某航站楼在爆炸作用下抗倒塌性能研究  

Anti-collapse performance of terminal building under blast loads

作　　者：范重[1] 陈亚丽 陈巍[1] 张宇[1] 刘涛[1] FAN Zhong;CHEN Yali;CHEN Wei;ZHANG Yu;LIU Tao(China Architecture Design&Research Group,Beijing 100044,China;China Construction Xinjiang Construction(Group)Co.,Ltd.East China Branch,Hangzhou 311215,China)

机构地区：[1]中国建筑设计研究院,北京100044 [2]中建新疆建工(集团)有限公司华东分公司,浙江杭州311215

出　　处：《建筑结构学报》2020年第9期33-44,共12页Journal of Building Structures

基　　金：中国建设科技集团科技创新基金项目(Z2016J05)。

摘　　要：为了避免抗倒塌性能分析时确定关键构件的盲目性,考虑相邻构件损伤的影响,评估爆损构件残余承载力对结构抗倒塌性能的影响,首先根据航站楼结构的特点与可能遭遇爆炸的危险程度,合理确定大跨度钢结构抗爆关键构件的可能部位。通过对爆炸当量、爆炸距离与结构构件损伤程度关系的研究,确定关键构件及其相邻构件的损伤情况。分别采用移除构件法与多尺度模型对破坏严重的构件进行模拟,考察航站楼结构在爆炸作用下的抗倒塌性能。分析结果表明,箱形钢柱的损伤程度主要与爆心距离和爆炸当量有关,迎爆面的变形远大于背爆面,柱顶斜撑杆的损伤程度与爆炸冲击波的入射夹角关系密切。采用移除构件法进行大跨度结构抗倒塌性能分析时,屋盖的局部变形很大,结构发生局部严重破坏,分析结果偏于保守。通过多尺度模型,可以采用壳单元较为准确地模拟构件在爆炸作用下的损伤情况。由于大跨度的竖向构件具有较大的冗余度,爆损后仍然具有一定的残余承载力,可以有效抑制变形的发展,采用多尺度模型得到的屋盖变形远小于移除构件法的分析结果。In the anti-collapse performance analysis of a structure,it is important to properly determine the key components,to consider the effects of damage to adjacent components,and to evaluate the relationship between the residual bearing capacity of the blast-damaged members and the collapse resistance of the structure.In this paper,the possible locations of key components of the anti-explosion performance of the large-span steel structure were first determined according to the characteristics of the terminal structure and the effect of possible blast loads.Through the study of the relationship among the explosive equivalent,blast distance and damage degree of structural members,the damage of key components and their adjacent components was determined.The alternate path method and the multiscale model were used to simulate the collapse resistance of the terminal structure under blast loads.The analysis results show that the damage degree of the box-shaped steel column is mainly related to the blast distance and the explosive equivalent.The deformation of the blasting surface is much larger than that of the back of blasting surface.The damage degree of the oblique members is closely related to the incident angle of the explosion shock wave.When the alternate path method was used to analyze the collapse resistance of large-span structures,the local deformation of the roof is very large,and the structure is seriously damaged locally.The analysis results are conservative.In the multi-scale model,shell elements can be used to accurately simulate the damage of the component under blast loading.Due to the large redundancy of the vertical members of the large-span structure,the structure still has a certain residual bearing capacity after the explosion,which can effectively suppress the development of the deformation.The deformation result of the roof obtained by the multi-scale model is much smaller than the computing result of the alternate path method.

关 键 词：大跨度结构 爆炸作用 移除构件法 多尺度模型 破坏形态 变形 

分 类 号：TU393.3[建筑科学—结构工程] TU375.4