负弯矩作用下蜂窝组合梁的承载力
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摘要
蜂窝组合梁能降低建筑层高,为了研究蜂窝组合梁负弯矩区段承载力,设计了两个蜂窝组合梁试件,并进行了静力加载试验,研究了扩张比、第一洞口间距对蜂窝组合梁的强度、刚度和破坏模式的影响.试验结果表明:对于扩张比小于1.3的试件,蜂窝组合梁在近支座截面或第一洞口中心截面发生弯曲破坏;在扩张比给定的情况下,蜂窝组合梁的第一洞口间距主要影响蜂窝组合梁的破坏模式;当近支座截面和第一洞口截面同时为蜂窝组合梁的破坏控制截面时,钢梁扩张比对蜂窝组合梁的强度与刚度影响较大.在试验研究的基础上提出了近支座截面的名义抗弯承载力计算方法,该方法同时考虑了构件的破坏模式与两个控制截面的抗弯承载力,公式计算值与试验值吻合.
Castellated composite beam can decrease the floor height of buildings. In order to investigate the bending capacity of castellated composite beam under negative moment,two cantilever beam specimens were designed and tested by applying static loads. The influences of the expansion ratio and location of first web opening on beam mechanical behavior were studied. The results show that bending failures of the specimens occur near the beam support section or the first web opening section for the specimens with the expansion ratio no larger than 1.3. When the expansion ratio of specimens is maintained unchanged,the location of the first web opening mainly affects on the failure mode of the beam. For both the beam support section and the first web opening section being the strength control section,the expansion ratio of specimens have greatly effect on the strength and stiffness of the beam. Considering both the failure modes and the flexural capacity of two control sections,the method calculating the nominal bending capacity of the castellated composite beam near the support section were presented,and the calculated va-lues fit well with the experimental ones.
Castellated composite beam can decrease the floor height of buildings. In order to investigate the bending capacity of castellated composite beam under negative moment,two cantilever beam specimens were designed and tested by applying static loads. The influences of the expansion ratio and location of first web opening on beam mechanical behavior were studied. The results show that bending failures of the specimens occur near the beam support section or the first web opening section for the specimens with the expansion ratio no larger than 1.3. When the expansion ratio of specimens is maintained unchanged,the location of the first web opening mainly affects on the failure mode of the beam. For both the beam support section and the first web opening section being the strength control section,the expansion ratio of specimens have greatly effect on the strength and stiffness of the beam. Considering both the failure modes and the flexural capacity of two control sections,the method calculating the nominal bending capacity of the castellated composite beam near the support section were presented,and the calculated va-lues fit well with the experimental ones.
引文
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[2] 廖文远,周东华,李龙起,等.负弯矩作用下腹板开洞组合梁抗剪性能试验研究 [J].四川大学学报(工程科学版),2014,46(4):46- 52.LIAO Wen-yuan,ZHOU Dong-hua,LI Long-qi,et al.Experimental study on shear behavior of composite beams with web opening under negative moment [J].Journal of Sichuan University(Engineering Science Edition),2014,46(4):46- 52.
[3] CHUNG K F,LAWSON R M.Simplified design of composite beams with large web openings to Eurocode 4 [J].Journal of Construction Steel Research,2001,57(2):135- 163.
[4] BS EN 1994-1-2,Design of composite steel and concrete structures [S].
[5] REDWOOD G P.Tests of composite beams with web holes [J].Canadian Journal of Civil Engineering,1983,10(4):713- 721.
[6] 杨洪志.带腹板开洞组合梁极限承载力的研究 [D].昆明:昆明理工大学,2008.
[7] 苏益声,肖祖霖,孟二从,等.钢-混凝土蜂窝组合梁承载力试验研究 [J].广西大学学报(自然科学版),2014,39(1):1- 6.SU Yi-sheng,XIAO Zu-lin,Meng Er-cong,et al.Experimental study on bearing capacity of cellular-steel concrete composite beam [J].Journal of Guangxi University(Engineering Science Edition),2014,39(1):1- 6.
[8] 李华,陈涛,顾祥林.负弯矩区腹板开洞钢-混凝土组合梁受力性能试验研究 [J].结构工程师,2008,24(4):99- 105.LI Hua,CHEN Tao,GU Xiang-lin.Experimental study on behavior of steel-concrete composite beams with web openings under negative moment [J].Structural Engineers,2008,24(4):99- 105.
[9] 陈涛,李华,顾祥林.负弯矩区腹板开洞钢-混凝土组合梁承载力试验研究与理论分析 [J].建筑结构学报,2011,32(4):63- 71.CHEN Tao,LI Hua,GU Xiang-lin.Experimental study and theoretical analysis on load carrying capacity of steel-concrete composite beams with web openings under negative moment [J].Journal of Building Structures,2011,32(4):63- 71.
[10] 白永生,蒋永生,梁书亭,等.腹板开洞的钢与混凝土组合梁承载力计算方法综述和探讨 [J].工业建筑,2004,34(6):68- 70.BAI Yong-sheng,JIANG Yong-sheng,LIANG Shu-ting,et al.Exploration and summarization of method of computing bearing capacity of steel-concrete composite beams with web opening [J].Industrial Construction,2004,34(6):68- 70.
[11] SONCK D,BELIS J.Weak-axis flexural buckling of ce-llular and castellated columns [J].Journal of Constructional Steel Research,2016,124:91- 100.
[12] TUDJONO S,SUNARTO,HAN A L.Analysis of caste-llated steel beam with oval openings [J].Materials Science and Engineering.2017,271(1):012104.
[13] WANG P,GUO K,LIU M,et al.Shear buckling strengths of web-posts in a castellated steel beam with hexagonal web openings [J].Journal of Constructional Steel Research.2016,121:173- 184.
[14] DURIF S,BOUCHAIR A.Analytical model to predict the resistance of cellular beams with sinusoidal openings [J].Journal of Constructional Steel Research.2016,121:80- 96.
[15] GB 50017—2003,钢结构设计规范 [S].
[16] American Institute of Steel Construction.Load and resis-tance factor design specification for structural steel buildings [M].Chicago:IL,1999.
[17] 黄相才,万卷,王清湘,等.对称中置集中荷载钢筋砼无箍板抗剪强度试验研究 [J].建筑结构学报,1993,14(1):44- 53.HUANG Xiang-cai,WAN Juang,WANG Qing-xiang,et al.Experiments and research on shear strength of RC slab without strrups and subjeted to two equal symmertrically concentrated loads on centre of width [J].Journal of Building Structures,1993,14(1):44- 53.