基于数字孪生的船撞桥梁抢险施工风险分析  

Risk Analysis of Emergency Construction of Ship Collision Bridge Based on Digital Twin

作　　者：吕升林 贺志勇[1] 符锌砂[1] Lv Shenglin;He Zhiyong;Fu Xinsha(Civil and Transportation School,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学土木与交通学院,广州510640

出　　处：《科技通报》2024年第1期91-100,共10页Bulletin of Science and Technology

基　　金：国家自然科学基金资助项目(51978283)。

摘　　要：船撞桥梁抢险施工风险控制研究较少,本文依托某船撞桥梁抢险施工,首先分析发生上部结构连续垮塌二次事故风险,接着分析抢险施工振动和地震作用等风险;建立基于数字孪生的船撞桥梁抢险施工风险控制平台,结合桥墩、盖梁水平位移与沉降监测结果进行预测分析。结果表明:船舶撞击力远大于立柱抗剪承载力1717.9 kN,立柱底出现塑性铰,当立柱顶沉降达2.6 cm时将存在上部结构滑落风险,亟须加固并进行动态监测;抢险施工插打钢管桩振动速度远小于《爆破安全规程》规定的振动速度,施工振动对立柱影响较少,但墩柱受损后抗震性能显著降低,当地震波峰值达11.148 GAL或以上时,立柱底部产生的最大轴力均大于轴向受压承载力11027.78 kN,存在严重安全隐患;通过改进小波去噪的灰色LSTM(long short-term memory)组合模型进行预测,得到未来3、5、7 d沉降变化预测结果,相对误差均在15%之内,与实测监测结果基本一致;采用人工干预可以实现物理实体和虚拟孪生体的双向交互,确保抢险施工安全。There are few studies on the risk control of ship collision bridge rescue construction.Relying on a ship collision bridge rescue construction,this paper firstly analyzes the secondary accident risk of continuous collapse of superstructure,and then analyzes the risk such as vibration and earthquake in rescue construction.The risk control platform of ship collision bridge construction based on digital twin was established,and the prediction analysis was carried out based on the monitoring results of horizontal displacement and settlement of pier and cover beam.The results show that the ship's impact force is far greater than the shear capacity of the column of 1717.9 kN,plastic hinge appears at the bottom of the column,when the column top settlement reaches 2.6 cm,there will be a risk of superstructure slip,urgent reinforcement and dynamic monitoring.The vibration velocity of steel pipe pile during emergency construction is far less than that stipulated in the Blasting Safety Regulations,and the impact of construction vibration on the column is less,but the seismic performance of the pier column is significantly reduced after damage.When the peak value of seismic wave reaches 11.148 GAL or above,the maximum axial force generated at the bottom of the column is greater than the axial bearing capacity of 11027.78 kN.There are serious safety risks;Through the improved wavelet denoising grey LSTM(long short-term memory)combination model,the settlement change prediction results for the next three days,five days and seven days are obtained,and the relative errors are all within 15%,basically consistent with the measured monitoring results.Using manual intervention can realize the two-way interaction between physical entity and virtual twin to ensure the safety of emergency construction.

关 键 词：数字孪生 船撞桥梁 抢险施工 LSTM 风险控制 

分 类 号：U447[建筑科学—桥梁与隧道工程]