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### 5 swapnil

1. 1. First seminar on Department of Applied Mechanics VISVESVARAYA NATIONAL INSTITUTE OF TECHNOLOGY Submitted by SWAPNIL .K. DANI Guide Dr. G. N. RONGHE  DEVELOPENT OF EXPERIMENTAL SETUP FOR DYNAMIC STRAIN MEASUREMENT
2. 2.  Introduction  Literature review  Aim of present study  References Contents
3. 3. TYPES OF STRAIN  LINEAR STRAIN Ratio of change in length due to deformation to original length.  LATERAL STRAIN Ratio of change in length of the body due to deformation to its original length in directional perpendicular to force.  VOLUMETRIC STRAIN Ratio of the change in the volume of the body to the deformation to its original volume.  SHEAR STRAIN It is the strain accompanying a shearing action
4. 4. METHODS FOR STRAIN MEASUREMENT Static strain measurement Dynamic strain measurement Figure 1 Source: http://www.kyowa-ei.co.jp Figure 2 Source: http://www.kyowa-ei.co.jp
5. 5. DIFFERENT METHODS FOR STRAIN MEASUREMENTS 1) Grid method, brittle coating. 2) Electrical-resistance strain gauges. 3) Calibration of strain gauges. 4) Bridge circuit for strain gauges.
6. 6. INSTRUMENTS USED Strain gauge Vibrating wire strain gauge(VWSG) Electrical strain gauge(ESG) Optical fiber Bragg grating(FBG) Extensometer Tape extensometer Borehole extensometer Accelerometer Pressure Transducers Temperature sensors
7. 7. 1. Small & lightweight 2. Digital value , bar graph , storage data etc.are displayed 3. Sampling wave recording 4. Built in bridge box LAB INSTRUMENT FOR DYNAMIC STRAIN MEASUREMENT Figure 3 Source: http://www.tml.jp DYNAMIC STRAIN METER
8. 8. 1. Compact & lightweight 2. Large capacity data memory 3. Data visualization and data transfer 4. Easy to grip and portable Figure 4 Source: http://www.tml.jp DIGITAL STRAIN METER
9. 9. LITERATURE REVIEW Cook and Ventura (1999) described the dynamic strain testing of the Lindquist bridge. The dynamic characteristics of the bridge were investigated by using six strain gauges , one displacement sensor , and one temperature gauge. Hou and Lynch (2006) here the use of low-cost and easy-to-install wireless sensors to record bridge responses during short-term load testing is studied. A combination of strain gages , accelerometers and transducers are used . First the acceleration response of the bridge is monitored by the wireless system during routine traffic loading , also modal parameters are calculated by the wireless sensors .
10. 10. Casadei et al.(2008) paper highlights the emerging alternatives for health monitoring by using fiber optic sensing technology . Strain profiles along the steel girders of a continuous slab-on-girder bridge are obtained by using optical fiber sensors. Rutz et al.(2008) in this paper took into account the effect of wind pressure to determine the structural adequacy of the structures . Strain transducers have been used extensively tested in laboratory to verify reliability . Stepanova et al.(2013) considered design principles for three high- performance microprocessor multi-channel strain-gauge system used in dynamic test of different structures. Strain gauges power supply is activated for short periods to measure the deformations of a structure. LITERATURE REVIEW
11. 11. AIM OF PRESENT STUDY  Study of various static strain measuring instruments used on Structures  To find out limitation of static strain instruments over dynamic strain measuring instruments.  To study the behaviour of the strain gauges attached to the surface of Structure.  Development of structural models in laboratory for static and dynamic strain measurement.  Determining bending moments, deflection profiles using relevant software's.  Comparing experimental and analytical results.
12. 12. REFERENCES 1) Cook, S.E., and Ventura, C.E. (1999). “Dynamic strain measurements of the Lindquist bridge.” 17th International Modal Analysis Conference , Vancouver, B.C., Canada SPIE proceedings series A. 1999, vol. 3727, 2, pp. 903-907. 2) Dalley, J.W., and Rilley, W. F. (1991). Experimental Stress Analysis, McGraw Hill International editions, USA . 3) Herrero, T. V., Rutz, F. R., Rens, K.L. (2008). “ Wind Pressure and Strain Measurements on Bridges. II: Strain Transducer Development ”, Journal of performance of constructed facilities A. 2008, vol. 22, No.1, pp. 12-23. 4) Hou, T.C., and Lynch, J.P. (2006). “Rapid-to-deploy wireless monitoring systems for static and dynamic load testing of bridges :Validation on the grove street bridge.” Proc.,13th Annual International Symposium on Smart Structures and Materials. San Diego, pp. 61780D.1-61780D.12.
13. 13. 5) Kamrujjaman Serker, N.H.M., and Wu, Z.S. (2010). “ Structural health monitoring using static and dynamic strain data from long-gage distributed FBG sensor.” IABSE-JSCE Joint conference on Advances in Bridge Engineering-II. (August 8-10), Dhaka, Bangladesh. 6) Matta,F.,Bastianini, F., Galati,N., Casadei,P., and Nanni,A.(2008). “Distributed Strain Measurement in Steel Bridge with Fiber Optic Sensors: Validation through Diagnostic Load Test.” Journal of performance of constructed facilities, ASCE ,Vol. 22, No. 4, pp.264-273. 7) Singh, S. (2012). Experimental Stress Analysis, Khanna publishers, New Delhi, India. 8) Stepanova, L.N., Kabanov, S.I., Bekher, S.A., and Nikitenko, M.S. (2013). “Microprocessor Multi-channel Strain-gauge Systems for Dynamic Tests of Structures”, Journal of Automation and Remote control ,Vol 74,No.5, pp. 891-897.