Ez a rövid áttekintés mélyebben ás a Consteel megoldásába, egy alternatív szemléletet nyújtva az effektív keresztmetszeti tulajdonságok kiszámításához, és formálva a hagyományos megközelítéseket a szerkezeti elemzés és tervezés területén.

Határozzuk meg a 384-4 gerinclemezű és 300-8 övlemezű kétszersen szimmetrikus hegesztett I keresztmetszet szilárdsági kihasználtságát, amennyiben a keresztmetszet igénybevételei az N_Ed=500kN nyomóerő és az M_y,Ed=100kNm hajlító nyomaték.  A keresztmetszet anyaga S235 minőségű.

Keresztmetszeti jellemzők számítása

Először vegyük fel a keresztmetszet adatait (szimmetrikus hegesztett I szelvény), amely alapján a Consteel software generálja az EPS (és GSS) (Online Kézikönyv/10.1.1 EPS (vékonyfalú szelvény) modell) keresztmetszeti modellt (1. ábra):  

Amennyiben a keresztmetszet 4. osztályba tartozik, az effektív keresztmetszeti modellt a feltételezett normálfeszültségi eloszlás határozza meg. Az EC3-1-1 szerint a 4. keresztmetszeti osztályú szelvény EPS keresztmetszeti modellje kétféleképpen határozható meg:

• A módszer: tiszta igénybevételi állapotok alapján,
• B módszer: összetett igénybevételi állapot alapján.

Először az A módszerrel számoljuk ki a keresztmetszeti tulajdonságokat, majd a B módszerrel.

Keresztmetszeti jellemzők az A módszer alapján

• N_Ed nyomóerő esetén (2. ábra):
• A_eff=4720mm²

• M_y,Ed hajlító nyomaték esetén (3. ábra): 

W_eff,y,min=864080mm³

e_z=14.5mm

Keresztmetszeti jellemzők a B módszer alapján

A Consteelben a 3. és 4. osztályú szelvények keresztmetszeti interakciós ellenállása az EN 1993-1-1 6.2 képlet módosított változatával kerül kiszámításra, az öblösödés és a komponens ellenállások előjelhelyes figyelembevételével. Lássuk, hogyan…

Did you know that you could use Consteel to perform local and distortional buckling checks for cold-formed members?

First, sections must be loaded into the model. To load cold-formed sections, you can choose from four options: From library, Macro section, Draw section, or My library.

After the first-order and buckling analyses are completed, you can proceed to the Ultimate limit state check settings and enable the steel design cross-section and buckling checks. At the bottom of the steel design section, there is an option to Consider the supplementary rules from EN 1993-1-3 for the design of cold-formed sections. This checkbox must be selected if you want to design cold-formed sections.

When the calculation is finished, by opening the Section module, we can review all the properties of the Effective section of the elastic plate segment model. By opening each plate element, we can verify the length, effective length, thickness, effective thickness, slenderness, and reduction factor separately. In addition, the properties of the stiffeners can also be verified: area, moment of inertia, lateral spring stiffness, critical stress, reduction factor, compressive stress, reduced effective area, and reduced thickness.

Similarly, the stresses can also be checked from the Properties tab. In the colored figure or diagram view, all the calculated stresses can be seen together with their resultants.

Consteel automatically takes into account the effect of distortional buckling when calculating the effective sections of cold-formed thin-walled sections.

Moving on to the Standard resistance tab in the Section module, all calculated results can be verified, not only the dominant one. By opening the Global stability resistance check, we can see that, since we enabled the option to consider the supplementary rules from EN 1993-1-3 for the design of cold-formed sections, results are available both according to EN 1993-1-1 and according to EN 1993-1-3.

Download the example model and try it!

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Did you know that you could use Consteel to calculate effective cross-section properties for Class 4 sections?

Download the example model and try it!

If you haven’t tried Consteel yet, request a trial for free!

Did you know that you could use Consteel to draw a user-defined cross section and calculate its section properties?

Download the example model and try it!

If you haven’t tried Consteel yet, request a trial for free!

Did you know that you could use Consteel to include in your model a wide range of cold-formed macro sections?

For line member modelling, the cross-section must first be loaded into the model. In Consteel, there are four options to do this, either starting from the Section Administrator or directly during beam or column modelling: From Library, Macro Section, Draw Section, or My Library.

Cold-formed sections can be created using any of these four methods. Standard cold-formed cross-sections can simply be selected from the library. However, if a special cold-formed section is needed, it can be created via Macro Sections, including: RHS, CHS, L profile, Z shape, C shape, Sigma section, Zeta section, Hat section with stiffeners, double C section, double Sigma section, and double user-defined sections.

Macro sections are easy to create because the essential geometric characteristics are predefined, and the parameters can be modified intuitively. It is also possible to add profile stiffeners. Flange and web stiffeners can be configured in various forms, including single and double options. These defined stiffeners are included in the structural evaluation of distortional buckling, according to EN 1993-1-3.

The thickness tolerance category must be specified. This determines the design wall thickness for the section. In practice, macros follow the commonly applied tolerance categories used for coated steel sheet products.

If you want to use a double section, make sure to load into the model first the section that you want to duplicate.

For very special or unique sections, the Draw Section function can be used. This allows users to create fully custom cross-sections when standard or macro shapes are insufficient, by manually sketching the geometry.

Sections can be defined as cold-formed or general thin-walled, which determines how they are analyzed: cold-formed sections have uniform thickness and account for distortional buckling, while general thin-walled sections allow varied thicknesses and closed shapes, typically for welded or fabricated profiles.

This approach is especially useful for modelling unique shapes, prototypes, or as-built sections, giving full control over every segment to accurately capture geometries that standard libraries or macros cannot reproduce.

Download the example model and try it!

If you haven’t tried Consteel yet, request a trial for free!

Introduction

It is essential for the effective work of the design engineers to have a model which is easy to overview. In Consteel there are several functions to achieve that such as layers and portions, and also Member coloring by cross-section.

How it works

The color of the displayed objects is now determined by the object style settings in Options.

Layer color can overwrite these settings if the Layer style cell is checked on Layers dialog.

In the case of beam type members, it is also possible to set the color of the object according to the section it has defined. Coloring by member can be set with Object color setting dialog in the right bottom corner: