Numerical Simulation And Parameter Analysis Of Dry Connected Joint Of Assemble Concrete Shear Wall

With the rapid development of urbanization in our country,society has put forth new demands on urban building systems such as economic efficiency and green energy saving.In the process of construction and long-term use of traditional urban building systems,the degree of industrialized in design and production is not common,and the consumption of energy is huge.The urban construction in the traditional construction technology and extensive mode of production,has a long construction period,a high quality defect rate,a low recycling rate,large environmental pollution and other problems,and it has been unable to meet the request of quality and function of the building with the city development.In order to realize the transformation from extensive urban construction to intensive urban construction,from high energy consumption to high performance and friendly environment,it is imperative to develop an industrialized urban system that can realize the standardization of design,industrialization of production,construction mechanization,and scientific management.The current implementation of the building structural system is assembled structure in China,by the means of industrial technology,such as factory prefabricated and site installation,it avoids a lot of waste of resources energy and environmental pollution,but also saves a lot of labors,it shows the industrialization advantages and improves the quality of the building.As we all know,most of the assembled structures are wet connection,and the assembled rate is low in practical projects.In order to improve the assembled rate,simplify the construction process,shorten the construction period and reduce the cost,a fully assembled shear wall dry connection method is proposed.It is relying on the bolt steel bar as the connecting link,through the dry construction method,making the shear wall panels fast and reliable connection.In this paper,the finite element analysis of the connected joints of the assembled concrete shear wall connected with bolts are carried out,the stress characteristics of the connected joints are clarified and the design suggestions are given through the analysis of the parameters of the system.The main contents of this article are as follows:(1)ABAQUS was used to build the node of assembled shear wall model and the cast-in-site concrete shear wall respectively.The assembled shear wall under the dry node connection used bolting steel bar to anchor connecting steel plate,it is simplified as tie connection in the modeling process,and hard contact is set on the concrete interface at the node.Then,analyzing the difference between cast-in-site concrete shear wall nodes and assembled shear wall of the dry-type connecting node in hysteresis curve,skeleton curve,bearing capacity,stiffness degradation,ductility coefficient under the low cyclic reciprocating load,and understand the stress characteristics,stress distribution,elastic-plastic development process and failure characteristics of the dry connection node of the assembled shear wall.(2)Systematically comparing the stress performance of the assembled shear wall using the dry connection node and cast-in-place shear wall under low cyclic loading,adjusting the arrangement of bolt reinforcement in the assembled wall,analyzing the influence of bolt arrangement on the mechanical behavior of dry connection node of the assembled shear wall and giving the optimal arrangement of bolt reinforcement.(3)Numerical simulation of dry connection node of the assembled shear wall under different parameters is carried out,analyzing the influence of different aspect ratio,axial compression ratio,bolt rebar diameter,bolt rebar grade,connecting plate type of parameters on mechanical properties such as anti-seismic capacity,deformability and stiffness degradation of dry connection node of the assembled shear wall.(4)Summarizing the performance of the dry-type connecting nodes of the assembled shear wall,the advantages and disadvantages of the self-connected shear walls are analyzed based on the stress characteristics of other shear wall structures,and then the optimal design suggestions and improvement measures are given.