Seismic Damage Simulation Of Masonry Structure Based On City Engine

With the development of Smart City emerging concept,the construction of 3D City earthquake disaster scene of overall planning for earthquake rescue and prevention of earthquake disaster prevention drills have an irreplaceable role.Three-dimensional earthquake disaster scene can directly show the damage of the building in the earthquake,provide guidance of the building for the earthquake drills,and provide help for emergency rescue and earthquake loss assessment.At present,the development of3 D city modeling technology is very fast,but seldom used in the earthquake.The main reason is the mainstream method of domestic method is currently used for building single modeling,and then imported into the geographic information platform.This method is limited by computer performance,and have long time for modeling.The building have five destroy grade in the earthquake,the monomer modeling requires the establishment of the 5 models of a building,but also according to different damage grades into building model,which makes the modeling working increases greatly,and the change speed of model is greatly reduced,so we need a 3D simulation technology on city level,which can achieve the required precision three-dimensional system,at the same time to ensure the efficiency of modeling,and to ensure that different damage level change model is more simple and convenient.With the development of geographic information technology,the analysis and processing of two-dimensional geographic information can not meet the needs of people,and more information of urban three-dimensional simulation technology has become the mainstream of the times.In recent years,with the development of the concept of smart city,3D modeling on city level technology has been greatly improved,but also encounter new problems,the city level construction simulation technology needs to reach a certain degree of architectural models,while also taking into account the computer performance,as well as three dimensional scene establishment period.The mainstream now is use tilt photography with three-dimensional geographical information platform in City 3D modeling technology,use tilt images with architectural property photography,achieve the model precision and modeling efficiency and improve the effect of operation on computer performance requirements.And using the manual method of building model into geographic information platform,this method is generally used for the project planning,and municipal engineering management,with the problem that the model of high precision modeling,long cycle,large amount of data,high requirements on the computer,and the cost is relatively high.CityEngine put forward the concept of rule modeling,visual modeling before into procedural modeling,the rules of the construction model greatly reduces the modeling cycle of city buildings,the establishment of building rule file,applied to the different attributes of the land,they built the building model.At the same time,the architectural model rule can divide thebuilding into different components,and each component can also assign different attribute values,which provides convenience for building simulation with different damage levels.In this paper,the advantages of CityEngine are used to simulate the seismic damage of masonry structures.Masonry structure building is more common in the city,for residential,hospitals,buildings etc.the building floor is not high,the building shape is relatively regular,easy to analyze the damage mechanism,damage distribution regularity exists.In China,there are still a large number of masonry structures,and it is necessary to simulate the seismic damage of masonry structures.In the masonry structure,the wall is the main load-bearing member,and the damage of the wall has a great influence on the safety performance of the structure,and the seismic damage characteristics of the masonry structure wall are also very obvious.The main research work of this paper is:1.Through theoretical analysis of the relationship between shear force and strength of masonry structural members,the calculation method of crack grade is derived and applied to the simplified model,which provides a theoretical basis for the distribution of seismic damage of masonry structure.2.By the actual examples of statistical analysis of seismic damage of masonry structure distribution,design examples of statistical methods,the calculation process design of masonry structure damage distribution,according to the statistical results,get the damage distribution function L(d),M(d),H(d),F(i)floor influence coefficient,influence coefficient,the influence of the shape of the component coefficient.3.In the CityEngine platform,the seismic distribution function of a simplified model is simulated by applying the distribution function of earthquake damage,and the distribution of earthquake damage of masonry structure is simulated by taking the county town of Wenchuan as an example.