Analysis Of Seismic Behavior For The Underlying Framework-Reinforced Insulation Brick Wall

CKBZ thermal insulating brick is a new kind of wall material that has been developed in recent years,it is made of polystyrene material.Using building blocks lap joint,wall reinforcement is configured according to the requirements,vibration-free and self-compacting concrete is concreted in the hole of thermal insulating brick to form an integral wall with insulation and load-bearing.The wall has a variety of excellent performance:energy-saving,low cost,quick construction,land-saving,good integrity,long life span,good seismic property,this wall meeting the social requirements of low-carbon energy.This paper makes a finite element analysis on the seismic property of underlying framework-reinforced insulation brick wall by using ANSYS software,the finite element model is established.Modal analysis,harmonic response analysis and low cycle repeated loading test simulation were carried out to study the influence of different reinforcement form,concrete strength grade,high aspect ratio,rib thicknesses and opening on the seismic property of the wall.The first vibration type of the underlying framework-reinforced insulation brick walls is all bending deformation,wkich means the force on the wall is uniform and reasonable,and torsional stiffness of the wall is greater than the lateral stiffness.Due to the existence of polyphenyl block in the wall,the stiffness of the wall has been weakened.Under the action of X-direction excitation force,the corresponding frequency of the peak displacement of the unperforated wall appears between 0.3Hz and 1Hz.The wall with high ratio of height to width has another larger displacement response between 2Hz?3.5Hz.The frequency corresponding with the peak displacement of the wall with opening were 0.3Hz?1Hz too.Resonance damage caused by loads in this frequency range should be avoided in structural design.The underlying framework-reinforced insulation brick wall is easy to produce stress concentration due to the existence of short ribs,the cracking load of wall is small,the crack occurs in short ribs first and the crack of the wall develops more slowly,the bottom frame first appears through cracks and breaks down.The wall has a full hysteretic curve,good ductility and strong ability to absorb seismic energy;the increase of strength grade of concrete and horizontal steel reinforcement ratio,the lateral stiffness and the the ultimate displacement of the wall can be effectively improved,the ductility coefficient of the wall increased by 8.23%and 3.64%,respectively,the energy dissipation capacity of the wall is obviously enhanced;the improvement of the vertical reinforcement ratio has little effect on the wall performance,on the contrary,the high ratio of reinforcement will be detrimental to the ductility of the wall;the increase of rib thickness can improve the performance of all aspects of the wall,but the effect is not obvious;the initial stiffness of the wall with high height to width ratio is small,but the ultimate displacement and ultimate load are large,and it has better ductility,the ductility coefficient increased by 18.11%and the failure displacement increased by 28.99%;the wall with small height to width ratio has a high speed of destruction,poor energy dissipation capacity and poor ductility,the ductility coefficient decreased by 10.3&and the failure displacement decreased by 13.13%,the wall with opening can seriously reduce the stiffness,obviously weaken the ductility and energy dissipation ability of the wall,the ductility coefficient decreased by 13.33%on average.The comprehensive comparison of the underlying framework-reinforced insulation brick wall,the underlying framework-concrete shear wall and the underlying framework-reinforced masonry wall shows that the underlying framework-insulating brick wall has better ductility and deformability,good energy dissipation capacity and its stiffness degradation is relatively smooth,however,compared with other walls,the ultimate bearing capacity of this wall is poor and its lateral stiffness is relatively less than that of other walls.