| The long-span roof structure has light weight and great flexibility,and the wind load is the main control load.Strong winds are often accompanied by heavy rainfall,due to the drag effect of the airflow,the raindrops fall diagonally to the surface of the building during the landing process.The size of the airflow affects the wind-driven rain pressure on the building surface.Wind-driven rain poses a great threat to the safety of buildings.However,the relevant parameters such as wind-driven rain pressure distribution of long-span roof structures are not clearly given in the relevant codes at home and abroad.Most of the architectural structures in the actual engineering exist in the form of architectural groups.In particular,there are generally other building structures around the long-span roof structure.The distribution of wind and rain pressure of long-span roof structures will be disturbed by the surrounding structures in different degrees,and the disturbance effect will lead to the change of wind-driven rain pressure on the surface of long-span roof structures.Therefore,studying the wind-driven rain pressure interference effect of long-span roof structures under the combined action of wind and rain has important theoretical significance and engineering value for the weather-resistant design of long-span roof structures.This paper is mainly based on the Euler-Euler method,relying on the numerical simulation platform,to study the wind-driven rain pressure characteristics of the large-span roof structure considering the interference effect.The air phase and rain phase are regarded as continuous phase respectively.Under the influence of disturbance construction,the distribution characteristics of wind and rain pressure and the law of wind-driven rain pressure disturbance effect of several typical long-span roof structures（including long-span elliptic hyperbolic roof,long-span double-slope roof and long-span cantilever roof）are studied.The main research contents are as follows:（1）Based on the Euler-Euler method,the interference effect of the long-span roof structure under the combined action of wind and rain is studied.First,perform numerical simulation verification: perform numerical simulation on the model in the wind tunnel test,and compare the obtained simulation data with the wind tunnel test data to verify the correctness and reliability of the numerical simulation method;Then study the wind-driven rain pressure distribution characteristics of the large-span roof structure under the interference effect:Three typical large-span roof structures are used as the target disturbed buildings,and the disturbing buildings are arranged in series with each other.The different height differences between the disturbing buildings and the target buildings,different building spacing,different wind speeds,and different rainfall intensities are studied for each typical.The wind-driven rain pressure change rule on the roof surface and the influence of the interference effect,and the wind-driven rain pressure distribution and change rule of the typical roof under the influence of the interference effect are obtained.（2）The study defines three typical long-span roof surface wind-driven rain pressure measurement point interference factors and partition interference factors.Partition the roof of the target building and define the interference factor and partition interference factor of each structure under different interference factors.By analyzing the interference factor of the measuring point and the interference factor of the partition,the law of the wind-driven rain pressure interference effect of the three typical long-span roofs under the combined action of wind and rain is summarized;The important influencing parameters of the wind-driven rain-pressure interference effect under the combined action of wind and rain are obtained,which provides an effective reference for the study of the wind-driven rain-pressure interference effect of long-span roof structures.The main conclusions of this paper are as follows:（1）The pressure at the longitudinal ends of the long-span elliptical hyperbolic roof is the greatest.The ridge of the long-span double-slope roof is the most disadvantageous position because of the greater pressure and the largest amplification effect.The surface pressure of long-span cantilevered roof is distributed in a dispersed form,and the force at the four corners of the roof is larger.（2）The height difference between the two buildings,building spacing,wind speed,rainfall intensity and wind direction Angle have certain influence on the pressure distribution of the long-span roof.And each interference factor has different interference effects.Especially,the height difference and distance between two buildings have a great influence on the stress condition and the interference effect of roof surface,and the disturbing building has a certain shielding effect on the target building.When the height difference between the disturbing building and the target building is zero,the three types of large-span roofs receive the greatest force. |
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