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集中荷载作用下后浇UHTCC简支双向混凝土板的试验研究

ISSN号：1000-131X
期刊名称：《土木工程学报》
时间：0
分类：TU375.2[建筑科学—结构工程]
作者机构：[1]浙江大学,浙江杭州310058, [2]大连市建筑科学研究设计院股份有限公司,辽宁大连116021, [3]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072
相关基金：基金项目：国家自然科学基金重点项目（50438010）,南水北调工程建设重大关键技术研究及应用（JGZXJJ2006-13）

关键词：后浇UHTCC, 简支双向复合板, 集中荷载, 限裂宽度, post-pouring UHTCC, two-way simply supported composite slab, concentrated load, crack width limit

中文摘要：

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类似于后浇混凝土复合板的脆性破坏。运用非线性三维有限元软件对试验进行数值计算，通过合理的建模和定义材料属性，对试验结果进行分析预测，包括荷载．挠度曲线、受弯底面的挠度分布和应变分布等。分析结果与试验结果基本一致，表明此方法适用于文中复合板件的计算，为采用UHTCC作为保护层或加固层的复合双向板的设计、分析和优化提供分析依据。

英文摘要：

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.

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