Seismic Behavior Of Fabricated Concrete Shear Wall With Different Vertical Steel Bar Connection Modes

The ministry requested the proportion of prefabricated structures in new buildings should be accounted for more than 50% up to 2025. Construction industrialization is the increasing trend of construction industry, and prefabricated shear wall structure is in accordance with housing demand due to its flexible layout. As a result, it has a promising application in this area. Chongqing, as the low-intensity in area, also needs to build a system of prefabricated structures. In the study of prefabricated shear wall, the vertical reinforcing steel bar connection plays an important role in the field of connecting the wall pieces, which work together with vertical reinforcing steel bar. Therefore, the effects of vertical reinforcing steel bar connection on the seismic capabilities of prefabricated shear wall structures should be researched. In this paper, the vertical reinforcing steel bar connection modes are studied and the effects of different vertical reinforcing steel bar connection modes on the seismic capabilities of prefabricated shear wall are investigated, which is regarded as expansion of previous research results and is provided as the basis of further researches. Moreover, it is necessary for the present studies to develop the data collection of the relevant technical standards in Chongqing.In this paper, based on the topic of existing researches, experimental and numerical studies of lab joint anchor, socket connection, sleeve lab joint and lapped bundled bar connection are performed as follows: 1) The prefabricated shear wall specimens with lab joint anchor, socket connection, sleeve lab joint and lapped bundled bar connection are designed and produced in the laboratory. In addition, the pseudo static tests with different prefabricated shear wall specimens are conducted. 2) The failure processes and testing data of specimens with different connection modes are analyzed from the fields of skeleton curves, bearing capacity, ductility, stiffness degradation, energy dissipation and so on. 3) There are 8 kinds of numerical models are conducted to study the effects of different kinds of lapped bundled bar connection modes in the region of the edge artifacts and wall body distribution with different longitudinal reinforcement area. 4) Numerical analysis of longitudinal reinforcement connection mode is also conducted.The main conclusions for the whole paper are summarized as follows,(1) Although there are some differences in the aspect of seismic capability when various steel bar connection modes of prefabricated shear wall specimens, such as lab joint anchor, socket connection, sleeve lab joint and lapped bundled bar connection, are taken as connection modes, all the connection modes can achieve the desired results, which are in good agreement with cast in place shear wall specimens. All the vertical reinforcement connections can be applied to prefabricated wall.(2) Relatively, semi-socket connection which combines the strong points of mechanical connection and pulp anchor connection, which is solid, time-saving and easy for construction. What's more, it has favorable mechanical property and superior economical efficiency. Therefore, semi-socket connection can be an optimal way of connection.(3) Horizontal tendon connection can reduce the number of steel. Although its mechanical property is a bit different from that of socket connection, it has better mechanical property and economical efficiency. Horizontal tendon connection can be better applied in areas where have a relatively lower requirement on prefabricated wall. It is a more optimized way of connection and worth further study and promotion.