Precast Structure Connection Node Reliability Analysis Based On BFO Algorithm

With the development of Chinese economy,the application of the prefabricated concrete structure is more and more widely.Part of prefabricated structure components are finished in the factory ahead of time.This makes the prefabricated structure has many advantages,such as environmental protection,energy saving.These advantages make prefabricated building obtain more attention by designer.In order to guarantee the reliability of prefabricated frame structure,the node design usually complicated,that cause the cost of node is too high,and the application of prefabricated shear structure is restricted.Based on this,the reliability analysis of connection node is particularly important.Bacteria foraging optimization algorithm is a new type intelligent optimization method based on biological technology development.How to use computational intelligence optimization algorithm to analysis reliability of prefabricated concrete structure connection node,is a difficult point will be discussed.The main work are as follows:(1)Introduce the prefabricated concrete shear structure research status,as well as the connection style of prefabricated shear structure.The finite element software is used to simulate and analyze the computational model.According to the stress analysis nephogram of reinforced concrete corbels and steel corbel,to derived carry capacity calculation formula on the basis of above two kinds of connection nodes.(2)The chaotic initialization and information entropy are applied to the improvement bacterial foraging optimization algorithm.That way achieve adaptive regulation of bacterial foraging optimization algorithm and make the distribution of the initial solution is closer to the global optimal solution,the global searching ability is improved.The improved algorithm is tested by a ten bar truss and four standard test functions,and the results are compared with other algorithms.(3)The purpose of the reliability analysis of node is to verify the safety of the prefabricated structure.Combined with the basic design theory of the connection node,the connection node is simplified and an equivalent simplified calculation model is obtained.Then based on the geometric meaning of the reliability index,a simplifiedequivalent model is established.Afterward according to the principle of equivalent probability,the non-normal random variables are transformed into standard normal random variables.The limit state equation is established based on standard normal space.Therewith the limit state equation is taken as the constraint,and the shortest distance between the limit state surface to the far point is searched based on the improved bacterial foraging optimization algorithm.That is reliability index.The improved bacterial foraging optimization algorithm is applied to solve the reliability analysis of the precast concrete structure,and achieved an ideal expected results.The combination of computational intelligence theory and assembly structure provides a new inspiration for the development of China's construction industry.