钢筋混凝土框架结构抗连续倒塌设计方法的研究

STUDY ON DESIGN METHOD TO RESIST PROGRESSIVE COLLAPSE FOR REINFORCED CONCRETE FRAMES

首先简要介绍了国外抗连续倒塌设计规范的主要设计方法和分类设计体系,然后重点对钢筋混凝土框架结构抗连续倒塌拆除构件设计法和拉结强度设计法进行较为深入的分析研究。在基于非线性动力分析的拆除构件设计法进行分析的基础上,对基于线弹性静力分析的拆除构件法的原理和设计参数进行了分析和验算,提出适合我国工程结构的设计参数。分析了国外规范拉结强度设计法应用于按我国规范设计的框架结构的不适用性及其原因,并对国外规范拉结强度设计法中基本拉结强度的计算模型所存在的不足进行了改进,提出了考虑空间传力路径等因素的拉结强度设计法。通过算例对该文建议的线弹性静力拆除构件设计法和拉结强度设计法进行了设计验证。

This paper summarizes the major design methods and classification-design systems in foreign codes to resist progressive collapse. And then the alternate path （AP） method and tie force （TF） method in the progressive design for reinforced concrete （RC） frames are studied. Firstly, based on the analyzing the nonlinear dynamic AP method, the principle and design factors of the linear static AP method are analyzed, and moreover, design factors suitable for Chinese structures are suggested. Secondly, the inapplicability of the TF method in foreign codes to enhance Chinese RC frames is studied. The calculating model of foreign TF method is improved and a TF method considering space load paths is suggested. Both the linear static AP method and the TF method suggested by this paper are verified by design.