Limit to the tension reinforcement ratio in flexural high strength reinforced concrete (HSRC) members is
based on the requirement that tension failure as sufficient rotation capacity are ensured at ultimate limit state.
However, the provisions for the total amount of longitudinal reinforcement ratio ( and ) are not associated with
any rational derivation. In this paper, a quantitative measure to evaluate an upper limit to the compression
reinforcement ratio of flexural HSRC members is proposed. The quantitative criterion to can be derived
from i) steel congestion and ii) considerations that are related to the diagonal compression bearing capacity of the
members. In this paper it is shown that, when shear loading is dominant, the limit to is set by the diagonal
compression criterion. Parameters that affect this limit are deeply investigated and the expressions were derived for
different end conditions, to provide an additional tool for a better design and assessment of the flexural capacity of
HSRC members.
