钢筋混凝土梁的弯曲性能尺寸效应试验研究

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发布时间：2021-12-06

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摘要:进行了抗压强度为 46. 5~50.6 MPa,截面高度为250~ 1 000 mm的钢筋混凝土试件弯曲性能试验。与相同
尺寸和配筋的高强混凝土试件(n= 72. 1~72.4 MPa)的试验站果进行了对比分析，从受曹承载力和变形能力两个
方面研究了铜筋混凝土试件的受审性能尺寸效点。研究表明,裁面尺寸的变化对钢筋混凝土构件的名又开裂弯矩，
嚴服弯矩和极限專矩没有明显影响,对位移延性和塑性较区塑性转动能力有显著影响，试件的位移延性乐数和塑性
校转动能力随藏面高度的减小雨成小，并且普通混凝土试件和高强混凝土试件的见寸效应规律基本相同,与混凝土
强度无关。试验结果表明,不同混凝土强度和截面高度试件的塑性校区长度均为1倍截面有效高度。
关键词:钢筋混凝土梁;尺寸效应;有曲性能;延性;柿动能力
中圈分类号:TU375.1I;TU317.1文献标志码:A 文章编号 674740151002205
Experimental Study on Size Effect of Flexural Behavior
of Reinforced Concrete Beams
Che Yi', Chen Zhixin'-*, Song Yupu' ，Huang Zhiyu's
(1. Faoulty o Infastroture Enginering, Dalin University of Technology, Dnlin 116046, Linoning, P. R. Chin;
2. Dnulian Institute of Urban and Architeture Design Ca，Lid, Dalien 16021, Linning, P. R. Chine;
3. School of Cil Engieering, Dxlian Ntionlities Univeraity, Dalin 16600 Linoeing, P. R. China)
Alstrned: Rinforced concrete specimens with conerete compresie strength varied from 46.5 to 50. 6 MPa and with depth of
cross section froron 250 mm t如1 000 mm subjected 如o bending were tested. Suze efeets of flexural bchavior with respect to
bending canpacity and deormation eapncity were investigated based on the analysis of the test resuts and those of higrstrength
specimens (fu - 72.1~72.4 MPa) of which the geometry and reinforement lnyouts were identical to those of specimens tested
in this study. It is shown that beam depth does not has any apparent influence 明n noninal eracking moment. noninal yield
momert and nominal ulimnate monent, and that it has signifianot influence on displacement duetilty and plastie rotation capacity
of plastic hinges of menbers. For norma-strength concrete specimens and bigrstrength concrete specimens+ both the
displaeenent ducility and the platie rotatio capacity decrease with the inereasing of depth in the similar wayso and are
independent of concrete strength. It is also demonstrated that the lengths of plastie hinges of members with dfferent depth and
concrete strength are approximately equal t如o the depth.
Key wardscinfored conerete beam; sixe fft flexural behavior; duetility: rotation eapeity
研究表明,混凝土作为一种准胞性材料的力学性能存在
应田,但少数研究者10)认为存在尺寸效应而对于位移延
尺寸效应，相应地混凝土构件的- -些力学和变形性能也存在
性和型性铰区转动能力.大部分研究表朋试件的尺寸效应很
尺寸效应，因此在某些特定的情况下根据小尺寸试件试验鋪
明显(41,但Alca等0的研究认为无明显尺寸效应。车轶
果建立的构件性能计算方法应用到大尺寸构件设计时,往往
等0n采用中间带有短桂的梁式试件櫝拟框架梁梁端的受力
不够准确也不科学w0。近年来, 各国学者对无腹筋和配置
特征,进行了梁高250~ I 000 mm的高强混凝土(C70)梁的
少量箍筋混凝土粱.以及厚板等构件的受剪承载力尺寸效应
弯曲性能试验。试验研究结果表明，戴面高庞对构件的名义
进行了较深入的研究,并取得了较大进展r0。相比之下,人
开裂弯矩、名义屈服弯矩和名义极照弯矩没有明显影响，而
们对钢箱混凝土构件受弯性能尺寸效应研究相对较少，井且
构件的位移延性系数和塑性饺的塑性转角则存在明显的尺
得出的结论崗不统- -.
寸效应。
对于曼弯承载力，多数研究认为不存在明显的尺寸效
文章在文献[18]研究基础上,进一步开展了普通混凝土