Dynamic testing of a high-rise monolithic building

Résumé fourni par la source

The task is to determine the dynamic characteristics of a 35-storey monolithic building in the city of Almaty. Dynamic tests were performed using a V-3 inertial vibration machine installed on the building floor. Oscillations were recorded using a digital instrumentation system. The results of dynamic tests of a 35-storey building of a frame-wall structure (monolithic) were obtained. For the first time, vibration periods were obtained for the first three vibration forms of a high-rise building, respectively, 1.38 s; 0.38 s; 0.195 s. Values of accelerations are determined by 3 forms of oscillation of buildings, respectively, 0.016 g, 0.199 g, 0.240 g. Dissipative properties of a high-rise building were estimated (logarithmic decrement of oscillation by oscillation forms 0.08 – 0.22). Somewhat unexpected here was the relatively small magnitude of the logarithmic decrement of the first form – 0.08. The features of the building behavior under dynamic impacts and the assessment of the ability of floor disks to distribute horizontal seismic loads between vertical elements were studied. The RMS acceleration of the first three forms is 0.312 g. After vibration tests, no damage or cracks were noted in the bearing structures of the building. In some partitions, cracks with a small opening are noted, which are formed, as a rule, at the junction of non-bearing structures with bearing ones. Conclusions are drawn about the need to adjust regulatory documents in construction. The results of the work can be used in the design of high-rise monolithic buildings.

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