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PL
W związku z nowelizacją polskiej normy PN-B-02170:1985 (poprzednio PN-85/B-02170) „Ocena szkodliwości drgań przekazywanych przez podłoże na budynki”, która w znowelizowanej formie weszła w życie od grudnia 2016 roku jako PN-B-02170:2016–12, w pracy przedstawiono niektóre zmiany wprowadzone w ramach tej nowelizacji. Wskazano także na problemy właściwej interpretacji zapisów normy w celu poprawnego jej stosowania w diagnostyce wpływu drgań na budynki.
EN
Only some of damages which appear in masonry building are actually evoked by parsejsmic vibrations. Most of them are caused just by technical wear or other factors like foundation settlement e.g. Only vibrations of comparatively high intensity can evoke damages of masonry buildings. The paper deals with a harmfulness evaluation of vibrations evoked during driving of steel pales in the Zielona Góra center and transmitted on neighbouring masonry buildings. The harmfulness was estimated on the basis of measurements done by specialistic apparatus. The evaluation of harmfulness was performed on the basis of Polish Code PN 85/8-02170 by means of nomograms SWD. Also harmfulness of these vibrations on people present in theses buildings was evaluated as well. It was done on the basis of Polish Code PN 88/B-02171.
EN
In the paper, the action of paraseismic vibration on the underground garage wall has been presented. This wall had been separated from the surface impulsive excitation by another retaining wall. Results of the investigations, in form of diagrams of the ground and walls vibration accelerations, were prepared and presented. The influence of the retaining wall on decreasing of acceleration amplitudes of the underground wall was observed. The results obtained from the research were compared to the results calculated according to the absorption theory in the ground and generally they were close.
EN
An evaluation is presented of some of the modal maxima superposition rules, widely used to estimate the response of multistorey buildings, subjected to earthquake excitations: (1) the square root of the sum of the squares (SRSS) method; (2) the double sum combination (DSC) method; (3) the complete quadratic combination (CQC) method. The SRSS method provides good peak response estimates for the regular building, but gives the poor results for irregular building with the mass offset from the stiffuess centre, in which arise modes with closely spaced periods. It is conclude, that the DSC and CQC methods provide good response estimates of equivalent accuracy, for both the regular and irregular building models.
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