Simplified Calculation Method of Elastic plastic Displacement Capacity for Double column Bent

Abstract:

Based on the current research for ductility capacity of single column pier, a simplified calculation method of elastic plastic displacement capacity for double column bent was obtained by analyzing the effects of dynamic axial force and plastic hinge mechanism on the elastic plastic displacement capacity of double column bent. With the proposed simplified calculation method of double column bent, the obtained yield tip pier displacement was larger than that calculated by pushover analysis and the accuracy was within the acceptable range. When the axial compression ratio was within 5%~20% and the slenderness ratio was within 5~10, the calculated tip pier collapse displacement was within 20%. With the increasing of the slenderness ratio and the decreasing of axial compression ratio, the tip pier collapse displacement by the proposed simplified calculation method was less than that by pushover, therefore, the proposed simplified calculation method was safe.

Key words:double-column bent; dynamic axial force; plastic hinge mechanism; pushover analysis; elastic-plastic displacement capacity