DESCRIBE ABOUT KING & QUEENPOST TRUSS

1. KING & QUEEN POST
TRUSS( MATERIALS & CONSTRUCTION )
PRESENTED BY –
AJOY GHOSH
RRSA DURGAPUR

2.  KING POST TRUSS :
A KING POST IS A CENTRAL VERTICAL POST USED IN ARCHITECTURAL OR BRIDGE
DESIGNS, WORKING IN TENSION TO SUPPORT A BEAM BELOW FROM A
TRUSS APEX ABOVE.
A KING POST TRUSS CONSISTS OF THE FOLLOWING COMPONENTS :
• TIE BEAM.
• TWO INCLINED PRINCIPAL RAFTER.
• TWO STRUTS.
• KING POST.
• RIDGE BEAM.
 THE PRINCIPAL RAFTERS SUPPORT THE PURLINS.
 THE COMMON RAFTER SUPPORT THE COVERING AS USUAL
THE SPACING OF THE KINGPOST TRUSS IS LIMITED TO 3 M CENTRE TO
CENTRE
 THE TRUSS IS SUITABLE FOR SPANS VARYING FROM 5 TO 8 M
 THE PRINCIPAL RAFTER IS JOINTED TO THE TIE BEAM BY A SINGLE
ABUTMENT AND TENON JOINT OR BY A BRIDLE JOINT.

4. KING POST TRUSSES
• THE KING POST TRUSS TAKES ADVANTAGE OF
THE WELL KNOWN FACT THAT A TRIANGLE IS AN
EXTREMELY RIGID SHAPE.
• THE PRINCIPAL
RAFTERS AND A TIE BEAM FORM A TRIANGLE WHICH IS
BRACED BY THE KING POST RUNNING
FROM THE CENTRE OF THE TIE BEAM TO THE ROOF RIDGE.

5.  QUEEN POST TRUSS :
• A QUEEN POST IS A TENSION MEMBER IN A TRUSS THAT CAN SPAN LONGER OPENINGS
THAN A KING POST TRUSS.
• A QUEEN-POST BRIDGE HAS TWO UPRIGHTS, PLACED ABOUT ONE-THIRD OF THE WAY
FROM EACH END OF THE TRUSS. THEY ARE CONNECTED ACROSS THE TOP BY
A BEAM AND USE A DIAGONAL BRACE BETWEEN THE OUTER EDGES.
• THE CENTRAL SQUARE BETWEEN THE TWO VERTICALS IS EITHER UNBRACED (ON
SHORTER SPANS), OR HAS ONE OR TWO DIAGONAL BRACES FOR RIGIDITY.
QUEEN POST TRUSS CONSISTS OF FOLLOWING COMPONENTS :
• TWO QUEEN POSTS
• TWO PRINCIPAL RAFTERS
• STRUTS
• TIE BEAM
• STRAINING BEAMS
• STRAINING SILLS
• PURLINS

7. QUEEN POST TRUSS
• A QUEEN POST TRUSS DIFFERS FROM A KING POSTY TRUSS IN
HAVING TWO VERTICAL POSTS.
• THE VERTICAL POSTS ARE KNOWN AS QUEEN POST
TWO STRUTS ARE PROVIDED TO JOIN THE FEET OF EACH QUEEN-
POST TO THE PRINCIPAL RAFTER.
• THE STARINING BEAMS RECEIVES THE THRUST FROM THE
PRINCIPAL RAFTERS, AND KEEPS THE JUNCTION IN STABLE
POSITION.
• A STRAINING SILL IS INTRODUCED ON THE TIE BEAM BETWEEN
THE QUEEN POSTS.
• SUITABLE SPANS FOR QUEEN POST TRUSS IS 8 TO 12 M.