空间钢构架高强混凝土约束机理的试验研究  

Experimental study on constraint mechanism of spatial steel frames to high strength concrete

作　　者：刘尧彬 唐兴荣[1] LIU Yao-bin;TANG Xing-rong(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 205011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《广西大学学报（自然科学版）》2018年第4期1375-1385,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：建设部科技研究项目(99-031-2)

摘　　要：为了进一步探讨空间钢构架对核心高强混凝土的约束机理,以空间钢构架角钢净距、缀条宽度和缀条间距等为设计参数,进行了7个空间钢构架高强混凝土短柱试件在轴向荷载作用下的试验研究。在试验分析的基础上,分析了空间钢构架约束高强混凝土的机理,并对Mander约束本构模型进行修正,提出了空间钢构架约束高强混凝土的本构关系模型。分析表明:轴向荷载作用下,空间钢构架高强混凝土柱破坏始于纵向弦杆(角钢)抗压屈服,峰值荷载时,缀条达到抗拉屈服强度和角钢被压曲,试件具有较高的承载力和变形性能;空间钢构架高强混凝土短柱的轴压承载力大致随着空间钢构架混凝土约束综合影响系数的增大呈线性关系提高。用建议的本构关系对空间钢构架约束高强混凝土短柱荷载—位移曲线分析表明,计算曲线与试验曲线吻合较好。In order to reveal the constraint mechanism of spatial steel frame to high strength core concrete,an experimental research on 7 spatial steel frame high strength concrete columns under the axial load was carried out with the design parameters such as net spacing of the angle steel and width and spacing of the strip.On the basis of experimental analysis,the mechanism of how high strength concrete was confined by spatial steel frame was analyzed.In addition,the Mander restrained constitutive model was modified,and the constitutive model of high strength concrete confined by space steel frame was proposed.The analysis shows that the failure of the high strength concrete column confined by spatial steel frame under the axial load begins with the compressive yield of the longitudinal chord(angle steel),the strip yields and the angle steel buckles when the load peaks,and the specimens have higher bearing capacity and deformability.The axial bearing capacity of the concrete short columns increases linearly with the comprehensive influence coefficient of the spatial steel frame constraints.Based on the proposed constitutive relation,the load-displacement curve analysis of the concrete short column shows that the calculated curve is in good agreement with the experimental one.

关 键 词：空间钢构架混凝土柱 高强混凝土 轴压承载力 约束机理 本构关系 

分 类 号：TU375.3[建筑科学—结构工程]