钢筋混凝土异形截面梁柱体系受力性能和设计方法研究

Reinforced concrete frame system with irregular cross section is newly developed in recent years in order to meet the needs of beautiful and smooth in side of the room. For this practical structural system, the cross section types of beams and columns are mainly T shape, L shape or + shape. These are called irregular cross sections distinguishing usual rectangular section. There is only one or no symmetry axis for the irregular cross section. And ere reinforced concrete structure are cracked under the action of working loads. Neutral axis are usually not perpendicular to the total moment of the cross section. In this research project, nonlinear analysis functions of reinforced concrete arbitrary cross-section are derived under the action of biaxial bending and compression. The total path is traced from primary loading to ultimate state. The ultimate load and the position of the neutral axis is analyzed. It is compared with experimental data and corresponding well. The cross-sections are analyzed with concrete constitutive laws from Chinese code, CEB model code and Hognestad's model separately. The simple design method is suggested. A numerical method to analyze reinforced concrete columns under bieccentric loading is presented. Both material nonlinearity and geometric nonlinearity are taken into account simultaneously. The constitutive laws of concrete and steel bar are simulated by cubic or quadratic curves. The derived elemental stiffness is simple addition of the material nonlinear stiffness, geometric stiffness and interaction component matrix. The standard elemental model derived here is compatible with other finite element models. The theoretical results agree well with the experimental data.

研究钢筋混凝土异形截面梁柱在压、弯、剪、扭单独和复合作用下的强度、稳定性、刚度、延性等性能并提出工程设计方法，为异形截面梁柱的工程设计提供科学依据，改善以往设计异形截面梁柱体系采用的凭经验估算的落后状态，进而提高结构整体可靠性和经济性。让工程师们放心的设计与周围环境协调的特色建筑物。