The impact loading condition (488 J impact energy), including the autofrettage pressure (107 MPa) and service pressure (70 MPa), was successfully imposed on the finite element model of the pressure vessel.
(5) A summary table was proposed, which can be used to easily check whether the net tensile stress (Δf ps ) exceeds the specified stress limit (250 or 350 MPa) under the service loads using only the magnitude of the effective prestress (f se ), requiring no complex cracked section analysis, and it can be thus easily applied in practice.
A summary table was proposed, which can be used to easily check whether the net tensile stress (Δf ps ) exceeds the specified stress limit (250 or 350 MPa) under the service loads using only the magnitude of the effective prestress (f se ), requiring no complex cracked section analysis, and it can be thus easily applied in practice.
On the other hand, a summary table was also proposed, which can be used to easily check whether the net tensile stress (Δf ps ) exceeds the specified stress limit (250 or 350 MPa) under the service loads using only the magnitude of the effective prestress (f se ) without calculating the net tensile stress of the prestressing strands (Δf ps ).
The experimental results proved that the tensile strength of the novel neutron-absorbing material was between 195 and 346 MPa and the maximum service temperature was up to 300 °C.
Since the design of an RC member for serviceability assumes that the stress of the reinforcement is in the linearly elastic range, Eq. (2) can be revised to Eq. (5), where f s denotes the reinforcement stress under the service-level loading (MPa) and E s is the elasticity modulus of reinforcement (MPa).
As aforementioned, in the partial PSC members (PPR ≥ 50%) with the effective prestress (f se ) greater than 0.50 f pu, the maximum allowable stress of the prestressing strand at the service load (Δfps,allow) is 250 MPa if 420 MPa nonprestressed steel is used, while it is 350 MPa if 550 MPa nonprestressed steel is used.
Therefore, to prevent premature fatigue induced failures, avoiding corrosion in Grade 500 MPa steel rebar during the structural service period is crucial.
The data shown in Fig. 7 clearly show that at rational service load levels (f s < 496 MPa 72 ksi), average crack widths are all below the present AASHTO de facto limit of 0.43 mm (0.017 in).. Indeed, with the exception of beam F2, maximum crack widths also fall below this threshold through bar stresses of 496 MPa (72 ksi).
Also superimposed on this figure are expected service load stress levels 248, 414, and 496 MPa (36, 60, and 72 ksi), corresponding to 0.60fy for 414, 690, and 827 MPa (60, 100, and 120 ksi) reinforcing steel, respectively.
