摘要
为了研究玻璃纤维增强复合材料(GFRP)筋与普通钢筋混合配筋混凝土梁(以下简称“混合配筋梁”)的受弯性能,选取普通混凝土和钢纤维混凝土,设计制作8根混合配筋梁和5根纯钢筋/GFRP筋梁。通过受弯试验,重点探讨普通/钢纤维混凝土混合配筋梁的平均裂缝间距、短期最大裂缝宽度和跨中挠度等的变化。同时,基于混合配筋梁的相关计算理论,考虑钢纤维特性和受拉区混凝土抗拉强度,给出适用于普通/钢纤维混凝土混合配筋梁的平均裂缝间距、短期最大裂缝宽度以及跨中挠度的建议计算公式。结果表明:在相同条件下,混合配筋梁的裂缝宽度和挠度发展速度稍快于普通钢筋梁,但明显慢于纯GFRP筋梁;采用钢纤维混凝土可显著抑制裂缝发展并且提高梁的刚度;建议的混合配筋梁的平均裂缝间距、短期最大裂缝宽度以及跨中挠度的预测值与实测值吻合较好。
In order to investigate the flexural capacity of hybrid-reinforced beams and glass fiber reinforced polymer(GFRP)bars,eight hybrid-reinforced beams and five pure steel reinforced/GFRP beams were made by ordinary concrete and steel fiber concrete.Through the flexural tests,the variation of average crack spacing,short-term maximum crack width and mid-span deflection of ordinary/steel fiber concrete hybrid-reinforced beams were mainly discussed.At the same time,based on the relevant calculation theory of hybrid-reinforced beams,and considering the characteristics of steel fibers and the tensile strength of the concrete in the tensile zone,the calculation methods of average crack spacing,short-term maximum crack width and mid-deflection of the ordinary/steel fiber concrete hybrid-reinforced beams were presented.Results showed that under the same conditions,the expansion rate of crack width and deflection of the hybrid-reinforced beams were slightly faster than that of the ordinary steel reinforced beams,but obviously slower than that of the pure GFRP reinforced beams.Steel fiber concrete could significantly restrain the crack development and improve the stiffness of beams.The suggested average crack spacing,short-term maximum crack width and mid-span deflection of the hybrid-reinforced beams of the predicted values agreed well with the measured values.
作者
陆春华
吴小龙
徐可
张菊连
LU Chunhua;WU Xiaolong;XU Ke;ZHANG Julian(Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China;Shanghai Horizon Construction Technology Co. Ltd., Shanghai 201800, China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2022年第2期197-206,共10页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金(51878319,51578267)
江苏省“六大人才高峰”(2015-JZ-008)。
关键词
混合配筋梁
普通混凝土
钢纤维混凝土
裂缝
挠度
hybrid-reinforced beams
ordinary concrete
steel fiber concrete
cracks
deflection
