|
SRC (Steel reinforced concrete, referred as SRC) is the structure that refers to the main configuration (rolling or welding molding) and a certain amount of vertical force and horizontal stirrups reinforcement in the concrete beam. It is a main form of steel and concrete composite structure. Because of high bearing capacity, stiffness, and components section of small size, good ductility and energy-performance advantages,SRC is especially applicable to the earthquake zone, and more advantageous to be used in the high-level and ultra-high-rise building . At present, whether in China or in Europe, America , Japan.et, the application and promotion of SRC structure have become increasingly widespread. Therefore, it is very importantly significant to deply study SRC,grasp its structural performance, and fully applied it to engineering practice,.To SRC ,the design and calculation of nodes is a key issue. Nodes are the key parts to connect beams and columns . Without these Nodes ,the internal forces of beams and columns can not be passed through. So safe and reliable of the nodes’ job is a premise to ensure the structral normal work. Because of the complexity Stress, nodes usually are in bending-shear composite stress state, so it is very important to research and find out the nodes’ tress performance and failure mechanism, to make the nodes’ design have a clear pass-force , reliable calculation ,reasonable structure. In the complex earthquake, it is more important to attach the rational- right design of the nodes.In this paper, three forms of SRC beam-column connections was detailedly analysed by the use of large general-purpose finite element software -ANSYS framework and the distribution of its stress, strain and concrete cracks were studied. At the same time, the influencing factors about the bearing capacity of three types of nodes’ structural forms was respectively analysed .The main job of this article reads as follows.First,three types of structural nodes about steel - SRC column frame , reinforced concrete beams - SRC column frame and SRC beams - steel reinforced concrete column frame were studied by the finite element analysis software ANSYS. Using the discretizated model of discrete finite element , different modules were respectively chose to steel, reinforced concrete.The parts of reinforced concrete made use of the modulars of the combinations (the fourth, fifth chapters) and the overall style (Chapter VI) to simulate its force performance under load. The distributed map about stress-strain of concrete and the situation map about cracks of concrete were drawn up.Then the nodes’ failure mode was drawn up from the analysis of stress-strain distribution map about concrete and steel . At last calculating different models ,the influence about stiffened plates, steel webs, axial compression ratio, shear span ratio and concrete strength to the force of nodes’ performance was analysed.
|