Digrid Structure Reliability Analysis And Material Constitutive Preference Based On Response Surface Method

In recent years, diagrid structures are widely used in the world. However, theforce of diagrid structure is complex, and force transferring path and failuremechanism remains inconclusive. Meanwhile, structure is affected by manyuncertainty factors in the process of design, construction and use. To take intoaccount the various uncertain factors, evaluating diagrid structure from the viewof reliability has advantages. Then, choosing a reliability calculation method ofdiagrid structure is the key issues of reliability analysis. This paper analyzes andselects comparatively the appropriate method for diagrid structure reliabilityanalysis, focusing on response surface methodology and optimizing the method.Afterwards, this paper realizes the parameterization model analysis applying tofinite element response surface method analysis, and ultimately realizes thereliability calculations and sensitivity analysis of diagrid structures. Specificstudies are as follows:Structural reliability calculation method. In this paper, considering thereliability diagrid structure computational requirements, select reliabilitycalculation method based on response surface method through the commonreliability calculation method comparison and study the effect of its responsesurface function form, the test point selection, iteration step, iterative pointselection on the accuracy of response surface method. The results show that, thenon-quadratic response surface functional forms meets basic accuracyrequirements; considering the accuracy and efficiency, the central compositedesign and Box-Behnken design ring is better; experimental point iteration stepcan affect reliability analysis accuracy. Finally, drawing up an iterative pointimprovement program which can reduce the step size and fitting response surfacefunction better.Diagrid structure parameterization modeling analysis. In this paper, builddiagrid substructure parameterization model in OpenSees finite element analysissoftware, and study the simulation of materials and elements. On this basis,analyze the parameterization model under inverted triangle load, and obtain theyielding order. Then, obtain the performance point information using forreliability analysis.Diagrid structure reliability analysis and component constitutive parameterpreference. Combining the response surface methodology and finite elementmethod, draw up realizable method of response surface-finite element reliabilitycalculation. Then, analyze the reliability of diagrid substructure and frame corewall substructure and obtain the conclusion that comparing to frame-corewall,the the failure probability of diagrid is smaller on the similar circumstances ofcorewall, materials and drift. Afterwards, analyze the sensitivity of diagridstructure and draw up a structure preferred method based on sensitivity analysis.