考虑应变硬化的水电站压力钢管整体安全评估

摘要

本文提出了考虑材料应变硬化的水电站压力钢管整体安全评估方法,该法引入以整体安全系数为评估指标的承载力极限状态方程,依据ASME压力容器管道与规范中考虑应变硬化的钢材本构模型,采用弹塑性分析求解考虑应变硬化后的结构极限承载力和结构整体安全系数,参照国内外压力钢管设计规范拟定了结构整体安全系数限值,形成了可成套应用的结构整体安全评估方法.研究表明,该法可为压力钢管承载力安全评估提供新途径,并可用于优化压力钢管结构设计方案.%A method for integral safety evaluation on steel penstock under the consideration of strain-hardening effect is put forward herein. The integral safety coefficient is introduced into this method as the evaluation indexes for the bearing capacity limit state equation , and then the elasto-plastic analysis is taken to solve both the ultimate structural bearing capacity and the integral safety factor after the consideration of the strain-hardening. Furthermore, the limit value of the structural integral safety factor is determined in accordance with the related design codes and specifications for penstock at home and abroad and a structural integral safety evaluation method , which can be applied in a complete set, is finally formed as well. The study shows that this method can provide a new way for the safety evaluation on bearing capacity of penstock.