Multi-directional crack model for in-plane reinforced concrete under reversed cyclic actions-4 way fixed crack formulation and verification

摘要

Spatially averaged consitutive model for in-plane RC domain containing 4-way cracks is presented under reversed cyclic actions. The coupled tension-stiffness and compression model of eastoplastic and cintinuum damage are applied to the normal stress transfer across cracks. The induced average shear strain of RC plate is decomposed into local shear laong both non-orhogonal cracks on which the contact densituy model is adopted. The open/closure of spatially fised 4-way cracks are controlled by the concept of active creack coordinate. RC shells including multiple cracks up to 4-ways are examined. The analytical model proposed is verified under reversed cyclic loads.