| The multi-ribbed composite panel structure is a new light structural system suited to housing industrialization,which has significant energy saving and excellent seismic behavior.In order to optimize multi-ribbed composite wall,an innovative multi-ribbed composite wall is put forward in this paper:precast shape steel oblique multi-ribbed composite wall.Compared with the traditional multi-ribbed composite wall,the improved wall possesses some advantages such as high lateral stiffness and bearing capacity,excellent seismic behavior and material saving.On the basis of experimental research and numerical simulation,seismic behavior and force mechanism of the new-type wall was studied in the paper.The main works and research results are as follows:(1)Low-cyclic reversed loading tests on four 1/2-scale multi-ribbed composite wall specimens were performed.Respectively,the multi-ribbed composite walls with different form of grids or different material in grids were contrastively analyzed on failure pattern,hysteretic characteristic,shear strength,stiffness degradation,deformation capacity and energy dissipation capacity.The experimental research results demonstrated that all the specimens had three seismic defense measures.Shape steel skeletons and oblique frame-grids both can substantially enhance the shear strength and lateral stiffmess of multi-ribbed composite wall.Especially the shear strength of shape steel oblique multi-ribbed composite wall can increase by 1.6 times and the ultimate interstory drift ratio of it reaches 1/50.The new-type wall also possesses excellent deformation capacity and energy dissipation capacity,while the hysteretic curve is very plump.(2)The finite element models of shape steel oblique multi-ribbed composite wall were established.And the contrastive analysis was performed on the failure characteristic,load-displacement curve and shear bearing capacity of walls under monotonic load between numerical simulation results and experimental results.The influence factors of shear strength of shape steel oblique multi-ribbed composite wall were studied through finite element simulation.The consequences showed that the results of numerical simulation was similar to that of experiment.There are many factors influencing shear strength of shape steel oblique multi-ribbed composite wall and section steel ratio is the leading one among them.(3)The advantages of oblique grid on shear performance were verified from the force mechanism of walls.The shear mechanism of shape steel oblique multi-ribbed composite wall was researched.Based on analysis results of the influence factors of shear strength,a formula for evaluating the shear bearing capacity of oblique section of shape steel oblique multi-ribbed composite wall under eccentric compression was put forward,meanwhile,the application conditions of the formula were proposed too.By comparing calculation of the shear bearing capacity formula with the value of test,it is receivable that the formula is reasonable and has a good applicability.The research in this paper can provide some experimental and theoretical basis for the further optimal design and extensive application of precast multi-ribbed composite panel system. |
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