Study On Basalt Fiber Reinforced Soil Wall Resistance Seismic Performance

The buildings with simple structure are the most common in the reside ntial buildings in southwest China.The southwest area is mainly located i n seismic zones and has frequent earthquakes.The friction and inlay actio n of the mortise and tenon joints of the wooden frame can absorb the exter nal seismic force of the input structure.In this paper,a new type of viscoe lastic damper is proposed and installed on the mortise and tenon joints of the wooden frame through the bucket.The mechanical performance of the new type of damper is studied,and then th e seismic performance of the mu lti-node wooden frame reinforced by the damper is studied.A new viscoela stic damper was applied to the tenon and tenon joints of the wooden frame to change the force mechanism of the joint area.The low cycle reciprocat ing test was carried out to analyze the seismic performance of the wooden frame before and after reinforcement.(1)The physical and mechanical properties of the material are analyze d from the macroscopic and microscopic perspectives of wood,and the fri ction and inlaid pressure of the mortise and tenon joints of wood are analy zed.After the viscoelastic damper is applied to the mortise and tenon join ts of the wooden structure through the hopper,the force mechanism is cha nged into the joint force mode of fricti on force,inlaid pressure and viscoe lastic damper.(2)ABAQUS finite element software was used to establish a fan-shape d viscoelastic damper finite element model.Finally,the simulation results were compared with the experimental results.The maximum erro r of the t wo groups of data was less than 10%,which verified the reliability of the model establishment.A new Keti-type viscoelastic damper was proposed b ased on the stress nephogram simulated by the sector viscoelastic damper and the stress theory of th e damper,and a finite element model of the new type of damper was established.The relevant parameters of the simulation results of the traditional sector viscoelastic damper and the new Keti-type viscoelastic damper were compared.Under the same loading condition,th e maximum difference rate of total energy dissipation is 1.3% and the max imum difference rate of peak load is 6.27%,which indicates that the optim ization of the new Queti viscoelastic damper shape is reasonable.(3)A total of 6 viscoelastic dampers were made for low cycle reciproc ating loading test,and the effects of deformation,loading frequency,damp ing material,fatigue performance and connection mode on the performance of the new Queti type viscoelastic dam pers were studied.The results sho w that the deformation amplitude has obvious influence on the damper,an d the hysteretic curve becomes full gradually in the whole loading process.The hysteretic energy dissipation increases slightly in the early loading p eriod,while the hysteretic area increases more and more obviously in the l ate loading period.When D=10mm and D=65mm,the total energy dissipati on is 0.022 KN.The hysteresis curves,total energy dissipation,equivalent damping ratio and skeleton curves o f damper specimens with different rub ber materials are basically the same.The loading frequency has no great i nfluence on the mechanical properties of the specimen,and the hysteretic curves of each frequency almost coincide.The maximum damping force di fference is 6.2% in the positive direction and 4.8% in the negative directio n.The loading frequency has little influence on the mechanical properties of the new damper.The new damper has no obvious hysteretic curve area a ttenuation and low cycle fatigue.The negative bending moment relative ra tio between completely fixed connection and hoop connection of the damp er has the largest difference,and the difference rate is 33.6%.Therefore,hoop connection can still exert most of the energy dissipation effect of the damper.(4)We designed and produced two trusses of 1:1 full size pine perfora ted wooden structural frame,one of which was a trusses of the perforated exterior plane frame and the other was a trusses of the perforated interior plane frame.We studi ed the seismic performance and mechanism of the pe rforated wooden frame mortise-and-tenon joints before and after reinforce ment with a new viscoelastic damper.The first stage of low-cycle reciproc ating loading test was carried out on the unreinforced wood en frame speci men.After the restoration treatment,a new viscoelastic damper was instal led,and then low-cycle reciprocating loading was carried out.The experim ental results of load-displacement hysteresis curve,skeleton curve,stiffne ss degradation curve,deformation capacity and node strain curve of each wooden frame were obtained.The study says: Under the same loading disp lacement amplitude,the hysteretic curve of the installed viscoelastic damp er is fuller than that of the uninstalled viscoelastic damper,and under larg e loading displacement,The energy dissipation area before and after the re inforcement of the external wooden frame is 146.718 KN.m and 445.446 KN.The energy dissipation area before and after the reinforcement of the inte rnal wooden frame is 395.081 KN.It is of practical significance to improve the seismic performance of the wooden frame by installing viscoelastic da mpers,which provides a certain reference value for the subsequent researc h and application of viscoelastic dampers.