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As part of an experimental and theoretical study, the principle of operation of the console computational dynamic model proposed in the Joint venture 14.13330.2018 is considered. With the help of field tests, the actual values of the natural / resonant frequency of the test layout were determined: in the first case, it was immersed in the ground, in the second case, it was rigidly pinched at the ground surface level, which, according to the statements about the application of the proposed model, is an analog according to the principle of operation. The results showed that the value of the first natural frequency changes more than twice, and accordingly the rigidity of the structure, its stress-strain state and the actual horizontal loads change. Then it was decided to refer to the normative document SP 24.13330.2021 “Pile foundations”, according to clause 7.1.8. when calculating a pile, it is allowed to consider it as a rod rigidly pinched in the ground in a section located from the sole of the grillage at a distance l, the analytical determination of which depends on the hardness of the soil, the pile and its geometry. Additional tests were carried out to determine the natural frequency of the structure during sealing at the level of analytical calculation on piles. At the same time, with the help of mathematical modeling in the domestic Zenit-95 software, field tests were accompanied. The results showed a complete correspondence between the values of the natural frequency of a real structure operating in the ground and a structure with a rigid pinching at a distance l, which was determined analytically.

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Investigation of the Normative Computational Dynamic Model of a Building Structure Under Seismic Influence

  • 会议论文

  • 发表日期：

    2025年

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  • Sergey Tetushkin,
  • Nadezhda Ostrovskaya

摘要

As part of an experimental and theoretical study, the principle of operation of the console computational dynamic model proposed in the Joint venture 14.13330.2018 is considered. With the help of field tests, the actual values of the natural / resonant frequency of the test layout were determined: in the first case, it was immersed in the ground, in the second case, it was rigidly pinched at the ground surface level, which, according to the statements about the application of the proposed model, is an analog according to the principle of operation. The results showed that the value of the first natural frequency changes more than twice, and accordingly the rigidity of the structure, its stress-strain state and the actual horizontal loads change. Then it was decided to refer to the normative document SP 24.13330.2021 “Pile foundations”, according to clause 7.1.8. when calculating a pile, it is allowed to consider it as a rod rigidly pinched in the ground in a section located from the sole of the grillage at a distance l, the analytical determination of which depends on the hardness of the soil, the pile and its geometry. Additional tests were carried out to determine the natural frequency of the structure during sealing at the level of analytical calculation on piles. At the same time, with the help of mathematical modeling in the domestic Zenit-95 software, field tests were accompanied. The results showed a complete correspondence between the values of the natural frequency of a real structure operating in the ground and a structure with a rigid pinching at a distance l, which was determined analytically.