Spectrum characteristics of different types of seismic waves and dynamic response characteristics of super high-rise building structures under long-period ground motions were comparatively analyzed. First, the ground ...Spectrum characteristics of different types of seismic waves and dynamic response characteristics of super high-rise building structures under long-period ground motions were comparatively analyzed. First, the ground response wave （named LS-R wave） of a soft soil site with deep deposit, taking long-period bedrock seismic record as input, was calculated by wave propagation method. After that, a TOMAKOMAI station long-period seismic record from the Tokachi-Oki earthquake and conventional E1-Centro wave were also chosen. Spectrum characteristics of these waves were analyzed and compared. Then, a series of shaking table tests were performed on a 1：50 scale super high-rise structural model under these seismic waves. Furthermore, numerical simulation of the prototype structure under these excitations was conducted, and structure damages under different intensive ground motions were discussed. The results show that： 1） Spectrum characteristics of ground response wave are significantly influenced by soft soil site with deep deposit, and the predominant period has an increasing trend. 2） The maximum acceleration amplification factor of the structure under the TOM wave is two times that under the E1-Centro wave; while the maximum displacement response of the structure under the TOM wave is 4.4 times that under the E1-Centro wave. Long-period ground motions show greater influences on displacement responses than acceleration responses for super high-rise building structures. 3） Most inelastic damage occurs at the upper 1/3 part of the super high-rise building when subjected to long-period ground motions.展开更多
In this study a 10-storied residential building model was employed to clarify the ventilation characteristics of the atrium and the rooms,which were effected by the different forms of lateral openings.The experiment w...In this study a 10-storied residential building model was employed to clarify the ventilation characteristics of the atrium and the rooms,which were effected by the different forms of lateral openings.The experiment was conducted under the combined effect of wind force and thermal buoyancy,and the similarity requirements were satisfied.The results have shown that the different forms of lateral openings cause the different ventilation effect of the building,and also have some certain regularity.The conclusions provide a theoretical foundation for how to use the ventilation of atrium better in high-rise residential building.展开更多
惯容器是一种两端点加速度相关型控制元件,具有表观质量放大、耗能增效等特性,可更加高效、经济地进行结构振动控制,将惯容器表观质量增大的特性拓展到调谐减震装置中可实现轻量化振动控制。为研究高层结构上附加旋转惯质双调谐质量阻尼...惯容器是一种两端点加速度相关型控制元件,具有表观质量放大、耗能增效等特性,可更加高效、经济地进行结构振动控制,将惯容器表观质量增大的特性拓展到调谐减震装置中可实现轻量化振动控制。为研究高层结构上附加旋转惯质双调谐质量阻尼器(rotating inertia dual-tuned mass damper,RIDTMD)的轻量化振动控制效果,采用柔度法求逆的方法获得等效简化模型;通过结构模态分析、时程分析验证了等效模型的可靠性;建立附加RIDTMD多自由度结构的力学模型与运动方程;采取H_(2)优化和给定质量、阻尼参数的取值区间来确定RIDTMD的参数。在一个51层的框架核心筒结构上设计了RIDTMD,分析其在地震激励下的楼层位移、加速度和层间位移角等结构响应,频域与时程分析结果看,以调谐质量阻尼器(tuned mass damper,TMD)控制效果为目标的H_(2)优化设计可以使RIDTMD有着与TMD类似的振动控制效果,与无控结构相比,顶层峰值位移、均方根位移最大可分别降低18.0、32.9%,且RIDTMD的调谐质量比TMD减少30.0%。展开更多
近年来,国际上不同国家和地区有关风荷载计算的规范均有不同程度的更新迭代,为了研究规范中风荷载及风致加速度计算参数的差异影响,以联邦航空咨询委员会(Commonwealth Advisory Aeronautical Research Council,CAARC)提出的简单标准模...近年来,国际上不同国家和地区有关风荷载计算的规范均有不同程度的更新迭代,为了研究规范中风荷载及风致加速度计算参数的差异影响,以联邦航空咨询委员会(Commonwealth Advisory Aeronautical Research Council,CAARC)提出的简单标准模型试验为例,对不同国家和地区的矩形高层建筑顺风向风荷载及风致加速度进行对比研究。首先,对不同规范给定的风场特性及风场参数进行了详细分析;随后,将不同规范中的风荷载和风致加速度计算公式归一化处理;最后,结合风洞试验结果,详细讨论参考风速、湍流强度、湍流积分尺度、峰值因子、背景响应因子、共振响应因子、阵风响应因子的差异及其对风荷载及风致加速度的影响。结果表明:风场参数的差异是造成高层建筑顺风向风荷载和风致加速度不同的决定性因素。展开更多
基金Project(50978198) supported by the National Natural Science Foundation of ChinaProject(SLDRCE08-B-03) supported by the Ministry of Science and Technology of China
文摘Spectrum characteristics of different types of seismic waves and dynamic response characteristics of super high-rise building structures under long-period ground motions were comparatively analyzed. First, the ground response wave （named LS-R wave） of a soft soil site with deep deposit, taking long-period bedrock seismic record as input, was calculated by wave propagation method. After that, a TOMAKOMAI station long-period seismic record from the Tokachi-Oki earthquake and conventional E1-Centro wave were also chosen. Spectrum characteristics of these waves were analyzed and compared. Then, a series of shaking table tests were performed on a 1：50 scale super high-rise structural model under these seismic waves. Furthermore, numerical simulation of the prototype structure under these excitations was conducted, and structure damages under different intensive ground motions were discussed. The results show that： 1） Spectrum characteristics of ground response wave are significantly influenced by soft soil site with deep deposit, and the predominant period has an increasing trend. 2） The maximum acceleration amplification factor of the structure under the TOM wave is two times that under the E1-Centro wave; while the maximum displacement response of the structure under the TOM wave is 4.4 times that under the E1-Centro wave. Long-period ground motions show greater influences on displacement responses than acceleration responses for super high-rise building structures. 3） Most inelastic damage occurs at the upper 1/3 part of the super high-rise building when subjected to long-period ground motions.
基金Supported by the National Natural Science Foundation of China(50778064)Hunan Natural Science Foundation(07jj6088)
文摘In this study a 10-storied residential building model was employed to clarify the ventilation characteristics of the atrium and the rooms,which were effected by the different forms of lateral openings.The experiment was conducted under the combined effect of wind force and thermal buoyancy,and the similarity requirements were satisfied.The results have shown that the different forms of lateral openings cause the different ventilation effect of the building,and also have some certain regularity.The conclusions provide a theoretical foundation for how to use the ventilation of atrium better in high-rise residential building.
文摘惯容器是一种两端点加速度相关型控制元件,具有表观质量放大、耗能增效等特性,可更加高效、经济地进行结构振动控制,将惯容器表观质量增大的特性拓展到调谐减震装置中可实现轻量化振动控制。为研究高层结构上附加旋转惯质双调谐质量阻尼器(rotating inertia dual-tuned mass damper,RIDTMD)的轻量化振动控制效果,采用柔度法求逆的方法获得等效简化模型;通过结构模态分析、时程分析验证了等效模型的可靠性;建立附加RIDTMD多自由度结构的力学模型与运动方程;采取H_(2)优化和给定质量、阻尼参数的取值区间来确定RIDTMD的参数。在一个51层的框架核心筒结构上设计了RIDTMD,分析其在地震激励下的楼层位移、加速度和层间位移角等结构响应,频域与时程分析结果看,以调谐质量阻尼器(tuned mass damper,TMD)控制效果为目标的H_(2)优化设计可以使RIDTMD有着与TMD类似的振动控制效果,与无控结构相比,顶层峰值位移、均方根位移最大可分别降低18.0、32.9%,且RIDTMD的调谐质量比TMD减少30.0%。
文摘近年来,国际上不同国家和地区有关风荷载计算的规范均有不同程度的更新迭代,为了研究规范中风荷载及风致加速度计算参数的差异影响,以联邦航空咨询委员会(Commonwealth Advisory Aeronautical Research Council,CAARC)提出的简单标准模型试验为例,对不同国家和地区的矩形高层建筑顺风向风荷载及风致加速度进行对比研究。首先,对不同规范给定的风场特性及风场参数进行了详细分析;随后,将不同规范中的风荷载和风致加速度计算公式归一化处理;最后,结合风洞试验结果,详细讨论参考风速、湍流强度、湍流积分尺度、峰值因子、背景响应因子、共振响应因子、阵风响应因子的差异及其对风荷载及风致加速度的影响。结果表明:风场参数的差异是造成高层建筑顺风向风荷载和风致加速度不同的决定性因素。
