Study On Seismic Performance Of Prefabricated Multi-ribbed Composite Wall

There are numerous potential disadvantages existing for pre-existing precast wall,such as excessive dead load,amounts of wet work on site,easy craze,lack of construction efficiency and high cost.Therefore,it has a great significance to carry on relevant researches on novel precast walls which have such properties as lightweight,high strength and economic,meanwhile,it is significant for promoting the construction industrialization.The multi-ribbed composite wall is a composite wall composed of autoclast sand aerated block and reinforced concrete,which has a certain bearing capacity and energy dissipation capacity,and it can be used for the load-bearing wall of low-rise buildings or the infilled wall of frame structures.However,the relevant researches are still scare at present.In order to study on the mechanical performance of the multi-ribbed composite wall when it is used as a load-bearing wall,in addition,analyze the influence of the multi-ribbed composite wall when it is used as the infilled wall of frame structures,experimental tests and finite element analysis on the multi-ribbed composite wall were carried out.The main research contents and conclusions are as follows:(1)Quasi-static tests on four precast multi-ribbed composite wall were carried out.The failure characteristics,lateral ability,hysteresis behavior,lateral stiffness,deformation behavior and energy dissipation capacity were analyzed considered the influence of the reinforcement ratio of the rib column and the sash size.The results revealed that the lateral force was 100 k N～153 k N,the hysteretic curve was relatively full,and the specimens had a good energy dissipation capacity;the ultimate displacement angle was 1/83～1/46,and the displacement ductility coefficient was6.92～8.07,indicating that the specimen had a good deformation capacity.Increasing the reinforcement ratio of the rib column and adopting a small size of sash could improve the lateral resisting ability,lateral stiffness and deformation capacity of the specimens.(2)Numerical simulation analysis on the precast multi-ribbed composite wall were conducted using the universal finite element software ABAQUS.The simulation results showed that the experimental skeleton curves and simulated skeleton curves had a good agreement in the elastic stage.The maximal loads of the finite element analysis were larger than the test ones,the relative error was 4.04% ～11.78%.Based on YZMLW-3,finite element parametric analysis on the influence of the axial load and existing hole were carried on.The results showed that axial load can improve the bearing capacity of the specimens,nevertheless,the ductility of the specimens were reduced.In case the hole was existing in the wall,the lateral load resistance and ductility of the specimens were reduced.(3)The initial stiffness calculation method which suitable for the precast multi-ribbed composite wall was proposed in this paper.Based on the working mechanism of the infilled wall in the frame structure,the rational value of the stiffness when the wall was used as the infilled wall of the frame structure were studied.Furthermore,and the formula between the reduction coefficient relative φ(compared to the initial stiffness)and the story drift was presented,which provides the design basis for the multi-ribbed composite wall used as infilled walls in the frame structure.