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Alex Bacon, EIT
2024-10-22

KB 001906 | Balanced and Unbalanced Snow Loads for Curved Roofs in RFEM 6 According to ASCE 7-22

KB|001906

ASCE 7-22 requires both balanced and unbalanced snow load scenarios for curved roof design. The slope of the arch roof is determined using the equation of a circle, and the snow load magnitude is calculated based on the roof slope factor and exposure factor. The Geo-Zone Tool provides efficient access to ground snow load data based on ASCE 7-22.

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Excel Data Imported into RFEM for Variable Member Load
The ASCE 7-22 standard requires both balanced and unbalanced snow load case scenarios for a structure's design consideration. While this may be more intuitive for flat or even gable/hip type roofs, the determination of snow loads is increasingly difficult for arch roofs due to complex geometry. However, with guidance from ASCE 7-22 on snow load calculations for curved roofs and RFEM's efficient load application tools, it is possible to consider both balanced and unbalanced snow loads for a reliable and safe structure design.
KB 001884 | AISC Chapter F Lateral Torsional Buckling Versus Eigenvalue Calculation Methods Compared in RFEM 6
Utilizing the Steel Design Add-on, steel design is possible according to the AISC 360-22 standard. The following article will compare the result output when calculating lateral torsional buckling according to Chapter F vs. an Eigenvalue Analysis.
KB 001885 | Assessment of Story Drift Under Seismic Loads According to ASCE 7-22 and Building Model
The evaluation of story drift in a building is crucial to ensure acceptable structural performance by limiting the drift amount. Excessive drift has the potential to induce system instability and may cause damage to nonstructural components such as partitions. This article outlines the procedure for establishing interstory drift according to ASCE 7-22 and the Building Model add-on in RFEM 6.
KB 001877 | ASCE 7-22 and NBC 2020 Seismic P-Delta Considerations in RFEM 6
The ASCE 7-22 Standard [1], Sect. 12.9.1.6 specifies when P-delta effects should be considered when running a modal response spectrum analysis for seismic design. In the NBC 2020 [2], Sent. 4.1.8.3.8.c gives only a short requirement that sway effects due to the interaction of gravity loads with the deformed structure should be considered. Therefore, there may be situations where second-order effects, also known as P-delta, must be considered when carrying out a seismic analysis.
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Product Features
Feature 002013 | Generation of Wind Loads

Wind loads are also not a problem in your design. You can automatically generate wind loads as member loads or area loads (RFEM) on the following structural components:

  • Vertical walls
  • Flat roofs
  • Monopitch roofs
  • Duopitch/troughed roofs
  • Vertical walls with duopitch roof
  • Vertical walls with flat/monopitch roof

The following standards are available to you:

  • European Union | Flag EN 1991-1-3 (incl. National Annexes)
  • EN-US | Flag ASCE 7
  • Canada | Flag NBC
  • Spain Flag CTE DB-SE-AE
  • South Africa Flag SANS 10160
  • People's Republic of China | Flag GB 50009
Feature 002012 | Generation of Snow Loads

Do your structures also have to withstand snowfall? Use the Snow Load Wizard to generate snow loads as member loads or surface loads.

The following standards are available:

  • European Union | Flag EN 1991-1-3 (incl. National Annexes)
  • EN-US | Flag ASCE 7
  • Canada | Flag NBC
  • Switzerland | Flag SIA 261
  • Spain Flag CTE DB-SE-AE
  • People's Republic of China | Flag GB 50009
  • India | Flag IS 875
Snow Load Wizard with options for snow overhang and snow guard according to Eurocode.

In the Snow Load Wizard, you can optionally consider snow overhang and snow guard when generating snow loads according to Eurocode.

Die Bauzustandsanalyse ermöglicht die Anpassung von Eigenschaften wie Stäben und Flächen in verschiedenen Bauphasen.

The Construction Stages Analysis (CSA) add-on allows you to modify the object and design properties of members, surfaces, and so on, in the individual construction stages.

Frequently Asked Questions (FAQ)
How can I design my structure according to ASD strength design (such as AISC, ADM, NDS, and so on)?
My ASCE 7 generated seismic load combinations combine the X and Y directions in the same CO. How do I change this to independent directions only?
How do I include the overstrength factor(s) Ωo in the ASCE 7 load combinations?
My live load is less than or equal to 100 psf. How do I consider the reduced load factor in the ASCE 7 load combinations?
How do I include the redundancy factor(s) ρ in the ASCE 7 load combinations?
I do not see the seismic load cases in my generated ASCE 7 load combinations (COs). How do I add them?
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