粉土填充屋顶花园减震性能初探  

Primary research on seismic performance of roof garden with silt

作　　者：刘建宏 贾传果[2] 刘彦星 LIU Jianhong;JIA Chuanguo;LIU Yanxing(Shanxi Urban and Rural Planning and Design Institute Co.,Ltd.,Taiyuan 030001,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]山西省城乡规划设计研究院有限公司,山西太原030001 [2]重庆大学土木工程学院,重庆400045

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第2期310-316,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目资助(51408080)。

摘　　要：随着城市化的快速推进,屋顶花园优势凸显,但屋顶花园导致结构顶层地震作用倍增,这影响其在新建和既有建筑中的推广应用.震害研究表明,粉土液化有耗能潜力,且具有耗能强、带宽长的特点,但地基液化还很难用于减震设计.提出基于粉土液化的屋顶花园减震方法,即利用饱和粉土液化后表现出的黏滞流体特性,通过合理设计把屋顶花园变成调谐液体阻尼器.进行了一系列屋顶花园减震单层结构模型的自由振动试验,并利用振动台试验验证了其有效性.从可液化、可减震和可设计三个角度讨论了粉土填充屋顶花园减震功能拓展的可行性,为进行系统研究并最终形成一种经济、环保、简单、实用的结构减震控制方法奠定了基础.With quickly pushing forward to urbanization,the advantages of roof gardens are becoming obvious.Nevertheless,roof garden also causes enormous increase of its vertical load and horizontal earthquake action,which hinders its application to newly-built and existing buildings.According to earthquake damages and previous research,it is observed that liquefaction of saturated silt exhibits favorable energy-dissipation potential of longer bandwidth.But it is difficult to directly apply liquefaction of foundation to seismic design.Proposes a novel seismic mitigation method,which transmutes the silt-filled roof garden into a tuned liquid damper by considering the viscous fluid property of liquefied silt.A series of free-vibration tests were conducted.And then shaking table tests were carried out to valid the feasibility of the seismic mitigation method.Investigated the viability of the seismic mitigation function extension of the silt-filled roof garden in terms of its liabilities to liquefaction,energy-dissipation and design,which laid the foundation of systematically investigation and development of an economical,environmentally-friendly,simple and practical seismic mitigation method.

关 键 词：屋顶花园 减震性能 粉土液化 等效阻尼比 

分 类 号：TU352.1[建筑科学—结构工程]