气-膜耦合作用下ETFE气枕的静力研究  

Static behavior of ETFE cushions under air-membrane interaction

作　　者：王晓峰[1] 李卓然 杨庆山[2] WANG Xiaofeng;LI Zhuoran;YANG Qingshan(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044;School of Civil Engineering,Chongqing University,Chongqing 400044)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]重庆大学土木工程学院,重庆400044

出　　处：《建筑结构学报》2023年第4期158-166,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(51778041,51278049)。

摘　　要：为了研究气-膜耦合作用机理,对方形乙烯-四氯乙烯共聚物(ETFE)气枕进行静力荷载试验,研究气-膜耦合作用及其随影响因素的变化规律。通过在上膜面均匀铺置沙袋对气枕施加均布荷载,获得膜面位移、内压和膜面矢高。通过与有限元分析结果进行对比,校核试验结果的精确性。并通过将内充气体分别在恒质量和恒压情况下的试验结果进行对比,研究ETFE气枕的气-膜耦合作用特征及其随荷载、初始内压和气枕尺寸的变化规律。结果表明:气-膜耦合作用使气枕的上下膜面协同工作,共同承担外荷载、抵抗变形;随着荷载的增加,气-膜耦合作用逐渐增强;在荷载不变时,气-膜耦合作用随初始内压的升高而减弱,随气枕尺寸的增大而增强。For the purpose of exploring the mechanism of air-membrane interaction, the air-membrane interaction and its variation with the influencing factors were studied through experiments on square ETFE cushions under static load. Uniformly-distributed loads were applied by laying sandbags uniformly on the top membrane to obtain membrane displacement, inner air pressure and rise of ETFE cushions. Experimental results were compared with the corresponding finite element solutions for verification of their accuracy. Thereafter, air-membrane interaction and its variation with the load, initial inner pressure and cushion dimensions were experimentally studied by comparing the performance of the cushions with constant inner air mass and constant inner air pressure. The results indicate that the top and bottom membranes work in a cooperative way through the air-membrane interaction, bearing external load and resisting deformation together. The air-membrane interaction is gradually strengthened with the increase of load. And when the external load is kept constant, air-membrane interaction decreases with the rise in initial air pressure and grows with the increase in cushion dimensions.

关 键 词：ETFE气枕 气-膜耦合作用 静力试验 均布荷载 内充气体恒质量 内充气体恒压 

分 类 号：TU383[建筑科学—结构工程]