Section Modulus Of Steel Sheet Pile

The strength of sheet piling to resist bending is a combination of the shape of the section and the material out of which it is made.

Section modulus of steel sheet pile.

The major difference is that i moment of inertia is used for more general calculations. Therefore the required section modulus is 312 in 3 ft using s430 gp. When calculating the stress in a steel pile for example the formula using i is. Nz pz hot rolled steel sheet pile section width w in mm height h in mm thickness cross sectional area in 2 ft cm2 m weight section modulus moment of inertia in4 ft cm4 m coating area flange tf in mm web tw in mm single pile lb ft kg m wall area lb ft2 kg m2 elastic in3 ft cm3 m plastic in3 ft cm3 m.

Z type sheet piles are the preferred choice for permanent applications. Pz ps hot rolled steel sheet pile section width w in mm web tw in mm maximum interlock strength k in kn m minimum cell diameter ft m cross sectional area in2 ft cm 2 m weight elastic section modulus in3 sheet cm3 sheet moment of inertia in4 sheet cm4 sheet coating area pile lb ft kg m wall lb ft2 kg m2 both sides ft2 ft. Among the essential characteristics of z shaped sheet piles are the continuous form of the web and the specific location of the interlock symmetrically on both sides of the neutral axis. The plastic section modulus can be up to 25 higher than the elastic section modulus which leads to a significant reduction of the overall cost lighter sheet piles.

For instance for u piles a reduction of the section modulus and of the moment of inertia may have to be considered. Section modulus 650 k ft ft x 12 in ft 31 2 k in 2 therefore the required section modulus is 250 in 3 ft the us army corps of engineers design of sheet pile walls engineer manual from 1994 recommends accounting for a safety factor for the allowable bending stress of 50 50. Ec 3 5 considers both plastic as well as elastic sections modulus w pl or w el which depend on the classification of the section. These two attributes have a positive influence on the section modulus.

Having the interlocks located at the outer fibers of the wall assures the designer of their published section modulus. Additional applications also include load bearing bridge abutments. Stress m y i. The allowable stress of the material is a function of the material itself.

Z piles are commonly used for cantilevered tied back king pile and combi wall retaining systems. Z sections are considered one of the most efficient piles available today. Both the allowable bending moment and the section modulus are specified as per lineal foot or meter of wall.