Flood Flow Load Experiment And Its Effect On The Numerical Simulation Of Village Buildings

Since the 21 st century,due to the combined effects of global climate change and village development,the frequency of natural disasters has continued to increase,and the losses caused are also on the rise.Flood disasters have caused the largest economic losses among various natural disasters and have become a serious threat.One of the important factors of our people’s life and property and the sustainable development of society.Floods will cause greater damage to buildings in floodplains.At present,there are few studies on the damage assessment of rural houses based on the effect of flood depth and velocity.This article intends to use a combination of model tests and numerical simulations to study floods and houses with different water depths and flow rates.The relationship between the degree of damage and guide the practice of flood fighting.Through the collection and analysis of a large amount of flood disaster data,this article first introduces the concept,characteristics,classification,distribution,flood effects and main structural forms of village buildings.Flood load research is the basis of building vulnerability research in floodplains.Through model tests,study the flow pressure of floods with different water depths and velocities on the surface of the building and its distribution law.In the experiment,an adjustable water outlet was set in the wave-flow water tank to control the depth and flow rate of the water flow on the upstream surface of the model.The experimental model was divided into two layers,with a hole on the first layer and no hole on the second layer,which was fixed downstream of the water outlet.The results show that the flow velocity distribution on the front face of the model is not uniform,and the water pressure gradually decreases from bottom to top.Based on the experimental data,it is found that the hydrodynamic pressure increases with the increase of the flow velocity,and the relationship is nonlinear.Based on this,the hydrodynamic pressure is proposed.The pressure correction coefficient improves the calculation formula of the water flow pressure;the water flow pressure and the water depth are approximately linear;the opening and the boundary will reduce the water flow velocity and the water pressure on the upstream surface to a certain extent.Based on the study of flood flow pressure,this paper selects two typical structural forms of village houses: masonry structure and wood structure,and completes the numerical simulation of flood house building by compiling finite element program.The results of numerical calculation are used to compare and analyze the structural damage under different working conditions: 1.Under the condition of the same flood flow velocity,the comparative analysis of different flow depth and model failure is carried out;2.Under the condition of the same depth of flood flow,comparative analysis of different flow velocity and model failure.According to the results of numerical calculation and analysis,considering the relationship between flood depth,flow velocity and structural damage degree,the flood resistance evaluation suggestions suitable for masonry structure houses and wood structure houses are put forward respectively.The research results provide the basis for flood resistance design and flood resistance capacity evaluation of housing buildings in flood area.