Seismic performance analysis of timber frames based on a calibrated simplified model. (1st April 2022)

• Record Type: Journal Article
• Authors: Cao, Jixing; Xiong, Haibei; Cui, Yongxiang
• Is Part Of: Journal of building engineering. Volume 46(2022)
• Publication Date: 2022-04-01
• Subjects: Timber frame -- Semirigid joint -- Cyclic test -- Model updating -- Parametric study; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2021.103701
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: The timber frame is one of the most popular structural systems in the modern timber community. A full-scale test of a timber frame under cyclic loading is executed to investigate the seismic performance. The test results showed that the semirigid joints had a significant influence on the global structural response. Hence, the same type of beam-column joint was also tested to analyze the cyclic behavior. Based on the test results of the full-scale timber frame and beam-column joint, a simplified model whose nonlinearity is assumed to be concentrated plasticity is created. The nonlinear spring element is assigned to the Pinching4 model, where the features of the pinching effect, strength and stiffness degradation are considered. Because the numerical model makes some simplified assumptions that may be different from the actual structural performance, the Bayesian method is employed to update the simplified model using the test data. The statistical characteristics of the updated parameters are estimated from the posterior probability distribution, which can be used for the uncertainty and reliability analysis. The updated model is evaluated in terms of envelope curves, strength degradation and energy dissipation. The comparison results demonstrate that the updated model is accurate and reliable for parametric studies. Furthermore, the influence of gravity loading and various aspect ratios of timber structures on the elastic stiffness and the maximum loading capacity is investigated. The calibrated model of a single timber frame can be easily extended to full-scale and complex structural configurations featuring multiple timber frame structures, providing a reference for timber buildings' practical design. Highlights: Full-scale test investigation of timber frame with bolted joints. Bayesian model updating for quantifying semirigid joints' uncertainty. Parametric analysis for timber frames based on an updated model.