火灾科学
火災科學
화재과학
FIRE SAFETY SCIENCE
2011年
3期
146-151
,共6页
钢构件%防火性能%抗火设计%有限元%刚度%临界温度
鋼構件%防火性能%抗火設計%有限元%剛度%臨界溫度
강구건%방화성능%항화설계%유한원%강도%림계온도
Steel structures%Fire performance%Fire resistance design%Finite element%Stiffness%Critical temperature
首先有针对性地对当前国内外建筑钢结构中钢构件的防火性能与抗火设计研究背景做了较系统分析,接着,通过有限元程序,对当前应用非常广泛的半刚接门式刚架建筑在火灾高温下的受力性能进行了整体结构非线性分析。计算结果表明：随着温度的升高,钢构件节点的刚度不断下降,当节点的刚度下降到不能约束与其连接的梁柱构件时,结构将发生突然坍塌性破坏;由于在高温下钢材的屈服强度下降较快,半刚性连接性能虽然能使梁柱节点处的受力性能改善,但不能提高整体结构的临界温度。
首先有針對性地對噹前國內外建築鋼結構中鋼構件的防火性能與抗火設計研究揹景做瞭較繫統分析,接著,通過有限元程序,對噹前應用非常廣汎的半剛接門式剛架建築在火災高溫下的受力性能進行瞭整體結構非線性分析。計算結果錶明：隨著溫度的升高,鋼構件節點的剛度不斷下降,噹節點的剛度下降到不能約束與其連接的樑柱構件時,結構將髮生突然坍塌性破壞;由于在高溫下鋼材的屈服彊度下降較快,半剛性連接性能雖然能使樑柱節點處的受力性能改善,但不能提高整體結構的臨界溫度。
수선유침대성지대당전국내외건축강결구중강구건적방화성능여항화설계연구배경주료교계통분석,접착,통과유한원정서,대당전응용비상엄범적반강접문식강가건축재화재고온하적수력성능진행료정체결구비선성분석。계산결과표명：수착온도적승고,강구건절점적강도불단하강,당절점적강도하강도불능약속여기련접적량주구건시,결구장발생돌연담탑성파배;유우재고온하강재적굴복강도하강교쾌,반강성련접성능수연능사량주절점처적수력성능개선,단불능제고정체결구적림계온도。
This paper first makes a summary on the current research status for the fire performance and fire resistance design of construction steel structure steel members,and then,it uses a finite element program to conduct a nonlinear analysis on the mechanical properties of the overall structure for the door type frame construction under high temperatures in fire.The results show that,with the increase of temperature,the stiffness of the steel members node decreases.When the stiffness of the node is not enough to support the structure constraint for the connected beam-column components,the structure will collapse.Due to that in high temperatures the strength of the steel decreases quickly,although the semi-rigid connection performance can improve the mechanical properties for the beam-column joints,the critical temperature for the failure of the overall structure could not be increased.
