Chloride induced corrosion of steel reinforcement is the main cause of deterioration of reinforced concrete marine structures. This paper investigates the relative performance of alternative repair options with respect to the deterioration of reinforced concrete bridge elements in marine environments. Focus is placed on the initiation phase of reinforcement corrosion. A laboratory study is desc...

Concrete cylinder piles produced by a centrifugally cast, vibrated, roller-compacted process have shown promising corrosion resistance in marine environments. Three bridges in the Florida panhandle with ~40 years in aggressive marine service and one newly constructed marine bridge utilizing concrete cylinder piles were examined. Examination of the older marine bridges showed minimal corrosion d...

To solve the problem that repair material of bridge's expansion joint anchorage area is prone to debonding from other bridge components, polyurethane concrete was designed and prepared, bonding performance tested by bond splitting test, direct shear oblique steel reinforcement pull-out test. The results show interfacial strength cement can be improved increasing roughness. increases up 91.4%, 5...

Reinforcement learning (RL) refers to a wide range of dierent learning algorithms for improving a behavioral policy on the basis of numerical reward signals that serve as feedback. In its basic form, reinforcement learning bears striking resemblance to ‘operant conditioning’ in psychology and animal learning: actions that are rewarded tend to occur more frequently; actions that are punished ar...

Past earthquakes have demonstrated that old RC bridges may be seismically vulnerable. Bridge responses during the last decades illustrated the necessity of the seismic assessment of bridges especially those which were designed with old codes. In this research an existing concrete bridge representative of the most common bridges in the highway system in Iran are studied. Push over and nonlinear ...

This paper presents an experimental study on the monotonic and fatigue behavior of a link slab designed for a durable concrete bridge deck system. The requirements on the link slab in terms of material properties, dimensions, and reinforcement detailing are considered. Special focus is placed on the deflection capacity of the link slab and its fatigue performance. This paper discusses the choic...

The portal structure is the support equipment in catenary, which bears load of contact suspension and equipment. In practical work, with change external forces, complex changeable loads, so it has higher requirements for its reliability safety. order to study dynamic characteristics catenary on continuous beam four-way bridge, taking Dshaping bridge as research object, simulation model bridge-n...

A reinforced concrete member in which the total span or shear span is especially small in relation to its depth is called a deep beam. In this study, a new approach based on the Adaptive Neural Fuzzy Inference System (ANFIS) is used to predict the shear strength of reinforced concrete (RC) deep beams. A constitutive relationship was obtained correlating the ultimate load with seven mechanical a...