4.1 Bending behavior of concrete structural members 4.2 T-sectional beam and shear lag 4.3 Ductility of structural members 4.4 Mechanical behavior of reinforced concrete members under axial compression 4.5 Mechanical behavior of reinforced concrete members under moment and compression 4.6 Mechanical behavior of slender columns
1858 ~ 1861, Kekulé, Couper, and Butlerov, laid the basis for one of the most fundamental theories in chemistry: the structural theory. Valence(化合价): C — tetravalent; O — divalent; H — monovalent