配筋率对全珊瑚海水钢筋混凝土梁受弯性能的影响  

Influence of reinforcement ratio to flexural behavior of coral aggregate reinforced concrete beam

作　　者：达波 余红发[3] 麻海燕[3] 陈达[1,2] 李森林[4] 糜人杰 吴彰钰 DA Bo;YU Hongfa;MA Haiyan;CHEN Da;LI Senlin;MI Renjie;WU Zhangyu(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Key Laboratory of Coastal Disaster and Defence of the Ministry of Education,Hohai University,Nanjing 210098,China;Department of Civil Engineering,Nanjing University of Aeronautic and Astronautic,Nanjing 210016,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [3]南京航空航天大学土木工程系,江苏南京210016 [4]南京水利科学研究院,江苏南京210029 [5]东南大学材料科学与工程学院,江苏南京211189

出　　处：《建筑结构学报》2020年第6期143-148,共6页Journal of Building Structures

基　　金：国家自然科学基金项目(51878350,11832013);江苏省自然科学基金项目(BK20180433);广西防灾减灾与工程安全重点实验室开放基金(2019ZDK006)。

摘　　要：通过对全珊瑚海水钢筋混凝土梁(CARCB)和普通钢筋混凝土梁(OARCB)进行受弯性能试验,研究了混凝土种类和配筋率对CARCB的变形性能、承载能力的影响。结果表明:随着配筋率的提高,CARCB的开裂弯矩和极限弯矩均逐渐增大,裂缝宽度扩展逐渐减慢,能有效抑制裂缝的发展。同时,可以通过提高配筋率,增大开裂弯矩与极限弯矩的比值,从而延后CARCB的开裂时间。CARCB的裂缝宽度均随着荷载的增长而增大,在加载初期,裂缝宽度增长缓慢,接近极限荷载时,裂缝宽度迅速增大,最终导致梁破坏。此外,综合考虑钢筋锈蚀引起钢筋截面损失和钢筋屈服强度降低的影响,提出了CARCB的极限弯矩、纵向受拉钢筋应力、平均裂缝间距和平均裂缝宽度的计算模型。The bending tests toward coral aggregate reinforced concrete beams( CARCB) and ordinary aggregate reinforced concrete beams( OARCB) were carried out. The concrete types and reinforcement ratios were selected as parameters to study the deforming capacity and flexural capacity. The results show that the crack bending moment and ultimate bending moment gradually increase with the reinforcement ratio,and the extension of the crack width is gradually slowed down, indicating an effectively inhibited development of cracks. Furthermore, by increasing reinforcement ratio,the ratio of the crack bending moment and ultimate bending moment could be increased to delay the cracking of CARCB. With the increase of load,the crack width increases. At the beginning of the loading,the crack width increases slowly,and then increases rapidly when the load is approaching the ultimate load until the failure of beam. Meanwhile,by giving comprehensive consideration on the effects of steel corrosion on the loss of steel section and the decrease of steel yield strength,a calculation model for predicting ultimate bending moment,longitudinal tensile steel stress,average crack distance and average crack width of CARCB was proposed.

关 键 词：钢筋混凝土梁 珊瑚混凝土 配筋率 静力试验 受弯性能 

分 类 号：TU528[建筑科学—建筑技术科学]