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Hipped roof - Wind load graph - top view
- Output document
Wind and Snow Loads
The LWS+ programme calculates the wind and snow loads for the double-pitch roof, hip roof and single-pitch roof. In addition, for flat roofs, eaves can be taken into account that are either sharp-edged, bevelled, rounded or have a parapet. Furthermore, snow drifts on superstructures, sliding snow loads from abutting taller structures, canopies, the internal wind pressure in closed buildings and the wind action on free-standing walls can be recorded.
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SHOW MOREStructural system
- Double-pitch roof
- Hip roof
- Single-pitch roof
- Flat roof with sharp-edged, bevelled, or rounded eaves or parapet
In addition:
- Snow drifts on superstructures
- Loads by down-sliding snow from abutting taller structures
- Canopies
- Wind-induced internal pressure in closed buildings
- Wind action on free-standing walls
Calculation
- Wind loads
- Roof snow loads
The software calculates the site-specific basic wind velocity pressure qb and the gust velocity pressure q(z) on walls and roof surfaces with consideration of the defined geographic border conditions.
The aerodynamic coefficients and the resulting wind loads are calculated for areas = 10 m², for areas < 1 m² (uplift) and, optionally, for areas between 1 and 10 m² for upwind angles of 0°, 90°, 180° and 270°. For areas with alternating pressure and suction loads, always both values are put out.
The wind loads are calculated exclusively in accordance with the wind pressure coefficient method.
The software allows you to determine the ground snow loads and the resulting roof snow loads as well as the snow loads on the eaves at roof overhangs.
Document file formats
- Word
- Printer
Output
- Standard
- Brief
- Detailed
- User defined
The aerodynamic coefficients and the wind loads can be put out graphically and, optionally, in the form of tables.
Standards
- EN 1991
- DIN EN 1991
- ÖNORM EN 1991
- BS EN 1991
- NTC EN 1991
- PN EN 1991
Support resources
News
ALLPLAN is releasing powerful updates for structural analysis and design with FRILO 2025
Highlights include a direct interface to ALLPLAN for more efficient reinforcement of concrete columns, the new PLUS program SLS+ for the design of splice connections, and the option of designing transverse joints to timber beams with the HO12+.
Merger of FRILO Software and DC Software with ALLPLAN successfully completed
The merger of FRILO Software GmbH and DC-Software Doster & Christmann GmbH with the ALLPLAN Group has been legally completed since July 1, 2024.
Events
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