HFFB wind-induced vibration analysis method of high-rise building considering vibration mode deflection angle

Abstract

The invention discloses a high-rise building HFFB wind vibration analysis method considering vibration mode deflection angle, which comprises the following steps: according to the high-rise building structure of the building to be measured, obtaining the structural dynamic parameters of the building to be measured by combining finite element model analysis; The first mode stiffness and the first mode damping of the first two shimmy modes of the tall building structure are calculated according to the dynamic parameters of the structure. According to the height of the building to be measured andthe angle between the first two modal vibration directions and the geometrical principal axis, the modal force spectrum matrix is constructed. Calculating a second modal mass, a second modal stiffness and a second modal damping of the high-rise building according to the first modal mass, the first modal stiffness and the first modal damping; According to the modal force spectrum matrix, the bending moment response of the structure is calculated. The present embodiment can consider the inconsistency between the modal spindle and the geometric spindle, and can also consider the correlation of the modal vibration of each order, and can effectively improve the computational accuracy of the wind-induced vibration response analysis of the high-rise building based on the HFFB technology.

Description

technical field [0001] The invention relates to the technical field of a wind vibration analysis method, in particular to a high-rise building HFFB wind vibration analysis method considering the deflection angle of a vibration mode. Background technique [0002] High Frequency Base Force Balance (HFFB) technology is one of the most commonly used test methods in wind-induced vibration analysis and wind-resistant design of high-rise buildings. The purpose is to obtain the six-component aerodynamic load signal acting on the bottom of the structure, and then obtain the modal force of the high-rise building in the first second-order roll mode direction and first-order torsional direction based on the linear mode assumption, and analyze the structural wind-induced response. For regular buildings, the modal vibration principal axis of the structure generally coincides with or is relatively close to the geometric principal axis. In this case, according to the basic assumption that t...

AI Technical Summary

Problems solved by technology

However, with the continuous increase in the height of high-rise buildings and the emergence of novel structural forms, the geometric principal axis of the structure often has a significant deviation from the principal axis of modal vibration, which makes the aforementioned traditional methods lose their applicability.

On the other hand, the traditional method is to analyze the wind-induced response of different modes separately, without considering the coupling effect between modes

This also affects the calculation accuracy of the structural wind-induced response

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