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(安徽建筑大學(xué)土木工程學(xué)院， 合肥 230022)

［摘要］針對(duì)低溫噴淋水作用下高溫鋼結(jié)構(gòu)急速冷卻產(chǎn)生的沖擊效應(yīng)，建立了彈簧-梁柱的簡(jiǎn)化分析三折線模擬彈簧模型以及基于能量平衡的簡(jiǎn)化分析方法，鋼框架結(jié)構(gòu)在噴水冷卻過(guò)程中其屈曲前的變形不大，比受熱升溫過(guò)程中的要小很多，但結(jié)構(gòu)局部的最大軸力要比受熱升溫過(guò)程中的大很多，能夠達(dá)到升溫過(guò)程中的4.5倍以上。同時(shí)，將相關(guān)的計(jì)算結(jié)果與模擬結(jié)果進(jìn)行比較，二者的結(jié)果非常接近，結(jié)果相差在2.6%以內(nèi)，完全可以滿足相關(guān)工程計(jì)算精度的技術(shù)要求。本簡(jiǎn)化計(jì)算方法可以用于分析和評(píng)估火災(zāi)高溫鋼框架在噴淋水快速冷卻下結(jié)構(gòu)的損傷和破壞程度。

［關(guān)鍵詞］高溫； 鋼框架； 噴淋水； 急速冷卻； 簡(jiǎn)化分析方法

中圖分類號(hào)： TU392.1 文獻(xiàn)標(biāo)識(shí)碼： A文章編號(hào)：  1002-848X(2016)S2-0410-07

Simplified analysis method for the damage of high temperature steel frame

 rapidly cooled by spray water in fire

Xia Yunchun， Xu Zhengchao

(School of Civil Engineering, Anhui Jianzhu Univrsity, Hefei 230022, China)

Abstract： For the impact effect of rapid cooling by spray water at low temperature on high temperature steel frame structure, a three-broken-line simulation model and simplified analysis method based on energy balance for spring-beams and columns was set up.Deformation of steel frame structure, before buckling in water spray cooling process was not large, it was much smaller than that produced in heating-up, but its local maximum axial force was much larger than that produced during heating-up, their difference could reach more than 4.5 times. The related calculation and simulation results were analyzed and compared, they were very close to each other, their average difference were below 2%, the simplified analysis method could completely meet the precision requirement of engineering calculation, it was useful to analyze and evaluate the damage and destruction of high temperature steel frame structure rapidly cooled by spray water.

Keywords： high temperature; steel frame structure； spray water； rapid cooling；simplified analysis method

作者簡(jiǎn)介： 夏云春，博士，教授，Email:wxiayc@126.com。

*國(guó)家自然科學(xué)基金(51478002)。