【摘要】 针对辽阳市中华大桥局部结构损伤对其承载力影响的问题,通过现场静力试验和损伤检测,得出了系统的现场数据,将该数据与桥梁破坏前的检测数据进行对比,确定结构的主要损伤为预应力T型主梁连接处的肋梁严重破损。用大型三维有限元软件ANSYS中的生死单元技术模拟破坏肋梁,建立了单跨损伤肋梁有限元数值模型,并将有限元数值分析结果与检测值相对比,验证了有限元模型的准确性。最后,采用钢筋焊接填筑混凝土进行补强,以外加钢板法加固损伤肋梁,并建立加固后的有限元模型,分析验证了该加固方法的有效性。更多还原

【Abstract】 In order to estimate the load-carrying capacity of locally damaged Zhong-hua bridge,by using static experiment and damage test method we made sure that the main damage to the bridge is at the ribbon strips of prestressed T-beam.We built a finite element model of damaged ribbon strips by means of"birth ad death"method and proved the model is appropriate by comparing the numerical analysis results with experimental results.Finally,we strengthened the damaged bridge by strengthening concrete and steel plate welding and demonstrated the effectiveness of the strengthening method.更多还原