Masonry Design

Last modified by Iwona Budny Bjergø on 2021/01/29 16:39

With FEM-Design Masonry design module, masonry walls (made of newly developed brick materials) can be modeled and checked according to EN1996-1-1.

Content

Modeling requirements

A masonry wall should be defined with the Plane wall command and should have brick-type material.

  • Brick material definition is available for Plane wall objects only.
  • The effect of mortar on design can be considered in two ways:
    1. In case of "masonry unit (brick) only"-type Brick library materials Mortar strength, Constants according to EN1996-1-1 (3.1-3.4) and calculation method of Modulus of elasticity can be set in Application data dialog.
    2. In case of "masonry (brick + mortar)"-type Brick library  material no extra settings are required from Application data dialog.

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Configuration and calculation parameter

Masonry design calculation is carried by vertical Wall stripes. The stripes help to accurately account for the openings, the load / support / slab-connection conditions of a wall, which may vary along the length. The stripe-division is performed automatically based on the Default (maximum) stripe width parameter that we specify at Configure masonry design.

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  • The recommended maximum stripe size is 1-2 meters.
  • FEM-Design generates stripes of the same width for wall parts without openings.
  • By default, FEM-Design does not take into account the wall parts (and so the stripes) below and above the openings, it sets them as "Not relevant" to the design. These parts are marked with a black cross.
  • A stripe can only be a quadrilateral (most often a rectangle) or a triangle depending on Wall geometry.

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Stripes can be modified one-by-one manually with the tools of Calculation parameter: Split stripe, Move border and Merge stripes (to one):

In Properties dialog the following options and data can be set

  • By Not relevant it can be set whether or not ("Not relevant") a particular stripe is taken into account in design
  • Slab-wall connection (hinged or rigid) influences moment distribution by eccentricity between a slab and the wall part.
  • Layout defines how a slab is positioned above/below the wall part.
    • d1, d2 are needed to calculate the free height of the wall part.
    • s1, s2 are needed to calculate the moment due to slab eccentricity.
  • Modified stripes can be restored to the state and size recommended by FEM-Design (from the automatic generation and the Default (maximum) stripe width parameter) with the Reset wall stripes command at any time.

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Results

The Masonry Wall design provides the following results for Load combinations or Load groups:

  • Internal forces by stripe
    • Normal force
    • Moment from analysis
    • Moment due to eccentricity derived from slab-wall connection
    • Total moment
  • Utilization

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Detailed result is available by walls

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The content of a detailed result can be managed by Display options.

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We can create tables (in our FEM-Design documentations) or export lists of brick materials and Masonry design results.

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Parent topic: User Manual

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Created by Iwona Budny Bjergø on 2020/11/17 08:43
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