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类型 基础研究 预答辩日期 2018-01-24
开始(开题)日期 2015-01-19 论文结束日期 2017-11-28
地点 土木馆203 论文选题来源 973、863项目     论文字数 8.9 (万字)
题目 泡沫铝复合材料的力学性能及减震应用试验研究
主题词 泡沫铝复合材料,压缩性能,阻尼器,修正Bouc-Wen模型,相邻建筑结构
摘要 结构的消能减震技术作为一种有效的抗震技术,已经在工程中得到了广泛的应用。由于消能减震技术的关键在于所使用的阻尼材料,故若能研制出一种兼具阻尼和刚度一体的新型高阻尼材料,必能推动消能减震技术的发展。本文采用渗流的方法,将聚氨酯填充入球形开孔泡沫铝的孔洞内,制备成一种具有网络互穿式结构的泡沫铝复合材料(Aluminum Foam/ Polyurethane composites, 简写为AF/PU)。 为了能将AF/PU应用于土木工程结构的消能减震技术中,本文围绕AF/PU的力学性能和减震应用这两个方面,在AF/PU的单调和循环压缩性能试验、简化本构模型、AF/PU摩擦阻尼器的性能测试及力学模型、复合型AF/PU阻尼器在相邻建筑结构的减震控制应用等方面进行了系统深入的研究。所开展的主要研究工作和所取得的主要成果包括: (1)开展了AF/PU的单调压缩性能试验,对比了AF/PU、纯泡沫铝和聚氨酯单调压缩性能,分析了外围聚氨酯对AF/PU的力学贡献,探讨了铝体积分数对AF/PU单调压缩性能的变化规律。结果表明,AF/PU的压缩强度和刚度主要受铝体积分数影响,而聚氨酯的贡献甚微,可忽略外围聚氨酯的影响。使用Avalle宏观唯象本构模型模拟了AF/PU的单调压缩行为,其结果与试验结果吻合较好。 (2)进行了AF/PU的循环压缩性能试验,研究了加载幅值、加载速率和循环次数等加载工况对AF/PU的峰值应力、变形模量、耗能能力及残余应变等力学性能参数的影响规律,揭示了AF/PU的耗能机制主要为泡沫铝骨架与聚氨酯的界面摩擦阻尼。在此基础上,建立了适于AF/PU工程设计的简化四折线本构模型,该模型直观地反映AF/PU在整个变形过程中的宏观弹性性能和超弹性性能,并通过数值仿真结果和试验结果,验证了该模型的有效性。 (3)设计并制作了一种新型AF/PU摩擦阻尼器,进行了该阻尼器装置的力学性能试验,研究了预压力、加载频率、位移幅值和循环次数对该阻尼器的输出力、刚度和耗能能力等力学性能参数的影响。根据该阻尼器的受力特性,建立了修正Bouc-Wen模型,采用分步骤缩小参数取值范围的遗传算法对该模型进行参数识别,并对该阻尼器的力学性能进行了数值模拟。结果表明,该阻尼器是一种典型的位移幅值相关性的变刚度摩擦阻尼器,具有耗能能力强和刚度可变等特性。 (4)利用AF/PU摩擦单元与AF/PU压缩单元并联的工作原理,研制了一种新型的复合型AF/PU阻尼器,测试了加载频率和位移幅值对该阻尼器力学性能的影响。基于OpenSees软件平台编写的分线性段本构模型可用于该阻尼器力学性能的数值模拟。最后,以两栋分别为8层与3层的相邻框架结构为算例,对该阻尼器在该相邻结构体系中的地震反应进行了数值分析,并分别与吸振材料和粘滞流体阻尼器的消能减震体系做对比,验证了该阻尼器在相邻结构减震中的良好效果。
英文题目 EXPERIMENTAL STUDY ON MECHANICAL BEHAVIORS OF ALUMINUMS FOAM COMPOSITES AND THEIR APPLICATION IN SEISMIC ENERGY DISSIPATION
英文主题词 Aluminum Foam/Polyurethane composites, compression behavior, damper, modified Bouc-Wen model, adjacent building
英文摘要 Structural energy dissipation technology (SEDT) as an effective anti-earthquake technique has been widely used in civil engineering. As we know, the performance of SEDT mostly depends on its damping material. The development of the SEDT will be promoted, when an inovacative material both had high damping and stiffness is developed. The Aluminum Foam/Polyurethane composites (AF/PU) were frabricated by the infiltration method that infuses polyurethane (PU) into the spherical open-cell aluminum foam (AF) scaffold. AF/PU are the typical interpenetrating phase composites that combine both properties from PU and AF. In order to make AF/PU has a broad application in SEDT of civil engineering, there are two aspects are systematacially and deeply researched in this paper, including the mechanical behaviors of AF/PU and their application in seismic energy dissipation. The experimental and theoretical studies of AF/PU under the monotonic and cyclic compression are presented in the aspect of mechanical behavior. In the second aspect, it does not only contain the performance test and mechanical model of the AF/PU friction dampers, but also include the vibration control of the hybrid AF/PU damper in adjacent buildings. Therefore, the main research works and achievements are as follows: (1)The montonic compression behaviors of AF/PU were tested and compared with those of the pure AF and PU. The contribution of PU cover to the mechanical behaviors of AF/PU is analyzed and the variation of the compression behaviors of AF/PU with their aluminum volume fraction is discussed. The results show that the compressive strength and stiffness of AF/PU are mainly affected by their aluminum volume fractions, but the contribution of PU is so negligible that the influence of PU cover can be ignored. The Avalle’s macroscopic phenomenological constitutive model is used to simulate the monotonic compression behaviors of AF/PU, and the model results are in good agreement with the experimental results. (2)The cyclic compression tests of AF/PU were carried out. The effects of strain amplitude, strain rate and cyclic number on the mechanical parameters of AF/PU are investigated. The mechanical parameters contain peak stress, deformation modulus, energy dissipation capacity and residual strain. The results reveal that the energy dissipation mechanism of AF/PU in cyclic compression is mainly from the interfacial damping of AF and PU. Based on tested results, the simplified four linear model for engineering design is established. This model can reflect the macroscopic behavior and hyper-elasitic behavior of AF/PU during the cyclic compression process, and this model is found to adequately capture the cyclic compression response of AF/PU by comparisons with experimental data. (3)An innovative AF/PU friction damper is designed and fabricated. Experitmats were taken to investigate the influence of pre-compression, loading frequency, displacement amplitude and cyclic number on this damper’s mechanical behaviors, including damping force, stiffness and dissipated energy. According to experimental results, the Bouc-Wen model is modified to simulate the mechanical characteristics of AF/PU friction damper. The parameters of Modified Bouc-Wen model are identified by narrowing the range of parameters value in two steps when using the genertic algorithm. All of the results demonstrate that AF/PU friction damper is a typical displacement-correlated and variable-stiffness’s friction damper, and it has some advantageous properties such as high-dissipated energy and variable stiffness. (4)A new type of hybrid AF/PU damper is developed, which composes of a friction element in parallel with a compression element. The influence of loading frequency and displacement amplitude on the mechcanical behavior of hybrid AF/PU damper is examed. Based on OpenSees software, the linear segments model is complied to simulate the hysteretic respose of hybrid AF/PU damper. Finally, the adjacent 8-storey and 3-storey frame buiduings are selected as the modeling example. The hybrid AF/PU damper is adopted to analyze the pounding-involved and seismic response of these two buiduings under ground motions with different peak acceleration. The hybrid AF/PU damper is found to have a better earthquake mitigation effect and seismic pounding avoidance in adjacent buildings when compared to vibration absorbing material and fluid viscous damper.
学术讨论
主办单位时间地点报告人报告主题
北京建筑大学 2016年8月16日 3号大阶梯室 刘少波 泡沫铝复合材料的力学性能研究
东南大学抗震中心课题组 2017年7月14日 土木馆204 刘少波 泡沫铝复合材料的力学性能试验及减震阻尼器试验研究
东南大学抗震中心课题组 2014年8月1日 土木馆203 刘少波 泡沫铝在三维隔减震结构上的应用
东南大学抗震中心课题组 2014年9月10日 土木馆203 刘少波 泡沫铝/高阻尼橡胶及粘弹材料的复合阻尼材性试验
东南大学土木工程学院 2013年4月28日 九龙湖大学生活动中心报告厅 王亚勇 我国超高层建筑发展现状及技术要点
东南大学土木工程学院 2013年6月4日 致知堂 J Y Richard Liew Design and Construction of Unusual Steel Structures
北京建筑大学 2017年8月16日 3号大阶梯室 刘少波 Mechanical behavior and damping application of aluminum foam-polyurethane interpenetrating phase composites (AF/PU)
东南大学土木工程学院 2015年1月15日 逸夫科技馆报告厅 聂建国 科研体会—组合结构的创新与实践
     
学术会议
会议名称时间地点本人报告本人报告题目
第九届全国减震控制学术会议 2015年11月17日 中国,广州 泡沫铝/聚氨酯复合材料(AF-PU)耗能性能的试验研究
2016 EMI International Conference 2016年10月27日 法国,梅兹 Experimental observation and numerical simulation of aluminum foam-polyurethane interpenetrating phase composites (AF-PU composites)
2016国际工程科技发展战略高端论坛 2016年5月14日 中国,重庆
     
代表作
论文名称
Cyclic compression behavior and energy dissipation of aluminum foam-polyurethane interpenetrating p
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
陈忠范 正高 教授 博导 东南大学
黄东升 正高 教授 博导 南京林业大学
左晓宝 正高 教授 博导 南京理工大学
王浩 正高 教授 博导 东南大学
郭彤 正高 教授 博导 东南大学
      
答辩秘书信息
姓名职称工作单位备注
陆飞 正高 副教授 东南大学