Research And Analysis On Wind-induced Structural Safety Of Dong Ethnic Group Wooden Drum Tower In Southeast Guizho

Guizhou Southeastern Drum Tower is a characteristic building of Guizhou Southeastern Autonomous Prefecture.It is also the central representative of Dong nationality architecture and the traditional cultural symbol of Guizhou Southeastern Region.Drum tower collapses from time to time,causing damage to the economy and threatening people’s lives,leading people to question the safety of traditional wooden Drum Tower.Dong traditional drum building is a tourist landmark in southeast qianzhou.Therefore,it is very important for dong traditional drum building to carry out wind vibration response analysis.The main findings of this paper are as follows:1.By using local cedar wood in keli city,southeast of guizhou,we obtained the anisotropic properties of cedar wood,such as its compressive strength and elastic modulus,transverse compressive strength,transverse tensile strength,transverse tensile strength,shearing strength and torsion strength.2.According to the experimental loading device and the log size of Dong Drum Tower,two models of single-span cedar frame were designed and made according to the scale of 1/3.125.The experimental results were simulated and verified by ABAQUS finite element method.The skeletal curve of wooden frame has two distinct linear features,which can be simplified to represent the horizontal load-displacement relationship.Under horizontal repeated loads,both sides of the column base will repeatedly lift and rotate.3.Pulsating wind speed was simulated using linear filtering method(AR)combined with MATLAB software programming at 19 different simulated points on the drum tower.The obtained wind speed power spectrum was compared with Davenport power spectrum and the reliability of the simulated wind speed spectrum was verified.4.Using ABAQUS finite element software to simulate the drum tower model,and the modal analysis is carried out,the first ten steps of the drum tower vibration frequency and the first three steps of vibration.By comparison,the first order mode frequency obtained by the simulation is close to the result obtained by the relevant standard formula,which shows that the finite element model can really reflect the dynamic characteristics of drum building.5.The displacement,velocity and acceleration time curves of the drum tower at the angle of0~oand 45~owind direction were obtained by applying the wind speed to the finite element model of the drum tower in the form of node force.Some nodes were selected to calculate the displacement mean,acceleration mean variance and single maximum variance.The most negative wind angle of the drum tower displacement response is 0~o,that is,when the drum tower is subjected to wind load,the 0~owind angle displacement is larger than the 45~owind angle,the velocity response and acceleration response have the same rule.Drum tower is subjected to angular wind load in different wind direction.The mean displacement and the variance of acceleration increase along the height,especially when the height of drum tower is below 20 m.6.The vulnerability of Drum Tower is defined by the damage index,the probability of different damage states between the top and middle regions of Drum Tower is calculated,and the vulnerability curve of Drum Tower under 0~owind angle is plotted.