Research On Estimation Method Of Horizontal Displacement Of High-rise Buildings Under Wind Loads

In this paper,a new method for estimating the horizontal displacement of high-rise structures under different wind loads is proposed.This method combines the laser vibrometer with the inclinometer to derive the linear coefficient ? between the horizontal displacement of the structure and the inclination of the structure.law.In this paper,theoretical analysis,numerical simu lation and field test are used to study the phenomenon that the first-order mode of structure dominates the horizontal displacement contribution of the structure under the action of normal wind and typhoon.At the same time,the distributed synchronous horizontal displacement monitoring system is built.Long-term displacement monitoring of the structure.The specific research contents are as follows:A method for estimating the horizontal displacement of high-rise building structures based on the combination of laser vibrometer and inclinometer is proposed.Based on the basic motion equations of structural dynamics,the linear coefficient ? between the horizontal displacement of the structure and the inclination of the structure is derived,and the contribut ion of the displacement of the structural mode is taken as the index,and the contribution of the first-order mode to the horizontal displacement of the structure is dominant.The high-rise structure,when estimating the horizontal displacement of the high-rise structure under different wind loads,concludes that the structure can be simplified to a single-degree-of-freedom system;and the analysis of the measured data under the typhoon of Jingji Financial Center confirms the rationality of the conclusions..The feasibility verification of the coefficient ? method is carried out through the framework of the laboratory construction.In this paper,the proposed method is used to verify the proposed displacement estimation method.The structural mode contribution measured by the laser vibrometer is used as a reference.It is found that the first-order mode of the structure is dominant,but the inclinometer has obvious high-order components.In order to eliminate the high-order mode of the inclinometer,the data processing method of the two signal fitting methods is proposed.By changing the factors of the external excitation identification coefficient ? method,and comparing and verifying the results through the finite element simulation,the subsequent implementation for different structures is provided.Theoretical support.The application of the on-site high-rise structure coefficient ? method is realized and verified by numerical simulation.In this paper,the coefficient ? method is applied to the No.4 buil ding of Liyuan,and the field experiments of the strong and weak axes of the structure are carried out respectively,and the conclusion that the coefficient ? of different structural directions is different is obtained.The structure is tested by different wind loads to obtain the structure ?.The value does not change with time and can be regarded as a fixed value with height change within a certain height,and the comparison is verified by the finite element simulation result.After the laser vibrometer i s checked under different wind loads,it is verified again.Under the wind load,the first-order mode of the structure dominates the structural displacement contribution.Using the coefficient ? method to estimate the horizontal displacement of the Jingji financial center under the action of the normal wind and the typhoon.In this paper,the weak axial coefficient ? value of Jingji Financial Center is obtained through field experiment,and the long-term horizontal displacement monitoring system of Jingji Financial Center is built.Based on the long-term data collected under the operating state,the horizontal displacement of the structure under normal wind is estimated.Under the action of typhoon "Mangoscis",the measured value of the inclination meter of Jingji Financial Building is analyzed.The maximum horizontal displacement of the structure is estimated by the coefficient ? method.It is found that the first-order mode dominates the structure under the typhoon,and the structure is verified.When the h orizontal displacement is calculated under different wind loads,the first-order mode of the structure is dominant,and the structure can be simplified to the conclusion that the single-degree-of-freedom system estimates the horizontal displacement of the structure by the ? method.