Construction Of Spatial Temperature Distribution Model Of Solar Greenhouse

If the continuous collapse of a multi-span greenhouse structure occurs,it will cause huge economic losses and pose hidden dangers to employees and production facilities.Therefore,it is necessary to conduct continuous collapse research on greenhouse structures and improve the theoretical system of anti continuous collapse design for typical multi-span greenhouse structures.This article analyzes various methods for continuous collapse analysis and selects the backup load path method for continuous collapse analysis.Regarding the structure of multi-span greenhouses,the following work was carried out: Firstly,research was conducted on multi-span greenhouses with different structural forms in multiple regions in China.Taking Xianyang City,Shaanxi Province as an example,a Venlo type multi-span greenhouse that meets the local climate and environmental conditions was designed as a typical greenhouse.Use MIDAS-GEN to optimize the overall structure according to existing specifications,so that the structure can meet the usage requirements under various working conditions.Secondly,establish a model in ANSYS for static analysis,using two methods: stress method and energy method to analyze the distribution pattern of key columns in the overall structure and discuss the internal causes of their distribution pattern.Thirdly,through implicit dynamic analysis,representative columns of various types in the greenhouse structure are selected and sequentially dismantled for collapse analysis.In response to the potential collapse hazards discovered after demolition,the cross-section of the key columns was optimized,and a random column optimization plan with the same number of columns as the key column optimization plan was set as a control.The effectiveness of the continuous collapse simulation of the optimized structure was compared to determine the optimization effect of the key columns.Fourthly,establish a three span multi-span greenhouse and repeat the previous steps to verify the reliability of the key column optimization method.The main conclusions of the study are:(1)In the study of structural optimization of multi-span greenhouses,the method of dismantling components has applicability and operability;The key components and their distribution laws obtained by the two bar sensitivity evaluation methods based on stress and energy are basically the same,which can complement and verify each other,reduce errors and contingency,and improve accuracy and scientificity;The implicit dynamics module in ANSYS can fully simulate the entire process of structural damage and even collapse after column removal,and understand whether the structure responds to various situations throughout the entire process.(2)The distribution pattern of column sensitivity coefficient in Venlo type glass multi span greenhouses of different scales is similar.The average distribution of sensitivity values for various columns of the structure is as follows: center column>short edge column>long edge column>corner column.Among them,the central columns near the first and last ones have the highest sensitivity;Other mid columns and short edge columns connected between spans have sub high sensitivity;The sensitivity of other short edge columns to all long edge columns is moderate;Corner columns have the lowest sensitivity.(3)The sensitivity of columns is positively correlated with the probability of continuous collapse after removal.In a multi-span greenhouse,optimizing the cross-section of the central column and the short edge column connecting the span to span can significantly improve the structural resistance to continuous collapse.The optimization method for key components has its unique advantages,which can not only improve structural safety but also meet the needs of reducing costs.The theory of continuous collapse can provide strong support for the structural design optimization of multi-span greenhouses.