中空夹层玻璃及其支承系统的爆炸冲击响应研究  

A Study of the Dynamic Response of Hollow Laminated Glass with Supporting System Under Blast Load

作　　者：郭校宏 刘耀鹏 陈新能 欧阳子健 李帼昌[1] GUO Xiaohong;LIU Yaopeng;CHAN Sunnung;AUYEUNG Tszkin;LI Guochang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;NIDA Technology Company Limited,Hong Kong 999077,China;Far East Facade(Hong Kong)Limited,Hong Kong 999077,China)

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168 [2]宁达科技有限公司,中国香港999077 [3]远东幕墙(香港)有限公司,中国香港999077

出　　处：《建筑钢结构进展》2023年第11期89-98,共10页Progress in Steel Building Structures

摘　　要：玻璃幕墙已被广泛应用于建筑结构中,但目前的设计主要针对静力荷载,对可能发生的爆炸等意外事件所产生的冲击荷载作用尚缺乏可靠研究。对爆炸冲击下的玻璃进行数值分析时,多数研究模型将边界条件过度简化,使玻璃面板直接承受爆炸冲击,忽略了支承体系中诸如框架、垫片、结构胶、滑移块等元件的缓冲作用。这种差异在中空夹层玻璃系统上更为明显,导致数值分析难以精确地模拟结构系统在冲击荷载作用下的响应。为此,对一玻璃幕墙系统进行足尺爆炸冲击试验研究,并采用LS-DYNA软件进行了精细化建模,考虑支承体系内的各元件作用及元件之间的接触行为,以及各元件对玻璃的夹紧力作用等因素。分析结果表明,相比于简化边界条件的模型,考虑多要素的框架模型得出的玻璃面板挠度及速度时程曲线、能量传递等更加合理,且裂纹模态和裂纹动态扩展与试验结果更加吻合。爆炸冲击下中空夹层玻璃的两种常用简化分析模型均不能获得准确的结果:简化的夹板支承模型缺少必要的约束条件,导致玻璃系统整体位移过大而发生破坏;简支模型则约束过强,会导致玻璃应力增大,尤其会在边界区域发生更多的强度破坏。因此,设计抗爆玻璃时应重视缓冲体系的设计,在数值分析时则应充分考虑支承系统各元件的影响。Glass curtain walls have been widely used in building structures.However,the current designs mainly focus on static loads,with limited reliable research on the impact loads generated by potential accidental events such as explosions.In numerical analyses of glass subjected to blast impact,most research models over simplify the boundary conditions,with glass panels directly bearing the blast impact and neglecting the buffering effects of components in the supporting system such as frames,gaskets,structural adhesives,and sliding blocks.This discrepancy is more pronounced in insulating laminated glass systems,making it difficult to accurately simulate the structural system response under blast loads.This paper presents a full-scale blast impact test on a glass curtain wall system and a refined model using the LS-DYNA software which accounts for the effects of various components in the supporting system,the contact behavior between components,and the clamping force on the glass.The analysis results show that compared to the simplified boundary condition models,the multi-factor framework model yields more reasonable glass panel deflection and velocity time-history curves,energy transfer,and better agreement of crack patterns and dynamic crack propagation with test results.Both commonly used simplified models for insulating laminated glass cannot obtain accurate results.The simplified plate-supported model lacks necessary constraint conditions,leading to excessive overall displacement and failure of the glass system.While the simply supported model has excessive constraints,which results in increased glass stresses and more severe strength failure,particularly in the boundary regions.This study suggests that the design of blast-resistant glass should prioritize the design of buffering systems,and numerical analyses should fully consider the impact of various components in the supporting system.

关 键 词：建筑玻璃 爆炸荷载 数值模拟 支承结构 精细化建模 

分 类 号：TU382[建筑科学—结构工程]