【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。更多还原

【Abstract】 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-φ 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 displacement approximation calculating formulas,a P-Δcurve 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.更多还原