Elastoplastic Seismic Response Analysis Of Assembled Monolithic Special-Shaped Column Structure

With the rapid development of China’s industrial technology,the residential construction and real estate industry is becoming more and more mature.People have higher and higher requirements on the use function and safety performance of residential buildings.China is an earthquake prone area.For a long time,earthquakes of various sizes have caused great losses to the country and people.Experts from various countries have been studying new anti-seismic forms to resist the damage caused by earthquakes.In order to reduce the impact of the earthquake,this paper proposes an assembled monolithic special-shaped column structure,which is based on foam concrete composite wall panels and herringbone composite wall panels,which belong to the category of fabricated structures.The foam concrete composite wallboard takes the frame column as the main load-bearing component,and then foamed concrete as the filling material to pour.The composite wall panel with herringbone brace is formed by adding reinforced concrete herringbone brace inside the wall panel,and the chevrons and frame columns are force-bearing members in the structure.The wall panels are composed of cast-in-place frame columns.The cast-in-place structural columns and vertical frame columns are combined to form special-shaped frame columns of different shapes.The upper and lower frames and the floor work together to form a composite beam,thus forming an assembled integral special-shaped column structure.Herringbone braced composite wall panel can reduce the weight of the structure,bear greater vertical load,and has multiple seismic defense lines,so as to improve the bearing capacity of special-shaped column structure and the ability to resist earthquake.The structure is suitable for multi-storey residence,and the fortification intensity should not be greater than 7degrees.In this paper,the six story assembled monolithic special-shaped column structure is taken as the research object,and the three-dimensional structure model is established by SAP2000 software.The seismic response of the assembled monolithic special-shaped column structure(hereinafter referred to as the special-shaped column structure)and the assembled monolithic special-shaped column structure with herringbone brace composite wall panel(hereinafter referred to as the herringbone brace special-shaped column structure)is compared.The results show that the herringbone brace composite wall panel can increase the seismic response The seismic performance of the structure has obvious effect.The main contents of this paper are as follows:(1)Introduce the basic concepts and seismic theory of special-shaped column structures,and distinguish the difference between hinged and rigid joints in the internal joints of the herringbone-supported composite wall panels.The model is established by theory and reinforcement calculation,and the best position of the herringbone composite wall panel is found.(2)The natural vibration period and frequency of two kinds of assembled monolithic special-shaped column structures are studied by modal analysis,and the influence of composite wallboard on the structure is analyzed combined with the vibration mode shape.Then,the story drift angle between the special-shaped column structure and the special-shaped column structure is obtained by response spectrum and bottom shear method.The results show that the overall stiffness of the special-shaped column structure increases,and the natural vibration period and inter story displacement angle decrease with the addition of composite wallboard.(3)Static elasto-plastic analysis: pushover calculation is carried out in different directions of the structure with uniform load and inverted triangle load mode.The seismic performance of the two structures is understood by analyzing the location of the structural plastic hinge,load displacement curve,performance point and interlayer displacement angle,and the seismic effect of herringbone brace composite wallboard on the overall structure is compared.(4)Dynamic time history analysis: The dynamic elastoplastic time history analysis of the special-shaped column structure and the A-shaped column structure is carried out by using three seismic waves respectively,and the comparison with the static elastoplastic analysis results is carried out.The results of the structure in the elastic-plastic stage have a small gap,which shows that the seismic resistance of the two structures can be analyzed reliably in this paper.