Analysis of Seismic Properties of RC Shear Wall with SRC Specially-shaped Cross Columns Frame

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1. School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, PR China

2. Jiangsu Province Key Laboratory of Structure Engineering, Suzhou University of

Science and Technology, Suzhou 215011, PR China

Abstract: Aiming at the defects of reinforced concrete shear wall that the seismic behavior is insufficient, this paper sets SRC specially shaped columns at the edge of RC shear wall, and puts forward a new mixed structure. In order to verify the seismic properties of shear wall with SRC specially-shaped cross columns frame, this paper conducts pushover analysis and hysteretic analy-sis on the basis of shell element and fiber element in open system Opensees. The RC shear wall a dopts ShellMITC4 element, and the SC specially-shaped columns adopt dispBeam-Column element. They are connected by zerolength element. The model is on a scale of 1 : 2. 5. Pushovercurves, shears borne by columns and shear wall, hysteretic curves and equivalent damping ratio of specimens are obtained under different axial compression ratio. The study results show that the two component can form a whole, RC shear wall bears most shears, compared with RC shear wall. The ductility, maximum shear, and energy dissipation capacity of the mixed structure are improved in different degrees. With the axial compression ratio increase, the ratio of the improvement gradually decreases. The new structure can improve seismic behavior effectively under eart-hquake.
Keywords: special-shaped column; steel reinforced concrete; shear wall; seismic behavior; hysteresis hehavior

1 Introduction

Special-shaped column structure is the structure which column section is L-shaped, T-shaped or crisscross-shaped. In recent years, special-shaped column structure won the national attention and love of the owners because of its equal thickness of columns and wall, excellent architectural appearance and highroom rate. In 2006, Ministry of Construction of the Peoples Republic of China has issued 'Technical specification for concrete structures with specially shaped columns' (JGJ149-2006), which has been implemented since August 1,2006 [1,2]. Accordingly, there have been a lot of research on ordinary reinforced concret (RC) frame structure with special-shaped column, and this kind of the structure has received quite extensive application because of its great architectural functions. But in practice, there are many weaknesses for this structure such as limited loading capacity, low limit value of axial compression ratio, poor seismic performance and complex construction, which restricts its application. Steel reinforced concrete (SRC) special-shaped column structure isanew type of structural form, whose column is the combination of RC special-shaped column and the profile steel [3,4]. Xirsquo;an University of Architecture and Technology has conducted in-depth research, which show that the loadingcapacity of SRC special-shaped columns is high and the seismic performance is excellent [5,6,7]. However, as the addition of thesteel, resulting in an inevitable increase of the difficulty in construction. Concrete- filled steel tube structure with special-shaped column is another new type of structural form, andits construction is convenient. Based on the pseudo-static test of 7 L-shaped concrete-filled steel tube columns, Tongji University shows us that L-shaped concrete-filled steel tube column has good ductility and energy dissipation capacity under low cycle reciprocating load[8].

From above, the theory of RC structure with special-shaped column has bee-n quite mature. But researches on the other two types of structures are mainlyabout the basic mechanical behavior and seismic performance of special-shapedcolumn and beam-column joint, and even there is no research on concrete-filled steel tube structure with special-shaped column. In this paper, we make the comparative analysis of seismic performance on three different forms of special-shaped column frame structure. The analysis not only provides the numericalsimulations for the upcoming hybrid test, but also play a role in expending the application of special-shaped column structure.

2 Model design

In this paper, three different forms of special-shaped column frames are used as the research object for seismic performance. They are RC special-shaped column frame, SRC special-shaped column frame and concrete-filled steel tube special-shaped column frame. In order to be able to contain the bottom, middleand top of all forms of beam-column joints, the two cross three layersmiddleframework model is chosen in special-shaped column frame, its side column is T-shaped column, and its interior column is cross section column. The height of framework underlying is 1.6 m, the high of the second and thethird layer is 1.2 m. The scale ratio is 1:2.5.The cross-sectional area of three types of frame column is equal, the depth-thickness ratio of the limb are all 3,the depth of limb is 300 mm, the thickness of the limb is 100 mm. Beam section adopts RC beam, and the beam breadth takes 100 mm, which isequalt-o limb thickness of special-shaped columns, the height of beam takes280 mm.The threemainly differ in the form of column section steel , their geometry size and section steel form as shown in figure 1 (unit: mm).

On the selection of materials, the concrete uses C35,and its axial compressivestrength standard value is 23.4 MPa, axis tensile strength standard value is 2.20 MPa; Steel uses HRB335, the diameter of column longitudinal reinforcemenis8 mm, that of stirrup is 6 mm,t-he scope of the column end 400 mm and theshear are encrypted,encryption district 40 mm spacing, unencrypted distance is 80 mm; the diameter of frame beam main reinforcement is 12 mm, that

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