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为了确保港珠澳大桥超大节段钢箱梁整体吊装施工的安全,利用有限元软件Ansys建立钢箱梁及吊具的整体有限元模型,提出合理的吊装监测方案,采用实际吊装构件、分级加载方式对吊具开展静载监测试验,将测点的理论应力值与实测推算应力值对比分析,计算结果与监测试验中的测点应力值吻合良好;试验和有限元的分析结果均表明:钢箱梁在吊装过程中,吊具各构件的强度、刚度及稳定性均满足要求,在不大于额定荷载作用下,整体结构安全可靠,可投入钢箱梁的实际吊装作业中。
In order to ensure the safety of the whole hoisting construction of the large-section steel box girder of Hong Kong-Zhuhai-Macao Bridge, the finite element software Ansys is used to establish the overall finite element model of the steel box girder and spreader, and a reasonable hoisting monitoring plan is proposed. Way to carry out static load monitoring test on the spreader, comparing the theoretical stress value of the measuring point with the actual measured stress value, and the calculated results are in good agreement with the measuring point stress value in the monitoring test. The results of the experiment and the finite element analysis show that the steel During the process of hoisting, the strength, rigidity and stability of each component of the spreader meet the requirements. Under the condition of not more than the rated load, the whole structure is safe and reliable, and can be put into practical hoisting operation of the steel box girder.