Fire resistance of reinforced concrete tubings of underground structures with polypropylene fiber

V. I. Golovanov, A. V. Pekhotikov, N. S. Novikov, V. V. Pavlov, E. V. Kuznetsova
2019 ПОЖАРОВЗРЫВОБЕЗОПАСНОСТЬ  
Âñåðîññèéñêèé íàó÷íî-èññëåäîâàòåëüñêèé èíñòèòóò ïðîòèâîïîaeàðíîé îáîðîíû Ì×Ñ Ðîññèè (Ðîññèÿ, 143903, ã. Áàëàøèõà Ìîñêîâñêîé îáë., ìêð. ÂÍÈÈÏÎ, 12) ÐÅÇÞÌÅ Ââåäåíèå. AEåëåçîáåòîííûå êîíñòðóêöèè èç òÿaeåëîãî áåòîíà ïîâûøåííîé âëàaeíîñòè (áîëåå 3,5 %) èìåþò ñêëîííîñòü ê âçðûâîîáðàçíîìó ðàçðóøåíèþ, êîòîðîå ìîaeåò ïðèâåñòè ê ïðåaeäåâðåìåííîìó íàñòóïëåíèþ ïðåäåëà îãíåñòîéêîñòè òàêèõ êîíñòðóêöèé è ÷àñòè÷íîìó èëè ïîëíîìó îáðóøåíèþ çäàíèé è ñîîðóaeåíèé. Ïîâûøåííàÿ âëàaeíîñòü aeåëåçîáåòîííûõ êîíñòðóêöèé
more » ... îííûõ êîíñòðóêöèé îáû÷íî âñòðå÷àåòñÿ â ïîäçåìíûõ ñîîðóaeåíèÿõ è âî âíîâü âîçâîäèìûõ çäàíèÿõ. Îãíåñòîéêîñòü aeåëåçîáåòîííûõ òþáèíãîâ ïîäçåìíûõ ñîîðóaeåíèé â çíà÷èòåëüíîé ñòåïåíè çàâèñèò îò âçðûâîîáðàçíîãî (õðóïêîãî) ðàçðóøåíèÿ áåòîíà ïðè âîçäåéñòâèè âûñîêèõ òåìïåðàòóð ïîaeàðà íà ïîâåðõíîñòü îáäåëêè òîííåëÿ. Ìàòåðèàëû è ìåòîäû.  êà÷åñòâå îáúåêòà èññëåäîâàíèÿ áûëè âûáðàíû aeåëåçîáåòîííûå òþáèíãè èç òÿaeåëîãî áåòîíà âëàaeíîñòüþ 6 % ñ äîáàâêîé ïîëèïðîïèëåíîâîé ôèáðû â êîëè÷åñòâå 1 êã/ì 3 . Ïðîâåäåíû êðóïíîìàñøòàáíûå îãíåâûå èñïûòàíèÿ íà ñïåöèàëüíî èçãîòîâëåííîì ñòåíäå ïðè íàãðóaeåíèè îáðàçöîâ âåðòèêàëüíîé è ãîðèçîíòàëüíîé íàãðóçêîé. Ðåçóëüòàòû è îáñóaeäåíèå. Ïðåäñòàâëåíû îñíîâíûå ðåçóëüòàòû ýêñïåðèìåíòàëüíîãî èññëåäîâàíèÿ îãíåñòîéêîñòè aeåëåçîáåòîííûõ òþáèíãîâ ñ äîáàâêîé ïîëèïðîïèëåíîâîé ôèáðû è áåç íåå. Ïî ðåçóëüòàòàì óñòàíîâëåíî, ÷òî ïðåäåë îãíåñòîéêîñòè aeåëåçîáåòîííîãî òþáèíãà ñ äîáàâêîé ïîëèïðîïèëåíîâîé ôèáðû ñîãëàñíî ÃÎÑÒ 30247.0-94 ñîñòàâèë íå ìåíåå 125 ìèí (REI 120). Ðàçðàáîòàíà àíàëèòè÷åñêàÿ ìîäåëü îöåíêè îãíåñòîéêîñòè. Äëÿ ðåøåíèÿ òåïëîòåõíè÷åñêîé çàäà÷è ïðîâåäåí ÷èñëåííûé ýêñïåðèìåíò ñ ïîìîùüþ ïðîãðàììíîãî êîìïëåêñà "ANSYS". Ïðåäëîaeåíà àíàëèòè÷åñêàÿ çàâèñèìîñòü îïðåäåëåíèÿ äîïîëíèòåëüíîãî òåìïåðàòóðíîãî ïðîãèáà äëÿ ãåîìåòðè÷åñêè íåëèíåéíîãî ýëåìåíòà. Ðàñ÷åò ïðåäåëà îãíåñòîéêîñòè aeåëåçîáåòîííîãî òþáèíãà ñ äîáàâêîé ïîëèïðîïèëåíîâîé ôèáðû ïî ðàçðàáîòàííîé àíàëèòè÷åñêîé ìîäåëè ñ ó÷åòîì ðàíåå ïîëó÷åííûõ ïðî÷íîñòíûõ è òåïëîòåõíè÷åñêèõ õàðàêòåðèñòèê ïîäòâåðäèë ðåçóëüòàòû îãíåâûõ èñïûòàíèé: ïðåäåë îãíåñòîéêîñòè ñîñòàâèë REI 120. Çàêëþ÷åíèå. Èñïîëüçîâàíèå äëÿ îãðàaeäàþùèõ êîíñòðóêöèé òîííåëÿ aeåëåçîáåòîííûõ òþáèíãîâ èç ôèáðîáåòîíà ñ ïîëèïðîïèëåíîâîé ôèáðîé ïîçâîëèò çíà÷èòåëüíî ñíèçèòü çàòðàòû íà óñòðîéñòâî îãíåçàùèòû è ñîêðàòèòü ñðîêè ñòðîèòåëüñòâà. Êëþ÷åâûå ñëîâà: ñòàíäàðòíûé òåìïåðàòóðíûé ðåaeèì ïîaeàðà; òåïëîòåõíè÷åñêàÿ çàäà÷à; ñòàòè÷åñêàÿ (ïðî÷íîñòíàÿ) çàäà÷à; âçðûâîîáðàçíîå (õðóïêîå) ðàçðóøåíèå áåòîíà; îáäåëêà òîííåëÿ. Äëÿ öèòèðîâàíèÿ: Ãîëîâàíîâ Â. È., Ïåõîòèêîâ À. Â., Íîâèêîâ Í. Ñ., Ïàâëîâ Â. Â., Êóçíåöîâà Å. Â. Îãíåñòîéêîñòü aeåëåçîáåòîííûõ òþáèíãîâ ïîäçåìíûõ ñîîðóaeåíèé ñ ïîëèïðîïèëåíîâîé ôèáðîé // Ïîaeàðîâçðûâîáåçîïàñíîñòü/Fire and Explosion Safety. -2019. -Ò. 28, ¹ 5. -Ñ. 60-70. ABSTRACT Introduction. Reinforced concrete structures made of heavy concrete of high humidity (more than 3.5 %) are prone to explosive destruction. This phenomenon can lead to premature onset of the fire resistance of such structures and the partial or complete collapse of buildings and structures. The increased humidity of reinforced concrete structures is usually found in underground structures and newly constructed buildings. The fire resistance of reinforced concrete tubes of underground structures largely depends on the explosive (brittle) destruction of concrete when exposed to high temperatures of fire on the surface of the tunnel lining.
doi:10.18322/pvb.2019.28.05.60-70 fatcat:2p7lknladjdnxkjw3lgwit7dzq