摘要
为了分析RC框架结构的非线性滞回性能,基于平面8节点单元,本文提出了一个新的针对受循环荷载作用钢筋混凝土的梁柱节点单元.单元中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",节点核心区的力学性能由8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,梁柱与节点之间的剪切由4根剪切弹簧表示.单元具有4个外节点和8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,从而确保本单元能够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.通过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个节点和28个自由度.通过对比试验和模拟分析结果,验证了本模型适合于循环荷载作用下平面框架结构的非线性响应分析.
To analyze the nonlinear hysteretic behaviors of RC frame structures, a new beam-column joint element is developed to model the response of reinforced concrete under reserved cyclic loading based on eight-node plane-stress element. The element edges are divided into ＂joint plane＂ and ＂beam-column plane＂ at the joint-column interface and joint-beam interface, respectively. The inelastic mechanical properties of the joint core are modeled by the eight-node plane stress element. The anchorage failures of beam and column longitudinal reinforcement embedded in the joint are modeled by eight springs between ＂joint plane＂ and ＂beam-column plane＂, and the shears between the above two planes are modeled by four springs. The element has four exterior nodes and eight interior nodes. Each interior node has two degrees of freedom. Each exterior node has three degrees of freedom, which are accordant with the typical beam element, making it appropriate to use the element 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-eight-degree-of-freedom element, with incorporation of the degrees of freedom on the interior nodes to those on the exterior nodes. Comparison of simulated results with test results indicates that the proposed element is appropriate for simulating the response of building joints under cyclic loading.
出处
《力学季刊》
CSCD
北大核心
2016年第4期769-776,共8页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(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
