沙漠砂混凝土框架空间角节点抗震性能分析  

Seismic performance analysis of space angle joints of desert sand concrete frame

作　　者：李敏 朱燕芳[2] 李志强[1] 张俊龙[1] LI Min;ZHU Yanfang;LI Zhiqiang;ZHANG Junlong(College of Water Conservancy and Construction Engineering,Shihezi University,Shihezi 832003,China;College of Civil and Architectural Engineering,Nanchang University of Engineering,Nanchang 330099,China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003 [2]南昌工程学院土木与建筑工程学院,江西南昌330099

出　　处：《混凝土》2023年第3期19-25,共7页Concrete

基　　金：国家自然科学基金(51668053);兵团科技创新人才计划项目(2021CB043)。

摘　　要：为得到沙漠砂混凝土空间角节点的抗震性能,利用ABAQUS有限元软件建立6个沙漠砂混凝土空间角节点、1个沙漠砂混凝土平面角节点和1个普通砂混凝土空间角节点模型,通过滞回曲线、骨架曲线、耗能和延性系数等,研究了不同材料、不同节点形式、不同轴压比与配箍率对梁柱节点抗震性能的影响。研究结果表明:沙漠砂混凝土角节点的初始刚度与延性系数比普通混凝土节点均大约7%和9%。平面节点与空间节点的初始刚度、延性系数和屈服点至极限点承载力余量相近,但极限载荷与变形能力储备比空间节点分别小约3%和9%。轴压比从0增加至0.6,试件平均初始刚度增大约42%。柱子的配筋率从1.54%增加至3.08%时,试件的平均屈服荷载、平均极限荷载和变形能力储备分别增加约13%、21%和35%。节点破坏位置发生在梁柱交界处柱子的四角,此处混凝土最容易脱落。In order to obtain the seismic performance of desert sand concrete spatial corner joints,the finite element software ABAQUS is used to establish six desert sand concrete spatial corner joints,one desert sand concrete plane corner joint,and one ordinary sand concrete spatial corner joint models.The influence of different materials,different joint forms,different axial compression ratios,and stirrup ratio on the seismic performance of joints was studied through the obtained hysteretic curve,skeleton curve,energy dissipation,and ductility coefficient.The results show that the initial stiffness and ductility coefficient of desert sand concrete corner joints are about 7%and 9%higher than that of ordinary concrete joints.The initial stiffness,ductility coefficient,and bearing capacity margin from yield point to ultimate point of plane joint and space joint are close,but the ultimate load and deformation capacity reserve are 3%and 9%less than that of space joint,respectively.When the axial compression ratio increases from 0 to 0.6,the average initial stiffness of the specimen increases by about 42%.When the reinforcement ratio increases from 1.54%to 3.08%,the average yield load,average ultimate load,and deformation capacity reserve of the specimens increase by about 13%,21%and 35%,respectively.The failure position of the joint occurs at the four corners of the column at the junction of beam and column,where the concrete is most likely to fall off.

关 键 词：空间角节点 沙漠砂 抗震性能 轴压比 配筋率 

分 类 号：TU528.01[建筑科学—建筑技术科学]