Steel vs Concrete ToolĮnter your wall dimensions and the values below will adjust automatically.Shoichi KITAJIMA,Shohei KISHI,Kenichi FURUHATAĭesign Standard Division Design Standard Section Only in special cases when deflection is of critical concern should the Moment of Inertia be considered independently. Moment of Inertia is NOT typically a stand-alone design criteria. Moment of Inertia is essentially the stiffness of the sheet piling section and is the initial property required to calculate the section modulus of a given profile. Particular steel sections should not be specified as they have a certain design moment resisting capacity and it should be up to the contractor or engineer to choose a steel piling section that most safely and efficiently meets the specified design moment criteria.ĭo not confuse “Design Moment” with “Moment of Inertia:” Design Moment would be considered equivalent. Then, any hot-rolled steel piling section meeting the required 75.8 k-in./ft. Please note that it would be incorrect to say, “We have specified a particular sheet piling section however, any equivalent hot-rolled sheet piling section may be considered.” The reason this would wrong is the following: say the steel sheet piling section has a section modulus of 33.5 in 3/ft - by not stating the minimal section modulus needed (30 in 3/ft) you would not give the correct information to those who are bidding the project.Ī) Design Moment For example, say in a section of plans which has 500 feet (~152 m) of wall length and a sheet-piling length of 48 feet (14.6 m), you require a minimum design moment of 75.8 k-in./ft (~28 KN-m/m). Please note that any steel wall type meeting the required 30 in 3/ft minimum section modulus (assuming the same grade of steel) would be considered as an acceptable alternative. In order to secure the most efficient steel piling solution for your structural design needs, we suggest that you clearly state valid 'strength parameter.” For most applications, either of the following examples should be used:ġ) Specify Via Section Modulus and Steel GradeĪ) Section Modulus For example, say in a section of plans which has a 500 foot (~152 m) length of wall and a sheet-piling length of 48 feet (~14.6 m), you require a minimum section modulus of 30 in 3/ft (~150 cm 3/m). Here are two examples of how your engineer may want to properly specify steel sheet piling: To simply pick a specific steel section and use the attributes of this piece of steel as the design parameters for the project will limit the options of the bidders and result in a much higher cost to the owner. In order to secure a competitive bid for the sheet piling portion of your job, you must ensure that your design engineer properly outlines the strength parameters of the job and the required design life.

Sheet pile wall calculator