Analysis On The Mechanical Performance Of Reinforced Concrete Wide-flat Beam-column Joints Core Area

With the development of the modern economy, there is an increasing demand of the living area for citizens in limited land. But the height of the constructions cannot increase without limitation for various reasons. After in-depth research, scientists have found that using wide-flat beam structure can effectively lower the height of the floor system in constructions. As a result, the wide-flat beam structure has been widely used in construction field because of its advantages of lowering the floor height. The mechanical properties of a wide flat beam frame beam-column joints has a clear distinction between the traditional structure. The present standard is limited in practical engineering due to its abstract definition of design measures in node core area and the strict restriction of the beam-column section. So it is significant to research the seismic performance of the wide-flat beam node both for theoretical and practical purpose.By using finite element analysis software Midas/Gen, the thesis researched the mechanical performance both for traditional and wide-flat beam by comparing the models of two different frame structures with distinct beam sections. In addition, the thesis analyzed the mechanical performance of the wide-flat beam node with the parameters of the strength of reinforced concrete, the axial compression ratio of the columns and the section of the wide-flat beam by using the engineering software Ansys. The main contents are as followed: 1. Using the finite element analysis software Midas/Gen to analyze the models of two different frame structures with the sections of the traditional beam and the wide-flat beam, compare the vibration period, floor displacement and the seismic force respectively, draw the conclusion that the overall stiffness of the wide-flat beam is smaller compared to the traditional beam.2. Using the large-scale general finite element analysis software Ansys, to analyze the mechanical performance of the wide-flat beam node area, under the action of the axial pressure on the top of the column and the antisymmetric load at beam ends, demonstrate the distribution of the crack development in node core area.3. By changing strength of concrete, axial compression ratio and width of the beam section respectively,using the large-scale general finite element analysis software Ansys, to analyze the node area from cracking of concrete to steel bar yielding to node completely destroy the entire process, the carrying capacity and the beam end displacement when the final destruction.