在既有钢筋混凝土板的受弯面上浇筑一定厚度超高韧性水泥基复合材料（UHTCC）或混凝土材料制成复合板，通过集中荷载作用下简支双向板试验，考察复合板试件的弯曲破坏形态和底面裂缝的走向特征等。试验结果表明，后浇材料有效提高整体构件的承载力和前期刚度。后浇混凝土复合板与对比混凝土板相比较，韧性改善较小，开裂时中心挠度基本没有变化；而UHTCC后浇层的加入，改善混凝土板的整体韧性，开裂时中心挠度与原构件相比最高可提高至235％。并且UHTCC层有效限制受弯底面裂缝的开裂和扩展，延迟有害裂缝的出现，加载过程中没有出现%Tests of two-way simply supported composite slabs under concentrated load were carried out. Ultra-High Toughness Cementitious Composites （UHTCC） or concrete materials were poured onto the bending surface of reinforced concrete slabs to form composite slabs. The failure characteristics of specimens and the directions of superficial cracking were observed. The results showed that the post-poured materials could effectively improve the bearing capacity and early rigidity of the components, and the composite slab had almost no change in the cracking center deflection, when compared with the original component. Due to the UHTCC layer, the overall rigidity of the composite slab increased, and the cracking center deflection could increase up to 235%. The UHTCC layer also delayed the appearance of the detrimental cracks on the bending surface, and there was no brittle failure during the loading process. Nonlinear three- dimensional finite element software was applied to analyze and forecast the test results, including the load-deflection curve, deflection distribution and strain distribution of the UHTCC. The calculations were basically consistent with the experimental results, indicating that this method was suitable for calculation of the composite slabs. This study provided experimental and theoretical bases for two-way composite slab design, analysis and optimization.
展开▼
