Eurocodice 3 Design membro

Software di progettazione di elementi in acciaio per Eurocodice 3 (NEL 1993-1-1:2005)

Among the many design standards SkyCiv offers is Eurocode 3 (NEL 1993-1-1:2005), Euro. The module checks hot-rolled and welded steel members to the Ultimate Limit State, with a deflection check for the Serviceability Limit State. It runs in SkyCiv Structural 3D, where it reads the members, sezioni, materiali, forces and load combinations of your model.

Con questo modulo puoi:

• Design I-shapes, Forme a T, angoli, channels and hollow sections (RHS, SHS and CHS)
• Classify the cross-section (Classe 1, 2, 3 o 4) for each load combination and limit state, with effective properties for Class 4 sezioni
• Check the resistance of cross-sections to tension, compressione, bending about both axes and shear, including the reduction of the yield strength for high shear
• Check the combined resistance of cross-sections (bending and axial force)
• Check the buckling resistance of members: flessionale, torsional and torsional-flexural buckling in compression, lateral-torsional buckling in bending, and combined bending and axial compression with the interaction factors of Annex A or Annex B
• Split each member into lateral-torsional buckling segments, with C₁ calculated from the bending moment diagram or entered by you
• Optionally check torsion (basic stress check) for I-shapes and rectangular hollow sections
• Check the slenderness ratio (KL/r) against limits for compression and tension, optionally shown in the detailed report
• Check deflections against a span/deflection limit
• View the design ratios on the 3D model
• Export detailed step-by-step reports and a summary report, as HTML or PDF (Logo personalizzato acceso Enterprise)
• Controlli di taglio (Esegui Designer) per trovare la sezione più efficiente
• Completamente verificato con risultati di terze parti

Supporto della versione corrente

sezioni

• I-Beam (I-shapes and H-shapes, hot-rolled or welded)
• T-Beam
• Angolo
• o scanalatura
• Rettangolare vuoto (RHS and SHS)
• Circolare cava (CHS)

The material must be steel. A Class 4 circular hollow section is outside the scope of the module and stops the check with an error message.

unità

The module only works in metrico unità. Nel modello, Aperto impostazioni (barra superiore) > unità e impostare il sistema di unità su metrico.

Design in SkyCiv Structural 3D

Questo modulo è completamente integrato con il nostro potente software di analisi strutturale che consente agli ingegneri di modellare, analizzare e progettare con un modello. Con un solo clic, the software pulls your entire model and checks each member against the criteria of the Standard to determine whether or not it passes the requirements of these European Standards. Carichi, members and design parameters are imported automatically, including the load combinations from EN 1990.

Clicca qui per informazioni più generali sul nostro Integrato Software di progettazione strutturale

Apertura del modulo

1. Risolvi il modello.
2. Clic Design nella barra in alto.
3. Nel Seleziona un modulo di progettazione, scegliere Di seguito è riportato un esempio di alcuni calcoli della piastra di base americana comunemente utilizzati nella progettazione della piastra di base.
4. Nel Quale codice di progettazione vorresti iniziare?, scegliere Eurocodice 3 (NEL 1993-1-1:2005), quindi fare clic Inizio.

Starting a design code deletes the design data of the previous one. To switch codes later, uso Inizia nuovo codice nel Design menù.

Il pannello di progettazione si apre a sinistra, con il modello 3D a destra. L'intestazione mostra il codice, più Richiedi funzionalità e Esegui Designer. A destra della barra delle schede ci sono tre pulsanti: le impostazioni (ingranaggio) pulsante, che si apre Impostazioni progettazione membro, il pulsante di registro, che apre il Registro di progettazione dei membri, e Dai un'occhiata, che esegue la verifica del progetto. Le schede sono Dettagli, Fattori, Membri, Forze e risultati.

Impostazioni progettazione membro

Fare clic sul pulsante dell'ingranaggio per aprire Impostazioni progettazione membro. Passa il mouse sopra l'icona ℹ accanto a un'impostazione per visualizzarne la descrizione.

Collocamento	La resistenza alla compressione sarà considerata come da AS4600	Descrizione
Perform the Torsion check (Controllo dello stress di base) if the threshold is exceeded	Deselezionato	Runs the torsion check of I-shapes and rectangular hollow sections when the torsional moment exceeds the threshold. Quando deselezionato, the torsion check is skipped whatever the threshold
General Threshold for Torsional Moment check	0 kN-m	The torsional moment (in absolute value) above which the torsion check is performed, for all members whose Tlimite è auto nel Membri tab
Major Bending Moment Threshold for Section Classification	0.001 kN-m	Bending about the major axis is included in the overall section classification of a limit state only when the moment exceeds this value
Minor Bending Moment Threshold for Section Classification	0.001 kN-m	Lo stesso, for bending about the minor axis
Compression Threshold for Section Classification	0.001 kN	Compression is included in the overall section classification of a limit state only when the compression force exceeds this value
Compression Utilization Ratio Threshold for Section Classification	0	Compression is included in the overall section classification only when its utilization ratio exceeds this value. It applies to all the limit states other than compression
Show slenderness check in the report	Deselezionato	Adds the slenderness check to the detailed report of each member, vedere Slenderness Ratio Check sotto

The classification thresholds keep very small forces from governing the class of a section: per esempio, a beam with a negligible axial force is not classified as if it were in pure compression. Come nota la finestra di dialogo, è necessario utilizzare le indicazioni tecniche quando si modificano queste impostazioni. Clic Salva applicare.

Dettagli

Sul Dettagli scheda è possibile inserire i dettagli del progetto (Azienda, Nome del progetto, progettista, ID progetto, Cliente e Note di progetto). Non è necessario compilarli, but anything you enter is shown in your reports. Unità di progetto spettacoli metrico e non può essere modificato qui.

Fattori

La Fattori tab shows the partial factors for resistance, which you can change:

Fattore	Used for	La resistenza alla compressione sarà considerata come da AS4600
cM0	Resistance of cross-sections	1.0
cM1	Resistance of members to instability (deformazione)	1.0
cEurocodice di design con piastra di base in acciaio	Resistance of cross-sections in tension to fracture (net section)	1.25

Membri

La Membri La scheda elenca i membri del progetto, with one row for each member of the model. ID membro(S), ID materiale, ID sezione e L come from the model. The buckling lengths and the other parameters are filled in with default values that you can change. Hover over the ℹ icon in a column header to see its description.

• Espandi larghezza tabella: shows the full column headers and values, with a horizontal scroll bar.
• Add Missing Members, Questi numeri provengono dall'American Standard AISC e Clear All: add the model members that are not in the table, add a design member, or remove all of them. Enter several member IDs, separati da virgole, pollici ID membro(S) to design them as a single design member.

Colonna	Descrizione	La resistenza alla compressione sarà considerata come da AS4600
Lyy, Kyy	Buckling length and effective length factor for flexural buckling about the y-y (major) asse, used to calculate Ncr	Lyy = member length, Kyy from the end fixity of the member
Lzz, Kzz	Lo stesso, about the z-z (minor) asse	Lzz = member length, Kzz from the end fixity of the member
Lcr	Buckling length for lateral-torsional buckling. Enter the member length, or comma-separated lengths, one for each segment between lateral restraints	Lunghezza del membro
Kij metodo	Method used to calculate the interaction factors: A (Annex A, alternative method 1) o B (Allegato B, alternative method 2)	B
Kyy, Kyz, Kzy, Kzz	Interaction factors for bending and axial compression (Eq. 6.61 e 6.62). Con auto, they are calculated with the method chosen in Kij metodo	auto
C1	Moment modification factor for the elastic critical moment Mcr. Con auto, it is calculated from the bending moment diagram of each segment. Enter a single value for all the segments, or comma-separated values, one for each segment	auto
SRC, SRT	Slenderness limits in compression and in tension, vedere Slenderness Ratio Check sotto	200, 300
Tlimite	Torsional moment threshold for the torsion check of this member. Con auto, the general threshold of the settings is used. The torsion check must be ticked in the settings	auto
DefL	Rapporto limite di deflessione: the member passes when span/deflection is at least this value	250
Cantilever y-axis, Cantilever z-axis	Tick if the deflection check should consider the member as supported at one end only, for deflection along that axis	Deselezionato

Per esempio, per un 10.1 m rafter with purlins every 2.02 m, accedere 2.02,2.02,2.02,2.02,2.02 pollici L_cr. The lengths must add up to the member length (entro 1%). Each segment is then checked for lateral-torsional buckling with its own length and C₁. If you enter a single length that is different from the member length, C₁ can’t be calculated automatically and must be entered as a number.

Forze

La Forze tab sets the load combination used in the design. Per impostazione predefinita, Automatically use the worst case Load Combination checks every strength load combination of the model and reports the worst one for each check. You can also select a single load combination. Serviceability combinations are not listed here: they are used for the deflection check.

To view the forces of a load combination, select it in Select a load combination to view the maximum forces in the fields below, e fare clic Download Results to View.

risultati

Clic Dai un'occhiata per eseguire la verifica del progetto. La risultati mostra la scheda (numbered as in the screenshot below):

1. Mostra rapporti di progettazione per: chooses which ratios are shown on the 3D model, per esempio Risultato determinante, Membri falliti, a single check or the Worst Load Combination.
2. GOVERNARE: il rapporto più alto e il suo membro.
3. A toolbar to filter the members (Tutto, Failed, Passato o Avvertimento aste, or the members of a section), reset the sorting, copy the table, download it as CSV, download all the member reports as HTML, e aprire il Sommario parametri in SkyCiv Load Generator.
4. La Rapporti di progettazione dei membri tavolo, con a Stato (Passaggio, Warn o Fallire) and the report icon of each member. Passa il mouse sopra l'icona ℹ nell'intestazione di una colonna per vedere la clausola a cui fa riferimento.
5. The 3D view, where each member is coloured Fallire, Avvertimento o Passaggio and labelled with its governing ratio and check.

Colonna	Dai un'occhiata	Clausola
P	Axial force, tensione o compressione	6.2.3 o 6.2.4
Mz	Bending about the major axis	6.2.5
My	Bending about the minor axis	6.2.5
V y, V z	cesoia	6.2.6
C	Azioni combinate, resistance of cross-sections	6.2.1
CB	Combined bending and axial compression, buckling resistance of members	6.3.3
Bc	Buckling resistance of compression members	6.3.1
Bb	Lateral-torsional buckling resistance	6.3.2
T	Torsione (basic stress check), NR when it is not performed	6.2.7
Sl	Governing slenderness λ of the member (not a ratio)
D	Span/deflection of the member (not a ratio)
LC	Load combination of the governing result

A member fails when one of its strength ratios is above 1.0. The slenderness and deflection checks are not part of the governing ratio: when the slenderness exceeds its limit, or the span/deflection is below Def_L, il Sl o D value is highlighted and the member status is Warn. Their ratios to the limits are shown on the 3D model (per esempio 0.797 Sl) e nel Sommario parametri in SkyCiv Load Generator.

Rapporti

Click the report icon of a member to open its design report, in un Rapporto di progettazione per il membro n dialogare con Vicino, Apri in una nuova scheda, ScaricaHTML e Scarica PDF. The report shows the references (clauses), the calculations and the result (STATUS PASS o FALLIRE) of each check:

• Dettagli del progetto e General member design information: the section, its shape and fabrication (hot-rolled or welded), the material properties and the design parameters
• Design Internal Forces: the governing forces used for each check
• The checks of axial strength (tensione o compressione), axial buckling strength, flexural strength about the major and minor axes, lateral-torsional buckling resistance, interaction of combined resistance, interaction of combined buckling, shear strength along y and z and, when performed, torsione
• Controllo della flessione: the critical serviceability load combination and position, the span, the maximum deflection and the ratio to the limit

Each check gives the load combination and station that govern it, and the section classification table for that limit state: the class of each element (ragnatela, flange) for the axial force and for bending about each axis, with the governing class highlighted. For a Class 4 sezione, the effective properties are used. When the shear force is high (6.2.8), the reduced yield strength is used for the resistances.

The lateral-torsional buckling check is calculated for the segment where the governing station is, with its L_cr e C₁. When C₁ è auto, it is calculated from the moments along the segment with the formula proposed by Serna et al. (2006). The report then gives M_cr, the non-dimensional slenderness, the buckling curve and the reduction factor χ_{Verifica dell'ACI}.

The deflection check is performed when the model has serviceability load combinations and Def_L è più grande di 0. Otherwise the report says that the deflection check was skipped.

Clic Sommario on the Results tab to open the summary report. Elenca i dettagli del progetto (codice di progettazione, user name and unit system), the design factors, i materiali, the section dimensions and properties, the properties of each member (buckling lengths, L_cr, C₁, C_m factors and limits), the results of all the members and the definitions of the symbols.

Controlli eseguiti

Here are the details of some of the checks performed by the module.

Slenderness Ratio Check

Each member is checked against the slenderness limits entered in the Membri tab: SR_C for members in compression (200 per impostazione predefinita) e SR_T for members in tension or without axial force (300 per impostazione predefinita). The slenderness is calculated about both axes from the effective length and the radius of gyration about the same axis:

• λ_z = K_zL_z / io_z about the major axis, with i_z = √(I_z / A)
• λ_y = K_yL_y / io_y about the minor axis, with i_y = √(I_y / A)

The governing slenderness λ = max(λ_z, λ_y) is divided by the limit, and the member passes when this ratio is 1.0 o meno. The slenderness check is listed in the Sl column of the Results tab.

To show this check in the detailed report of each member, open the settings (the gear button next to Dai un'occhiata) and tick Show slenderness check in the report. It’s off by default.

The report then has a Check Slenderness Ratio section after the buckling check, with the radii of gyration, the slenderness about each axis, the governing slenderness and its ratio to the compression and/or tension limit, with a PASS or FAIL status.