钢纤维轻骨料混凝土细观均匀化及受扭构件极限承载力研究  

Microscopic Homogenization of Steel Fiber Lightweight Aggregate Concrete and Ultimate Bearing Capacity of Torsion Components

作　　者：王辉明[1] 贺正波 朱文 WANG Huiming;HE Zhengbo;ZHU Wen(College of Civil Engineering and Architecture,Xinjiang University,Urumqi 830046,China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830046

出　　处：《硅酸盐通报》2021年第10期3376-3384,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51568062);新疆维吾尔自治区自然科学基金(2016D01C063)。

摘　　要：钢纤维轻骨料混凝土(SFLWC)因自重轻、耐热性好等优点,在土木工程中应用愈加广泛。由于其本质为多相复合材料,力学性能试验结果离散性大且试验费时耗力,因此采用细观均匀化理论预测其力学性能是有效方法之一。本文运用Mori-Tanaka均匀化理论,预测钢纤维体积掺量为0%、0.5%、1%、1.5%时钢纤维轻骨料混凝土的弹性模量,并以此为基础进行了钢纤维轻骨料混凝土的抗扭性能有限元分析,对受扭构件极限承载力经验计算公式提出修正建议。结果表明,均匀化理论得到的弹性模量预测值与规范中经验公式计算结果误差很小且与试验结果吻合很好,通过有限元计算得到的钢纤维轻骨料混凝土梁扭转曲线与相关试验结果符合较好,本文建议的极限扭矩计算修正公式与试验结果相比较为一致,故建议的修正公式对工程计算和应用有一定的实际参考价值。Due to the advantages of light weight and excellent heat resistance, steel fiber lightweight aggregate concrete(SFLWC) is increasingly used in civil engineering. Considering the SFLWC is a multiphase composite material in nature, and the mechanical performance test results are highly discrete and the test is time-consuming and labor-intensive, the application of microscopic homogenization theory to predict its mechanical properties is considered to be one of the effective methods. Based on the Mori-Tanaka homogenization theory, this paper predicted the elastic modulus of steel fiber lightweight aggregate concrete when the steel fiber volume content is 0%, 0.5%, 1%, and 1.5%. And on that basis, it carried out torsion finite element calculations on steel fiber lightweight aggregate concrete beams, and proposed amendments to the empirical calculation formula for the ultimate bearing capacity of torsion components. The results show that the predicted value of elastic modulus obtained by the homogenization theory had little error with the calculation result of the empirical formula in the specification, and it is in good agreement with the test results. The torsion curve of steel fiber lightweight aggregate concrete beam obtained by finite element calculation accorded with the relevant test results to a high degree. The calculation and correction formula of the limit torque proposed in this paper is relatively consistent with the test results. Therefore, the proposed correction formula has been verified to be of certain practical reference value for engineering calculation and application.

关 键 词：钢纤维轻骨料混凝土 Mori-Tanaka均匀化理论 有限元分析 纤维掺量 极限扭矩 

分 类 号：TU528[建筑科学—建筑技术科学]