1. Determine whether the following statements are true or false. 1) (TF) When using post-tensioned tendons, the prestressing force in the concrete is primarily transferred through bond and friction along the strands. 2) (TF) In prestressed concrete, any loss of prestressing force is not allowed. 3) (T/F) Columns with larger eccentricities primarily fail due to the crushing of concrete. 4) (TF) If a beam satisfies the strength limit state, checking the serviceability limit state is unnecessary. 5) (TF) The primary purpose of prestressed concrete design is to control cracking and deflections. 6) (T/F) Prestressing results in compressive forces within the concrete. 7) (TF) In prestressed concrete, lower concrete strength is permitted compared to typical reinforced concrete because tendons can carry higher stresses than conventional reinforcement bars. 8) (TF) If the factored torsion is less than the threshold torsion, torsion does not need to be considered in the design. 9) (TF) Hooked bars require a shorter development length compared to straight bars. 10) (TF) Similar to shear, torsional effects must be evaluated at the critical section. 11) (TF) The distinction between pre-tensioning and post-tensioning arises from the tendon profile, whether straight or curved. 12) (TF) Unlike shear reinforcement, torsional reinforcement must extend along the entire length of the beam. 13) (TF) A column's bending moment capacity can be significantly increased by reducing its axial load. 14) (TF) If the combined shear and torsional stress exceeds permissible limits, increasing the beam's dimensions is required. 15) (TF) Variations in the strength reduction factor (6) suggest that tied columns are more reliable than spirally reinforced columns.

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.7P: Estimate the transverse tensile strength of the concrete in Problem 12.6.

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Transcribed Image Text:1. Determine whether the following statements are true or false. 1) (TF) When using post-tensioned tendons, the prestressing force in the concrete is primarily transferred through bond and friction along the strands. 2) (TF) In prestressed concrete, any loss of prestressing force is not allowed. 3) (T/F) Columns with larger eccentricities primarily fail due to the crushing of concrete. 4) (TF) If a beam satisfies the strength limit state, checking the serviceability limit state is unnecessary. 5) (TF) The primary purpose of prestressed concrete design is to control cracking and deflections. 6) (T/F) Prestressing results in compressive forces within the concrete. 7) (TF) In prestressed concrete, lower concrete strength is permitted compared to typical reinforced concrete because tendons can carry higher stresses than conventional reinforcement bars. 8) (TF) If the factored torsion is less than the threshold torsion, torsion does not need to be considered in the design. 9) (TF) Hooked bars require a shorter development length compared to straight bars. 10) (TF) Similar to shear, torsional effects must be evaluated at the critical section. 11) (TF) The distinction between pre-tensioning and post-tensioning arises from the tendon profile, whether straight or curved. 12) (TF) Unlike shear reinforcement, torsional reinforcement must extend along the entire length of the beam. 13) (TF) A column's bending moment capacity can be significantly increased by reducing its axial load. 14) (TF) If the combined shear and torsional stress exceeds permissible limits, increasing the beam's dimensions is required. 15) (TF) Variations in the strength reduction factor (6) suggest that tied columns are more reliable than spirally reinforced columns.

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