开槽型混凝土叠合板受力性能有限元分析与承载力计算
Finite element analysis of mechanical behavior and calculation of bearing capacities for concrete composite slab with rabbets
聂鑫 1周心怡 1庄亮东1
作者信息
- 1. 清华大学土木工程系,北京 100084;清华大学土木工程安全与耐久教育部重点实验室,北京 100084
- 折叠
摘要
开槽型混凝土叠合板采用板端开槽放置附加钢筋的形式取代胡子筋,可以提高施工效率,在工程中已得到广泛应用.为进一步研究开槽型叠合板的受力性能和关键设计参数,采用有限元软件ABAQUS进行建模分析.针对槽口附加钢筋滑移模拟和新旧混凝土界面模拟方法开展研究,并与试验结果对比,验证了有限元建模的合理性.进一步通过该有限元模型开展参数分析.结果表明,附加钢筋直径过大或过小于预制板纵筋直径都会损伤受力性能,槽口保护层厚度由40 mm减小至20 mm时,叠合板承载力提高18.3％,槽口长度由100 mm增加至300 mm时,叠合板的承载力提高176％.同时,对开槽型叠合板承载力的设计公式进行了理论推导,并与有限元分析结果对比,误差基本小于10％,两者吻合较好.
Abstract
Concrete composite slab with rabbets that replaces beard bars with additional bars has been widely used due to its construction convenience.To investigate its mechanical behavior and key design parameters,finite element models of concrete composite slabs using ABAQUS software were established and the modeling methods of additional bars slip and old-to-new concrete interfaces were explored.By comparing modelling results with experiment results,the accuracy of the FE models was verified.Further,the parametric analyses were conducted and the results reveal that the diameter of additional bar being excessively large or small compared to that of the precast slab bar will deteriorate the mechanical performance.Reduction in protective layer thickness(from 40 mm to 20 mm)and increase in rabbet length(from 100 mm to 300 mm)enhance the capacities by 18.3％and 176％,respectively.Finally,the bearing capacity design formula was deduced.Compared with FE results,the errors are typically within 10％,showing an agreement with FE analyses.
关键词
叠合板/槽口/有限元分析/设计方法/受弯承载力Key words
composite slab/rabbet/finite element analysis/design method/bending capacity引用本文复制引用
基金项目
国家自然科学基金项目(52250003)
国家自然科学基金项目(52022045)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据