摘要
利用各种材料的弹塑性应力—应变关系求解结构任意截面的弯矩—曲率关系是桥梁结构延性抗震分析的关键所在。针对钢筋混凝土矩形桥墩,将纵向钢筋等效为钢环,将截面等效分解为多个截面的组合体,推导出了计算弯矩—曲率关系(M-φ曲线)的简便计算公式;结合分段近似求解位移的计算公式,利用C语言编制了P-Δ曲线的计算程序。通过理论计算与荷载试验结果的比较分析,不但证明了简便计算方法的精确性和实用性,还初步探讨了不同类型的材料应力—应变关系对桥墩弹塑性力学分析结果的影响,验证了我国现行《公路桥梁抗震设计规范》中建议的材料模型的可靠性。
It is a key to get any sections＇ moment-curvature curve by using material＇s elastic-plastic stress-strain relation for bridge structure＇s anti-seismic ductility analysis. To the reinforced concrete bridge piers with rectangle section, the new M-9 curve calculation formulas are given by simulating all the vertical steels as a steel ring and simulating the section as a combination of several sections. Combining with dis- placement approximation calculating formulas, a P-＆curve calculating program is made by C language. Through the calculation and comparison with some experiments, not only the accuracy of new calculation methods is proved, but also a preliminary discussion for material stress - strain relations and its effects in this simulation calculation is made, the reliability of material model given by China＇s current Highway Bridge Seismic Design Specifications is proved too.
出处
《公路》
北大核心
2010年第10期20-27,共8页
Highway
关键词
桥梁工程
延性
仿真计算
钢筋混凝土矩形桥墩
M-Φ曲线
P-Δ曲线
材料模型
bridge engineering
ductility
simulation calculation
RC bridge pier with rectangle section
M-9 curve
P-A curve
material model
