A Treatise On The Principles And Practice Of Harbour Engineering

PILING. 83 Coefficients in Gokdon’s Formula. Material. Cross Section. Values of a. Both ends rounded. Both ends fixed. One end rounded, one fixed. Timber. Rectangular or circular . ih fin Tin Wrought iron Rectangular . . 1 Circular (solid or hollow) f 2/07 îïw TAVS LT+D=Ii_l 1175 nin aH Cast iron Circular (solid) 100 TH yin ,, (hollow) . Rectangular . liin Ain nin 3 innn ATA Reinforced [ Cross-shaped . . . vis 3 nnn siv Circular (solid). SOIT ’Ao ishi concrete ( Rectangular (solid) TSÏ non TAT In the case of compound columns of concrete and steel (reinforced conerete), it is necessary to find the equivalent sectional area in terms of one material and make the ensuing calculations on that basis. Thus, if p be the ratio of the E coefficient of elasticity of steel to that of concrete, that is, if p=^ , then an area A of steel is equivalent in resistance to an area pA of concrete. If A is the area of a reinforced concrete section (including the area of the steel re- inforcement), and A, is the area of the steel, then the equivalent section A( in simple concrete will be Ac= A+(p - l)Aa. The strength of a reinforced concrete pile can therefore be determined by treating it as a simple concrete pile of augmented area, the equivalent area being determined as above. The value of d in the table corresponds to this method of treatment. The value of p may be taken as 15".