Study On Mechanical Properties Of New Flexible Connection Between Reinforced Concrete Frame And Assembled Wall

Filled wall frame structure can be flexibly matched with the characteristics of building plane layout,conducive to the arrangement of large space of the building structure and other characteristics.At the same time,beam and column components are easy to standardize,easy to use the assembly of integrated structure to realize the advantages of building industrialization,so it has been widely used.However,there are still many problems in practical application and a large amount of seismic damage data.First of all,in the design stage,the constraint effect of the packed wall on the frame structure is not considered,and the rigid connection mode is used between the packed wall and the frame,which leads to the complex interaction force between the packed wall and the frame.Secondly,due to the reasons of the clay brick itself,the tensile and shear properties are poor,and the characteristics of its own stiffness are large.In the process of the interaction between the wall and the frame,the frame will not only change the force distribution,but also crack and even collapse when it is squeezed.Aiming at the above problems,the following work is carried out in detail.According to the existing literature and specification requirements,a new type of flexible connection mode of filled wall frame structure is proposed,and the basic structure of the connection mode and the advantages of the connection mode applied to the assembly integral frame structure are introduced in detail to solve the disadvantages of the existing connection mode.To provide construction technical support for the development and application of prefabricated concrete block filled wall;Based on the ABAQUS finite element analysis platform,the finite element models of filled wall frames with different connection forms were established.In order to simulate the actual situation and stress of the structure reasonably,the boundary conditions of the wall and frame are simulated by using three-dimensional solid element.At the same time,the failure process of the new type of flexible connection filled wall frame specimen in plane was simulated.The rationality of this type of connection is verified from the failure characteristics,bearing capacity,ductility and stiffness of the structure.Taking the constraints between the filling wall and the frame as variables,the in-plane seismic performance of the new flexible connection mode under different wall-frame connection forms was analyzed,and the in-plane seismic performance of the wall under different constraints between the wall and frame was compared and analyzed.Based on the analysis of the influence factors of the in-plane failure mode on the seismic performance of the packed wall,the finite element model established in this paper is used to study the influence of different block sizes on the in-plane seismic performance of the wall under different constraints from different perspectives such as wall deformation,stress development process,wall bearing capacity and stiffness.Based on the above work content,the conclusion can be drawn as follows: the proposed new flexible connection mode of filled wall frame reduces the adverse effects of lateral restraint,reduces the damage degree of the wall,and makes the cracks of the wall develop evenly and reasonably.At the same time,the failure trend of plastic hinge is slowed down,and the force mode between the frame of filled wall is more reasonable.By comparing the mechanical properties of block walls with different height to width ratios under the same connection mode,it is concluded that the bearing capacity of the whole structure decreases gradually with the increase of the block size.At the same time,with the increase of the height-width ratio of the block dimensions,the lateral stiffness of the structure decreases.Considering comprehensively the change of bearing capacity of the whole structure caused by the failure forms of the wall and the influence of the lateral stiffness provided by the wall on the frame,it is suggested that the application range of the height-width ratio of the block in engineering application is 0.375-0.5.