冲击与火载荷作用下约束构件的响应和屈曲研究

项目名称： 冲击与火载荷作用下约束构件的响应和屈曲研究

项目编号： No.11272189

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 席丰

作者单位： 山东建筑大学

项目金额： 88万元

中文摘要： 基于结构抗火和抗爆工程背景，以端部具有弹性约束的梁、柱构件作为研究对象，开展结构在爆炸和火作用下的响应机制研究，重点考察构件响应与屈曲行为的端部约束效应。研究内容和手段为：（1）以有限变形动力学中的最小加速度原理为基础，建立爆炸、冲击和火载荷作用下结构行为分析的统一计算模型，该模型考虑大挠度、应变率、热膨胀变形和温度软化效应，构建钢梁动力响应和钢柱屈曲数值模拟的有限差分法，以能够充分描述钢构件受火和冲击作用下的大挠度行为和悬链线效应，从而开展准确有效的响应行为评估和临界温度、爆炸极限预测；（2）对于具有刚性、半刚性和柔性三种连接类型的框架结构，通过有限元模拟和实验量测，讨论连接效应，以分析不同的约束刚度对于框架中梁、柱行为的影响。通过上述两方面对约束构件和框架行为模拟与实验分析的综合比较及比拟研究，阐明约束刚度与火和冲击共同作用下结构极限温度的关系，为结构抗火和抗爆简化计算提供参考依据。

中文关键词： 约束构件；冲击；火；动力响应和屈曲；临界温度

英文摘要： Based on the engineering background of structural fire resistant and blast resistant design, the steel members with elastic restraint such as beams and columns are taken as the objects of study, the response and failure behavior of the structures under blast and fire loading is going to be investigated, the focus of research is on the restraint effects for the response and buckling behavior of steel members. In order to carry out accurate and effective response assessment and the critical temperature prediction, an united computing model for the response of restrained beams and columns under blast and fire is going to be established by using the minimum principle of acceleration in dynamics of elastic-plastic continua at finite deformation, the effects of the large deflection, strain rate and thermal expansion deformation will be included, in coordination with the constitutive equations related to temperature, then the finite difference technique can be presented, the large deflection behavior and catenary action effects of the steel members under impact and fire loading can be adequately expressed by this method. To further analyze the influence of constraint stiffness on the behaviour of beams and columns, finite element simulation and the experiment analysis will be implemented for the frame structures with t

英文关键词： restrainted member；impact；fire；dynamic response and buckling；critical temperature