摘要
由于偏心结构质量中心与刚度中心不重合,在地震作用下会产生扭转振动,对结构整体抗震性能十分不利。工程设计通常在远离刚度中心的抗侧结构中,采取设置支撑等增加刚度的措施,减小结构的偏心程度。本文采用消能减震技术,在偏心响应较大的抗侧结构中设置消能减震阻尼器,来减小偏心结构的扭转地震响应。论文通过弹塑性时程分析方法,研究了偏心结构、设置普通支撑、设置速度型阻尼器和位移型阻尼器四种结构方案在常遇、设防和罕遇地震作用下的扭转响应,研究了消能减震技术对偏心结构的减震控制效果。分析结果表明,消能减震技术可以有效控制偏心结构的扭转响应,在大震条件下较好的控制主体结构构件的受力。最后本文针对王府井大厦偏心结构工程进行了阻尼消能减震结构的设计。
Earthquake damage investigation reveals that there are spatial vibrations resulting from coupled translation and torsion vibrations in the eccentric structures when earthquake occurs. In conventional construction, braces are typically added to enhance the lateral stiffness and to eliminate eccentricity of the eccentric structures. By introducing the energy dissipation techniques to control the torsion vibration of the eccentric structures under earthquake, seismic response of the eccentric structure, eccentric structure with normal braces, with unbonded braces （UBB） and with fluid viscous dampers under the excitations scaled to minor, moderate and severe earthquakes according to Chinese seismic code is studied by nonlinear response-history analysis method. It is shown that the energy dissipation control devices can significantly reduce the structural response. Further, the seismic performance of WangFuJing Building with energy dissipation hardware is also analyzed.
出处
《工程抗震与加固改造》
2006年第2期78-83,共6页
Earthquake Resistant Engineering and Retrofitting
基金
科技创新工程重大项目培育资金项目(704003)
关键词
偏心结构
扭转振动
时程分析
消能减震
阻尼器
eccentric structure
energy dissipation control
torsion vibration
time history analysis
damper
