作　　者： ; ; ; ;

机构地区： 上海市建筑科学研究院集团有限公司

出　　处： 《建筑科学》 2013年第9期8-12,共5页

摘　　要： 数值模拟是研究建筑结构火灾下连续倒塌行为的重要方法。火灾作用下,在结构出现构件失效,进入连续倒塌过程之前,其响应为一准静态过程。而当构件失效,结构开始连续倒塌后,其响应为动态过程。传统结构火灾分析多基于静力方法,不能反映连续倒塌过程中动力因素的影响;而由于结构受火时间很长,完全采用动力分析方法计算量过大。为解决这一矛盾,本文在传统动力方法的基础上,通过引入计算时间比,将较长的真实受火作用时间转化为较短的虚拟动力作用时间,进而可以很大程度上减少火灾作用动力分析的计算工作量。利用该等效时间方法对平面钢筋混凝土框架的实例进行了分析,并讨论了计算时间比和计算效率的关系。 Numerical simulation is an important method to investigate the fire-induced progressive collapse of building structures. The mechanical response of fire-induced progressive collapse of building structures is quasi-static and dynamic before and after the break of structural elements caused by fire respectively. So the traditional fire resistance analysis using the static analysis cannot capture the dynamic effect of progressive collapse; whilst the conventional dynamic method is also difficult for the simulation of fire-induced progressive collapse because of the huge unnecessary computing workload in accordance with the long time fire action. In this paper, a computing time ratio is introduced in the conventional dynamic method to transform the long fire acting time into the short virtual dynamic time. By this way, the computing time of dynamic analysis on the fire action is reduced significantly by the equivalent time method. At last, an example of a planar RC frame is analyzed by using the equivalent time method and the relationship between the computing time ratio and the computing efficiency is investigated.

关 键 词： 火灾 连续倒塌 数值模拟 等效时间方法 计算时间比

领　　域： [建筑科学] [建筑科学]