An Efficient Algorithm for Multi-dimensional and Multi-point Random Seismic Response Analysis of Spatial Grid Structure based on Computer
International Journal of Multimedia Computing · 2023
At present, the power spectrum method in the field of random vibration analysis, that is, to calculate the power spectrum of various responses from the given excitation power spectrum, has developed into a mature method.However, this method has not been widely used in engineering design in the past.The purpose of this paper is to study the efficient algorithm of multi-dimensional and multi-point random seismic response analysis of spatial grid structure.Firstly, the paper introduces the quick assessment of earthquake personnel loss from the aspects of the factors affecting the magnitude of earthquake disaster and the assessment process of earthquake personnel loss.Then, it further discusses the theoretical formula of multi-dimensional virtual excitation method, further extends the "virtual excitation method" to the multi-dimensional multi-point non-stationary random earthquake response analysis of spatial grid structure, gives the peak response estimation method, and discusses the multi-dimensional ground, the random model of vibration and the selection of parameters, the random seismic response of latticed shell structure is analyzed by special computer program.The experimental results show that the non-stationary random seismic response of the latticed shell is slightly smaller than that of the stationary random seismic response, with a ratio of about 0.9.The laws of the steady and non-stationary random vibration response of the latticed shell members are similar.and cultural level, and the progress of science and technology, how to effectively use the existing data and data, and apply new methods to improve the ability of the government and the earthquake department to respond quickly to emergencies and resist risks, and provide convenient and quick emergency rescue and related information for the masses is particularly important [1-3].Earthquake disaster pre assessment software is a software system that integrates multiple disciplines, such as computer, geographic information system, global positioning system, monitoring system, earthquake disaster pre assessment system, statistical system, etc., integrates multiple data through network, communication and other channels, and provides earthquake emergency services and earthquake disaster pre assessment [4][5][6].The earthquake disaster pre assessment software can effectively simulate the geological disaster, building collapse, lifeline engineering damage, casualties, economic loss and other disasters after the earthquake.According to the simulated disaster data, the pre disaster preparation work can be done, so that the disaster prevention and mitigation can be implemented, and provide more effective technical support for the post disaster leadership and organization of earthquake relief work [7][8][9].Earthquake is a kind of emergency.Earthquake disaster often has the characteristics of strong emergency, high pressure, wide impact, great social impact, long duration, some quasi periodicity and so on.Earthquake disasters often cause serious casualties and economic losses, and can cause secondary disasters such as sand liquefaction, collapse, landslide, debris flow, avalanche and tsunami [10][11][12].The earthquake will cause serious casualties, the key reason is that the occurrence of the earthquake will cause serious housing damage [13][14][15].In order to reduce the damage caused by the earthquake and make the building structure resist the possible earthquake within the service life, the earthquake resistance ability of the structure should be enhanced as much as possible.The large-span grid structure is a spatial structure system, showing obvious spatial stress and deformation characteristics [16].Therefore, the combined action of horizontal and vertical earthquake should be considered in the seismic response analysis of spatial grid structure.It can be seen that the analysis of structural seismic response is of great significance [17].J.An studied the seismic response characteristics under strong horizontal ground motion, and compared with the seismic response characteristics of single-layer rectangular / circular tunnel.The results show that the interaction effect of the two-layer tunnel increases the peak value of the relative horizontal displacement and vibration acceleration of the upper and lower tunnels, and decreases with the increase of the intersection angle.The seismic stress of the top rectangular tunnel increases, while that of the bottom circular tunnel decreases.The interaction effect of cross metro tunnel is closely related to the cross shape of bedrock and the characteristics of input seismic wave.The weak parts of the tunnel structure are the rectangular top of the top layer, the connection between the layer and the side wall, the top and bottom of the column (middle column), the arch shoulder and the circular top of the bottom layer.The seismic deformation modes of rectangular and circular tunnels are similar to the monotonic growth of sinusoidal and inverted S-shaped curves, respectively.The deformation of site soil is mainly shear deformation.When the earthquake occurs, the contact surface between soil and structure is weak [18].Christelle Salameh conducted a risk and vulnerability assessment of the dynamic parameters of buildings in Beirut (Lebanon) based on the environmental vibration method.Lebanon is facing a high seismic risk due to its major faults, high seismic risk due to intensive urbanization, and lack of implementation of seismic design codes.In this study, 330 reinforced concrete buildings were recorded for environmental vibration, periodic parameters were extracted and analyzed statistically to determine the correlation with physical building parameters (height, horizontal size, age) and site characteristics (rock site or soft site).The results show that: (1) building height or number of floors (n) is the main statistical robust parameter for estimating fundamental wave period T; (2) the correlation between T and N is linear and related to the site: for rock site t ≈ n / 23, for soft site n / 18; (3) the measured damping is inversely