KING & QUEEN POST TRUSS

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.

3. 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.

4. 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

5. 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.

6. THANK YOU !