某多跨框架结构托梁抽柱工过程仿真分析

Simulation Analysis of Joist and Column Extraction Construction Process of a Multi Span Frame Structure

基于山东某发电厂的扩跨改建加固项目,结合施工工艺设计了托换梁位移监测方案和钢筋应力监测方案,通过对模型细部处理及加载过程的设置,建立有限元分析模型,实现了对托梁抽柱全过程模拟。将模拟结果与监测结果对比发现:西支座处13号、16号点模拟钢筋应力误差为2.9%、2.5%;东支座处1号、5号点应力模拟误差为9%和14%;跨中7号点应力模拟误差为16%;托换梁跨中实际最大位移为8.3 mm,模拟所得为7.95 mm,两者误差为4.2%。结果表明,该仿真分析方法适用于大跨度混凝土框架结构托梁抽柱改造中,仿真结果具有较高可信度。

Based on the span expansion,reconstruction and reinforcement project of a power plant in Shandong,combined with the construction technology,the displacement monitoring scheme of underpinning beam and reinforcement stress monitoring scheme are designed.The finite element analysis model is established,and the whole process of joist and column extraction is simulated through the detailed treatment of the model and the setting of the loading process.Comparing the simulation results with the monitoring results,it is found that the stress errors of simulated reinforcement of point 13 and 16 at the West support are 2.9%and 2.5%;The stress simulation errors of point 1 and 5 at the East support are 9%and 14%;The stress simulation error of point 7 in the middle of the span is 16%;The actual maximum displacement in the mid span of underpinning beam is 8.3 mm,and the simulation result is 7.95 mm,with an error of 4.2%.The results show that the simulation analysis method is suitable for the transformation of joist and column of long-span concrete frame structure.The simulation results have high reliability.