Materijali za zaštitu od požara čeličnih konstrukcija

undergraduate thesis

• Title (english): Materials for fire protection of steel structural elements
• Author: Martina Kozlik
• Mentor: Marija Jelčić Rukavina (mentor)
• Committee member: Ana Baričević (predsjednik povjerenstva)
• Committee member: Ivan Gabrijel (član povjerenstva)
• Committee member: Marija Jelčić Rukavina (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Materials); Zagreb
• Defense date and country: 2019-09-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract

Ponašanje čelika pri visokim požarnim temperaturama predstavlja bitnu stavku pri projektiranju čeličnih konstrukcija. Iako je čelik negoriv materijal, mehanička svojstva znatno opadaju s porastom temperature, a posebno ako se dosegnu kritične vrijednosti iste. Stoga je potrebno osigurati potrebnu zaštitu čeličnih elemenata od požara, koja se može postići različitim oblogama kao što su premazi, boje, toplinsko- izolacijski materijali, sustavi ploča, betonske obloge, itd. Tako se smanjuje porast temperature u čeličnim elementima ispod kritične vrijednosti. U ovom radu provedena je analiza razvoja temperature kroz presjek čeličnog profila tipa HE180B bez zaštite i sa zaštitom. Materijali korišteni za zaštitu su: kalcij-silikatne ploče, cementna žbuka i betonska obloga, a svaki od njih je dodatno analiziran s tri različite debljine. Požar je definiran standardnom krivuljom požara ISO 834 u trajanju od 120 minuta. Analiza je provedena koristeći dvodimenzionalni model za izračun razvoja temperatura, TasefPlus. Dobiveni rezultati pokazuju da je minimalna potrebna debljina za sprečavanje porasta kritične temperature u čeličnom profilu od 550°C za kalcij-silikatnu ploču iznosi 30 mm, za betonsku oblogu 50 mm, a za cementnu žbuku 45 mm.

Abstract (english)

The behaviour of steel at high fire temperatures is an essential element in the design of steel structures. Although steel is a non-combustible material, its mechanical properties decrease significantly with temperature, especially if critical values are reached. Therefore, it is necessary to provide the necessary protection of the steel elements against fire, which can be achieved by various materials such as coatings, paints, thermal insulation materials, board systems, concrete coatings, etc. In this way, the temperature rise in the steel elements is reduced below a critical value. In this work, an analysis of the temperature development through the cross section of a steel profile of type HE180B without protection and with protection is carried out. The materials used for protection are calcium-silicate boards, cement-based plaster and concrete boards, each of which was further analysed with three different thicknesses. The fire is defined by the standard ISO 834 fire curve for 120 minutes. The analysis was performed using a two-dimensional model to calculate the development of temperatures, TasefPlus. The obtained results showed that the minimum thickness required to prevent the critical temperature rise in steel profile below the 550 ° C for the calcium silicate plate was 30 mm, for the concrete board 50 mm, and for the cement-based plaster 45 mm.

• Keywords: čelični elementi; požar; kritična temperatura; zaštita elemenata; analiza čeličnog profila
• Keywords (english): steel elements; fire; critical temperature; element protection; analysis of steel cross section
• Language: croatian
• URN:NBN: urn:nbn:hr:237:799279
• Study programme: Title: Civil Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka građevinarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka građevinarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-11-25 12:12:04