Study On Connection Structure Of Precast Damping Wall-RC Frame Structure

The research team proposed the idea of using the damping wall instead of the traditional frame-filled wall to reduce or avoid the damage of the infill wall and its adverse effect on the seismic performance of the precast damping wall-concrete frame structure.Researches show that the damping mechanism of the damping wall is clear,which can significantly improve the seismic performance of the precast frame structure and has broad development prospects.There are corresponding deficiencies in the mechanical properties of the joints and the practicality of the construction in the four types of connection construction schemes of the precast damping wall-concrete frame structure adopted in the previous experimental research.It is important to study the joint construction measures that combine the superiority of performance and the ease of assembly for the research and application prospects of the fabricated damper-concrete frame structure.The main work and conclusions of this paper are as follows:(1)Summarizing the problems existing in the connection structure scheme adopted in the previous research of the research group,regarding the position and size of the gap of the damped wall panel frame,the mechanical properties of the rigid joint form of the damped wall panel frame,the rationality of the connection structure of the fabricated damped wall-concrete frame structure is discussed by means of finite element simulation and theoretical analysis.The results show that: 1.A certain gap should be reserved between the top damping wall element and the frame top beam;If the rigid connection of the damping wall panel element is located on the frame column,then a gap between the rigid end of the damping wall panel element and the frame column should be reserved,the width of which is equal to the reserved gap of the flexible end(the large earthquake displacement value of 1 ? 50 frame in the corresponding code is adopted);2.If the rigid connection of the damping wallboard element is located on the frame column,the design of the connector between the rigid end of the damping wall element and the frame column should ensure that only one horizontal displacement can be produced synchronously between the frame column and the wallboard element when the frame column is laterally deformed.The damping wall material should adopt the solid section,and within the allowable size range,the contact area between the connector and the wall material should be increased as much as possible.On this basis,three new types of construction schemes of precast damping wall-concrete frame structure connection are put forward.(2)In order to investigate and compare the mechanical properties of the new type of assembled damping wallboard-concrete frame structure proposed in this paper,five precast concrete frame specimens are designed for quasi-static test of in-plane mechanical properties.Studies show that: 1.Three new connection construction schemes of precast damping wallconcrete frame connection show superior performance,give full play to the advantages of sliding energy dissipation mechanism of damping wall,and can obviously improve the seismic performance of frame members.The damping wall and its connectors remain intact and successfully avoid the local damage of the damping wall and the instability of the connectors in the previous tests of the research group;2.The additional stiffness effect and constraint effect of the damping wall on the frame are much weaker than those of the conventional wall,which is beneficial to prolong the period of the frame structure and reduce the response of the structure under earthquake;3.On the one hand,the damping wall can improve the bearing capacity of the structure to a certain extent,but compared with the conventional wall,because of the weak effect of the damping wall on the lateral support of the precast frame structure;On the other hand,The additional lateral bearing capacity of the damping wall for the frame is relatively stable;4.Damping wall can well alleviate or avoid two problems: First,when the infill wall is arranged vertically and unevenly,the floor of the precast frame structure will have a sudden change in stiffness;Second,when the infill wall is asymmetrically arranged,the precast frame structure will have a torsional effect.