Research On Seismic Performance Of The Outer Frame-multi-grid Composite Shear Wall Structures

Nowadays, people pay comprehensive attention to seismic performance ofbuildings due to the severe damage caused by earthquakes which happen frequently inrecent years. By studying the seismic damage situations of ordinary frame structuresunder strong earthquake motions and the trend of the development of seismicperformance, and by referring to related research achievements of the frame-multigrid composite wall structures, a new type of multiple resistance lateral forcestructure stress system-the outer frame-multi-grid composite shear wall structure wasproposed in this thesis, which comprises the invisible framework, the rib-beam, therib-column, the shear wall, and the infilling coal ash blocks, that do not increase theconstruction cost greatly,and the whole seismic performance of the frame structure isimproved effectively. There is an extensive application outlook and the developmentspace for the structure in our country. Therefore, the study of the seismic performanceof the outer frame-multi-grid composite shear wall and its design calculation methodhas engineering significance and ecological value.In this thesis, the outer frame-multi-grid composite shear wall is mainlydiscussed. The seismic performance of this wall, the calculation formula of itsultimate shear capacity and the factors affecting the shear capacity are studied bymeans of numerical simulation and theoretical analysis. The main works andachievements of this thesis are as follows:Firstly, ABAQUS, ANSYS are selected to simulate the experimental models inliterature [27]: KW-1which is empty frame space frame, KW-2which is multi-ribbedcomposite wall. The result evaluated by ABAQUS, ANSYS was compared with thetest result in order to testify that whether ABAQUS can effectively conduct nonlinearanalysis of ordinary multi-grid composite wall (containing three materials of greatlydifferent mechanical properties: steel, concrete, and filling block).Secondly, the outer frame-multi-grid composite shear wall structure (KW-3) wasmodeled and evaluated via ABAQUS. Its result was compared with test experimentresults of the model KW-2(the common multi-grid composite wall). The bearingcapacities, the stiffness-displacement angle curves, the initial stiffness, the crackingloads, the ultimate loads, the ductility,the crack developments, and the concrete andreinforced stresses of both models were compared and analyzed. Thirdly,the influences of the change of structural style of the outer frame-multi-grid composite shear wall structure (i.e. The form change of rib beam, the quantityand the rib column frame space) on its shear capacity, stiffness and ductility werestudied.Fourthly, the equation of the ultimate shear capacity of the outer frame-multigridcomposite shear wall was derived. The major influential factors of the ultimate shearcapacity are discussed, which mainly include shear span ratio, axial compression ratio,the strength of filling block and concrete, rib beam longitudinal reinforcement, ribcolumn longitudinal reinforcement, shear walls reinforced, outside frame column, etc.The validity of this derived equation was testified by contrast the analytical resultobtained through using ABAQUS with the calculated result using the mentionedequation.Finally, the utilization of the frame-multi-grid composite shear wall in realprojects were discussed, the shear capacities, stiffness, ductility and the stresses ofreinforced concrete of the frame-multi-grid composite shear wall and the framestructure, the frame–composite wall structure were compared with ABAQUS.