在13根钢纤维高强混凝土梁等幅疲劳试验基础上,探讨了等效应力比、钢纤维类型、钢纤维体积率、钢纤维掺入范围和混凝土强度对钢纤维高强混凝土梁挠度和刚度的影响,建立了基于有效惯性矩的钢纤维高强混凝土梁刚度计算模型及公式。结果表明:在高强混凝土梁中掺入钢纤维提高了梁的截面刚度,使疲劳荷载作用下高强混凝土梁跨中挠度减小15%~61%;基于有效惯性矩的钢纤维高强混凝土梁挠度和刚度计算结果与试验结果吻合较好。
Abstract
Based on the constant amplitude fatigue tests on 13 steel fiber reinforced high-strength concrete beams, the influences of equivalent stress, steel fiber types and volume fractions, depth of steel fiber layer and concrete strength on the deflection and stiffness of steel fiber reinforced high-strength concrete beams were investigated. The calculation method and formulas for stiffness of steel fiber reinforced high-strength concrete beams were put forward based on the effective moment of inertia. The results show that adding steel fiber into the high-strength concrete beam can increase its section stiffness effectively, and the deflection of steel fiber reinforced high-strength concrete beams decreases by 15%-61% under fatigue load.The calculated values of deflection and stiffness based on effective moment of inertia have good agreement with test results.
关键词
桥梁工程 /
高强混凝土梁 /
疲劳试验 /
钢纤维 /
挠度 /
刚度
{{custom_keyword}} /
Key words
bridge engineering /
high-strength concrete beam /
fatigue test /
steel fiber /
deflection /
stiffness
{{custom_keyword}} /
中图分类号：
U441.4
{{custom_clc.code}}
({{custom_clc.text}})
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 赵国藩,彭少民,黄承逵,等.钢纤维混凝土结构[M].北京:中国建筑工业出版社,1999.
ZHAO Guo-fan,PENG Shao-min,HUANG Cheng-kui,et al.Steel Fiber Reinforced Concrete Structure [M].Beijing:China Architecture ＆ Building Press,1999.
[2] 高丹盈,赵 军,朱海堂.钢纤维混凝土设计与应用[M].北京:中国建筑工业出版社,2002.
GAO Dan-ying,ZHAO Jun,ZHU Hai-tang.Design and Application of Steel Fiber Concrete [M].Beijing:China Architecture ＆ Building Press,2002.
[3] CHANG D L,CHAI W K.Flexural Fracture and Fatigue Behavior of Steel-fiber-reinforced Concrete Structures[J].Nuclear Engineering and Design,1995,156(1/2):201-207.
[4] SURINDER P S.Fatigue Strength of Hybrid Steel-Polypropylene Fibrous Concrete Beams in Flexure[J].Procedia Engineering,2011,14:2446-2452.
[5] 赵 军,高丹盈.钢纤维增强钢筋混凝土梁裂缝宽度的统一计算方法[J].混凝土,2005(5):91-94.
ZHAO Jun,GAO Dan-ying.Uniform Calculating Method of Crack Width on Steel Fibre Reinforced Concrete Beams[J].Concrete,2005(5):91-94
[6] GB 50152—1992,混凝土结构试验方法标准[S].
GB 50152—1992,Standard for Test Methods of Concrete Structures[S].
[7] 孟建伟,王海龙,钟 铭.用解析刚度法求解高强钢筋混凝土梁的疲劳刚度[J].石家庄铁道学院学报,2004,17(3):67-70.
MENG Jian-wei,WANG Hai-long,ZHONG Ming.Testing Research for Fatigue Rigidity of High Strength Reinforced Concrete Beams[J].Journal of Shijiazhuang Railway Institute,2004,17(3):67-70.
[8] 汤红卫,李士彬,朱慈勉.基于刚度下降的混凝土梁疲劳累积损伤模型的研究[J].铁道学报,2007,29(3):84-88.
TANG Hong-wei,LI Shi-bin,ZHU Ci-mian.A Fatigue Cumulative Damage Model of RC Beam Based on Stiffness Degradation[J].Journal of the China Railway Society,2007,29(3):84-88.
[9] 钱永久,车惠民.疲劳荷载作用下无粘结部份预应力混凝土梁的应力和挠度计算[J].四川建筑科学研究,1988(1):22-27.
QIAN Yong-jiu,CHE Hui-min.Calculation of Stress and Deflection of Unbonded Partially Prestressed Concrete Beams Under the Fatigue Load[J].Sichuan Building Science,1988(1):22-27.
[10] 过镇海,时旭东.钢筋混凝土原理与分析[M].北京:清华大学出版社,2003.
GUO Zhen-hai,SHI Xu-dong.Reinforced Concrete Theory and Analyse[M].Beijing:Tsinghua Univer-sity Press,2003.
[11] CECS 38:2004,纤维混凝土结构技术规程[S].
CECS 38:2004,Technical Specification for Fiber Reinforced Concrete Structures[S].
[12] GB 50010—2010,混凝土结构设计规范[S].
GB 50010—2010,Technical Specification for Concrete Structures[S].
[13]袁 媛.钢筋钢纤维混凝土短梁受弯性能试验研究[D].郑州:郑州大学,2006.
YUAN Yuan.Research on Flexural Behavior of Steel Fiber Reinforced Short Concrete Beams [D].Zhengzhou:Zhengzhou University,2006.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
国家自然科学基金项目(51178434)
{{custom_fund}}
{{custom_fund}}
PDF全文下载(986 KB)
