Civil Engineering Structure Discussion Area ----【Daily Question】Question from the 20151109 issue
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True or False: If the longitudinal tensile reinforcement in a beam is arranged in two rows, it is called a double-reinforced beam ( ). Answer: False
If the longitudinal tensile steel bars in a beam are arranged in two rows, it is called a double-reinforced beam (Incorrect)
A beam in which the longitudinal tension bars are arranged in two rows is called a double-bar beam (X)
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If the longitudinal tensile steel bars in a beam are arranged in two rows, it is called a double-reinforced beam (Incorrect)
If the longitudinal tensile steel bars in a beam are arranged in two rows, it is called a double-reinforced beam (Incorrect)
If the longitudinal tension reinforcement in a beam is arranged in two rows, it is called a double-reinforced beam ( ) False. “Double-reinforced” and “single-reinforced” refer mainly to the reinforcement present in the beam. In the calculation of beams, when the load is not high, the stress (pressure) in the compressed zone is mainly borne by the concrete, while the stress (tension) in the tensile zone is borne by the steel bars. At this point, it is sufficient to arrange stress-bearing rebars in the tensile zone, while structural rebars (provisional rebars) are used in the compressive zone; in calculations, these provisional rebars do not bear any stress. Beams with such a reinforcement arrangement are called \"single-rebar beams\". When the load is high and the concrete in the compressed zone of the beam is not sufficient to withstand the compressive stress, some steel bars must also be placed in that compressed zone to share the compressive stress together with the concrete; such steel bars are known as stress-bearing steel bars in the compressed zone. To achieve balance, in the tension zone, in addition to the tension steel bars corresponding to the concrete in the compression zone, tension steel bars with an area equal to that of the compression steel bars in the compression zone must also be added. A beam that has reinforcing bars in both the tensile and compressive zones is called a \"double-reinforced beam\". In practical engineering, \"single-reinforced beams\" are widely used, but some beams that are subject to bending in two directions – those for which it is difficult to determine whether the load acts upward or downward (such as foundation beams) – are also reinforced with double rebar.
If the longitudinal tensile steel bars in a beam are arranged in two rows, it is called a double-reinforced beam (Incorrect)
A beam whose longitudinal tensile reinforcement is arranged in two rows is called a double-reinforced beam. ( Wrong )