GFRP筋橡胶集料混凝土梁受弯性能  

Analyses on flexural behavior of GFRP-reinforced crumb rubber concrete beams

作　　者：赵秋红[1,2] 刘凯 王菲[1] 李一康 Qiuhong ZHAO;Kai LIU;Fei WANG;Yikang LI(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of China Ministry of Education,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300350

出　　处：《复合材料学报》2021年第5期1611-1622,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51378340,51678406,51878447)。

摘　　要：为提高纤维增强聚合物复合材料(FRP)筋混凝土梁抗裂性能,改善其脆性破坏特征,将玻璃纤维增强聚合物复合材料(GFRP)筋与橡胶集料混凝土共同应用于梁构件中。采用ABAQUS对GFRP筋橡胶集料混凝土梁的受弯性能进行有限元模拟及参数分析,探究了橡胶掺量、GFRP筋配筋率、混凝土强度等级及截面高度对梁受弯性能的影响。结果表明:增加混凝土中橡胶颗粒的掺量可提高梁的开裂荷载,当橡胶掺量为15%时,开裂荷载提高了29%;增加配筋率可提高梁的开裂荷载和承载力,当受拉筋直径由10 mm增加至18 mm时,橡胶掺量为10%的GFRP筋橡胶混凝土梁开裂荷载提高了约15%,承载力提高了约85%,但配筋率增加至一定数值后,其影响不再明显;提高橡胶混凝土强度等级,可提高梁的开裂荷载及承载力,当橡胶混凝土强度等级由C25提高至C40时,开裂荷载提了高约53.7%,承载力提高了约23%;为更好地满足正常使用极限状态,GFRP筋橡胶混凝土梁的截面高度宜适当增加。In order to improve the crack resistance capacity, and avoid the brittle failure of the fiber-reinforced polymer composite(FRP) reinforced concrete beams, a mixed-use of glass fiber-reinforced polymer composite(GFRP)bars and crumb rubber concrete was adopted in beam components under bending. Finite element analysis software ABAQUS was used to simulate the flexural behavior of GFRP-reinforced crumb rubber concrete beams. Parametric studies were conducted to study the influence of rubber content, reinforcement ratio, concrete strength grade, and cross-section height on the flexural behavior of GFRP-reinforced crumb rubber concrete beams. The results show that the cracking load of beam increases with the increase of rubber content. The cracking load of beam increases by 29% when the rubber content of concrete is 15%. Increasing the reinforcement ratio could improve the cracking load and flexural strength of the beam. The cracking load of the GFRP-reinforced crumb rubber concrete beam with rubber replacement ratio of 10% has a 15% increase and the flexural strength of the beam has 85% increase induced by increasing the diameter of the GFRP bar from 10 mm to 18 mm. However, when the reinforcement ratio reaches a certain value, the influence is no longer obvious. Increasing the crumb rubber concrete strength can improve the cracking load and flexural strength of the beam. Increasing the crumb rubber concrete strength from C25 to C40 results in approximately 53.7% increase in cracking load, and more than 23% increase in flexural strength. The beams with higher section height are more likely to meet the requirements at normal serviceable limit state.

关 键 词：FRP筋混凝土梁 橡胶混凝土 非线性有限元分析 受弯性能 极限受弯承载力 

分 类 号：TU377.9[建筑科学—结构工程]