Study on the design technique of reinforced concrete deck at intermediate supports of continuous steel-concrete composite girders

研究了钢-混凝土连续组合梁中支座钢筋混凝土桥面板的设计技术。(a)建立了考虑部分相互作用的钢-混凝土组合梁有限元模型。利用Maple和MATLAB编制了徐变收缩应力和变形计算程序，并进行了参数化计算。并对徐变收缩进行了二维有限元分析（MARC），与部分相关组合梁理论的计算结果进行了比较。(b)对聚合物浸渍混凝土（PIC）钢筋混凝土梁进行了极限性能和裂缝分析，研究了PIC对延性的影响以及使用极限水平的裂缝控制设计。此外，还对由PIC、现浇混凝土和系杆组成的系杆拱型组合板进行了研究，发现系杆拱型组合板是一种较好的组合板结构。(c)出于降低工程造价的需要，采用两主梁支承的连续组合梁设计具有一定的实用价值。本文对连续组合梁的设计准则、实际设计中存在的问题及对比计算结果提供了表格数据。结合欧洲规范对连续组合梁中间支座开裂区混凝土刚度进行了计算。

This study focused on the design technique of reinforced concrete deck at middle supports of continuous steel-concrete composite girders.(a) Finite element for the steel concrete composite girder with partial interaction was formulated. Computer program for stress and deformation by creep and shrinkage was developed by Maple and MATLAB, and then parametrical computation were performed. Furthemore, two dimensional FE analysis(MARC) for creep and shrinkage analysis was carried out, and cpmpared with the results by partial interaction composite girder theory.(b) The ultimate behavior and crack analysis of reinforced concrete beam with polymer impregnatged concrete(PIC) were carried out, and the effect of ductility by PIC and crack control design at service limit level were studied. Furthermore, tied arch type composite slab composed of PIC, cast-in-place concrete and tie bar was investigated, it was found that tied arch type composite slab was favorable structures compared with the normal reinforced concrete slab.(c) For the reason of demand to reduce constructional costs, it is valuable to design the continuous composite girder supported by 2 main girders. In this study, data on table about the design criteria of continuous composite girder, the problems in actual design and the results of comparative calculation were offered. Furthemore, concrete stiffness of cracking zone at intermediate supports of continuous composite girder wes ealuated in considered to Eurocode.