铁道工程学报
鐵道工程學報
철도공정학보
Journal of Railway Engineering Society
2015年
10期
110-114
,共5页
田承昊%董城%刘明%李建委
田承昊%董城%劉明%李建委
전승호%동성%류명%리건위
单层编织网壳%连续倒塌%平均应力比%线弹性静力分析%非线性静力分析
單層編織網殼%連續倒塌%平均應力比%線彈性靜力分析%非線性靜力分析
단층편직망각%련속도탑%평균응력비%선탄성정력분석%비선성정력분석
single-layer braided shell%progressive collapse%average stress ratio%linear elastic static analysis%nonlinear static analysis
研究目的:本文以某站房大跨单层编织网壳为对象,利用ANSYS有限元分析软件,对其进行抗连续倒塌分析。基于平均应力比的概念,根据柱子的应力大小,确定关键柱子。应用线弹性静力分析和非线性静力分析两种方法,对结构在单根关键柱失效的情况下的剩余结构进行连续倒塌分析。通过对比两种方法,从而探索此类大型公共建筑防止连续倒塌的更精确计算方法。研究结论:(1)采用平均应力比作为结构的移除指标以代替重要性系数的方法方便可行,说明此方法不仅适用于框架结构,也可推广到大跨空间结构;(2)静力分析方法比动力分析方法方便可行,但可能会导致更保守的结果;(3)边拱柱子失效后,边拱局部区域发生破坏,发生很大的位移及杆件转角,构件内力发生重分布,这说明边拱柱子是结构的重要部位,在使用过程中应重点防护;(4)拱顶接近悬挑端中部有部分杆件出现断裂情况,但没有大面积扩散,在实际设计中应对此部分进行重点防护;(5)本研究揭示的建筑连续倒塌的机制与模式,可用于大型车站建筑防爆抗爆及设计。
研究目的:本文以某站房大跨單層編織網殼為對象,利用ANSYS有限元分析軟件,對其進行抗連續倒塌分析。基于平均應力比的概唸,根據柱子的應力大小,確定關鍵柱子。應用線彈性靜力分析和非線性靜力分析兩種方法,對結構在單根關鍵柱失效的情況下的剩餘結構進行連續倒塌分析。通過對比兩種方法,從而探索此類大型公共建築防止連續倒塌的更精確計算方法。研究結論:(1)採用平均應力比作為結構的移除指標以代替重要性繫數的方法方便可行,說明此方法不僅適用于框架結構,也可推廣到大跨空間結構;(2)靜力分析方法比動力分析方法方便可行,但可能會導緻更保守的結果;(3)邊拱柱子失效後,邊拱跼部區域髮生破壞,髮生很大的位移及桿件轉角,構件內力髮生重分佈,這說明邊拱柱子是結構的重要部位,在使用過程中應重點防護;(4)拱頂接近懸挑耑中部有部分桿件齣現斷裂情況,但沒有大麵積擴散,在實際設計中應對此部分進行重點防護;(5)本研究揭示的建築連續倒塌的機製與模式,可用于大型車站建築防爆抗爆及設計。
연구목적:본문이모참방대과단층편직망각위대상,이용ANSYS유한원분석연건,대기진행항련속도탑분석。기우평균응력비적개념,근거주자적응력대소,학정관건주자。응용선탄성정력분석화비선성정력분석량충방법,대결구재단근관건주실효적정황하적잉여결구진행련속도탑분석。통과대비량충방법,종이탐색차류대형공공건축방지련속도탑적경정학계산방법。연구결론:(1)채용평균응력비작위결구적이제지표이대체중요성계수적방법방편가행,설명차방법불부괄용우광가결구,야가추엄도대과공간결구;(2)정력분석방법비동력분석방법방편가행,단가능회도치경보수적결과;(3)변공주자실효후,변공국부구역발생파배,발생흔대적위이급간건전각,구건내력발생중분포,저설명변공주자시결구적중요부위,재사용과정중응중점방호;(4)공정접근현도단중부유부분간건출현단렬정황,단몰유대면적확산,재실제설계중응대차부분진행중점방호;(5)본연구게시적건축련속도탑적궤제여모식,가용우대형차참건축방폭항폭급설계。
Research purposes:Taking a long -span single -layer latticed shell station for weaving,by using the ANSYS finite element analysis software,this paper analyzes anti progressive collapse.Based on the concept of average stress ratio,according to the size of column stress,the key columns are determined.The two kinds of methods of linear elastic static analysis and nonlinear static analysis are applied to progressive collapse analysis of residual structure in the case of the single key column failure.By comparing the two kinds of methods,the more accurate calculation method preventing this kind of large public buildings progressive collapse is explored. Research conclusions:(1 )The method using the average stress ratio as the removing index of the importance coefficient is feasible which shows that this method is not only suitable for frame structure,but also can be extended to long-span space structure.(2 )Static analysis method is more feasible than dynamic analysis method,but may lead to more conservative results.(3 )After the failure of the side arch column,side arch local regional failure occurred,large displacement and rotation angle bar appeared.This shows that side arch column is an important part of the structure and should focus on the protection of the side column in the use process.(4)Some bars of vault near central cantilever end rupture,but don't spread.So this section should be protected in the actual design.(5 )The research result about the mode and mechanism of building continuous collapse,can provide a reference and guidance for the anti-explosion and design of the similar station buildings.