Experimental investigation and numerical analysis for concrete-CLT connections. (10th March 2020)

• Record Type: Journal Article
• Authors: Cao, Jixing; Xiong, Haibei; Wang, Zhifang; Chen, Jiawei
• Is Part Of: Construction & building materials. Volume 236(2020)
• Publication Date: 2020-03-10
• Subjects: Concrete-CLT connections -- Mechanical properties -- Parameter identification -- Unscented Kalman filter -- Energy-based damage assessment; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.117533
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Failure modes of concrete-CLT connections under cyclic loading. The mechanical properties of connection are investigated. The UKF is employed to identify the parameters of SAWS model. Two assessment methods are proposed to evaluate the estimation results. Abstract: The mechanical characteristics of concrete to cross laminated timber (CLT) connections plays an essential role in a hybrid structure. This study mainly deals with an experimental and numerical study on the load-slip behaviour of concrete-CLT connections under cyclic loading, where six specimens with two different loading types (i.e., parallel and perpendicular to the grain of CLT) were executed. The failure modes of all specimens were the bolts shear off at the location of the interface between concrete and CLT, associated with the cracking and splitting of CLT panels depending on loading directions. Then the numerical model whose nonlinearity is concentrated on the spring element is created. To calibrate the model parameters, the procedure of parameter estimation using unscented Kalman filter (UKF) is employed to identify the parameters of a hysteresis model. Two assessment methods, including the equivalent energy elastic-plastic curve assessment and an energy-based damage assessment, are used to comprehensively evaluate the estimated result. The model estimate is consistent with the experimental result, demonstrating the identified parameters having good accuracy. The calibrated parameters of a hysteresis model provide a good database when such type of connections are incorporated into a finite element model of a structural system.