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超高性能混凝土梁抗弯承载力机理与简化计算
作者：陈俊生1，2，高强1，徐承凯1
（1.华南理工大学 土木与交通学院，亚热带建筑科学国家重点实验室，广东 广州 510640；2.华南岩土工程研究院，广东 广州 510640）
摘要：为推进超高性能混凝土（UHPC）构件在实际工程中的应用，对无配筋的素UHPC梁抗弯性能进行了一系列理论分析和数值模拟研究。基于已有经验公式和平截面假定，推导出UHPC梁开裂弯矩和极限承载力计算公式。利用ABAQUS有限元软件建立素UHPC梁的数值分析模型，将开裂弯矩和极限承载力公式计算值与梁开裂弯矩和极限弯矩模拟值进行比较。结果表明：开裂弯矩公式计算值与有限元模拟值偏差率为6.16%，极限承载力公式计算值与有限元模拟值偏差率仅为1.38%。说明公式计算值具有较高的精度，也验证了计算方法的可靠性。
关键词：UHPC梁；开裂弯矩；极限承载力；理论分析；数值模拟；简化计算
中图分类号：TU528.31 文献标识码：A 文章编号：1001-702X（2023）01-0024-06
Mechanism and simplified calculation of bending bearing capacity of ultra-high performance concrete beam
CHEN Junsheng1，2，GAO Qiang1，XU Chengkai1
（1.School of Civil Engineering and Transportation，South China University of Technology，State Key Laboratory of Subtropical Building Science，Guangzhou 510640，China；2.South China Institute of Geotechnical Engineering，Guangzhou 510640，China）
Abstract：In order to promote the application of ultra-high performance concrete （UHPC） components in practical engineering in China，a series of theoretical analysis and numerical simulation studies of the bending performance of the plain UHPC beam without reinforcement were conducted. Based on the empirical formula and the cross-section assumption，the formulas for calculating the cracking moment and limit bearing capacity of UHPC beam were deduced. The numerical analysis model of the plain UHPC beam was established using the ABAQUS finite element software，and the calculated values of cracking moment and ultimate bearing capacity formula were compared with the simulated values of beam cracking moment and ultimate moment. The results show that the deviation rate between the calculated value of cracking moment and the simulated value of finite element is 6.16%，and the deviation rate between the calculated value of ultimate moment and the simulated value of finite element is only 1.38%. It shows that the calculated value of the formula has high accuracy，and also verifies the reliability of this calculation method.
Key words：ultra-high performance concrete beam，cracking moment，ultimate bearing capacity，theoretical analysis，numerical simulation，simplified calculation