建筑结构学报2025，Vol.46Issue(5)：44-56,152,14.DOI:10.14006/j.jzjgxb.2024.0397
翼缘对框架梁抗裂与抗震性能影响试验研究
Experimental study on effect of flange on cracking and seismic performance of frame beams
摘要
Abstract
In order to investigate the effect of flange width on crack resistance and seismic resistance of concrete frame beams,6 specimens with flange width-to-thickness ratio ranging from 0 to 6.0 were designed.Through the monotonic loading test,the process of crack formation and development at the end of the frame beam under vertical load was investigated.The bearing capacity,deformation,energy dissipation and failure mode of the frame beams with flange were investigated by low cyclic loading tests.The test results show that with the increase of flange width,the flexural bearing capacity of the frame beam increases,and the shear oblique cracks on the side of the beam increase.The stress of the reinforcement in the flange plate lags significantly behind the stress of the reinforcement in the beam,and the maximum crack width of the beam can be calculated according to the GB 50010-2010'Code for the Design of Concrete Structures'.The crack spacing and width of the tension flange are obviously different from those of the beam.The crack width of the tension flange can be estimated according to the axial tension member after the short-term crack width enlargement coefficient is amplified by 1.429 times.Under the action of cyclic load,as the width of the tensile flange increases,the number of shearing cracks increases,and the concrete damage at the bottom of the beam increases,the pinching of P-Δ hysteretic curve deepens and the energy dissipation capacity decreases.When the ratio of width to thickness of tension flange on each side of the frame beam end does not exceed 6,the contribution of 0.9 times floor reinforcement to the flexural capacity of the frame beam can be taken into account.Under the action of rare earthquakes,the maximum elongation in the negative moment zone is 0.603％～1.006％,and the residual elongation is 0.259％～0.426％.The frame beam is in the state of compressive bending force,which is not conducive to the formation of the'strong column and weak beam'mechanism,and should be paid attention to in seismic design.关键词
框架梁/翼缘/拟静力试验/裂缝宽度/抗震性能Key words
frame beam/flange/quasi-static test/crack width/seismic performance分类
土木建筑引用本文复制引用
范重,王璐璐,林秉耿,桂运全,张宏,杨鸿越,牟在根..翼缘对框架梁抗裂与抗震性能影响试验研究[J].建筑结构学报,2025,46(5):44-56,152,14.基金项目
中国建设科技集团科技创新基金中央研究院项目(Z2025C01). （Z2025C01）
