TY - JOUR
T1 - A vibration-based approach for the estimation of the loss of composite action in timber composite systems
AU - Dackermann, Ulrike
AU - Li, Jianchun
AU - Rijal, Rajendra
AU - Samali, Bijan
PY - 2013
Y1 - 2013
N2 - This paper presents a novel approach for the determination of the loss of composite action for timber composite systems using only measurements from non-destructive vibration testing. Traditionally, the composite action of a system is evaluated from static load testing using deflection measurements. However, static load testing is expensive, time consuming and inappropriate for existing flooring systems. The method proposed in this paper is based on the Damage Index (DI) method, which uses changes in modal strain energies, to detect locations and severities of damage. In the proposed method, a new Loss of Composite Action Index (LCAI), which is derived from direct mode shape measurements obtained from dynamic testing, is introduced to evaluate the loss of composite action. The proposed method is tested and validated on numerical and experimental models of a timber composite beam structure, which consists of two timber components that are connected with different numbers of screws to simulate various degrees of partial composite states. The results obtained from the new method are very encouraging and show a clear trend of the proposed dynamic-based LCAI in indicating the loss of composite action in the investigated timber composite structure.
AB - This paper presents a novel approach for the determination of the loss of composite action for timber composite systems using only measurements from non-destructive vibration testing. Traditionally, the composite action of a system is evaluated from static load testing using deflection measurements. However, static load testing is expensive, time consuming and inappropriate for existing flooring systems. The method proposed in this paper is based on the Damage Index (DI) method, which uses changes in modal strain energies, to detect locations and severities of damage. In the proposed method, a new Loss of Composite Action Index (LCAI), which is derived from direct mode shape measurements obtained from dynamic testing, is introduced to evaluate the loss of composite action. The proposed method is tested and validated on numerical and experimental models of a timber composite beam structure, which consists of two timber components that are connected with different numbers of screws to simulate various degrees of partial composite states. The results obtained from the new method are very encouraging and show a clear trend of the proposed dynamic-based LCAI in indicating the loss of composite action in the investigated timber composite structure.
KW - composite materials
KW - floors, wooden
KW - nondestructive testing
KW - structural dynamics
UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:41404
U2 - 10.4028/www.scientific.net/AMR.778.462
DO - 10.4028/www.scientific.net/AMR.778.462
M3 - Article
SN - 1022-6680
VL - 778
SP - 462
EP - 469
JO - Advanced Materials Research
JF - Advanced Materials Research
ER -