摘要
为了研究框支式PVB(聚乙烯醇缩丁醛)中空夹层玻璃在远场爆炸作用下的响应特征与协同工作机制,采用LSDYNA软件建立了考虑面板-中空腔耦合作用的有限元模型,通过与场地爆炸试验结果对比进行验证。通过参数分析,明确接触协同承载、非接触协同承载和迎爆面独立承载三种典型的受爆协同工作模式及其荷载分配特征。以吸能差异系数、面板能量占比系数和位移比例系数作为定量表征内、外侧面板荷载分配特性的特征参数,建立其与爆炸超压及冲量、面板尺寸和中空腔尺寸等关键因素的关系。进一步以玻璃面板-中空腔刚度比为无量纲参数,得到位移比例系数对比例爆距不敏感,而与刚度比正相关,且当玻璃面板-中空腔刚度比小于0.6时,面板间协同工作性能较好。建立并验证了基于动态荷载分配系数的框支式中空夹层玻璃抗爆设计简化方法,该方法在比例爆距4.3~10.8 m/kg^(1/3)、面板宽厚比大于125、中空腔宽厚比大于83的范围内具有较高精度。
To systematically investigate the response characteristics and collaborative working mechanism of framesupported PVB(polyvinyl butyral)-laminated insulating glass under far-field blast loading,a finite element model considering the fluid-structure interaction between the glass panels and cavity was developed using LS-DYNA and validated against the test results.Through parametric analysis,three typical collaborative modes(contact collaborative load-bearing mode,non-contact collaborative load-bearing mode and independent front panel loadbearing mode)were identified,along with their respective load-sharing characteristics.Three key parameters(energy absorption difference coefficient,panel energy proportion coefficient,and displacement proportion coefficient)were introduced to quantitatively characterize the load sharing features between the inner and outer panels,and their relationships with blast scenarios,panel sizes,and insulating cavity thicknesses were systematically established.Furthermore,the dimensionless stiffness ratios between the glass panels and the insulating cavity were proposed.Results indicate that the displacement proportion coefficient is insensitive to scaled distance but exhibits a positive correlation with the stiffness ratio.Superior collaborative performance between panels is observed at stiffness ratios below 0.6.Finally,a simplified dynamic load sharing factor-based method was proposed and validated,demonstrating high accuracy within scaled distances of 4.3 m/kg^(1/3) to 10.8 m/kg^(1/3),panel and cavity width-to-thickness ratios exceeding 125 and 83,respectively.
作者
陈素文
陈旭
金志鹏
陈星
CHEN Suwen;CHEN Xu;JIN Zhipeng;CHEN Xing(State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;State Grid Gansu Electric Power Company Construction Branch,Lanzhou 730050,China)
出处
《建筑结构学报》
北大核心
2025年第9期276-288,共13页
Journal of Building Structures
基金
国家自然科学基金面上项目(51678448,52478551)
土木工程防灾减灾全国重点实验室自主课题(SLDRCE19-B-18)。
关键词
PVB中空夹层玻璃
抗爆设计
协同工作机制
场地爆炸试验
数值模拟
动态荷载分配系数
PVB insulating laminated glass
blast resistant design
collaborative working mechanism
test
numerical simulation
dynamic load sharing factor field blast
