I have been analyzing a reinforced concrete t-beam bridge to be replaced. Half of superstructure will be removed and other half will remain for 6 months while first half is replaced. Then this half will be replaced. This bridge was completed in 1951 with concrete strength 3 ksi and rebar Fy= 40 ksi. I have modelled this entire half and added the barrier at cut section of deck. The consultant is requiring me to put the HL93 truck on it plus the 10 feet wide lane load of 640 kips/ft plus an extreme event lateral load of TL-1 on the temporary barrier that is approved by the DOT and is bolted down to existing reinforced concrete deck. These are new rules for AASHTO LRFD design of new bridges not for a temporary 1/2 existing bridge to be removed 6 months from now. Are these new rules to be applied for old temporary bridges?
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