1.PKPM about the interpretation of the deflection (from PKPM program description)
Steel beam deflection chart are given (constant load live load), steel beam deflection diagram (live load) under standard value. When checking specification for "light housing of portal frame steel structure technology procedures" (CECS 102:2002), given roof inclined beams, steel beam deflection of the standard value (constant load live load) under the slope change the map, slope the rate of change control procedures required not more than 1/3. The significance of the various graphics output is as follows:
1) Absolute deflection diagram span L is the "beams the distance between two adjacent column, the maximum deflection values υ, refers to the span within the beam in constant live" or "live" the Dutch role under the maximum vertical value to the deformation. Flexible span ratio as a basis for the calculation and control: υ / L ≤ [υ / L]. The values of the beam upper middle position indicates this cross beam torsion cross ratio υ / L, the beams the lower value indicates the value of the cross-largest deflection υ, unit: mm maximum deflection position in the cross. When checking is not satisfied, υ, υ / L values are shown in red.
2) relative deflection chart span L is the "the crossbar single slope slope length, maximum deflection values υ, refers to within a single slope slope length, beam in constant live" or "live" under the Dutch role relative deflection values. Flexible span ratio as a basis for the calculation and control: υ / L ≤ [υ / L]. The the beam upper middle position value, said torsion of the beam segment span ratio υ / L, the lower value of the beam, the maximum relative deflection of the beam segment, the value of the maximum deflection of the beam segment υ, unit: mm. When checking is not satisfied, υ, υ / L values are shown in red.
3) inclined beams calculate the slope map, only when checking specifications the gantry frame light house steel structure technical regulations (CECS 102:2002), an output checking content. Inclined beams in the role of the standard value (constant load live load), the slope of the steel beam deflection of change control, the slope of the rate of change control procedures required not more than 1/3 gauge future, the graphics are displayed in red.
Description: the relative deflection absolute deflection deflection values for a cross double slope difference is very large; For there is only one cross in a sloping or horizontal beam, the deflection of the two is exactly the same value. Relative deflection for deflection control, the program the absolute deflection flexible span ratio, span ratio control user input parameter input allowable scratch. The design should be selected according to the actual situation of the project control. By the right [control parameter menu item, torsion of steel beams cross view than the control parameters, modify, modify real-time display will modify the control results.
2.3d3s w / L of explain to (from 3d3s10.0 basic instructions)
Portal frame L meaning: (from << gantry frame light house steel structure design and construction difficult problem DEFINITIONS >>)
4 L more authoritative description: (from the steel structures magazines door steel errata)
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