摘要
以经典弹塑性力学与非线弹性力学为理论依据,结合钢管与混凝土材料性能,建立了新型圆钢管混凝土轴压短柱力学模型,并以此模型为基础推导并编写数值计算分析程序。结合该力学分析模型与程序对钢管混凝土短柱轴压受力全过程进行理论分析,研究了钢管混凝土试件在外部荷载作用下的受力特性,钢管竖向、环向应力变化规律,约束核心混凝土的力学性能以及钢管与核心混凝土之间相互作用的发展规律。研究结果表明:计算得到的荷载-变形关系全曲线与试验结果吻合良好,理论分析结果较为合理;钢管竖向应力先增大后降低最终趋于平缓,环向应力在整个过程中不断变化;内部核心混凝土受围压变化的影响,其轴向应力-应变关系异于恒定围压条件下的混凝土应力-应变关系;套箍系数对核心混凝土强度提高有明显影响,而试件径厚比可有效改善约束混凝土的受力-变形关系。
Based on the properties of steel tube and concrete,a novel mechanical model of the axially loaded concrete filled circular steel tubes（CFCST）stub column was derived from the typical elasto-plasticity and non-linear elastic mechanics.Based on the mechanical analysis model,the new numerical analytical procedure was also developed.The mechanical model and related program were adopted to analyze the entire process of axially loaded CFST in theory.The mechanical behavior of concrete filled steel tubes specimen under external loading,the developments of steel tube＇s axial and hoop stresses,the mechanical performance of confined core concrete and the interaction between the outer tube and core concrete were investigated.Theresults show that the calculated entire load-deformation curves are in line with the test ones and the results from theoretical analysis are reasonable.It is also found that the vertical stress of steel tube increases firstly then declines and keeps smooth finally.The hoop stress keeps varying during the whole period.The internal core concrete is influenced by the change of confining pressure.Its axial stress-strain relationship is different from that of concrete under constant confinement.The constraining factor has a significant influence on the core concrete strength enhancement,while the diameter-to-thickness ratio can effectively improve the stress-strain relationships of confined concrete.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2016年第5期75-83,94,共10页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51408346)
中国博士后科学基金项目(2015M58116)
青岛市博士后科学基金项目(2015196)
山东科技大学人才引进科研启动基金项目(2014RCJJ042)
山东省科技惠民计划项目(20014KJHM0212)
关键词
桥梁工程
圆钢管混凝土
非线性固体力学
轴压性能
受力-变形全曲线
bridge engineering
concrete filled circular steel tube
nonlinear solid mechanics
axial compression performance
entire load-deformation curve
