A simplified multi-iteration method for restrained beams under fire

作者：Lu Limin^*; Yuan Yong; Annerel Emmanuel; Taerwe Luc

来源：Materials and Structures, 2015, 48(1-2): 9-19.

DOI：10.1617/s11527-013-0164-8

• Restrained members
• Elevated temperature
• Moment-curvature curve
• Fire-behaviour
• Equivalent bending stiffness

Separate members of a reinforced concrete (RC) structure always experience various axial and rotational restraints from other members. These restraints can have significant influence on the flexural behaviour of RC members at elevated temperatures. This is a very complex effect of the fire performance analysis for which finite element packages have to be applied. Thus a simplified analysis method for fire performance of restrained RC members is needed. Based on the mechanical properties of concrete and reinforcing steel at elevated temperatures, a multi-iteration analysis method is proposed, and an equivalent bending stiffness is defined in the multi-iteration method for the structural analysis. This paper gives an introduction to the proposed numerical model and its verification process by fire tests on restrained one-way slabs. The model is applied to RC elements with various rotational restraints.

• 出版日期2015-1
• 单位同济大学