Nonlinear Finite Element Analysis Of Unconflned High-strength Concrete Shear Wall

In the earthquake, the study found that the bottom of the shear wall shear span less thanthe average, from1.4~1.9, are in high-shear wall, a lot of tests show that in high-shear walloccurred by shear affect the main form of destruction, the destruction of the shear wallbearing capacity mainly borne by the shear wall webs reinforced the role of webs in thedistribution has also become an important research direction. However, due to the limitationsof the experimental conditions, the level distribution of the reinforcement and verticaldistribution of reinforcement in the web of cracks after the current study is still no unifiedunderstanding.Some studies suggest that the vertical distribution of steel to playa role inbending only, no effect on the oblique section, only cracks play a limited role in the horizontaldistribution of tendons in the destruction of the oblique section of shear wall bearing capacityand limit crack development have an important role; some studies suggest that the verticaldistribution of tendons play an important role in the destruction of the oblique section, thehorizontal distribution of tendons only serve to limit the crack development. Its object ofstudy more for the shear wall components of the edge constraint distribution reinforced therole is not fully reflected, and the impact on the distribution ofreinforcing bars. With the rapid development of high-rise building structure, the application ofhigh strength concrete is more extensive, high-strength concrete shear walls have alsoemerged, and high-strength concrete shear walls cracked, the cracks penetrate the coarseaggregate, so by the shear oblique fracture surface the bite on the aggregate would not achievethe loss of the role of shear, be borne by the concrete force all to crack at the reinforcement,high strength concrete shear wall webs horizontal and vertical distribution of tendons theeffect of the more important.This article on a study of confined high strength concrete shear wall components,components of high aspect ratio is1.33, in high-shear wall components, the main contents ofthe analysis of axial compression ratio, the horizontal distribution of the reinforcement ratio and vertical distribution of the reinforcement ratio three factors,respectively, on the unconstrained shear wall.Design three sets of components, eachcomponent size are the same, the only independent inspection of three factors on the three setsof components. Finite element data and analyzed these three groups of57components, mainlyto the following conclusions:(1)axial compression should be limited to the axial compression ratio than unconstrainedhigh-strength concrete shear wall components;(2) the horizontal distribution of the reinforcement ratio is not greater than1.0%, thebearing capacity of the horizontal direction and the horizontal direction of the componentdeformation increasing with the increase of the horizontal distribution of the tendons, whenthe ratio of reinforcement to increase bearing capacity,deformation unfavorable;(3) distribution of longitudinal reinforcement ratio of horizontal bearing capacity of the componentshave little effect, but the development impact of the crack, studies show that:0.2axial compression ratio,the vertical distribution of the reinforcement ratio of0.5%to0.8%between components comprehensiveperformance is better;0.4axial compression ratio, the vertical distribution of the reinforcement ratio ataround0.8%, the integrated component performance is better; reinforcement ratio increased again, have anadverse effect on the deformation.