss is a structure comprising one or more triangular units constructed with straight members whose ends are connected at joints. • If all the bars lie in a plane, the structure is a planar truss. • The main parts of a planar truss.
  4. 4. ANALYSIS OF FRAME • A FRAME IS A STRUCTURE MADE OF SEVERAL BARS/ RODS WELDED / RIVETTED TOGETHER • THE BARS ARE ANGLE IRONS/ CHANNELS OF “I” OR “T” SECTIONS. THESE ARE CALLED MEMBERS • ON APPLICATION OF LOAD ON TO THE STRUCTURE, THE MEMBERS REMAIN LOADED WITH TENSILE/ COMPRESSIVE LOAD • MEMBERS UNDER TENSION • MEMBERS UNDER COMPRESSION • THE STRUCTURE FORMED BY THE MEMBERS IS CALLED “TRUSS” • EXTENSIVELY USED IN ROOF, BRIDGE, SHEDS ETC.
  5. 5. STRESSES IN A FRAME • UNDER APPLICATION OF LOAD THE STRUCTURE TENDS TO DEFORM. THE MATERIAL OF THE FRAME TENDS TO KEEP THE FRAME RIGID ( PREVENTS DEFORMATION) • AN INTERNAL RESISTIVE FORCE IS SET IN IN THE MATERIAL . THIS INDUCES STRESS. • σ = INTERNAL RESISTANCE / AREA • LOAD CAN BE PULL / PUSH (TENSILE/ COMPRESSIVE) • FOR JOINTS TO BE IN EQUILIBRIUM THE MEMBERS MAY CARRY ZERO LOAD/ TENSILE/ COMPRESSIVE LOAD.
  6. 6. CONVENTIONS • ANALYST HAS TO IDENTIFY THE SITUATION , MAKE A MENTAL PICTURE OF THE FORCES AND DECIDE THE ARROWS. • A LOAD WITH ARROW AWAY FROM THE JOINT IS TENSILE • A LOAD WITH ARROW TOWARDS THE JOINT IS COMPRESSIVE
  7. 7. ASSUMPTIONS MEMBERS ARE RIGIDILY JOINT (Every member of the truss is then in pure compression or pure tension – shear, bending moment, and other more complex stresses are all practically zero. ) •LOADS ACT ON THE JOINTS ONLY •WEIGHT OF THE MEMBER AS COMPARED TO THE EXTERNAL LOADS IS NEGLIGIBLE AND NOT CONSIDERED FOR CALCULATIONS.
  8. 8. SOLUTIONS ANALYTICAL • USE OF TRIGONOMETRY/ GEOMETRY/ ALGEBRA • TWO METHODS (JOINT & SECTION METHODS) • THE METHODS CAN BE CUMBERSOME AND LENGTHY AND LEAD TO ERRORS • A COMPARISON ON NEXT SLIDE GRAPHICAL • USE OF CONCEPT OF ENGG DRG • USE OF SPACE, VECTOR DIAGRAM AND A LOAD TABLE • VECTOR DIAGRAM OF EACH JOINT (MAXWELL DIAGRAM) AND COMPOSITE VECTOR DIAGRAM GIVES THE SOLUTION • SELECT THE 1ST JOINT WITH 2 UNK FORCES AND THEN PROCEED TO THE NEXT JOINT • IT IS SIMPLE , EASY AND FULL PROOF • INITALLY ANALYTICAL METOD TOBE USED FOR CALCULATION OF REACTIONS
  9. 9. ANALYTICAL SOLUTIONS JOINT METHOD • FORCES OF EA JOINT IS ANALYSID ONE BY ONE • SELECT A JOINT WITH 2 UNK FORCES • ANALYSE THE FORCES AT THAT JOINT MATHEMATEICALLY AND THEN PROCEED TO THE NEXT • FOR COMPLEX FRAME THIS METHOD IS VERY LONG AND CAN LEAD TO MATHEMATICAL ERRORS SECTION METHOD • THE FRAME IS CUT INTO SECTIONS • EA SECTION IS THEREAFTER ANALYSED USING FBD • MOMENTS OF EACH MEMBER W.R.T. A REF POINT IS CALCULATED AND THE FORCES ARE BVDETERMINED • SECTION LINE MUST NOT CUT MORE THAN 3 MEMBERS • IT IS VERY TEDIOUS FOR COMPLEX STRUCTURES
  10. 10. LEARNING OUTCOME • Types of joints and supports • Zero force members • Material choice • Factor of safety • Design analysis • Trial and error

    Be the first to comment

    Login to see the comments

  • Sirajayyy

    Dec. 14, 2015
  • elainrosediana

    Mar. 25, 2017
  • ShreyaShah112

    Feb. 25, 2018
  • KanmaniKannu

    Sep. 13, 2018
  • rohancool796

    May. 29, 2019
  • SandeepGladden1

    May. 12, 2020

Defination,Analysis of frames,stresses in frame,convention, assumptions, solutions(analytical), Learning outcomes

Views

Total views

3,423

On Slideshare

0

From embeds

0

Number of embeds

15

Actions

Downloads

165

Shares

0

Comments

0

Likes

6

×