摘要
建筑结构在爆炸荷载作用下的连续倒塌问题近些年被很多学者所关注。从本质上讲,结构的抗倒塌和抗震都是动荷载作用下的结构响应问题,因此,结构抗震设计的很多理念对结构的抗连续倒塌设计同样适用。本文采用数值模拟的方法,分别对按抗震设防烈度Ⅵ度、Ⅶ度和Ⅷ度的钢框架结构进行了40kg炸药爆炸作用下的连续倒塌分析,探讨了抗震设防烈度对钢框架连续性倒塌的影响。计算结果表明,抗震设防烈度高的钢框架结构其抵抗连续倒塌的能力较强。其中,按Ⅵ度设防的结构发生了连续倒塌;按Ⅶ度设防的结构没有发生连续性倒塌,只发生了一定程度的变形和破坏;而相比之下,按Ⅷ度设防的结构变形和破坏最为轻微。
The progressive collapse of buildings under explosion has attracted lots of attention from researchers in recent years.Structural collapse resistance and seismic resistance essentially belong to same issue of structural response under dynamic loading.Therefore,some theories in structural seismic design are also applicable to the design to resist progressive collapse.By applying numerical simulation,we have conducted a series of analysis on the progressive collapse under internal explosion of explosive charges of 40kg to the steel-frame buildings within regions of the seismic fortification intensity of VI,VII and VIII degrees respectively,and then investigated the effect of seismic fortification intensity on the progressive collapse of steel-frame buildings.The results indicate that the steel-frame building within the region of seismic fortification of higher degree has stronger capacity to resist progressive collapse than those without fortification.In details,the building with VI of anti-seismic design collapsed,while the building with VII of anti-seismic design did not collapse,but suffered deformation and damage to some extent.In contrast,the building with VIII of anti-seismic design only had minor deformation and damage.
出处
《震灾防御技术》
2010年第2期176-184,共9页
Technology for Earthquake Disaster Prevention
基金
国家自然科学基金重点项目(50638030)
国家"十一.五"科技支撑项目(2006BAJ13B02)
关键词
设防烈度
钢框架
连续倒塌
数值模拟
Seismic fortification intensity
Steel-frame
Progressive collapse
Numerical simulation
