Optimal adjustment of EC-2 shear formulation for concrete elements without web reinforcement using Genetic Programming

Influence of the longitudinal reinforcement on the shear strength of one-way concrete slabs

“…Vtest/Vpred EC-2 GP-4 (Pérez et al 2010) ACI However, the mean value of the ratio V test /V pred is higher than the average for several procedures, especially for EC-2 and GP-4 equations, which generally offer the best predictions. This discrepancy could explain why the 4 beams discussed in Section 5.2.3 ( Figure 11) did not follow the general trend.…”

“…Twenty-six specimens were excluded from this figure because the transverse spacing of the longitudinal rebar is not given in the references; these specimens all originated from Diaz de Cossio (1962) and Leonhardt and Walther (1964). The stresses given in Figure 10 have been normalised by considering the influence of the concrete compressive strength on the shear strength, as given in EC-2 or in reference Pérez et al (2010). In next sections, the effect of the diameter and bar spacing of the longitudinal reinforcement as well as that of the bottom transverse reinforcement will be discussed.…”

“…They are the formulations given in Eurocode 2 (European Committee for Standardisation (CEN) 2002), Pérez et al (Pérez et al 2010, Pérez et al 2012 Any explicit partial safety factor given in the different design formulations has been removed when comparing the predictions with the experimental results, because the objective of this paper is not to carry out a safety calibration, but to study the general response of the presented methods in front of different experimental tests. Average values of the compressive strength have been used for all studied design formulations (f c in Table 1).…”

“…Thus, conclusions cannot be drawn. The equation GP4 was derived from the EC-2 shear formulation using a genetic programming algorithm (Pérez et al 2010). The beam and slab specimens from the same published database (Collins et al 2008) were used.…”

Modelling of upheaval buckling of offshore pipeline buried in clay soil using genetic programming

“…(e.g., optimisation of shear strength of reinforced concrete beams [19]; prediction of hardened properties of fresh self-compacting concrete containing pulverised fuel ash [25]; prediction of compressive strength of high performance concrete [6]; and optimal adjustment ofEC-2 shear formulation for concrete element without web reinforcement [20]). Azamathulla et al [1] have employed GEP for predicting bridge pier scour.…”