纤维增强混凝土梁柱节点受剪承载力计算模型

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发布时间：2022-05-10

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普通混凝土梁柱节点由于节点区配箍率大、钢筋拥挤而施工不便。纤维增强混凝土材料
(FRC)开裂后具有较强的桥接能力因而抗拉性能较好，可以替代部分或全部箍筋。基于前人对钢
筋混凝土梁柱节点抗力机制的研究，提出了节点核心区采用 FRC材料节点的计算模型，即斜压杆
机制和软化桁架机制承担的水平剪力按一定比例组合的计算模型。将该计算模型节点受剪承载力
计算值与试验值进行比较，结果表明：对低轴压比的试件，稍有保守，对高轴压比的试件，二者吻合
较好。基于该计算模型的节点受剪承载力计算方法既可以进行节点核心区受剪承载力计算，还可
以分别验算节点核心区 FRC抗压强度和水平配箍率是否满足设计要求，具有较好的实用性。
关键词：梁柱节点；纤维增强混凝土；斜压杆机制；软化桁架机制
中图分类号：TU375．4 文献标志码：A 文章编号：1674—4764(2014)03—0099—07
Analysis of Fiber Renforced Concrete Beam—Column Joints M odel
Wang Yingjun，Liang Xingwen，Li Fangyuan，Wang Hai
(School of Civil Engim~ering，Xi'an University of Architecture& Technology，Xi'an 710055，P．R．China)
Abstract：Due to the large stirrup ratio and reinforcement congest in beam—column joints，the ordinary
reinforced concrete beam—column joints take inconvenience to construction．Cracked fiber renforced concrete
(FRC) has strong bridge ability and better tensile performance SO that it can replace part or all of the
stirrups． Based on previous researches on resistance m echanism of reinforced concrete i oints，a new m odel
using FRC materials in the core zone of beam—colum n ioints iS presented． It iS a kind of model in which
horizontal shear supported by the diagonal strut mechanism and softening truss m echanism with a certain
percentage． The calculation results of the model is compared with the existing test results． It is a bit
conservative to specim ens with low axial load ratio． H owever，the results are in line with the specimens
with high axial load ratio．Therefore，the results totally demonstrate the rationality of the proposed model
in this paper．Meanwhile，according to the proposed model，the shear capacity of beam—column joints can
be not only calculated，it also check whether FRC compressive strength in core zone of joints and horizontal
stirrup ratio m eets design requirem ents，which has a higher practicability．
Key words：beam—column joints；high performance fiber reinforced concrete (FRC)；the diagonal strut
m echanism ；the softening truss mechanism