Reliability Analysis Of Beam String Structure Based On Multiple Linear Uniform Support Vector Machine Under The Random Load Ratio

Prestressed beam string structure is one of common new structure among the large-span steel building. The beam string structure is relatively simple, relatively light weight and appearance, etc. That makes this structure get more and more popular among the various public buildings. Therefore, in order to ensure the prestressed beam string structure to meet regulatory requirements, "the ability to design", prestressed beam string structure analysis was performed under effects ratios of different loads. In this paper, the performance of the bearing beam string structure under different proportions of full across load and half across load is analyzed by ANSYS considering double nonlinearity. Bearing failure characteristics of beam string structure under effects ratios of different loads are obtained.SVM (Support vector machine) is a machine learning methods that have been proposed based on statistical learning theory. SVM has been applied to combine with traditional method of reliability, now. And, reliability calculation method based on SVM has been proposed. In this paper, the problems of selecting Kernel function and parameter optimization are solved by using the tactics of multiple linear SVM. It means that the nonlinear function of the structure is replaced by linear equations. The reliability calculation method based on multiple linear SVM proves to be stable and viable comparing with Monte Carlo Method through a numerical example. Then, this method is applied for reliability analysis of prestressed beam string structure to fit the implicit linear equations of beam string structure.At last, after the introduction of random parameters of computing model uncertainty, reliability of prestressed beam string is analyzed and compared by different design methods basic on the linear failure equations. Studies have shown that reliable indicator of beam string structure will be significantly decreased, with the ratio of load effect increases. Using load factor method to design the beam string structure under effects ratios of different loads is more stable than safety factor calibration method. Safety factor or load partial factor of beam string structure design should be increased appropriately, when the half across load has a large proportion.