中文摘要：

目前国内外有代表性的混凝土收缩变形预测模型中，关于构件尺寸和截面形状对混凝土收缩影响的考虑不尽一致，因此定量研究这两种因素的影响具有价值。对理论厚度分别为50mm、100mm、200mm的矩形和箱形截面共6组18个混凝土试件的收缩变形规律进行了试验和分析，结果表明：试件尺寸同时影响混凝土收缩终值和收缩发展速度，尺寸越大，各龄期收缩值越小，收缩发展越慢；对于试验的箱室完全封闭的箱形截面试件，其收缩值和发展速度小于相应实心构件是由于封闭箱室的实际理论厚度较大所致，计算其实际理论厚度时应对箱室内表面周长进行修正，修正系数可取0．45。根据试验结果对我国现行公路桥规的收缩预测模型进行了修正，该文和相关文献的试验结果验证了修正公式的适用性。

英文摘要：

Among those representative models on concrete shrinkage deformation prediction in the current domestic and international design codes, there exists some controversy about the effect of concrete component size and cross-sectional shape on the shrinkage deformation, thus a quantitative study about the effect is crucial to reduce the uncertainties in the models. The experimental study was conducted on the shrinkage deformation of 18 concrete specimens, with 3 different theoretical thicknesses of 50mm, 100mm and 200mm and 2 different cross-sectional shapes of solid rectangle and hollow box, respectively. The results show that both the ultimate value and the development rate of concrete shrinkage are affected by the theoretical thickness or size of the specimens, the larger the size, the smaller the deformation and the lower the development rate of the concrete specimen shrinkage. For those hollow box specimens sealed at both ends, both their shrinkage deformation and development rate are lower than those of corresponding solid rectangle specimens with the same theoretical thickness, which results from those hollow box specimens having a larger theoretical thickness actually due to a sealed box cell. The shrinkage deformation of the hollow box specimens can be predicted by the same models for the solid rectangle section, but the inner cell circumference of the hollow box should be reduced to 0.45 of its original value for determining the theoretical thickness. Besides, based on the relative equations in current Chinese design code JTG D62-2004 for highway bridges, a modified predictive model about concrete shrinkage, in which the effect of size and cross-sectional shape of the member on the shrinkage deformation are included, is developed, and the applicability and feasibility of the proposed model are verified by the test results in present research and relevant literature.