STRUT-AND-TIE MODELS FOR HEADED 1 BAR DEVELOPMENT IN C-C-T NODES

This study presents strut-and-tie models (STM) explaining the development of bond strength along bonded length together with anchorage by head bearing of headed bars. The anchorage at a head requires construction of a biaxial compressed nodal zone and bond resistance needs to use the concept of a smeared node. This model consists of a strut with the nodal zone at head for head bearing and fan-shaped stress field for bond stresses along the development length. This modeling clarifies interaction between head bearing and bond resistances where a bond transfers along the development length of headed bars is necessary for a smooth force flow. The experimental results For series of headed bars with relatively small area of plate heads are interpreted 1 by this proposed model.