- 摘 要
-
(安徽建筑大學(xué)土木工程學(xué)院, 合肥 230022)
［摘要］噴淋水對高溫鋼結(jié)構(gòu)的急速冷卻會對結(jié)構(gòu)產(chǎn)生很大的沖擊。冷卻初期，結(jié)構(gòu)的極限承載力有一定程度的增加，而再進(jìn)一步冷卻反而會使其極限承載力降低；在高溫鋼結(jié)構(gòu)受到低溫水的冷卻過程中，冷卻水溫對結(jié)構(gòu)的極限承載力影響較大，同時，溫度低于5℃噴淋水的急速冷卻過程導(dǎo)致結(jié)構(gòu)極限承載力下降幅度的最低值要比水溫高于6℃噴淋水作用時大很多。在冷卻初期，極限承載力達(dá)到的最大值也隨冷卻水溫的降低而增大，而在冷卻過程達(dá)到的最低值也要小很多，有時相差達(dá)到1倍以上。冷卻位置對結(jié)構(gòu)的極限承載力影響很大，在中間跨左側(cè)梁柱節(jié)點(diǎn)噴水冷卻時對結(jié)構(gòu)的極限承載力影響最大，在中間跨梁的跨中下方次之。溫度高于550℃的鋼框架在梁柱節(jié)點(diǎn)處噴水冷卻很可能在短時間內(nèi)引發(fā)結(jié)構(gòu)的破壞性坍塌，而溫度低于500℃鋼框架在噴水冷卻過程破壞的程度要低很多。
［關(guān)鍵詞］火災(zāi)； 高溫; 鋼框架； 極限承載力； 噴淋水； 快速冷卻
中圖分類號： TU392.1 文獻(xiàn)標(biāo)識碼： A文章編號： 1002-848X(2016)S1-0583-08
Research on damaged behavior of high temperature steel frame structure
rapidly cooled by spray water in fire
Xia Yunchun
(School of Civil Engineering, Anhui Jianzhu University, Hefei 230022, China)
Abstract： Spray water had a strong impact on a high temperature steel frame structure in fire. In early cooling, ultimate bearing capacity of the structure increased a little, while further cooling would make the ultimate bearing capacity reduced. During rapid cooling, the temperature of cooling water had a large effect on the ultimate bearing capacity of the structure, the maximum decrease value caused by spray water below 5℃ was much larger than that caused by spray water above 6℃. In the initial cooling, the maximum ultimate bearing capacity also reduced with the increase of cooling water temperature, while its minimum value was much smaller, sometimes the difference was more than 1 time. Location had also a great effect on the ultimate bearing capacity for steel frame structure, it was the maximum when the structure was cooled at the left joint of beam-to-column in fire span, and the second largest effect was at the mid-span of beam in fire span. A steel frame structure, whose temperature was over 550℃, was likely to lead to collapse destructively in a short time when it was cooled at the joints of beam-to-column in fire span, but for the structure, whose temperature was below 500℃, the damage was much lower even it was cooled at the joints of beam-to-column in fire span.
Keywords： fire； high temperature; steel frame structure； ultimate bearing capacity； spray water； rapid cooling
作者簡介： 夏云春，博士，教授，Email:wxiayc@126.com。
*國家自然科學(xué)基金(51478002)。
- 下載地址
-
