Experimental Study On Seismic Performance Of Concrete-polystyrene Composite Wall Panels

In order to meet the requirements for energy efficiency in buildings,insulation systems are installed on the external walls of through-length buildings.Due to environmental conditions such as temperature changes and rain erosion,external wall insulation systems are at risk of falling off,posing a safety hazard to urban operations.Concrete-polystyrene composite wall panels（CPC panels）with a set of load-bearing,insulation,enclosure function in one,is an external wall self-insulation system,insulation effect is significant,while overcoming the external wall insulation system is desirable to produce the shortcomings of shedding.The external wall self-insulation system has been applied in the project,but most of the practice is the inner side of the insulation board for the structural layer,the outer layer of concrete protection layer,the middle for the insulation layer,do not consider the protection layer force.In this thesis,we have developed a self-insulation composite wall panel mainly used in single and multi-storey buildings,taking into account various factors such as thermal insulation,load-bearing,fire protection and on-site construction.The concrete surface layer on both sides is connected into a whole to be stressed together.In this thesis,18 concrete-polystyrene composite wall panel specimens were designed and their seismic performance was investigated through proposed static tests,focusing on the seismic mechanism,damage pattern,bearing capacity and the effect of height to width ratio and vertical compressive stress on the seismic performance of the composite wall panel.1.Application of the connectors used in this subject,set at a spacing of 400mm×500mm,can ensure that the concrete layers on both sides of the composite wall slab form a whole and work together under the action of earthquakes.2.The setting of reinforcing longitudinal reinforcement at the end of the wall slab increases the positive section load bearing capacity of the wall slab and plays an important role in improving the seismic performance of the wall slab.3.The damage pattern of the specimen is related to the aspect ratio.For the specimen with the aspect ratio of 1.5:1,under the horizontal loaded action,the positive section damage occurred first,and then the oblique section shear damaged;for the specimen with the aspect ratio of 1:1,the positive section damaged and the oblique section shear damaged occurred almost simultaneously;for the specimen with the aspect ratio of 1:2,the oblique section shear damaged occurred finally,and the positive section damaged did not occur.4.The steel wire mesh limits the development of cracks and improves the shear bearing capacity of the concrete,the horizontal steel wire of the steel wire mesh bears the horizontal shear force,and the steel mesh within the slab is an important factor affecting the seismic performance of the wall slab.5.The ductility of the wall slab has good ductility,the ductility of the specimen is related to the high aspect ratio and axial pressure,the larger the aspect ratio,the larger the ductility coefficient of the specimen;the larger the axial compressive stress,the smaller the ductility coefficient.6.The horizontal lateral load bearing capacity of the wall slab can be calculated by referring to the design of reinforced concrete shear walls,which is safer for specimens with smaller height to width ratios.