dynamic response of the civil engineering structures due to microtremor
Increasing demands on speed increase, higher axle pressures on transportation, overdimensional and heavy loads cause simultaneous increase of unfavorable traffic effects on the structures of railways, roadways, highways and facilities on them and on structures and buildings in the vicinity of busy roads and railways. The theoretical and experimental investigation of traffic effects on the industrial buildings structure in the KINEX a.s Bearing Processing Building Complex at Byta are described in this paper.
The complex of bearing processing buildings
in the KINEX a.s Byta consist of 9 industrial halls with concrete - steel structures. The processing building M6 used for production bearings is tailored to technological function is the nearest building to new constructed road with busy road traffic
bearing structure in processing building M6
creates reinforced concrete columns, trussed girders, prefabricated column
bases and roofing slabs. The single-deck structure is divided by modular
rectangle parts with module dimensions 12 x
Figure 1: The view of processing building M6
Finite element consulting
The two versions of computing model was created as an FE model in computing system IDA Nexis which respects all data assumed in project documentation and design calculation. The first version of the computing model considers roofing slabs as a load bearing members connected with joints to truss girders and the second version considers only the mass of the slabs. The first 10 natural frequencies and modes of natural vibration were calculated for this FE model.
Figure 2: An example of natural modes
The dynamic assessment of the processing building M6 was divided to five parts:
Experimental tests of the structure dynamic response due to production process without any microtremor effects
The dynamic soil parameters evaluation by impact tests
Experimental tests of the structure dynamic response due to construction machines during road under construction
Experimental tests of the structure dynamic response due to road traffic means
Data processing and evaluating
The important areas of these tests were to observe microtremor effects on:
Safety of the building structure
Sensitivity of the very precision machines vibration.
The set of accelerometers (BK 8306) were used for measurement of global and local vibrations in the most representing areas and points of M6 structure . The structure vibration amplitudes were recording using A/D converters, filters, portable computer (PC/DX4) with relevant
The recorded signals (Figure 3) were analyzed in laboratory of the Department of Structural Mechanics (CEF - University of ilina) using amplitude (Table 1), frequency and amplitude - phase analysis, by method of spectral and correlation analysis using two channel frequency analyzer connected via GPIB with relevant software (DISYS, DAS 16).
Figure 3. Time history of structure vibration due
Table 1. Comparison max vRMS velocity vibration amplitude at the nearest structure point to road
Figure 4 shows power spectral spectrum Gv(f) measured at point B 38-x and Figure 5 illustrates the cross power spectrum between points B5 and B6 in horizontal directions. Positions of structure measured points are described in .
Figure 4: The power spectral density Gv(f) at point
B599 due to processing + road traffic effect.
Figure 5: Cross power spectrum SD(f) between points A1/A2 measured dynamic response
The tested structure processing estimation of microtremor effect as a complex of dilated parts is described in several conclusions:
Results from spectral analysis show that the frequencies area due to road traffic does not endanger neither building structures safety nor production process in building M6
Based on amplitude analysis the danger phase of structure vibrations was observed during the road under construction only. During this phase a rather in old part of building M6 were observed increasing of the structure cracks.
It is necessary to strengthen the cracked parts of building M6 structure.
Benat, J., et all. Report on Microremor Test Results in the Industrial Processing Buildings Structures in the KINEX a.s Byta. Report No. PC/37/SvF/06, Zilina
Bendat, JS. and Piersol, A.G. EngineeringApplication of Correlation and
Spectral Analysis.John Willey and Sons,
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