which are analyzed through three aspects: the cross-sectional dimension of the beam, the longitudinal reinforced bar, and the longitudinal reinforcement bar. What are the structural requirements of the beam? 1 section size height ratio of rectangular cross-section beam h / b generally take 2.0 ~ 3.5; T section beam aspect ratio h / b generally take 2.5 ~ 4.0 (b also beam rib width). In order to unify the template size for easy construction, the beam cross-sectional
width is usually taken as b = 120mm, 150mm, 180mm, 200mm, 220mm, 250mm, 300mm, 350mm and other dimensions; beam section height is usually taken as h = 250mm, 300mm, 350mm, ... ... 750mm, 800mm, 900mm, 1000mm and other dimensions. 2. Longitudinal force commonly used in reinforced longitudinal beams tendons diameter of 10mm ~ 28mm When the beam height h �� 300mm, not less than 10mm root number of not less than two,
respectively, arranged in the cross section, the lower corner so that Tie with stirrups to form a skeleton. The diameter of the reinforced bar in the beam should be as same as possible. When using two different diameters of steel, then the bar should be at least the difference between the diameter of 2mm, in order to identify with the naked eye during construction. 3. Longitudinal structure of steel For single-section beam, the beam in the pressure zone but also set up
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