| In the use of life cycle,The structure may be liable to bring all kinds of accidental loads(such as explosion,bump,etc),which can makes the role of local happened destroyed.If the structure of resist progressive collapsed is not enough,it's can make momentary collapse by local bottom-up,chase type to whole collapsed.Causes heavy casualties and property losses. the foreign studies of this fied have began to fight continuous collapsed structure for mulated relevant design apecification.View our studies in this fied startting evening,are not yet in the establishment of a complete structural resistance design code for collapsed.This paper reviews the research situation and main achievements of the structure resisted progressive collapsed on abroad and home,summarizes the design method for structure resisted progressive collapsed.The auther adopts dismantled component method for reinforced concrete frame structure by finite element analysis software SAP2000,in order to research its resisted progressive collapsed ability. Research shows that:First, through dismantled component analysis the structure resisted progressive collapsed, stele is demolished structure resisted to continuous collapsed ability, most powerful; Side pillar is poorer; JiaoZhu is the worst.Second, dismantling "failure" column, the structure internal force on the adjacent to a little effect, the biggest framework of the internal force occurred with "failure" column on the beam directly connected. The floors with the increased, frame beams three-bit and shear value gradually reduced.Third, the beam of structure's span has a significant effect on the tance to resisted progressive collapsed ability.When the span is 5m to 8m, bending moment was uniform, detente.Fourth, change value When the Span is more than 8m, bending moment increasing speed, the increase of several floors no significant increased structure, but can make internal force responses load transfer path that the upper structure internal force increased a little change.Fifth, for frame structure, frame beams of the stiffness in the in-plane than floor in in-plane stiffness, and when the structure is destroyed,it is not film occurred the theory of hypothesis. So the slab of the frame structure has little impact resisted progressive collapsed ability.Sixth, with the improvement of seismic fortification intensity, the longitudinal reinforcement frame beams are obviously increase, which helps to enhance structure resistance capability, but structure progressive collapsed in the aseismic design of design and not collapsed with resistance, resistance positively related to the design of the collapse of the longitudinal beam through increased stiffness of reinforced, make beams increase, this bucking structure seismic design "strong column weak beam" design requirements.Seventh, because of each component force uniform The typical frame,so its Resistance to continuous collapsed ability is stronger than atypical framework. Through the research found that according to our norm design the framework don't meet the requirements of the structural resistance progressive collapsed.Eighth, this paper puts forward on the basis of design method of resistance to progressive collapsed on home and abroad's studies, satisfying the structue resisted progressive collapsed under the condition of ability request, according to the method in this paper, reinforced dosage quantity of beam has 10% decreased than the GSA design guidelines, and the bottom of the structure's reinforced amount is less than that the top of the structure. |
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