西安建筑科技大学学报(自然科学版)

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.

引言
1 粉土填充屋顶花园减震机理及其可行性分析
2 粉土填充屋顶花园的自由振动试验
3 粉土填充屋顶花园的中型振动台试验
4 结论

图1 粉土填充屋顶花园系统<br/>Fig.1 The Silt-filled Roof Garden System

图1 粉土填充屋顶花园系统
Fig.1 The Silt-filled Roof Garden System

图2 振台试验装置图<br/>Fig.2 Photo of experimental device

图2 振台试验装置图
Fig.2 Photo of experimental device

图3 粉土减震屋顶花园结构地震反应时程:(a)El Centro波0.1g,(b)Taft波0.1g<br/>Fig.3 Seismic acceleration time-history curves of the structure with silt-filled roof garden

图3 粉土减震屋顶花园结构地震反应时程:(a)El Centro波0.1g,(b)Taft波0.1g
Fig.3 Seismic acceleration time-history curves of the structure with silt-filled roof garden

图4 自由振动试验模型<br/>Fig.4 Free vibration experimental model

图4 自由振动试验模型
Fig.4 Free vibration experimental model

图5 箱体长度和水深对水晃动频率的影响<br/>Fig.5 Box body length and water depth effects on water sloshing frequency

图5 箱体长度和水深对水晃动频率的影响
Fig.5 Box body length and water depth effects on water sloshing frequency

图6 不同配重模型顶部加速度时程曲线<br/>Fig.6 The acceleration response of the single-storey structure with different masses

图6 不同配重模型顶部加速度时程曲线
Fig.6 The acceleration response of the single-storey structure with different masses

图7 加载幅值与阻尼比关系曲线<br/>Fig.7 The relation curve of the equivalent damping ratio and the displacement amplitude

图7 加载幅值与阻尼比关系曲线
Fig.7 The relation curve of the equivalent damping ratio and the displacement amplitude

图8 阻尼比与粉土深度关系曲线<br/>Fig.8 The relation curve of the equivalent damping ratio and the depth of the saturated silt

图8 阻尼比与粉土深度关系曲线
Fig.8 The relation curve of the equivalent damping ratio and the depth of the saturated silt

图9 20 cm土深时结构顶部加速度时程曲线<br/>Fig.9 The acceleration curve of the roof with the soil depth of 20 cm

图9 20 cm土深时结构顶部加速度时程曲线
Fig.9 The acceleration curve of the roof with the soil depth of 20 cm

图10 20 cm土深时结构加速度时程曲线<br/>Fig.10 The acceleration curve of the roof with the soil depth of 20 cm

图10 20 cm土深时结构加速度时程曲线
Fig.10 The acceleration curve of the roof with the soil depth of 20 cm

表1 土深20 cm时试验结果<br/>Tab.1 Test results at 20 cm soil depth

表1 土深20 cm时试验结果
Tab.1 Test results at 20 cm soil depth

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备注

引言

1 粉土填充屋顶花园减震机理及其可行性分析

2 粉土填充屋顶花园的自由振动试验

3 粉土填充屋顶花园的中型振动台试验

4 结论

期刊信息