| As a new type of anti-lateral force component,anti-buckling steel plate shear wall has a good seismic performance.Compared with steel plate shear wall,anti-buckling steel plate shear wall can effectively improve such defects as large buckling deformation,poor fire performance and sound insulation,and has hysteresis performance and higher shear capacity.The new shear wall is mainly composed of steel frame,embedded steel plate and precast concrete cover plate.Among them,there are cracks between the concrete cover plate and the steel frame,which do not directly participate in the resistance to the horizontal and vertical loads on the structure,but control the out-of-surface buckling amplitude of the steel plate by providing out-of-surface restraint stiffness,thus avoiding low-order buckling deformation of the steel plate and giving full play to the material properties of the steel plate.Therefore,the concrete cover plate is not the main stressed member.Therefore,the application of recycled aggregate processed from building waste concrete to the anti-buckling steel plate shear wall instead of the concrete made from natural aggregate can not only provide out-of-surface restraint stiffness for the embedded steel plate,but also effectively utilize the construction waste,so as to achieve the goal of green,environmental protection and sustainable development.On the other hand,the embedded steel plate and the steel frame of the traditional flexure resistant steel plate shear wall are welded through the fishtail plate.In order to effectively improve the assembly production efficiency and reduce the workload of site construction,welding connection between the embedded steel plate and the steel frame must be avoided correspondingly.Therefore,this paper proposes a new type of prefabricated components-the precast recycled concrete anti-buckling steel plate shear wall.That is,the precast concrete cover plate is made of recycled aggregate cast,and is connected with the embedded steel plate by bolts,while the embedded steel plate is connected with the steel frame by equal-side angle steel and four-side bolts.And then,the seismic performance of the new assembled shear wall is discussed by means of experimental research,theoretical analysis and numerical simulation.The main research contents and conclusions of this experiment are as follows:(1)An experimental study on the quasi-static force of prefabricated recycled concrete anti-buckling steel plate shear wall is carried out.And two sets of 7 1:3 scale precast recycled concrete anti-buckling steel plate shear wall and a pure steel frame were designed and made.The two groups of test variables were bolt spacing of recycled concrete cover plate and different replacement rate of recycled aggregate.The results show that the precast recycled concrete shear wall with anti-buckling steel plate has good hysteresis performance and high shear capacity.Different replacement rates of recycled aggregate have little effect on the seismic performance on the lateral force resistant component.The application of construction waste to buckling-restrained steel plate shear wall is a promising regenerative technology.Reducing the bolt spacing of the recycled concrete cover plate can effectively improve the shear capacity of the members.When the bolt spacing is less than a certain range(400mm in the scale experiment),the continuous reduction of the bolt spacing hardly affects the seismic performance of the members.(2)The seismic performance of the new shear wall was numerically simulated and analyzed by establishing an accurate finite element model.The main structural parameters studied are the ratio of the height to thickness of embedded steel plate,the ratio of length to height,the thickness of recycled concrete cover plate,the bolt spacing,the initial defects and the replacement rate of the recycled aggregate.The numerical simulation results show that the seismic performance of the structure can be improved by increasing the ratio of length to height and decreasing the ratio of height to thickness.When the thickness of the recycled concrete cover plate is more than 50 mm,it can effectively inhibit the out-of-plane low-order buckling deformation of the embedded steel plate and improve the shear capacity and hysteretic performance of the members.In addition,as an important part of the out-of-plane constraint stiffness provided by the recycled concrete cover plate,the bolt spacing should be controlled within a reasonable range(700mm).The initial defects affect the buckling mode of the embedded steel plate.In order to avoid the occurrence of low-order buckling deformation,the initial defects between the embedded steel plate and the recycled concrete cover plate should be strictly controlled within 7mm(h/450).When the cover plate meets the minimum thickness(50mm)requirement,under the same strength grade,using recycled concrete cover plates with different replacement rates of recycled aggregate will not reduce the seismic performance of members.(3)Based on the principle of high order buckling deformation,a calculation formula for shear capacity of prefabricated recycled concrete anti-buckling steel plate shear wall is put forward.The results show that AISC341 is not applicable to buckling-restrained steel plate shear wall using recycled concrete,and the relative error of bearing capacity predicted by JGJ/T 380 formula is large.The calculation results of the shear capacity model presented in this paper are in good agreement with the test results and numerical results,and have high accuracy and reliability,which can be used as a reference for engineers to calculate the shear capacity of prefabricated recycled concrete anti-buckling steel plate shear wall. |
PDF Full Text Request