Abstract: According to the requirement of bridge engineering , a equivalent element group model of elastoplastic beam is presented . This equivalent eminent group is composed of a beam element and a truss element group. The formulas are deduced according to the load-deformation curve of the elastoplastic beam . This equivalent element group model of elastoplastic beam is used on the piers of a bridge ,and the seismic responses are calculated out.

Key words: finite element rnethod, elastoplastic beam, equivalentelement group , earthquake

摘要： 根据桥梁工程的实际需要,提出采用一个梁单元和一个杆单元组串联而成的等效单元组来模拟平面弹塑性梁,并推导了根据弹塑性梁的荷载一位移曲线求等效单元组参数的有关公式. 最后、在某桥的桥墩上采取笔者提出的等效单元组模型,计算了该桥的弹塑性地震响应

关键词: 有限元, 弹塑性梁, 等效单元组, 地震