Software pentru analiză și proiectare structurală | LIRA-FEM

Eurocodes (EN)

Eurocode 1. Actions on structures

In LIRA-FEM (LIRA-SAPR), it is possible to automatically define the snow and wind loads according to the Eurocode:

SP RK EN 1991-1-3:2004/2011 - Action on building structures. Part 1-3. General actions. Snow loads
EN 1991-1-4:2005 - Action on building structures. Part 1-4. General actions. Wind actions
SP RK EN 1991-1-4:2005/2011 - Action on building structures. Part 1-4. General actions. Wind actions

To analyse a structure, loads should be applied to the design model. Either concentrated or distributed loads may be applied to the final elements of the design model. The values of the applied loads are defined by the engineer according to the design specification or certain regulatory documents. In some cases, the values of these loads are not defined directly in the normative documentation but are derived values that depend on many parameters (climatic region, ratio of structure dimensions, height of load application, cargo area, etc.). The LIRA-FEM program offers a number of helpful tools that can be used to specify such loads in accordance with Eurocode 1 and to simplify the analysis process.

1. Wind actions according to EN 1991-1-4:2005, NP 2.2.1 to SP RK EN 1991-1-4:2005/2011, NP RK EN 1991-1-4:2005/2011 (NTP RK 01-01-3.1(4.1)-2017)

Wind load parameters

In the LIRA-CAD (SAPFIR) module of the LIRA-FEM, it is possible to collect the wind loads according to certain regulatory standards. The load is determined according to the wind region, type of site, and specified coefficients. The non-uniform distribution of load over the height of the structure is taken into account.

List of Eurocode items implemented in LIRA-FEM (LIRA-CAD module)

NP to SP RK EN 1991-1-4:2005/2017 (NTP RK 01-01-3.1 (4.1)-2017)
EN 1991-1-4:2005

Chapter I. Part 1-3. Snow loads

Section 5 [5]. Snow loads on roofs:

5.2. Load arrangements

Section 6 [6]. Local effects:

6.2 [6.2]. Drifting at projections and obstructions

Chapter I. Part 1-4. Wind actions

Section 4: Wind velocity and velocity pressure:

4.1 [4.1] Basis for calculation, 4.2 [4.2] Basic values, 4.3 [4.3] Mean wind, P.4.3.1 [4.3.1] Variation with height, Table 4.1 [4.1] Terrain categories and terrain parameters, 4.5 [4.5] Peak velocity pressure

Section 5[5]. Wind actions:

5.1 [5.1] General, 5.2 [5.2] Wind pressure on surfaces, 5.3 [5.3] Wind forces

Section 6. Structural factor CsCd:

6.1 [6.1]. General, 6.2 [6.2] Determination of CsCd

Section 7. Pressure and force coefficients:

7.1 [7.1] General, 7.1.2 [7.1.2] Asymmetric and counteracting pressures and forces, 7.2 Pressure coefficients for buildings, 7.7.2.2.2 [7.2.2] Vertical walls of rectangular plan buildings, 7.2.3 [7.2.3] Flat roofs, 7.2.4 [7.2.4] Monopitch roofs, 7.2.5 [7.2.5] Duopitch roofs

Part 1-4: General actions - Wind actions

Section 4. Wind velocity and velocity pressure:

4.1 [4.1] Basis for calculation, 4.2 [4.2] Basic values, 4.3 [4.3] Mean wind, 4.3.1 Variation with height, 4.3.2. Terrain roughness, Table 4.1. Terrain category and terrain parameters, 4.5 Peak velocity pressure

Section 5. Wind actions:

5.1 General, 5.2 Wind pressure on surfaces

Section 6. Structural factor CsCd:

6.1 General, 6.2 Determination of CsCd

Section 7. Pressure and force coefficients:

7.1 General, 7.2 Pressure coefficients for buildings, 7.2.2 Vertical walls of rectangular plan buildings

List of Eurocodes

Eurocode 1. Actions on structures

1. Wind actions according to EN 1991-1-4:2005, NP 2.2.1 to SP RK EN 1991-1-4:2005/2011, NP RK EN 1991-1-4:2005/2011 (NTP RK 01-01-3.1(4.1)-2017)

There are several ways to apply wind loads:

2. Snow mound according to NP 2.2.1 to SP RK EN 1991-1-4:2005/2017, NP to SP RK EN 1991-1-3:2005/2017

3. Collecting the loads on bars

List of Eurocode items implemented in LIRA-FEM (LIRA-CAD module)

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