Numerical Simulation Of Demolition Blasting Of Frame Shear Wall Structure In Complex Environment

With the rapid development of China’s economy,a large number of buildings need to be rebuilt.When these buildings are demolished,in order to reduce the labor force,shorten the construction period,save the cost and achieve the optimal demolition effect,the blasting method is the best choice.At present,the surrounding environment of some buildings to be demolished is relatively complex and its own stability is particularly high,so the demolition process is difficult.In the design of blasting demolition scheme,the directional collapse of buildings is often required without affecting the safety of surrounding buildings,so it is very important to design a reasonable demolition blasting scheme.In order to achieve this goal,this paper takes the frame shear wall structure as the research object,analyzes the different demolition blasting methods,balance and collapse instability process.Through the technical route of combining theoretical analysis,numerical simulation and practical engineering,the main work and conclusions are as follows:(1)Through the comparison of four different demolition blasting methods,depth analysis of their application conditions in different environments and the design of blasting cut,we can get the best demolition blasting method of buildings.(2)In this paper,the process of building’s balance and collapse instability is analyzed theoretically.Through the study of the center of gravity and balance instability of the building,the design basis for the blasting scheme of frame shear wall structure is provided.Because the building to be studied has a very high stability,there are many pretreatment works before demolition blasting,so it is necessary to study the weakening treatment method of the building to be demolished(that is to reduce the building Stability before demolition blasting).(3)Based on the analysis of the surrounding environment and structural characteristics of the building,the blasting mode of directional dumping demolition is finally selected,and the numerical model of demolition blasting of frame shear wall structure is established.In the process of building numerical model,select solid 164 element,mat brittle damage material model,and calculate d3plot by ANSYS/LS-DYNA software The file is imported into ls-prepost post post-processing software to observe the process of building demolition and blasting collapse,analyze the stress damage during the collapse process and the displacement change of the unit.(4)By comparing the numerical simulation with the actual engineering demolition blasting process,it is found that the reduction degree of the numerical simulation to the demolition blasting process of the frame shear wall building is high.It is feasible to use the finite element numerical simulation technology to simulate and analyze the instability and collapse process of the demolition blasting of the building,which proves that the numerical model established in this paper is very stable for the frame shear wall structure building The study of demolition blasting is of great significance.