Taking the straight mortise-tenon joint in Yunnan traditional timber structure as the research object, the load-displacement hysteresis curve is obtained by low-cycle reciprocating test, and the error caused in the preparation stage of the test is analyzed and discussed. Combined with the characteristics of the load-displacement hysteresis curve of the straight mortise-tenon joint, the load error is determined in the load time history, and the corresponding displacement error is calculated, so as to realize the correction of the hysteresis curve. Based on the embedment and friction theory of the straight tenon joint, the causes and calculation methods of embedment energy, friction energy and elastic potential energy in the straight tenon joint are analyzed, and the rationality of using SAWS restoring force model to describe the straight tenon joint is discussed. For the proposed parameter identification method, primary parameters are firstly determined according to skeleton curves, unloading curves and frictional slip segments. Thereafter, the Bayesian optimization algorithm is employed to calibrate residual parameters with the shape similarity as the optimization objective, and the final restoring force model for straight tenon joints is established. The proposed identification method is concise and effective, which can provide references for the design and performance evaluation of similar traditional timber structures.
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