**3.4 Test setup**

With the help of servo hydraulic actuator, in-plane lateral load was supplied to the specimen at the end of the top beam along its centroidal axis. The opposite side was supported by a strong steel reaction frame two channel section were placed symmetrically on both side of the beam and fitted tightly using strong bolts at regular intervals. The lateral load supplied to the beam using the channel section. In order to avoid the distraction particularly horizontal & vertical movements during

**11**

**Figure 6.**

*Typical sketch of RC frame specimen detailing.*

**Figure 5.**

*Effects of Creep on RC Frame Subjected to Cyclic Load with Magnetorheological Damper*

lateral loading, the footing was fixed firmly in the strong floor. The lateral support was given by the steel sections to avoid it's out of plane movements. The test setup

*DOI: http://dx.doi.org/10.5772/intechopen.81971*

*(a) Schematic MR damper; (b) fabricated MR damper; (c) shear mode.*

was given in **Figure 8**.

**Figure 4.** *Preparation of MR fluid.*

*Effects of Creep on RC Frame Subjected to Cyclic Load with Magnetorheological Damper DOI: http://dx.doi.org/10.5772/intechopen.81971*

lateral loading, the footing was fixed firmly in the strong floor. The lateral support was given by the steel sections to avoid it's out of plane movements. The test setup was given in **Figure 8**.

#### **Figure 5.**

*Creep Characteristics of Engineering Materials*

The nano sized iron particles (Fe3O4) of size 10–12 nm were used as a smart material and silicone oil as the carrier oil. The MR fluid was prepared by mixing 80% of weight of silicone oil and with 20% Fe3O4 particles. The addition of Fe3O4 was slow and uniform under stirring condition for about 30 minutes. Then, the above mixture is sonicated about 1 hour under the frequency of 0.5 Hz. During sonication, the major proportion dispersed with the silicon oil. Therefore, there discourages the

c is 0.822 Pa-s.

gravity settling. The off-state viscosity of the MR fluid prepared at 270

coil was wound around the piston with 260 no. of turns.

**Figure 4** depicts the schematic representation for the preparation of MR fluid.

For the present study, the shear mode MR damper was modeled. **Figure 5a** shows the design and configuration of the MR damper adopted. The fabricated MR damper using mild steel was shown MR damper was fabricated using mild steel shown in **Figure 5b**. Since the proposed MR damper was shear mode, the copper

explained. In the shear mode MR damper, a thin layer of MR fluid is sheared between the piston and the cylinder, that space is specifically called as annular gap.

are given in **Figure 6**. The frame was casted according to the details given in **Figure 7**. The damper was scaled to resist forces in a single bay RC frame. The damper was positioned diagonally on the frame. The grade of concrete used for the specimen is M25, The reinforcement details of beam, column and stirrups of

In order to produce large force, shear mode MR damper is needed.

8,8,3 mm. The support condition is fixed for the specimen.

From **Figure 5c**, the reasons behind the MR damper under shear mode is clearly

The dimensions and the detailing of RCC frame adopted for the present work

With the help of servo hydraulic actuator, in-plane lateral load was supplied to the specimen at the end of the top beam along its centroidal axis. The opposite side was supported by a strong steel reaction frame two channel section were placed symmetrically on both side of the beam and fitted tightly using strong bolts at regular intervals. The lateral load supplied to the beam using the channel section. In order to avoid the distraction particularly horizontal & vertical movements during

**3. Experimental studies**

**3.1 Preparation of MR fluids**

**3.2 Modeling of MR damper**

**3.3 Cyclic load test**

**3.4 Test setup**

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**Figure 4.**

*Preparation of MR fluid.*

*(a) Schematic MR damper; (b) fabricated MR damper; (c) shear mode.*

**Figure 6.** *Typical sketch of RC frame specimen detailing.*

**Figure 7.** *Casted RC framed specimen.*

**Figure 8.** *Sketch of test setup.*
