由于斜柱整体较长、自重大且受施工条件的限制,项目施工采用分批分级的临时支撑体系到斜柱结构体系的受力置换施工方法。为保证置换过程中斜柱的受力安全,运用自行搭建的斜柱置换监测平台对12和13轴斜柱在置换过程中的斜柱轴力、斜柱内型钢应变和钢筋应力进行实时监测。采用ABAQUS有限元软件模拟分析了置换作用下型钢和钢筋的应力变化,并将模拟值与监测值进行了对比分析。结果表明:12和13轴斜柱在置换过程中的轴力变量均较小;斜柱的型钢应变变量最大不超过26.99×10-6,钢筋应力变量最大不超过4.75 MPa;各部件应力均在较小的范围内波动且数值较小,有限元模拟计算值与监测值的变化趋势基本一致,且两者数值相差较小,表明所建立的斜柱有限元模型能较好的反映置换过程中斜柱的受力变化。
Due to the great overall length and self-weight of the inclined column, and the limitation by the construction conditions, the batch construction method of the structural system transform from the temporary support system to the inclined column structure system was adopted in the project. To ensure the safety of the inclined column during the transform proces, the self-built transform monitoring platform was used to real-time monitor the axial column force, the steel strain and the steel bar stress of the inclined columns on the Axis 12 and Axis 13 during the transform process. The ABAQUS finite element software was used to analyze the stress changes of the steel and steel bars in the inclined columns under the actual displacement load, and the simulated values were compared with the monitoring values. The results show that the axial force variables are small during the transform process. The maximum strain variable of the steel at the measuring point in each inclined column is no more than 26.99×10-6, and the maximum stress variable of the steel bars is no more than 4.75 MPa. The stress of each component fluctuates in a small range and the value is small. The variation trend of the simulation values are basically consistent to the monitoring values. It shows that the established three-dimensional finite element model of the inclined column can better reflect the column stress change in the transform process.
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