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Structural design knowledge: how to conduct the design of steel component design?

Structural design knowledge: how to conduct the design of steel component design?

     How to carry out the design of steel component design?
     Component Design First choice of materials commonly used are Q235 and Q345 when reinforcing control action, choose Q345;.. When the stability control, use a Q235 typically use a single steel main structure in order to project manage economic considerations. You can also choose a combination of cross-section of different welding strength steels (flange Q345, web Q235). in addition, the welded structure should choose Q235B or Q345B.
     The current structure of the software, checking section provides post-processing capabilities. Some software may not pass component selected from a given increase the level of cross-section library automatically re-checking, until the adoption of such sap2000 so on. It is often said that one section optimization design features, it reduces a lot of work. But at least we should note two points:
     1. Software When do members (notably column) of section checking, fixed length factor to take sometimes does not meet the standard requirements. At present, all of the programs are not completely solve the problem. So, especially for complicated connections or nodes variable cross member, we should individually checked.
     2. When the first of the above (c) when the bar section does not meet the projected increase section two cases should be treated differently.
     (1) strength is not met, the composition generally increased cross-sectional thickness of the plate member, wherein the flange thickness to increase the bending is not satisfied, not satisfied to increase the shear web thickness.
     (2) deformation gauge, should not normally increase the thickness of the panel should consider increasing the height of the section, otherwise uneconomical.
Using software to automatically increase the preceding section optimization design features, it is difficult to consider the strength and stiffness of the above distinction, in fact, in addition to commonly used in grid design, the other structure is often not appropriate.