HRB500级钢筋活性粉末混凝土梁受弯性能试验研究*
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（1 广西岩土力学与工程重点实验室, 桂林 541004； 2 桂林理工大学土木与建筑工程学院， 桂林 541004； 3 南昌铁路勘测设计院有限责任公司， 南昌 330009）
［摘要］通过5根配置HRB500级或HRB400级钢筋活性粉末混凝土简支梁的受弯性能试验，分析试验梁在各级荷载作用下的裂缝分布与开展情况。根据实测数据，验证现行混凝土规范有关受拉区裂缝间距和最大裂缝宽度等计算公式对于试验梁的适用性，并提出了极限弯矩的计算方法。研究表明：试验梁的裂缝分布及宽度与配筋率、钢筋直径和钢筋等级等参数相关；计算高强钢筋活性粉末混凝土梁的正截面承载力时，应考虑活性粉末混凝土的抗拉强度和钢纤维的拉结作用，受拉区等效塑性系数k可取0.3。［关键词］高强钢筋; 活性粉末混凝土; 简支梁; 裂缝宽度; 极限弯矩中图分类号：TU375 文献标识码：A 文章编号：1002-848X(2015)15-0087-06
Experimental study on flexural property of reactive powder concrete beams with HRB500 steelJin Lingzhi1, 2, He lai1, 2, Wu Xinke3（1 Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering， Guilin 541004, China; 2 College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China; 3 Nanchang Railway Survey & Design Institute, Nanchang 330009, China）Abstract:An experimental study was conducted to investigate the flexural property of 5 reactive power concrete beams with HRB400 or HRB500 steel. The crack distribution and development in test beams were analyzed under various stepwise loadings. According to the measured datum, the applicability of tensile area crack spacing and maximum crack width calculation formulas in current concrete code for test beams were verified, and the computing method of the ultimate bending moment was suggested. The research shows that the crack distribution and width of test beams relate to parameters like reinforcement ratio, steel diameter, steel grade and so on. To calculate the normal section bearing capacity of high strength reinforced reactive powder concrete beams, the tensile strength of reactive powder concrete and the tying effect of steel fiber should be considered, and the equivalent plastic coefficient k within tensile region is set to 0.3.Keywords:high strength steel bar; reactive powder concrete; simple supported beam; crack width; ultimate bending moment
*国家自然科学基金资助（51368013），广西重点实验室项目资助（11-CX-04）。作者简介：金凌志，学士，教授，Email：jlz-5904@163.com。
