{"id":5200,"date":"2019-03-14T15:49:30","date_gmt":"2019-03-14T14:49:30","guid":{"rendered":"http:\/\/www.vernicifirewall.it\/le-strutture-portanti\/"},"modified":"2019-04-16T14:13:33","modified_gmt":"2019-04-16T12:13:33","slug":"le-strutture-portanti","status":"publish","type":"page","link":"https:\/\/www.vernicifirewall.it\/en\/le-strutture-portanti\/","title":{"rendered":"Load-bearing structures"},"content":{"rendered":"
[mk_page_section bg_image=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/background-vernici.jpg” bg_image_portrait=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/background-vernici_mobile-1.jpg” bg_position=”left center” bg_repeat=”no-repeat” bg_stretch=”true” enable_3d=”true” padding_top=”0″ padding_bottom=”0″ sidebar=”sidebar-1″][vc_column]
<\/div>[vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text el_class=”red rennertitle” css=”.vc_custom_1554733883747{margin-bottom: 0px !important;}”]The load-bearing
\nstructures[\/vc_column_text][vc_column_text el_class=”black rennerp” css=”.vc_custom_1554733904520{margin-bottom: 0px !important;}”]Wood is a combustible material, but also a bad heat-conductor. That\u2019s why it is used for the creation of load-bearing structures not only because it is aesthetically fascinating and cheap, but also, above all, because in case of fire it has a great mechanical resistance, that can be useful to increase the necessary time, in order to rescue all the people inside the room.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text el_class=”red rennersubtitle” css=”.vc_custom_1554733912421{margin-bottom: 0px !important;}”]STEEL-CONCRETE[\/vc_column_text][vc_column_text el_class=”black rennerp” css=”.vc_custom_1554733921127{margin-bottom: 0px !important;}”]The temperature increase reduces the material mechanical features, but leaves unchanged the geometry of the section[\/vc_column_text][mk_image src=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/04\/disegno_1_en.png” image_size=”full”][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_column_text el_class=”red rennersubtitle” css=”.vc_custom_1554733977959{margin-bottom: 0px !important;}”]WOOD[\/vc_column_text][vc_column_text el_class=”black rennerp” css=”.vc_custom_1555416790839{margin-bottom: 0px !important;}”]The temperature increase leaves (almost) unchanged the material mechanical features, but reduces the geometry of the section[\/vc_column_text][mk_image src=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/04\/disegno_2_en.png” image_size=”full”][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner][vc_column_text el_class=”black rennerp” css=”.vc_custom_1554734003497{margin-bottom: 0px !important;}”]The chart shows the trend of the two components, wood and steel\/concrete in front of a potential fire.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner]
<\/div>[\/vc_column][\/mk_page_section][mk_page_section bg_image=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/wood.jpg” bg_position=”right center” bg_repeat=”no-repeat” bg_stretch=”true” enable_3d=”true” padding_top=”0″ padding_bottom=”0″ sidebar=”sidebar-1″][vc_column width=”1\/2″][\/vc_column][vc_column width=”1\/2″]
<\/div>[vc_column_text el_class=”white rennertitle” css=”.vc_custom_1554734012005{margin-bottom: 0px !important;}”]WOOD[\/vc_column_text][vc_column_text el_class=”white rennerp” css=”.vc_custom_1554734020840{margin-bottom: 0px !important;}”]The fire penetrates with an average speed of 0,7-0,9 mm\/minute, creating a burned carbonic layer, that limits the flame development. The temperature, inside the wooden beam of only few centimetres, is only 40\u00b0C against 1000\u00b0C outside. The fire and the heat don\u2019t change the mechanical resistance. The collapse occurs when the combustion reduces the geometry of the left cross section, so that it can be no more a load-bearing structure. The duration is proportional to its own thickness, so that it is possible to support high loads and resistances only with an oversized beam, without a treatment with fire-retardant or intumescent coatings, plasters or silicon calcium slabs.[\/vc_column_text]
<\/div>[\/vc_column][\/mk_page_section][mk_page_section bg_image=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/steel.jpg” bg_position=”left center” bg_repeat=”no-repeat” bg_stretch=”true” enable_3d=”true” padding_top=”0″ padding_bottom=”0″ sidebar=”sidebar-1″][vc_column width=”1\/2″]
<\/div>[vc_column_text el_class=”white rennertitle” css=”.vc_custom_1554734030397{margin-bottom: 0px !important;}”]STEEL[\/vc_column_text][vc_column_text el_class=”white rennerp” css=”.vc_custom_1555416808863{margin-bottom: 0px !important;}”]Steel is considered as an incombustible material and this is true, but steel is also a good heat conductor. If submitted to a drastic increase of temperature, as in case of fire, the steel loses its stability.
\nAfter only 5 minutes of exposure to fire, the steel reaches more or less 500\u00b0C. This represents the critical temperature for this material. After 10 minutes of fire the steel construction becomes enervated and collapses on itself like a house of cards. Steel expands about 0,012 mm per every meter of length and temperature degree. In case of a temperature of 500\u00b0C, that means a lengthening of 6mm per meter. It is compulsory the use of intumescent coatings or other types of protection.[\/vc_column_text]
<\/div>[\/vc_column][vc_column width=”1\/2″][\/vc_column][\/mk_page_section][mk_page_section bg_image=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/cemento.jpg” bg_position=”right center” bg_repeat=”no-repeat” bg_stretch=”true” enable_3d=”true” padding_top=”0″ padding_bottom=”0″ sidebar=”sidebar-1″][vc_column width=”1\/2″][\/vc_column][vc_column width=”1\/2″]
<\/div>[vc_column_text el_class=”white rennertitle” css=”.vc_custom_1554734052238{margin-bottom: 0px !important;}”]CONCRETE[\/vc_column_text][vc_column_text el_class=”white rennerp” css=”.vc_custom_1554734063126{margin-bottom: 0px !important;}”]Because of its composition, also reinforced concrete or concrete is classified as a not combustible building material. The capacity to be a heat conductor of concrete is 2,1 W\/mK, against 60 W\/mK of steel; this is an important factor to be considered, when there are components such as reinforced concrete and, in particular, pre-cast concrete.
\nThe calcareous aggregates don\u2019t lose in mechanical resistance, if not above 750\u00b0C, when the heat decay of limestone in lime and carbon dioxide starts.
\nThe problem is the inner content of steel and the main role is the heat protection of concrete cover. In fact, in structures with reinforced concrete, the high temperature has a relevant importance towards steel, that above 500\u00b0C loses the major part of its features.
\nThese weaknesses become \u201cfast tracks\u201d for the heat flow, provoking a localised temperature increase, that can exceed 500\u00b0C in a very short time. Even in this case the fire trend is similar to a steel beam, that\u2019s why it is compulsory the use of intumescent coatings or other types of protection.[\/vc_column_text]
<\/div>[\/vc_column][\/mk_page_section]\n<\/div>","protected":false},"excerpt":{"rendered":"

[mk_page_section bg_image=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/background-vernici.jpg” bg_image_portrait=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/background-vernici_mobile-1.jpg” bg_position=”left center” bg_repeat=”no-repeat” bg_stretch=”true” enable_3d=”true” padding_top=”0″ padding_bottom=”0″ sidebar=”sidebar-1″][vc_column][vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text el_class=”red rennertitle” css=”.vc_custom_1554733883747{margin-bottom: 0px !important;}”]The load-bearing structures[\/vc_column_text][vc_column_text el_class=”black rennerp” css=”.vc_custom_1554733904520{margin-bottom: 0px !important;}”]Wood is a combustible material, but also a bad heat-conductor. That\u2019s why it is used for the creation of load-bearing structures not only because it is aesthetically fascinating and cheap, but also, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5200","page","type-page","status-publish","hentry"],"yoast_head":"\nLoad-bearing structures - Le vernici ignifughe per il legno Firewall<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vernicifirewall.it\/en\/le-strutture-portanti\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Load-bearing structures - Le vernici ignifughe per il legno Firewall\" \/>\n<meta property=\"og:description\" content=\"[mk_page_section bg_image=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/background-vernici.jpg” bg_image_portrait=”http:\/\/www.vernicifirewall.it\/wp-content\/uploads\/2019\/03\/background-vernici_mobile-1.jpg” bg_position=”left center” bg_repeat=”no-repeat” bg_stretch=”true” enable_3d=”true” padding_top=”0″ padding_bottom=”0″ sidebar=”sidebar-1″][vc_column][vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text el_class=”red rennertitle” css=”.vc_custom_1554733883747{margin-bottom: 0px !important;}”]The load-bearing structures[\/vc_column_text][vc_column_text el_class=”black rennerp” css=”.vc_custom_1554733904520{margin-bottom: 0px !important;}”]Wood is a combustible material, but also a bad heat-conductor. 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