基于应变监测的基坑钢筋混凝土支撑轴力修正方法
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TU375.4

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Study on force correction method of reinforced concrete brace shaft in foundation ditch based on strain monitoring
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    摘要:

    支撑轴力是验证基坑支撑体系安全与否的一项重要指标,对施工期的基坑安全判定具有重要的意义。现场的支撑轴力监测数据反映出明显脱离实际的现象,轴力监测数据常大幅超出实际安全设计值,难以作为施工期安全监测的有效指标。考虑非荷载因素对钢筋混凝土支撑应变数据的影响,选择CEB90模型为例,进行应变的修正,给出相应的计算理论和方法,并对实际的支撑监测数据进行轴力修正,对比修正前、后轴力变化。结果表明:非荷载因素对轴力监测有很大的影响,现场钢筋混凝土支撑轴力监测应该考虑非荷载因素进行修正。

    Abstract:

    The axial force of braces is an important index to verify the safety of foundation ditch supporting system, and it is of great significance to the safety judgment of foundation ditch during construction. But the monitoring data of the braces axical force in the field is obviously divorced from reality, and the axial force data monitored often exceeds the actual safety design value several times, so it is difficult to be an effective indicator of safety monitoring. Considering the influence of non-load factors on the strain data of reinforced concrete support, the CEB90 model is chosen as an example to correct the strain, and the corresponding calculation theory and method are put forward. The axial force of the actual support monitoring data is corrected, and the axial force changes before and after the correction are compared. The results show that the non-load factors have a great influence on the axial force monitoring, which indicates that the non-load factors should be considered in the monitoring of the axial force of the reinforced concrete braces.

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肖振烨,李素贞,崔晓强.基于应变监测的基坑钢筋混凝土支撑轴力修正方法[J].重庆大学学报,2018,41(11):8-18.

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  • 收稿日期:2018-06-12
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  • 在线发布日期: 2018-12-01
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