摘要
针对某高速公路桥梁部分圆截面独柱墩顶部因螺旋钢筋缺失而开裂的情况,利用有限元软件ANSYS建立独柱墩模型,详细分析独柱墩在桥梁竖向荷载作用下其顶部混凝土表面的应力分布特征。通过计算分析,发现盆式支座下座板角点对应混凝土表面的竖向路径为最大主拉应力线的位置,且在桥梁最大竖向荷载作用下,有约17cm长度范围的混凝土主拉应力值超限。根据独柱墩顶部混凝土开裂的特点,选用预应力钢套管加固技术对该桥所有独柱墩进行维修加固。通过在ANSYS中对独柱墩加固区域表面施加均布压力来模拟钢套管对独柱墩的作用。结果表明,钢套管预应力的施加可有效减小独柱墩混凝土表面的主拉应力值,具有较好的维修加固效果。
For the cracking of the top of single column pier of a expressway bridge circular section due to the loss of spiral reinforcement,the model of single column pier is established by using the finite element software ANSYS, and the stress distribution characteristics of the top concrete surface of single column pier under the vertical load of the bridge are analyzed in detail.It is found that the vertical path corresponding to the concrete surface of the bottom plate corner of the basin type support is the position of the maximum main tensile stress line, and under the maximum vertical load of the bridge, the main tensile stress value of the concrete exceeds the limit by about 17 centimeter.According to the cracking feature of these single column piers, prestressed steel sleeve strengthening technique was picked.Uniform pressure was put on the concrete surface of corresponding strengthening section of the single column pier to simulate the action of steel sleeves, and it was found that the prestress of steel sleeves could effectively lower principal tensile stress on the concrete surface of single column piers and thusly an evident strengthening result can be achieved.
作者
金世安
刘其伟
JIN Shian;LIU Qiwei(Jiangsu Yangtze Bridge Co., Ltd.,Jingjiang 214521, China;School of Transportation, Southeast University, Nanjing 210096, China)
出处
《现代交通技术》
2019年第2期36-39,共4页
Modern Transportation Technology
关键词
圆截面独柱墩
开裂
主拉应力
预应力钢套管
single column pier of round section
cracking
principal tensile stress
prestressed steel sleeve
