摘要
收集国内外218组纤维增强复合材料(FRP)筋混凝土梁受弯性能试验结果,重点研究了正常使用阶段和极限状态下梁挠度和裂缝宽度的发展规律,基于试验数据修正了FRP筋应变不均匀系数ψ与强度配筋影响系数的关系,建立了该类梁受弯挠度计算模型;深入分析了FRP筋混凝土梁受弯截面内力臂系数η、构件受力特征系数αcr对构件裂缝宽度计算精度的影响,确定η,αcr的合理取值,优化计算模型,并与规范GB 50608—2010建议模型计算值进行对比分析。结果表明:根据建立的ψ与强度配筋影响系数关系,选取η=0.88,α_(cr)=1.5得到的建议模型能够较好预测FRP筋混凝土梁受弯挠度和裂缝宽度,比规范计算结果吻合好,验证了建议模型的准确性和合理性。
The 218 groups of flexural test results at home and abroad of concrete beams reinforced with fiber reinforced polymer （FRP） were collected, and the development laws of beam deflection and crack width under serviceability limit state and ultimate limit state were studied emphatically. On the basis of test data, the relationship between the non-uniformity coefficient of FRP strain and influence coefficient of strength reinforcement was corrected, and the deflection calculation model of flexural member was established. The influences of coefficient of internal force arm and force characteristic coefficient of component of the FRP reinforced concrete beam bending section on the calculation accuracy of crack width were deeply analyzed. The reasonable values of r/and aor were determined, and the calculation model was optimized. The calculated values were compared with that of the model proposed by technical code GB 50608--2010 for infrastructure application of FRP composites. The results show that the suggested model by selecting η= 0.88, αcr = 1.5 based on the relationship between ψ and influence coefficient of strength reinforcement can predict the deflection and the crack width of concrete beams reinforced with FRP bars better than GB 50608-2010, and the calculation results of modified model are in good agreement with experimental results, the accuracy and rationality of the proposed model is verified.
出处
《建筑科学与工程学报》
CAS
北大核心
2017年第5期163-170,共8页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(51578072)
陕西省自然科学基础研究计划项目(2016JM5070
2017JQ5092)
陕西省科技统筹创新工程计划项目(2015KTZDSF03-04)
关键词
FRP筋混凝土梁
受弯构件
挠度
裂缝宽度
应变不均匀系数
concrete beam reinforced with FRP bar
flexural member
deflection
crack width
non-uniformity coefficient of strain
