Study Of The Interference Effect Between Two Buildings Based On The Wind Loading And Flow Field Analyses

In recent years,with the development of modern cities,many of the same or similar rectangular-section high-rise buildings are appearing in a small range of height and density,which makes the mutual interference effect between buildings more complex.Efficient and accurate assessment of wind between buildings Interference is especially important.However,the existing interference research mainly focuses on the interfering buildings with the same cross-sectional dimensions.The interpretation of the interference mechanism under the action of the rectangular cross-section is also insufficient,which obviously cannot fully explain the interference effect between buildings.Based on the above deficiencies,this thesis studies the aerodynamic load interference effect of disturbed buildings under the action of rectangular cross-section buildings through wind tunnel synchronous pressure test and three-dimensional numerical simulation.In this paper,the rigid synchronous pressure measurement test is used to analyze the wind-induced interference effect of the rectangular cross-section building with an aspect ratio of 2 on the interfering building.In this paper,we first study the wind-induced disturbance of overall wind loads in tandem,parallel and staggered situations,and then further expand the effect of wind direction on the overall wind load,and observe the vortex shedding of the whole disturbed building by the power spectral density of the global load;The interference effect of rectangular interfering buildings on overall wind loads under disturbance.The results show that for the mean base moment interference effect,when the rectangular cross-section interfering building is located in front of the square interfering building,the uniform law of the mean base moment,the mean base across-wind moment and the mean torsional base moment is c onsistent.The closer the building is to the disturbed building,the more obvious the interference effect.When the disturbed building is present,MIF_MD,MIF_ML,and MIF_MT are 1.24,2.26,and 1.36,respectively.For the rms load interference effect,the int erference factor RIF value of the disturbed building is more regular.Based on the results of overall wind load test,this paper further analyzes the interference effect of local wind load with the disturbance position and wind direction under the rectangular cross-section building.The results show that when the global mean downwind load of the disturbed building reaches the maximum at different positions and wind directions,the local mean along-wind load value also reaches the maximum value at the corresponding position and wind direction.For the across-wind local force,the local mean across-wind load value shows a similar law to the local along-wind load value,that is,the closer the disturbed building distance is to the disturbed building distance,t he stronger the interference effect.For the local rms along-wind load value,when there is a disturbing building,the local rms along-wind load value of the disturbed building is significantly increased.For the local rms across-wind load value,when the disturbed building's overall rms cross-wind base moment influence factors reach the most unfavorable position,the corresponding rms across-wind load is also its most unfavorable value.The local across-wind load spectrum is similar to the global base acro sswind load spectrum.The local across-wind power spectrum values of the disturbed buildings show a consistent regularity and trend,which in turn indicates that the vortex shedding is synchronous.Finally,the three-dimensional numerical simulation is used to study the flow field effect under the most unfavorable load conditions based on the results of global wind load and local wind load test.Comparing the average wind field,the average wind speed stream diagram,the instantaneous wind field and the instantaneous wind speed streamline diagram of the parallel position and the staggered position.When the disturbed building and the disturbed building are arranged in tandem and parallel,a shear separation layer is formed behind the disturbed building and the disturbed building,where the wind speed behind the disturbed building and the disturbed building is low,and the gap between the two buildings is formed.In the higher wind speed zone,there is no interaction between the shear separation layers separated by the parallel and staggered positions.