正交异性整体钢桥面建模分析方法对比

正交异形钢桥面板的常用建模分析方法包括空间杆系法(SF)、空间板梁法(SPB)以及空间板壳法(SP),采用各种方法进行分析时的计算量与计算精度各有优劣,有必要进行对比研究。以一座连续钢桁梁柔性拱桥正交异性钢桥面节段为对象,结合现有规范分别建立了SF,SPB以及SP计算模型,并对3种建模方法与分析结果进行对比。研究结果表明:3种建模方法的受力行为较为接近;SPB模型的应力峰值更大,模型刚度也更大;依据现有规范中有效宽度建立的SF模型的横梁应力分析结果与其他2种模型存在较大差异,横梁有效宽度取值方面有待进一步研究。

Comparation on Modeling and Analysis Method of Orthotropic Steel Bridge Deck

The common modeling and analysis methods used for orthotropic steel bridge deck are spatial frame method(SF),spatial plate and beam method(SPB),and spatial plate method(SP).The comparative study of these methods is necessary because each method has both advantages and disadvantges on computation cost and accuracy.In this paper,an orthotropic steel deck segment of a continuous steel truss-flexible arch composite bridge was taken as the research object.The SF,SPB,and SP analysis models were established respectively.The analysis results were analyzed and compared.The results show that the mechanical behavior of the three modeling methods are relatively close.The stress peak value and the total stiffness of the SPB model are larger.The stress of the diaphragms in the SF model is quite different from that in the other two models,indicating that the diaphragms’effective width in SF method needs further study.