基于有限元分析的大跨度钢结构累积滑移过程研究

Research on the Cumulative Slip Process of Long-Span Steel Structure Based on Finite Element Analysis

为较真实地反映大跨度钢结构滑移过程中的应力应变情况,通过有限元软件对钢结构累计滑移过程的不同阶段进行了模拟分析。结果表明,钢结构滑移过程中的受力最大区域位于加载点周边轨道局部范围上,采用双拼轨道梁体系的最大应力大于单拼轨道梁体系,为206.4 MPa;位移最大区域位于轨道与网壳直接连接点处,双拼轨道梁体系的最大水平位移小于单拼轨道梁体系,为13.346 mm。滑移过程中,各跨轨道梁均呈先减小后增大的应变变化趋势,但远低于预警值。在此基础上,本研究提出了一种安全有效的大跨度钢结构滑移施工方案,为今后类似施工工程提供了参考和借鉴。

In order to truly reflect the stress and strain in the sliding process of long-span steel structure,the different stages of cumulative sliding process of steel structure were simulated and analyzed by finite element software.The results showed that the maximum stress area of the steel structure in the sliding process was located in the local range of the track around the loading point.The maximum stress of the double track beam system was 206.4 MPa,greater than that of the single-track beam system.The maximum displacement area was located at the direct connection point between the track and the reticulated shell.The maximum horizontal displacement of the double track beam system was 13.346 mm,less than that of the single track beam system.During the sliding process,the strain of each span track beam decreased first and then increased,but it was far lower than the early warning value.Therefore,a safe and effective sliding construction scheme of long-span steel structure is proposed,which provides a reference for similar construction in the future.