Study on Measurements of Creep and Shrinkage of Composite Structures, Construction of Database as well as Their Applications

1993年至1994年共举行了5次会议，稳步开展了与本研究有关的研究工作。首先，对6个矩形钢管混凝土试件进行了徐变收缩试验，经过近一年的测试，已基本完成。建立了数值分析的流变学方法，绘制了预测曲线，并将其应用于实际数据。此外，由于有机会进行组合梁板(预制或现浇板)收缩徐变试验，因此有可能将这些结果纳入本研究。其次，使用为本研究目的而获得的Paradox 4.0J软件，建立了以下2个关于组合结构徐变和收缩的数据库。第一个重点是已经登记的参考文献的测量日期，其结构使论文的摘要、结果和关键字、作者姓名和从属关系可以通过个人计算机方便地获取。另一个包括本研究的结果，包括组合结构构件的徐变系数和收缩量，并以类似的方式允许通过个人计算机访问它们。为了对实际设计有所帮助，图解数据库对各种设计规范进行了比较，并根据新的理论公式，对体外拉索组合梁的徐变和收缩应力和变形进行了分析。经过多次分析，从多个角度对其适用性进行了探讨。

A total of 5 meetings were held in 1993 through 1994, in which study works concerning the present research was steadily carried out. The following lines summarize their contents :Firstly, an experiment on creep and shrinkage was carried out on 6 specimens of concrete filled rectangular pipes, being almost completed after its almost one year's measurements. A rheological method for numerical analysis was developed and the prediction curves were completed to apply to the practical date. In addition, an opportunity of executing an experiment on creep of the slabs (either precast or cast in-situ)of composite girders due to the shrinkage of the slab, made it possible to include these results in the present research.Next, using Paradox 4.0J,a software acquired for the purposes of the present research, the following 2 date base concerning creep and shrinkage of composite structures were constructed. The first one, focusing on the measured date of the already registered references, was constructed so that abstracts, results and keywords of the papers, author names and affiliation, can be easily accessed through a personal computer. The other, included the results of the present research, for the creep coefficients and amount of shrinkage of elements of composite structures, and in a similar way, allowed to accessed them through a personal computer. In order to help in the actual design, the graphic date base presents comparisons with the various design specifications.In addition, as applicationn to the above results, analysis of stress and deformation due to creep and shrinkage of composite girders with extemal cables were carried out, based on a new theoretical formulation. After a number of analysis, its suitability from various points of view were discussed.