Development of Design Procedures for Flexural Applications of Textile Composite Systems Based on Tension Stiffening Models

• Main Author: Mobasher, Barzin
• Other Authors: Technische Universität Dresden, Sonderforschungsbereich 528
• Format: Others
• Language: English
• Published: Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden 2011
• Subjects: Bemessungsverfahren; Modellierung; Biegung; Verbundmechanismen; Zugversteifung; design procedures; modelling; flexion; bond mechanisms; tension stiffening; ddc:690; rvk:ZI 7100
• Online Access: http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-77984; http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-77984; http://www.qucosa.de/fileadmin/data/qucosa/documents/7798/22_Mobasher_web.pdf

The Aveston Copper and Kelly (ACK) Method has been routinely used in estimating the efficiency of the bond between the textile and cementitious matrix. This method however has a limited applicability due to the simplifying assumptions such as perfect bond. A numerical model for simulation of tensile behavior of reinforced cement-based composites is presented to capture the inefficiency of the bond mechanisms. In this approach the role of interface properties which are instrumental in the simulation of the tensile response is investigated. The model simulates the tension stiffening effect of cracked matrix, and evolution of crack spacing in tensile members. Independent experimental results obtained from literature are used to verify the model and develop composite tensile stress strain response using alkali resistant (AR) glass textile reinforced concrete. The composite stress strain response is then used with a bilinear representation of the composite obtained from the tensile stiffening model. The closed form and simplified equations for representation of flexural response are obtained and used for both back-calculation and also design. A method based on the average moment-curvature relationship in the structural design and analysis of one way and two way flexural elements using yield line analysis approaches is proposed. This comprehensive approach directly shows the interrelation of fundamental materials characterization techniques with simplified design equations for further utilization of textile reinforced concrete materials.