IDEA StatiCa tutorial – Fire resistance

In this tutorial, we will go step by step in modeling and code-checking of across - section of a single span beam. This tutorial is focused on the fire resistance of a single span beam. For users is also attached the file Fire resistance_complete where are checks for all structure types as column, slab and wall.

1 New project

We start a New project in IDEA StatiCa RCS and select theFunctionality - Fire resistance EN 1992-1-2:2006-11

 

2 Geometry

We select a T - section and fill out the dimensions.

 

3 Design

We define the exposure class as XC3 and XD1.

 

In the tab Fire resistance, we leave the default settings of the Resistance R30 of the cross - section. As the second step, we define the Fire effect from 3 sides. If the load - bearing function (Criterium R) is required, only the necessary slab thickness assumed for design according to EN 1992-1-1 may be taken. The Floor thickness 0.1 mfor the purpose of this example does not affect the bearing function of the T-section.

 

We fill out the Internal forces for ULS and Fire resistance combination. The forces in fire resistance must be filled out manually. For a conservative check the ULS internal forces can be multiplied by the coefficient 0.7, and we receive the design internal forces for Fire resistance. This procedure is performed in this tutorial, too.

 

We use for the input of the reinforcement a predefined template of reinforcement.Diameters for longitudinal bars and stirrups should be filled out according to table bellow.

 

In the Calculation control tab we tick the checks which are relevant for ULS and Fire resistance.

 

4 Design

In the Results tab we can control if all checks are fulfilled.

The fire resistance approach is based on the Tabulated data check.It means that all calculated values are compared with the limit values determined in the code. For beam sections these are the width of the web and the distance of the outer layer of reinforcement from the nearest surface exposed to fire.

 

In the Project Summary navigator and Sections tab is really important to set Position location. By default the Simple - spanis set. If we check a continuous beam, we ought to set the location of the section on the beam. It has a significant impact on the check of the fire resistance according to tabulated data.

 

5 Report

All previous data with results are outlined in the customizable Report. This document can be exported to PDF or MS Word.

We have designed, optimized and code - checked a reinforced T-section for ULS and fire resistance according to Eurocode.

 

Keywords:

Concrete, reinforcement, cross-section, templates, exposure class, fire resistance combination, ULS combination, design, Eurocode, RCS, N-M-M, shear, beam, slab, wall, column, tabulated data, fire effect, floor thickness, report

 

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Release notes Concrete & Prestressing version 10.1