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This paper presents an investigation on the efficiency of steel tubes in reinforcing self-compacting concrete (SCC) columns. A theoretical model is developed to study the axial behavior of SCC columns reinforced with steel tubes, considering the effects of confinement on the filled concrete by steel tubes and concrete core confined by spirals. The computational results are validated against the existing test results of SCC columns. The effects of various column parameters on the performance of SCC short columns under axial concentric loading are investigated. It is shown that the axial performance of SCC columns is influenced by the dimension and number of steel tubes, pitch of spirals, compressive strength of concrete, and yield stress of the steel tubes.
Composite-columnsFiber-analysisSelf-compacting-concreteHort-columnsSteel-tubeTo address concerns the two of us have there are things we do in a bipartisan basis on this committee. senator grassley and i have been concerned about the fbi s flawed hair and fiber analysis testimo testimony. i asked director comey a question in may. he promised me a follow-up. what are we doing going over the 3,000 cases that were closed because of faulty analysis by the fbi. if those cases come up, will you commit to having an agent conduct in-person visit to determine whether documents are necessary to find out what happened? i say this because i remember using the fbi s hair and fiber
House-judiciary-committeeThingsBasisFederal-bureau-of-investigationChairman-grassleyTwo-of-usTwoQuestionJim-comeyTestimonyMayAnalysisSo would you agree that citizenship alone is not a reliable indicator of a terrorist threat posed by an individual to the united states? correct. most of the people that i talked about that we have opens on are american citizens. in fact the department of homeland security we ve heard from them, they have an assessment from the office of intelligence analysis concluded that citizenship is unlikely to be a reliable indicator of potential terrorist activity. do you agree with that? yes. thank you. another matter, chairman grassley and i have worked to address the concerns related to the fbi s hair, fiber analysis testimony has been flawed i think we all accept in the past. investigation began i believe
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