Abstract
Nonlinear behavior is often observed in structural joint system due to external loads. A new technique of nonlinear structural joint model updating with static load test results is proposed in this article to investigate the actual behavior of a joint system. To calibrate the nonlinear parameters of the structural joint system, an appropriate finite element model is first established to characterize the complex nonlinear behavior caused by the joint connections. Combined with the sensitivity analysis, the parameters that describe the nonlinear behavior of the joint connections are selected as the parameters to be updated. Subsequently, an objective function is created in accordance with the residual between experimentally measured static deflections and analytically calculated static deflections through finite element model. The objective function is then optimized to obtain the proper values of the nonlinear force–displacement parameters with the regular simulated annealing algorithm. To validate the efficiency of this updating approach, two numerical examples under static concentrated loads are conducted. The obtained results indicate that the nonlinear joint model parameters can be successfully updated, and the updated new model can further forecast the true deflections of the nonlinear structure with good accuracy and stability.
Highlights
Joint connections exist widely in many large-scale complex structures
This study focuses on developing a physically meaningful model to characterize the complex nonlinear behavior of the joint system under static loads
Considering the truth that static deflection of a structure is among the most important responses that can reflect the accuracy of the analysis, in this article, li is suitably defined as vertical deflection of selected node i obtained by the analysis using ANSYS finite element analysis software and xj is the jth parameter variable which may be used later for model updating
Summary
Joint connections exist widely in many large-scale complex structures. Static and dynamic responses of these structures are significantly affected by the joints due to their complicated and nonlinear properties. Davoodi et al.[19] introduced a general nonlinear relationship of joint connections and considered the curve coefficients as the parameters to be updated. À Dxj) xj li(xj) ð1Þ with generalized nonlinear force–displacement capability is introduced to model the joint connections for nonlinear finite element model analysis This element can be applied to simulate the longitudinal force– displacement or torsional moment–rotation relationship in 1D to 3D systems. Considering the truth that static deflection of a structure is among the most important responses that can reflect the accuracy of the analysis, in this article, li is suitably defined as vertical deflection of selected node i obtained by the analysis using ANSYS finite element analysis software and xj is the jth parameter variable which may be used later for model updating
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