Research On Seismic Behavior Of Energy-Saving Block Invisible Multi-Ribbed Frame Composite Wall With Different Hole Position

In the 21 st century,many countries have taken various measures to promote green energy-saving buildings,and China is no exception.Under the background of vigorously implementing the green and energy-saving building structure system at home and abroad,the energy-saving block invisible box structure is a new type of energy-saving building structural system that complies with green energy-saving building standards and has a very good development prospect.The energy-saving block&invisible multi-ribbed wall is the core of the structure,which has the advantages of heat preservation and energy saving,light quality and high strength,good seismic performance and so on.In this paper,quasi-static loading tests are performed on the six different openings of the energy-saving block invisible dense-frame composite wall specimens,and the damage status,seismic performance,stiffness and shear capacity changes at each stage of loading are analyzed and studied.The main contents of the study are as follows:1.The quasi-static loading test was performed on the six wall specimens,and the influence of the location of the hole on the hysteresis characteristic,stiffness,ductility and energy dissipation capacity of the wall are analyzed.The failure process of walls can be roughly divided into elastic stage,elastic-plastic stage and failure stage.The hysteresis curve of specimens is full,and has excellent seismic performance and energy dissipation capacity.The ductility coefficients of the six specimens are all greater than 3,which basically meets the ductility standard of the wall structure in the seismic code;The ductility and energy dissipation capacity of the middle opening wall is better than that of the partial opening wall,but the lateral stiffness and shear capacity of oblique section of the wall are reduced.2.Considering the influence of the location of the of the hole on the lateral stiffness and shear bearing capacity of the wall,the formulas for the lateral stiffness and the shear bearing capacity of the wall at different openings are obtained.The calculated value obtained by the formula agrees well with theexperimental value,and the formulas meet the requirements of calculation accuracy and practical application.3.Based on the characteristic points of the load-displacement curve obtained from the test,a degenerate four-line type restoring force model of the open-hole composite wall is proposed,which can reflect the stage degradation characteristics of the stiffness of the specimen during the test.The skeleton curve determined from the calculated values of the skeleton curve feature points was compared with the experimental skeleton curve,It is found that the skeleton curve is in good agreement,which can provide some reference for the engineering design and calculation.