摘要
为使拱桥达到理想的成桥状态,结合岭兜特大桥工程,对采用预制拱肋、缆索吊装施工的钢筋混凝土箱形拱桥,利用结构有限元分析,根据倒装-正装计算法对施工过程中结构的受力特性和变形进行预测,施工控制中对主拱的应力、线形、扣索的索力等进行监测。结果表明:在拱肋吊装过程中拱轴线变化与计算一致,拱肋合龙后各控制点的实测高程与控制高程之差、轴线偏位均满足相关规范要求;主拱圈典型截面上的实测应力值与计算应力值接近;扣索实测索力与计算索力基本吻合,岭兜特大桥达到了理想的成桥状态。
To ensure that arch bridges could ultimately reach their ideal finished bridge state, the Lingdou Bridge was cited as an example. The finite element method was used to analyze the reinforced concrete box arch bridge which had prefabricated arch ribs and were constructed by cable hoisting erection. The load bearing performance and deformation of the structure during the construction process were predicted by the reversal construction-normal construction computing meth- od. In the construction control, the stress, geometrical shape of the arch ribs and the cable forces of the fastening cables were monitored. The results indicated that the variation of the arch axis during the hoisting of the arch ribs were consistent with the computing results, and when the arch ribs were closed, the difference between the measured elevation of each controlled point and the controlled elevation and the offsetting of the arch axis all met the relevant code requirements. The stress values measured from the typical sections of the main arch ribs were approximate to the calculated values. The measured cable forces of the fastening cables and the calculated values were basically agreed. Hence, the Lingdou Bridge reached its ideal finished bridge state.
出处
《世界桥梁》
北大核心
2013年第4期35-38,共4页
World Bridges
关键词
拱桥
箱形拱肋
钢筋混凝土
缆索吊装
应力
施工监控
arch bridge
box arch rib
reinforced concrete
cable hoisting erection
stress
construction monitoring and control
