混凝土强度等级对全珊瑚海水钢筋混凝土梁抗剪性能的影响
|
摘要
通过对全珊瑚海水钢筋混凝土梁(coral aggregate reinforced concrete beam, CARCB)和普通钢筋混凝土梁(ordinary aggregate reinforced concrete beam, OARCB)进行斜截面抗剪性能试验,研究了混凝土强度等级对CARCB的裂缝发展、破坏形态、跨中变形及抗剪承载能力的影响,建立了弯矩-跨中挠度、挠度-梁长、荷载-最大裂缝宽度的关系,探讨了CARCB抗剪承载力(Vcs)的计算模型.结果表明:随着混凝土强度等级的提高, CARCB正截面开裂荷载(Vcr)、斜截面Vcr和Vcs均逐渐增大.不同混凝土强度等级的CARCB,其裂缝宽度均随着荷载的增大而增长,加载初期,在梁跨中附近出现正截面弯曲裂缝,裂缝宽度开展非常缓慢,随着荷载的增加,在支座向集中力作用点处出现斜裂缝,斜裂缝宽度迅速增大,最终导致梁破坏.在C60的CARCB中采用有机新涂层钢筋能有效抑制钢筋锈蚀.最后,综合考虑箍筋锈蚀和高强珊瑚混凝土(coral aggregate concrete, CAC)的影响,提出了更加合理的CARCB抗剪承载力计算模型.
The shear behavior of CARCB and OARCB were tested, the concrete strength grades were selected as parameters, the crack development, failure mode, midspan deflection and Vcswere studied, the relationships of bending moment-midspan deflection,deflection-beam length and load-maximum crack width were established, a calculation model for the Vcsof CARCB was suggested.The test results showed that the normal section Vcr, inclined section Vcrand Vcsincreased with the increase of concrete strength grade.The CARCB crack width increased with the increase of load for different concrete strength grades. In the initial loading stage, flexural cracks occurred at the midspan of the beam with slow development. However, as the load increased, inclined cracks were formed from the support to the concentrated force point, which widened rapidly, leading to beam failure. The application of organic new coated steel in the C60 CAC structure was suggested to effectively inhibit steel corrosion. Therefore, comprehensive consideration on the effects of stirrup corrosion and high-strength concrete on Vcsof CARCB, a calculation model for the Vcsof CARCB was proposed.
The shear behavior of CARCB and OARCB were tested, the concrete strength grades were selected as parameters, the crack development, failure mode, midspan deflection and Vcswere studied, the relationships of bending moment-midspan deflection,deflection-beam length and load-maximum crack width were established, a calculation model for the Vcsof CARCB was suggested.The test results showed that the normal section Vcr, inclined section Vcrand Vcsincreased with the increase of concrete strength grade.The CARCB crack width increased with the increase of load for different concrete strength grades. In the initial loading stage, flexural cracks occurred at the midspan of the beam with slow development. However, as the load increased, inclined cracks were formed from the support to the concentrated force point, which widened rapidly, leading to beam failure. The application of organic new coated steel in the C60 CAC structure was suggested to effectively inhibit steel corrosion. Therefore, comprehensive consideration on the effects of stirrup corrosion and high-strength concrete on Vcsof CARCB, a calculation model for the Vcsof CARCB was proposed.
引文
1 Arumugam R A,Ramamurthy K.Study of compressive strength characteristics of coral aggregate concrete.Mag Concrete Res,1996,48:141-148
2陈兆林,陈天月,曲勋明.珊瑚礁砂混凝土的应用可行性研究.海洋工程,1991,9:67-80
3 Chen M L,Ma J.Experimental study on shear behavior of the interface between new and old concrete with reinforced.KSCE J Civ Eng,2018,22:1882-1888
4 Frangopol D M,Lin K Y,Estes A C.Reliability of reinforced concrete girders under corrosion attack.J Struct Eng,1997,123:286-297
5 Da B,Yu H,Ma H,et al.Chloride diffusion study of coral concrete in a marine environment.Construction Building Mater,2016,123:47-58
6 Guzmán S,Gálvez J C,Sancho J M.Cover cracking of reinforced concrete due to rebar corrosion induced by chloride penetration.Cem Concr Res,2011,41:893-902
7 Chernin L,Val D V.Prediction of corrosion-induced cover cracking in reinforced concrete structures.Construction Building Mater,2011,25:1854-1869
8 Howdyshell P A.The Use of Coral As An Aggregate for Portland Cement Concrete Structures.Springfield:U.S.Department of Commerce,1974.8-24
9 Wattanachai P.A study on chloride ion diffusivity of porous aggregate concretes and improvement method.Adv Mater Res,2009,65:30-44
10 Kakooei S,Akil H M,Dolati A,et al.The corrosion investigation of rebar embedded in the fibers reinforced concrete.Construction Building Mater,2012,35:564-570
11张文.配筋珊瑚混凝土构件试验研究.硕士学位论文.南京:河海大学,1995.43-56
12 Wang L,Zhao Y L.The comparison of coral concrete and other light weight aggregate concrete on mechanics performance.AMR,2012,446-449:3369-3372
13 Da B,Yu H,Ma H,et al.Experimental investigation of whole stress-strain curves of coral concrete.Construction Building Mater,2016,122:81-89
14达波,余红发,麻海燕,等.全珊瑚海水混凝土单轴受压应力-应变全曲线试验研究.建筑结构学报,2017,38:144-151
15 Yu H,Da B,Ma H,et al.Durability of concrete structures in tropical atoll environment.Ocean Eng,2017,135:1-10
16达波,余红发,麻海燕,等.南海海域珊瑚混凝土结构的耐久性影响因素.硅酸盐学报,2016,44:253-260
17达波,余红发,麻海燕,等.全珊瑚海水混凝土的表面自由氯离子浓度和表观氯离子扩散系数.东南大学学报(自然科学版),2016,46:1093-1097
18 GB 50010-2010.混凝土结构设计规范.北京:中国建筑工业出社,2010
19 JGJ 12-2006.轻骨料混凝土结构技术规程.北京:中国建筑工业出社,2006
20 Bhargava K,Ghosh A K,Mori Y,et al.Model for cover cracking due to rebar corrosion in RC structures.Eng Struct,2006,28:1093-1109
21达波.高强全珊瑚海水混凝土的制备技术、耐久性及构件力学性能研究.博士学位论文.南京:南京航空航天大学,2017.137-145
22张伟平,张誉.锈胀开裂后钢筋混凝土粘结滑移本构关系研究.土木工程学报,2001,34:39-44
23袁迎曙,贾福萍.锈蚀钢筋的力学性能退化研究.工业建筑,2000,30:43-46
24王雪慧,钟铁毅.混凝土中锈蚀钢筋截面损失率与重量损失率的关系.建筑技术与应用,2005,12:4-6
2陈兆林,陈天月,曲勋明.珊瑚礁砂混凝土的应用可行性研究.海洋工程,1991,9:67-80
3 Chen M L,Ma J.Experimental study on shear behavior of the interface between new and old concrete with reinforced.KSCE J Civ Eng,2018,22:1882-1888
4 Frangopol D M,Lin K Y,Estes A C.Reliability of reinforced concrete girders under corrosion attack.J Struct Eng,1997,123:286-297
5 Da B,Yu H,Ma H,et al.Chloride diffusion study of coral concrete in a marine environment.Construction Building Mater,2016,123:47-58
6 Guzmán S,Gálvez J C,Sancho J M.Cover cracking of reinforced concrete due to rebar corrosion induced by chloride penetration.Cem Concr Res,2011,41:893-902
7 Chernin L,Val D V.Prediction of corrosion-induced cover cracking in reinforced concrete structures.Construction Building Mater,2011,25:1854-1869
8 Howdyshell P A.The Use of Coral As An Aggregate for Portland Cement Concrete Structures.Springfield:U.S.Department of Commerce,1974.8-24
9 Wattanachai P.A study on chloride ion diffusivity of porous aggregate concretes and improvement method.Adv Mater Res,2009,65:30-44
10 Kakooei S,Akil H M,Dolati A,et al.The corrosion investigation of rebar embedded in the fibers reinforced concrete.Construction Building Mater,2012,35:564-570
11张文.配筋珊瑚混凝土构件试验研究.硕士学位论文.南京:河海大学,1995.43-56
12 Wang L,Zhao Y L.The comparison of coral concrete and other light weight aggregate concrete on mechanics performance.AMR,2012,446-449:3369-3372
13 Da B,Yu H,Ma H,et al.Experimental investigation of whole stress-strain curves of coral concrete.Construction Building Mater,2016,122:81-89
14达波,余红发,麻海燕,等.全珊瑚海水混凝土单轴受压应力-应变全曲线试验研究.建筑结构学报,2017,38:144-151
15 Yu H,Da B,Ma H,et al.Durability of concrete structures in tropical atoll environment.Ocean Eng,2017,135:1-10
16达波,余红发,麻海燕,等.南海海域珊瑚混凝土结构的耐久性影响因素.硅酸盐学报,2016,44:253-260
17达波,余红发,麻海燕,等.全珊瑚海水混凝土的表面自由氯离子浓度和表观氯离子扩散系数.东南大学学报(自然科学版),2016,46:1093-1097
18 GB 50010-2010.混凝土结构设计规范.北京:中国建筑工业出社,2010
19 JGJ 12-2006.轻骨料混凝土结构技术规程.北京:中国建筑工业出社,2006
20 Bhargava K,Ghosh A K,Mori Y,et al.Model for cover cracking due to rebar corrosion in RC structures.Eng Struct,2006,28:1093-1109
21达波.高强全珊瑚海水混凝土的制备技术、耐久性及构件力学性能研究.博士学位论文.南京:南京航空航天大学,2017.137-145
22张伟平,张誉.锈胀开裂后钢筋混凝土粘结滑移本构关系研究.土木工程学报,2001,34:39-44
23袁迎曙,贾福萍.锈蚀钢筋的力学性能退化研究.工业建筑,2000,30:43-46
24王雪慧,钟铁毅.混凝土中锈蚀钢筋截面损失率与重量损失率的关系.建筑技术与应用,2005,12:4-6
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |