TBWALL – COMPLETE DESIGN OF MULTILEVEL TIEBACK WALLS, (SI Units + English Units).
SoilStructure TBWALL, is for multilevl tied back retaining wall design. Spreadsheets are hard to preserve and it is time consuming to do all the stability and design checks using in house tools. This anchored shoring wall software gives you pleasure and ease when analyzing tied back retaining structures. When excavation cuts exceed 17 feet, the required section modulus of the soldier beam becomes increasingly large. It is therefore more economical to use a tieback wall soldier beam system.
The most popular and most efficient method of designing tieback walls is the method proposed by Blum, later modified by Tschebotarioff and others. This is known as the equivalent beam method which is a special case of the fixed earth support method & is also very close to the elastic line method.
TBWall Software does not use Navfac method, nor FHWA method nor Caltrans method. It uses limit equilibrium method and yields the lightest beam possible that meets stability. Therefore, soils parameters and shoring geometry kept equal, TBWall Software yields Approx. 30 pounds lighter beam on a 30 ft cut. In addition, it gives approx. 20% shallower embedment depth than the methods mentioned above. That is why professional shoring engineers & Design-Build Contractors use TBWall Shoring Software.
TBWall software can handle up to 4 levels of tiebacks or approximately 55 ft deep excavation.(95% of the cases). This software allows you to enter the earth pressure loading, the tieback support levels, the beam shape (drop down menu), and tieback inclination. Other software stop here. However, TBWall also allows to enter vertical loading (axially loaded member check) & Lateral Torsional buckling check (LTB). Also a check is made for adequacy in Shear, Bending and Deflection. The charts have vertical orientation, just like the soldier pile and consist of loading, shear, moment, slope and deflection diagrams.
You may use either ENGLISH UNITS, in which case only compact sections of AISC W shaped beams would be displayed or SI UNITS, in which case metric beams and properties are shown. The program uses ASD approach, which is current state of practice.
Below is SoilStructure Software Solution of a 50 ft Tieback Wall from Chapter 2 of “Simplified Procedures for the Design of Tall, Flexible Anchored Tieback Walls” Ebeling, Azene & Strom, 2002. The only difference is we used T & P Apparent Earth Pressure Loading of 0.65*Ka*Y*H. We first check the Cantilever position assuming a 2 ft excavation below Anchor 1. Then we move down with excavation to next tieback level. A 4 level tieback yields 5 construction stages. You will notice the largest Anchor Force for Tieback #1, Tieback #2 & Tieback #4 are at Stage 5, however, Tieback #3 Anchor Force is greatest at Construction Stage 4. You will notice that a 3 level and 2 level tiebacks may have different outcome. So check all Construction Stages for each Tieback Wall Design.
|50 FT TB STAGE 1 CANTILEVER||
|50 FT TB STAGE 4 50 FT TB STAGE 5 FINAL|