13177-401-2 carlton building vibration monitoring · 2019. 2. 25. · john davies the carlton...

Microsoft Word - 13177-401-2 Carlton Building Vibration MonitoringTHE CARLTON BUILDING, 19 SCOTT ST NEWCASTLE EAST
Prepared for John Davies
Prepared by RCA Australia
February 2018
This document is and shall remain the property of RCA Australia. The document may only be used for the purpose for which it was commissioned and in accordance with the Terms of Engagement for the commission supplied at the time of proposal. Unauthorised use of this document in any form whatsoever is prohibited.
DOCUMENT STATUS
Name Signature Date
/2 Final N Pegler A Rees A Rees
6/2/18
/0 1 Electronic (email) John Davies ([email protected])
/0 1 Electronic RCA job archive
/1 1 Electronic (email) John Davies ([email protected])
/1 1 Electronic RCA job archive
/2 1 Electronic (email) John Davies ([email protected]) 6/2/18
/2 1 Electronic RCA job archive 6/2/18
RCA AUSTRALIA ABN 53 063 515 711 92 Hill Street, CARRINGTON NSW 2294
Telephone: +61 2 4902 9200 Facsimile: +61 2 4902 9299 Email: [email protected] Internet: www.rca.com.au
Contents 1. INTRODUCTION ........................................................................................................ 2
3.1 STRUCTURAL CRITERIA .................................................................................... 2 3.2 HUMAN VIBRATION EXPOSURE ......................................................................... 5
4. METHODOLOGY ....................................................................................................... 6
5. RESULTS ................................................................................................................... 7
6. CONCLUSION ......................................................................................................... 11
7 REFERENCES ......................................................................................................... 12
APPENDIX A
WEEKLY DATA
Page 2
John Davies The Carlton Building Vibration Monitoring 19 Scott Street, Newcastle East RCA ref 13177-401/2, February 2018
1. INTRODUCTION
RCA Acoustics has been engaged by John Davies to monitor vibration levels received at The Carlton Building (19 Scott St, Newcastle East), in order to document potential damage and disturbance from roadworks nearby on Scott and Zaara St associated with the Newcastle 500 motor racing.
This report provides the results of unattended vibration monitoring carried out in accordance with BS ISO 4866:2010, and compared to assessment criteria from DIN 4150 and BS 7385, over the period of 6 October to 27 November 2017
2. EQUIPMENT
The equipment used for logging vibration levels is described in Table 1 below.
Table 1 Equipment
Syscom MR3000C 1305 0162 August 2016
3. CALIBRATION LEVELS CRITERIA
3.1 STRUCTURAL CRITERIA
The standards DIN 4150[1] and BS 7385[2] set out criteria for assessing the likelihood of structural cosmetic damage to buildings. As currently there are no Australian guidelines for
RCA ref: 13177-401/2 Carlton Building Vibration Monitoring
6 February 2018
Attention: John Davies
VIBRATION MONITORING RESULTS At The Carlton Building, 19 Scott St, Newcastle East 2300
6 Oct-27 Nov 2017The Carlton Building
Page 3
evaluation of vibration effects on structures, these are considered the best standards for assessing the vibration discussed in this report. These guidelines set limits on vibration (measured in peak particle velocity, or PPV) below which damage to structures is not likely to occur. They provide for increased levels of vibration (ie higher PPV) as the wave frequency increases, as structures will generally have an increased response close to their natural frequency (frequency at which resonance and amplification occurs) which will typically be in the low (1 to 10Hz) range.
DIN 4150-3:1999[1] provides assessment criteria for assessing the likelihood of structural or cosmetic damage to buildings affected by short-term vibration. The assessment criteria are reproduced in Table 2 and Figure 1.
Table 2 Guideline values of vibration velocity for evaluating the effects of short- term vibration, DIN4150-3:1999
Line
Foundation Frequency (Hz)
<10 10 - 50 50 - 100 Frequency Mixture
1 Buildings used for commercial purposes, industrial buildings and buildings of similar design
2 0 20 - 40 40 - 50 40
2 Dwellings and buildings of similar design and/or use
5 5 - 15 15 - 20 15
3
Structures that, because of their sensitivity to vibration, do not correspond to those listed in lines 1 and 2 and are of great intrinsic value (eg buildings that are under a preservation order)
3 3 - 8 8 - 10 8
Page 4
Figure 1 Guidelines for Evaluating the Effects of Short Term Vibration on Structures
In addition, BS 7385: Part 2: 1993[2] gives guidance on the levels of vibration above which structures could be damaged. In this standard, damage is classified as cosmetic (formation of hairline cracks), minor (formation of large cracks) or major (damage to structural elements). Guide values given in the standard are associated with the threshold of cosmetic damage only, usually in wall and/or ceiling lining materials. The assessment criteria are reproduced in Table 3 and Figure 2.
Table 3 Transient Vibration Guide Values for Cosmetic Damage (from BS 7385: Part 2:1993)
Line
(see Figure 2)
Type of Building Peak Component Particle Velocity in Frequency Range of Predominant Pulse
4 Hz to 15 Hz 15 Hz and above
1 Reinforced or framed structures. Industrial and
heavy commercial buildings
2 Unreinforced or light framed structures. Residential or light
commercial type buildings
at 15 Hz
at 40 Hz and above
Note 1. Values referred to are at the base of the building.
Note 2. For line 2, at frequencies below 4 Hz, a maximum displacement of 0.6mm (zero to peak) should not be exceeded
0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100
V ib ra ti o n V e lo ci ty P P V i ( m m /s )
Vibration Frequency (Hz)
Guidelines for Evaluating the Effects of Short Term Vibration on Structures (after DIN 4150 Figure 1)
Line 1 Vibration velocity limit line for Commercial/Industrial Sturctures
Line 2 Vibration velocity limit line for Residential Structures
Line 3 Vibration velocity limit line for Sensitive Structures
Page 5
Line 1 Cosmetic Damage (5% Risk) BS 7385 Industrial
Line 2 Cosmetic Damage (5% Risk) BS 7385 Residential
Figure 2 Graph of Transient Vibration Guide Values for Cosmetic Damage
3.2 HUMAN VIBRATION EXPOSURE
The human body is sensitive to vibration at higher frequencies (above 10Hz), and human comfort is often the limiting factor in determining the acceptable level of vibration from construction activities. The NSW DECCW published recommended human comfort limits for vibration exposure in its document Assessing Vibration - A Technical Guideline[4]. The guide is based on BS 6472 and recommends appropriate criteria for human exposure to environmental vibration. Table 4 is a reproduction of Table C1.1 from the guideline and shows the preferred and maximum Peak Particle Velocity (PPV) and RMS acceleration values for continuous vibration.
Page 6
Table 4 Permissible Vibration Values for Continuous Vibration
BS 5228.2, 2009[3] provides guidance on the response of humans to vibration levels, which is reproduced in Table 5 below.
Table 5 Guidance on effects of vibration levels (from British Standard BS 5228- 2:2009, Annex B)
Vibration level
Effect
0.14 mm/s Vibration might be just perceptible in the most sensitive situation for most vibration frequencies associated with construction. At lower frequencies, people are less sensitive to vibration.
0.3 mm/s Vibration might be just perceptible in residential environments.
1.0 mm/s It is likely that vibration of this level in residential environments will cause complaint, but can be tolerated if prior warning and explanation has been given to residents.
10 mm/s Vibration is likely to be intolerable for any more than a very brief exposure to this level.
4. METHODOLOGY
The locations of vibration monitoring with respect to vibration works conducted over the survey period are shown below in Figure 3.
Page 7
The triaxial geophone of the Syscom MR3000C vibration monitor was firmly coupled to the floor inside the building by ensuring the geophone was level and weighting it down with a sandbag. The monitor continuously sampled vibration levels in three axes at a sample rate of 1000 Hz. Each minute, it recorded the peak velocity value measured in each axis for that minute.
The monitor was mounted inside the building, as work was occurring on the road and footpath immediately outside. The floor covering was floating tile.
Figure 3 Monitoring and Working Locations
5. RESULTS
Monitoring results over the survey period are presented in Appendix A. Values reported in Table 6 are the maximum Peak Particle Velocity (PPV) values from each axis recorded over each week (12PM Monday-Monday). Some high PPV samples were omitted from the graphs and table, due to inspection of the recorded wave file indicating the sample was likely due to foot traffic inside the foyer area. The Carlton Building has a local heritage listing and is
Vibration monitor – Location-1
Operation site
Page 8
understood to have been built over 100 years ago. For this reason, the recorded vibration data has been assessed against the criterion shown as line 3 from the DIN 4150 (buildings that are under a preservation order).
Page 9
Table 6 Maximum recorded PPV values in all directions
Measurement period
Maximum PPV
values (mm/s)
RCA’s Notes Client’s Notes
-
9-16 October 7.2 Vector sum peak occurred 5:12 pm 9/10/17. Multiple other high readings around this time, all with frequencies 40- 50 Hz, with continual vibration characteristic of a vibratory roller.
9/10/17: Resurfacing (milling and vibratory
roller) with roller adjacent to Carlton building around
4:30 pm
16-23 October
7.2 Vector sum peak occurred 7:43 am 22/10/17 (45 Hz, several short bursts of vibration). No other high readings at this time. Multiple high readings (4-5 mm/s) around 4pm 16/10/17, with frequencies 40-50 Hz (most likely vibratory rollers)
16/10/17: Resurfacing (vibratory rollers)
23-30 October
5.7 Vector sum peak occurred 8:09 pm 29/10/17 (49 Hz, intermittent short bursts). Other readings during this week are much lower.
26/10/17: Start of crash barrier installation
30 October- 19.1
Page 10
6 November Vector sum peak occurred 2:24 pm 2/11/17 (32 Hz, short bursts of vibration). Another high reading at 11:11 3/11/17 (47 Hz, single burst)
Monitor believed to have been disturbed by furniture removalist
6-13 November
-
13-20 November
-
(excluding race days 24- 26 Nov)
-
Race days (24th – 26th November)
-
Page 11
6. CONCLUSION
The vibration levels measured during this assessment occasionally meet or exceed the vibration criteria in DIN 4150 (see Table 2) for buildings highly sensitive to vibration, e.g. heritage buildings. Therefore, cosmetic or structural damage may have occurred during the periods of measurement of this assessment.
Yours faithfully
RCA ACOUSTICS
Acoustic Consultant
Page 12
7 REFERENCES
[1] German Institute for Standardisation, DIN 4150-3 (1999): Structural vibration – Effects of vibration on structures.
[2] British Standards Institution, BS 7385-2 (1993): Evaluation and measurement for vibration in buildings. Guide to damage levels from ground-borne vibration.
[3] British Standards Institution, BS 5228-2 (2009): Code of practice for noise and vibration control on construction and open sites – Part 2: Vibration.
[4] NSW Environment Protection Agency, Assessing Vibration: a Technical Guideline, February 2006
[5] British Standards Institution, BS ISO 4866 (2010): Mechanical vibration and shock. Vibration of fixed structures. Guidelines for the measurement of vibrations and evaluation of their effects on structures.
Appendix A
Weekly Data
0.0
1.0
2.0
3.0
4.0
5.0
6.0
P ea k p a rt ic le v el o ci ty (m
m /s )
Date & time
Vibration levels component peaks, The Carlton 69 Oct 2017
Vertical Transverse Radial
0.0
1.0
2.0
3.0
4.0
5.0
6.0
m /s )
Date & time
Vibration levels vector sum peak, The Carlton 69 Oct 2017
Vsum
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
m /s )
Date & time
Vsum
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
m /s )
Date & time
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
m /s )
Date & time
Vsum
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
m /s )
Date & time
0.0
1.0
2.0
3.0
4.0
5.0
6.0
m /s )
Date & time
Vsum
0.0
1.0
2.0
3.0
4.0
5.0
6.0
m /s )
Date & time
0.0
5.0
10.0
15.0
20.0
25.0
m /s )
Date & time
Vibration levels vector sum peak, The Carlton 30 Oct6 Nov 2017
Vsum
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
m /s )
Date & time
Vibration levels component peaks, The Carlton 30 Oct6 Nov 2017
0.0
1.0
2.0
3.0
4.0
5.0
6.0
m /s )
Date & time
Vibration levels vector sum peak, The Carlton 613 Nov 2017
Vsum
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
m /s )
Date & time
Vibration levels component peaks, The Carlton 613 Nov 2017
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
m /s )
Date & time
Vsum
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
P e a k p a rt ic le v e lo c it y (m
m /s )
Date & time
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
m /s )
Date & time
Vsum
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
m /s )
Date & time
Figure 20 Vibration logging, Vector Sum 24-26 November (Race days)
Figure 21 Vibration logging, Component Peaks 24-26 November (Race days)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
m /s )
Date & time
Vibration levels vector sum peak, The Carlton: Race Days Nov 2017
Vsum
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
m /s )
Date & time
Vibration levels component peaks, The Carlton: Race Days Nov 2017

13177-401-2 carlton building vibration monitoring · 2019. 2. 25. · john davies the carlton...

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