摘要
为分析RC框架结构在循环荷载作用下的非线性滞回性能,提出一个新的钢筋混凝土梁柱节点单元——"超自由度单元".单元在梁与节点交界面和柱与节点交界面被划分成"节点截面"和"梁柱截面",节点的力学性能由4节点单元描述,而梁柱受力钢筋与节点核心区的粘结滑移由存在于"节点截面"和"梁柱截面"之间的8根弹簧控制.单元具有4个外节点和4个内节点,每个内节点具有2个自由度,每个外节点具有3个自由度,该3个自由度与普通梁单元一致,从而确保本单元适合于同普通一维梁柱单元一起进行钢筋混凝土结构平面非线性分析.将内节点上的自由度依附到外节点上,单元在数值表现上具有4个节点20个自由度.通过试验和模拟分析结果对比,结果表明:结构极限承载能力和滞回曲线的捏拢特性都能被单元很好模拟,同时计算机的运行时间非常少.本模型适合于进行循环荷载作用下平面框架结构非线性响应分析.
To analyze the nonlinear hysteretic behaviors of RC frame structures under reversed cyclic loading, a new element of reinforced concrete beam-column joints, super DOF element, was presented.The element edges were divided into ＂joint plane＂ and ＂beam-column plane＂ at the joint-column interface and joint-beam interface.The inelastic mechanism of joint core was represented by the four-node plane stress element.The anchorage failures of beam and column longitudinal reinforcement embedded in the joint were determined by eight springs between ＂joint plane＂ and ＂beam-column plane＂.The proposed element has four exterior nodes and four interior nodes.There are two degrees of freedom on each interior node.There are three degrees of freedom on each exterior node, coinciding with ones of typical beam element, so the element is suitable for use together with typical hysteretic beam-column line elements in two-dimensional nonlinear analysis of reinforced concrete structures.The element is implemented as a four-node twenty-degree-of-freedom element through moving the degrees of freedom on the interior nodes to ones on the exterior nodes.The simulated data were compared with tests, and the results indicate that the ultimate strengths and hysteretic pitching behaviors analyzed by the element are well agreement with the test ones and the computer time is short.It concludes that the proposed element is suitable for use in simulating response of building joints under cyclic loading.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2017年第6期53-57,共5页
Journal of Harbin Institute of Technology
基金
国家自然科学基金面上项目(51378313
51578336)
关键词
梁柱节点单元
钢筋混凝土
框架结构
循环荷载
非线性分析
滞回性能
beam-column joint element
reinforced concrete
frame structures
reversed cyclic loading
non-linear analysis
hysteretic behaviors
