Moment-Rotation Characteristics for Flexible Beam-to-Column Steel Joint Exposed to Fire

作     者：Mariusz Maslak Michal Pazdanowski Malgorzata Snela 

作者机构：Faculty of Civil Engineering Cracow University of Technology Cracow 31-155 Poland Faculty of Building and Architecture Lublin University of Technology Lublin 20-618 Poland 

出 版 物：《Journal of Civil Engineering and Architecture》 (土木工程与建筑（英文版）)

年 卷 期：2015年第9卷第3期

页      面：257-261页

学科分类：03[法学] 080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0837[工学-安全科学与工程] 0838[工学-公安技术] 0306[法学-公安学] 

主　　题：Steel joint fire temperature flexibility stiffness rotation. 

摘      要：Analytical models used to describe behaviour of steel frame loadbearing structures in fully developed fire usually do not allow for reduced joint stiffness due to increased member temperature. Joints previously designed as nominally rigid tend to become flexible in fire situation, with degree of flexibility increasing during fire development. Reliable analysis of this phenomenon and its influence on the redistribution of internal forces result in the need for developing appropriate characteristics, describing relationship between bending moment applied to the joint and joint rotation. Characteristics of such type, specified for fire conditions, depend on steel temperature, in the current work, the authors propose a practical approach to develop such characteristics, based on the knowledge of analogous characteristic prepared for persistent design situation. The developed technique does not require to generalize the classical component method to the case of fire, which may be difficult in practical situations. The proposed computational algorithm has been tested on an example of a typical beam-to-column joint.