双柱墩弹塑性位移能力简化计算方法

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

在目前单柱墩延性能力研究的基础上,通过分析动轴力和塑性铰机制对双柱墩弹塑性位移能力的影响,得出双柱墩弹塑性位移能力简化计算方法,并对该简化计算方法进行误差分析.结果表明：双柱墩墩顶简化计算屈服位移较推倒（Pushover）分析的屈服位移略大;当双柱墩轴压比为5％～20％、长细比为5～10时,简化计算破坏位移误差在20％内.随着长细比的增加和轴压比的减小,简化计算墩顶破坏位移小于Pushover分析的破坏位移,因此该简化计算方法的结果是偏安全的.

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 2nd the accuracy was within the acceptable range. When the axial compression ratio was within 5 % -0% 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.