采用黏滞阻尼伸臂桁架的超高层结构模型振动台试验研究  

Shaking table test of super high-rise structure with viscous damping outrigger truss

作　　者：陈才华 张宏 董皓 熊羽豪 郝玮 崔明哲 Chen Caihua;Zhang Hong;Dong Hao;Xiong Yuhao;Hao Wei;Cui Mingzhe(State Key Laboratory of Building Safety and Environment,Beijing 100013,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]建筑安全与环境国家重点实验室,北京100013 [2]中国建筑科学研究院有限公司,北京100013

出　　处：《土木工程学报》2023年第3期9-21,共13页China Civil Engineering Journal

基　　金：住房和城乡建设部科学技术项目计划(2021-K-022)。

摘　　要：黏滞阻尼伸臂桁架兼具高效耗能和“有限刚度”加强层的特点,可提高结构的抗震性能,尤其适用于高烈度区超高层结构抗震设计。中国国际丝路中心塔楼建筑高度498m,是目前全球最高的采用黏滞阻尼伸臂桁架的高层建筑,为验证其抗震性能和减震措施的有效性,进行了1∶40的缩尺模型振动台试验研究。本文介绍了模型设计、试验过程及主要现象。试验测试了结构在8度小震、8度中震、8度大震地震波输入下的动力响应,包括结构自振特性、动力放大系数、楼层位移、层间位移角、损伤发展及阻尼器耗能等。将主要试验结果与有限元分析结果进行了对比,总体上吻合程度较好,可互为验证。试验及分析结果表明:结构设计合理,采取的减震措施有效,结构整体抗震性能满足规范及预定的抗震性能目标要求;黏滞阻尼伸臂桁架产生的附加阻尼比随地震作用强度增加而降低,并且随主体结构进入弹塑性后进一步降低。根据试验结果对结构设计提出了相应的建议,揭示的阻尼比变化规律可供类似项目设计参考。Viscous damping outrigger truss has the characteristics of high energy dissipation and ‘limited stiffness’ strengthened layer, which can improve the seismic performance of the structure, especially suitable for seismic design of super high-rise structures in high intensity area.The tower of China International Silk Road Center is 498 meters high, which is the highest building with viscous damping outrigger truss in the world.In order to verify its seismic performance and the effectiveness of vibration damping measures, the shaking table tests on a 1∶40 scale model were carried out.In this work, the model design, test process and main phenomena were introduced.The dynamic responses of the structure under seismic waves of 8-degree frequent earthquake, 8-degree medium earthquake and 8-degree rare earthquake were tested, including structural natural vibration characteristics, dynamic amplification coefficient, floor displacement, story drift angle, damage development and energy dissipation of viscous damper.By comparing the main test results with the finite element analysis results, it is found that they are in good agreement.The test and analysis results show that the structural design is reasonable, the vibration damping measures are effective, and the overall seismic performance of the structure meets the specification and the predetermined seismic performance target.The additional damping ratio generated by the viscous damping outrigger truss decreases with the increase of seismic intensity, and further decreases with the elastic-plasticity of the main structure.According to the test results, the corresponding suggestions are put forward for the structural design.The rule of damping ratio variation was revealed, which can be used as a reference for the design of similar projects.

关 键 词：超高层结构 振动台试验 阻尼伸臂桁架 黏滞阻尼器 消能减震 附加阻尼比 

分 类 号：TU317.1[建筑科学—结构工程]