MDOF Substructure Pseudodynamic Testing And Nonlinear Seismic Response Analysis Of Frame-supported Reinforced Masonry Shear Wall

The study of this dissertation focuses on the seismic performance of a new complex tall building-FSRMW (frame-supported-reinforced-masonry-shear-wall). The new structure combines the advantages of RMW(reinforced-masonry-shear-wall) and FSRCW(frame-supported-reinforced-concrete-shear-wall) and have good economic value and extensive use value.Big space can be gained by using the structure,which provide a new appropriate selection for the design of hotel, multifunctional office building and dwelling house with shop at bottom.Simple and model similarity theory and MDOF Substructure pseudodynamic testing were adopted to carrying out the seismic testing of 1:4 Reduced-scale models of FSRMW,and FEM software ANSYS was applied to perform the nonlinear seismic response analysis of the structure.The main research achievements may be summed up in the following aspects: 1 Integrated simple and complete model similarity theory of this structure is set up in this paper.Selection about model reinforced masonry materials is presented when simple similar model is adopted in testing.Correlations between model and prototype results in basic strength characteristics of masonry prism are reported based on theory analyse.This includes axial compression,joint shear for ungrout prisms and grout prisms. These model testing indicated that the structure adopting simple similarity model can accord with the prototype masonry prisms results. The monotonic shear testing of two-story model reinforced masonry shear wall in different compressive force was performed. The testing results showed that the model structure can accord with the prototype masonry walls results.The shear bearing capacity of model structure is 0.94 times larger than prototype structure without axial compressive force. The shear bearing capacity of model wall is 1.08 times larger than prototype wall when the axial stress equal to 1.5 MPa .Model testing and theory foundation adopting simple similar model is erected for reinforced masonry structure . 2 Substructure pseudodynamic testing is considered as the most available test method.But the PSD tested part of the testing structure is generally SDOF structure now. Seismic testing which the PSD tested part and the numerically operated part are both MDOF have been carried out on a new structure-Frame-supported reinforced masonry shear wall.The testing are cited to illustrate that the Substructure pseudodynamic testing which the PSD tested part adopted MDOF not only can obtain dynamic performance of the whole structure,but also allow the structure choose its own displacement and force distributions under the influence of earthquake excitation,and the testing method can obtain different story drift-story shear relations of different stories. Therefor,the substructure pseudodynamic testing which the PSD tested part and the numerically operated part are both MDOF was an more effective tool investigate the seismic behaviour of complex tall building. 3 Servo-hydranlic control system of MDOF pseudodynamic testing have the phenomena of coupling which can lead the true lateral stiffness to be obtained difficultly.A new measure method of story lateral stiffness is performed. Calculate formula of story lateral stiffness of FSRMW is erected. The analysis results showed that the calculate results can accord with the testing results. 4 Seismic evaluation of of 1:4 Reduced-scale models of FSRMW has been carried out by substructure pseudodynamic testing which the PSD tested part and the numerically operated part are both MDOF.The dynamic response of the tested structure under the influence of earthquake excitation is analyzed.The horizontal bearing capacity and the damage degree of the test model are is investigated. The testing are cited to illustrate that the Seismic performance of the structure(frame-shear-wall-supported reinforced masonry shear wall) is better than that structure(frame-supported reinforced masonry shear wall) and can be satisfied with the design request of 6-8 degree seismic zone. Lateral stiffness ratio is a significant factor of the seismic performance of FSRMW.The value of lateral stiffness ratio will influence on the place of weak story,elastic-plastic distortion and failure characteristic.It is suggested that lateral stiffness ratio is selected between 1.3~2. 5 Nonlinear elastic-plastic-fracture model was adopted to perform the nonlinear seismic response analysis of the new structure.The study revealed that FEA analysis suitably obtained seismic response of FSRMW,and the method can consider stiffness degradation of supper structure and the influence of overturn moment and overcome the defects of Substructure pseudodynamic testing. Based on testing and FEA,total story number conservative limit of FSRMW in 6,7,8 degree seismic zone is suggested to be 15,12 and 9. Total building height conservative limit of FSRMW in 6,7,8 degree seismic zone is suggested to be 45m,36m and 27m. equivalent lateral stiffness ratio of frame-shearwall(two stories in bottom)-supported-reinforced-masonry-shear-wall is suggested to be 1~1.6.