集中荷载作用下矩形钢管高强混凝土上翼缘工字形梁屈曲分析  

BUCKLING ANALYSIS OF THE I-SHAPED BEAMS WITH RECTANGULAR HIGH-STRENGTH CONCRETE-FILLED STEEL TUBULAR UPPER FLANGE UNDER CONCENTRATED LOAD

作　　者：姜良芹[1,2,3] 贺玲婕[1] 李韵豪 林钰博 王维宸 计静 JIANG Liangqin;HE Lingjie;LI Yunhao;LIN Yubo;WANG Weichen;JI Jing(Heilongjiang Key Lab of Disaster Prevention,Mitigation and Protection Engineering,Northeast Petroleum University,Heilongjiang Daqing 163318,China;Key Laboratory of Stmctural Disaster and Control of the Ministry of Education,Harhin Institute of Technology,Harbin 150090,China;Key laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150086,China)

机构地区：[1]东北石油大学,黑龙江省高校防灾减灾工程与防护工程重点实验室,黑龙江大庆163318 [2]哈尔滨工业大学,结构灾变与控制教育部重点实验室,哈尔滨150090 [3]中国地震局工程力学研究所,地震工程与工程振动重点实验室,哈尔滨150086

出　　处：《低温建筑技术》2021年第12期93-97,共5页Low Temperature Architecture Technology

基　　金：国家自然科学基金面上项目(51178087);黑龙江省自然科学联合引导基金项目(LH2020E018);哈尔滨工业大学结构灾变与控制教育部重点实验室开放基金项目(HITCE201908);中国地震局工程力学研究所基本科研业务费专项资助项目(2020D07);东北石油大学引导性创新基金项目(2020YDL-02)。

摘　　要：为获得矩形钢管高强混凝土上翼缘工字形梁的屈曲荷载和屈曲模式,文中共设计14根简支梁,考察主要参数为混凝土强度等级、钢管翼缘高宽比、腹板厚度及高度、加劲肋和跨度。利用ANSYS软件建立有限元模型,对14根简支梁开展特征值屈曲分析,获得组合梁的前5阶屈曲荷载和模式,明确混凝土强度、钢管翼缘高宽比、腹板厚度及高度、加劲肋和跨度对屈曲荷载的影响规律。结果表明增加钢管翼缘高宽比、减小跨度及设置加劲肋均会显著提高梁的屈曲荷载,增加腹板的厚度对梁的屈曲荷载影响不明显,增加腹板高度和提高混凝土强度并不能有效提高梁的屈曲荷载。为进一步开展该类组合梁的非线性屈曲分析奠定基础。In order to obtain the buckling load and buckling mode of the I-shaped beams with rectangular highstrength concrete-filled steel tubular upper flange, a total of 14 simply-supported beams are designed with the concrete strength, height-width ratio of the steel tubular flange, the thickness and height of the web plate, stiffener, and span as the main parameters in this paper. The eigenvalue buckling analysis of 14 simply-supported beams was carried out through the finite element model established by ANSYS software to obtain first five order buckling load and buckling modes of the composite beams, in which the influence regularities of concrete strength, height-width ratio of the steel tubular flange, the thickness and height of the web plate, and stiffener and span on the buckling load were studied. The results show that the buckling load of this kind of beams can be significantly improved by increasing height-width ratio of the steel tubular flange, reducing the span, and setting the stiffeners, while the thickness of web plate has little effect on the buckling load. And the buckling load of beam fails to be effectively improved by increasing the height of web plate and the strength of concrete. The paper lays a foundation for the further nonlinear buckling analysis of such composite beams.

关 键 词：矩形钢管混凝土 上翼缘工字形梁 特征值屈曲 

分 类 号：TU311.41[建筑科学—结构工程]