Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

Vibration Monitoring of Flat Plate Slab

1.0 Scope of Work :

Vibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation.

2.0 General Info:

a) Testing Agency:

Prosoil Foundation Consultan

b) Client :

CTRS (Civil), KUET, Khulna-9203

c) Person Carrying Out Measurement:

Md. Mehedi HasanB.Sc. Engg. (Civil, BUET) and Tamanna Yasmin, B.Sc. Engg. (Civil, BUET).

d) Time and Date of Measurement: 20/07/2014

3.0 Type of Vibration:

a) Source: Machinery (Speed, load, etc)b) Operating Conditions: Impact

4.0 Structure:

a) Designation: Four-storied Factory Building at Dhaka EPZb) Classification: RCC Structurec) Description: RCC Building With Flat-Plate System

5.0 Site and Location: Each Measurement was taken beside the machine Foundation.

6.0 Measuring Chain:

a) Pick-ups: Vertical Velocity, Vertical Acceleration, Vertical Frequency and Vertical Displacement

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

7.0 Results of Measurement:

Chart and GraphLocation 1: Polar Cutting Machine 1

Figure 6.1(a): Velocity vs. Time

Figure 6.1(b): Velocity vs. Frequency Curve

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

Figure 6.1 (c): Displacement vs. Time

Location 2: Polar Cutting Machine 2

Figure 6.2(a): Velocity vs. Time

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

Figure 6.2(b): Velocity vs. Frequency

Figure 6.2(c): Displacement vs. Time

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

Location 3: Kama Pro

Figure 6.3(a): Velocity vs. Time

Figure 6.3(b): Velocity vs. Frequency

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

Figure 6.3(c): Displacement vs. Time

Location 4: Cylinder Dye Cutting Machine 1and 2

Figure 6.4(a): Velocity vs. Time

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

Figure 6.4(b): Velocity vs. Frequency

Figure 6.4(c): Displacement vs. Time

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

8.0 Conclution:

From the measurement the Pickups Are:

Pickups

Location

Velocitymm/s

(Maximum)

Frequency(Hz)

(With Respect to Maximum Velocity)

Displacement(mm)

(With Respect to Maximum Velocity)

DIN Zone

1 11.448 30.5 0.0754 Between I & II

2 4.573 1.5 0.2693 Between II & III

3 2.772 48.5 0.0146 Below III

4 4.712 10.5 0.0821 Between II & III

(Engr. Tamanna Yasmin)B. Sc. Engg (Civil, BUET), M.Sc. Engg. (Buet, Student),Geotechnical EngineerPROSOIL FOUNDATION CONSULTANT

(Engr. Mehedi Hasan)B. Sc. Engg (Civil, BUET)Geotechnical EngineerPROSOIL FOUNDATION CONSULTANT

(Engr. Md. Shamsul Islam)B. Sc. Engg (Civil, BUET), M. Engg. (Geotech), MCSD, MIEB, CCPE, BSGE, ISSMFE Managing Director PROSOIL FOUNDATION CONSULTANT

Engr. Md. Shamsul IslamB. Sc. Engg. (Civil), M. Engg. (Geotech)FIEB-8578Chief ExecutiveProsoil Foundation Consultant

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

Appendix

A1. Specification of Velocity Pick Up on Ground:

Sl. Nomenclature/Description Technical Specification

1.

Maximum [v], Maximum [a] and

frequency

In x, y, z-director per time interval

PPV (peak particle velocity) with dominant frequency, PPA (peak particle acceleration)

Continuous measurements of [v], f and [a] in x, y, z direction.

VIBRA+ model also [u] and KB-values according to DIN4150-2

2. Velocity range 0 – 100 mm/s

3. Resolution display 0.01 mm/s

4. Resolution AD-converter 0.001 mm/s (24 bits ADC)

5. Geophone correction Digital IR filter

6. Frequency range and

accuracy

DIN 45669-1 June 1995, accuracy cass 1

Or (SBR-part A, B 2002)

7. Graphical display > Lines; display backlight;anti-reflex coating; anti-scratch

8. Sensor type 3-Channel geophone (x-,y-,z-direction)

9. Storage capacity Minimum 1 GB.

10. Storage interval 1, 2, 5, 10, 20, 30, 60 s; 1, 2, 5, 10, 15 min.

11. Data save level Adjustable between 0.01 – 100.00 mm/s (or always)

12. Alarm level Adjustable between 0.01-100.00 mm/s (or none)

13. Clock stability Approx. 5 minutes/year at 25°C

14. Temperature range

(Operating)

- 20°C to + 60°C

15. Protection rating IP 65 according to DIN 40

050/IEC 529.

16. Casing Aluminum casing

17. Batteries 3 x 1.5 V Alkaline D-size batteries/

Recharged

18. Battery life 28 days (continuous operartion)

19. Data retention 10 Years (minimum) at 250 C.

20. PC Software program Windows 2000/XP

21. Communication port US B data transfer.

22. Size 216 x 160 x 50 mm

23. Weight 2 Kg

a. Cable 50 m Cable reel according to DIN45669

b. Security cable Kensington security cable

c. Alarm Wireless alarm beacon

d. USB External power vía USB adaptar.

e. Power Mains (230V) or 3 x 1.5 V Alkaline D-size batteries

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

A2. DIN (4150-3 : 1999-02) Guideline:

Table 1: Guideline values for vibration velocity to be used when evaluating the effects of short-term vibration on structures

Table 2: Guideline values for vibration velocity to be used when evaluating the effects of long-term vibration on structures

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Vibration Monitoring of Flat Plate SlabVibration monitoring of flat plate slab at 1st floor level of Avery Dennison Corporation, Savar EPZ, Dhaka, Bangladesh.

Figure 1: Curves for guideline values specified in table 1 for velocities measured at the foundation.

A3: Effect on Floor:

Short Term:

Where short-term vibration causes floors to vibrate, if v is no greater than 20 mm/s when measured at the point of maximum velocity (which ¡s usually at the center of the floor), a reduction in the serviceability of the floor is not to be expected. In the case of buildings as in line 3 of table 1, it may be necessary to lower this value to prevent minor damage.

Long Term:

Experience has shown that vertical vibration velocities up to 10 mm/s do not cause damage in floors of structures as in lines 1 and 2 of table 3, even if the maximum design stresses are fully utilized. Such vibration is very clearly perceptible. For structures as in line 3 of table 3, no guideline value can be given for vertical vibration.

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