摘要
在山区桥墩抗滚石冲击领域中,防护结构优良的耗能性能是保证桥墩安全稳定的关键。为此,引入泡沫铝夹芯结构,通过MTS压缩试验与动力有限元分析芯体厚度变化对夹芯板耗能性能的影响。结果表明:相比于单层泡沫铝夹芯板,相同压载条件下双层泡沫铝夹芯板具有更优良的耗能能力;对于双层泡沫铝夹芯板,一定程度上增大上下层泡沫铝芯体厚度均可有效提升夹芯板耗能性能,然而,当芯体厚度增大到一定值时,夹芯板耗能性能不再显著提升;双层泡沫铝夹芯板上下层厚度的最优化比例为3:2。上述研究成果已应用于S303映(秀)-卧(龙)公路青岗坪渔子溪大桥桥墩,防护效果显著。
Excellent energy-absorption property of aluminum foam sandwich(AFS)structure is the crucial to ensure the safety and stability of bridge piers against rockfalls in mountainous areas.In order to analyze the effect of AF core thickness on energy-absorption performance of AFS panels,laboratory compression tests and dynamic finite element analysis were performed.The results showed that a double-layer AFS panel has a better energy absorption performance than a single-layer AFS one does under the same loading condition;for double-layer AFS panels,increasing the upper layer or/and the lower layer AF core thickness can effectively improve their energy absorption performance;the performance is no longer significant when core thickness increases to a certain threshold;an optimized proportion of AF core thickness is T upper∶T lower=3∶2.The study results were applied to the demonstration project of YU Zixi bridge piers,the protection effect was remarkable.
作者
程鹏
李伟
翟敏刚
王东坡
CHEN Peng;LI Wei;ZHAI Mingang;WANG Dongpo(CCCC First Highway Consultants Co. Ltd., Xi’an 710064, China;Shaanxi Provincial Key Lab for Highway Bridge & Tunnel,Chang’an University, Xi’an 710064, China;China Communication High Tech Industry Development Company Limited,Xi’an 710065, China;State Key Lab of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第5期85-91,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(41502297
41790433)
中国博士后科学基金第61批面上资助项目(2017M612997)
关键词
滚石冲击
泡沫铝夹芯板
耗能缓冲
结构优化
rockfalls impact
aluminum foam sandwich panel
energy absorption
structure optimization
