Truss
Truss
Truss
Truss frame: generally composed of straight rod with triangular elements of plane or space structure frame, generally for the
square column type, usually for speaker hang, outdoor temporary exhibition and background of frame structures.Also known as
the truss.
Generally composed of straight rod with triangular elements of plane or space structure.Under loads, the truss rods mainly bear
axial tension or stress, which can make full use of the strength of the material, the span is larger than the plain girder to save
material, reduce weight and increase the stiffness of the bearing structure of reason is suitable for large span and tall structures,
such as roof, bridge, transmission line tower, satellite towers, gate, crane frame, etc.
Structure classification
Triangle truss, under uniformly distributed along the span of the node load, on the lower chord axial force at the endpoints of the
biggest, to gradually reduce across;The axial force of CHS, on the other hand.Because triangle truss chord internal force difference
is bigger, material consumption is not reasonable, more used in WaWu roof truss below.
Trapezoid truss, compared with the triangle truss bar stress situation has improved, and used in roof can more easily meet the
technological requirements in some industrial buildings.If the trapezoid parallel to the upper and lower chord of the truss is parallel
chord truss, bar stress distribution is trapezoidal slightly less, but greatly reduced diagonal type, more used in Bridges and piers.
Polygon truss, also calls the mansard truss.Top chord node on the quadratic parabola, such as arched top chord can reduce
internode load generated by bending moment, but manufacturing is more complicated.Under uniformly distributed load, truss and
beam bending moment graph similar appearance, and so on bottom chord axial force distribution even, diagonal axial force is small,
the materials the most provinces, a truss form is commonly used in engineering.
Vierendeel truss, the basic access the shape of the polygon truss, the string between nodes for the straight line, without the oblique
abdominal rod, connected with only vertical web member and the lower chord.Axial force distribution of bar truss and polygon are
similar, but under asymmetry load rod end bending moment value change is bigger.Advantage is that the node is the intersection of
bar is less, construction convenient manufacturing.
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