Road & Bridge Design Suite

1What the suite does

The suite brings the calculations of a road and bridge project together in a single project — from cumulative traffic and pavement thickness to bridge girders, piers, pile foundations and construction cost. Every module uses the same project data set, so when you change a value anywhere, the whole report recalculates instantly. There is no re-keying and no Calculate button.

2Permissions and data storage

This page uses the same permission rules as CPM Planner and ERP Studio: anyone can view, but editing is reserved for approved members

Where is the data stored?

• Stored in your account — like ERP Studio and CPM Planner · When you sign in with an account that has edit rights, all projects are synced to your account automatically, so you see the same set on any computer or phone
• Automatic saving — every time you change a value, the system saves it on the device immediately and then uploads it to your account about 1–2 seconds later. There is no Save button to press
• Check the status on the badge in the top bar — Synced to your account HH:MM means the upload is done · Saved on this device only means you are not signed in · If the connection has problems you will see Cloud sync failed — saved locally, and the data is uploaded automatically once you are back online · Could not read your account — not synced means the data in your account could not be read; the system will not touch the data on either side until it can be read · Could not save on this device — storage full means the browser storage is full; export your work, then clear old website data first
• Works without signing in — projects stay in the browser on that device. The first time you sign in with an account that has no projects yet, the system pushes the local projects up as the first set
• Both sides are merged, not overwritten — when the page opens, the system compares local projects with those in your account one project at a time. The one edited later wins, and projects that exist on only one side are kept on both. Work that has not yet been synced is therefore never overwritten by older data
• Automatic local backup — before deleting a project, before restoring, and before merging local data with your account, the system backs up the project list, keeping the 5 most recent sets · Restore from the Project Settings page → Restore projects from local backup. Whatever is on the device at that moment is always backed up as another set before restoring
• Move devices with a JSON file — still works as before. On the Project Settings page, click Export project (JSON), then use Import project (JSON) with that file on the destination device. Good for keeping your own backups

Confirmation pop-ups before deleting or overwriting

Every button that causes data to be lost or replaced always shows an “Are you sure you want to…” pop-up first. The pop-up shows the item name, its number and how many items will actually be lost. Read it before clicking — there is no undo after you confirm.

Buttons that ask first: delete project · delete design alternative · delete team note · delete a row in an input table · load a design alternative (the values you are editing are replaced) · restore projects from local backup

3Tour of the 4 screens

The left sidebar has two parts — Overview (3 menus) and Calculation Modules (27 modules in 6 groups) · The number after each module name is that module's D/C ratio, and the colored dot before the name shows pass/fail status

Top bar

4Set up the project first

This information appears on the letterhead and signature blocks of the calculation report. Fill it in completely from the start so you do not have to fix the whole report later

1. Open the Project Settings page

   Click the Project Settings menu in the left sidebar

2. Enter document details and responsible persons
   • Project name and Document no. — appear in the header of every page
   • Company / Organisation and Letterhead sub-line, such as the name of the responsible division
   • Document status — draft, awaiting review, checked, approved, or on hold
   • Designed by · Checked by · Certifying engineer, each with their Council of Engineers (COE) license number
3. Add company details and logo

   Click the user card at the bottom of the left sidebar to open the Edit user profile window — enter your name, position, company name, address and tax ID, and upload a logo for the letterhead

4. Choose your preferred units

   Set once and it applies to every module — see section 6 · Units and data entry

5All 27 calculation modules

Choose a module from the left sidebar. Groups you are not using can be left at their default values without affecting other groups · The Expand all button at the end of the “Calculation Modules” heading expands or collapses all groups at once

Group 1 · Roadway (5 modules)

Group 2 · Bridge — Superstructure (6 modules)

Group 3 · Bridge — Substructure (7 modules)

Group 4 · Extreme Events (2 modules)

Group 5 · Foundations (6 modules)

Group 6 · Quantities & Cost (1 module)

6Units and data entry

The Length and Force buttons on the top bar set the units for the whole suite. You can change them at any time; values already entered are converted automatically, so there is no need to re-enter them

• The defaults are meters and kilonewtons, matching the units used by AASHTO LRFD
• Values are always stored internally in base units, so switching units only affects the display and never distorts the results
• Your chosen units are remembered — the next time you open the suite, you get the same units
• Fields with a caption below the name explain what value to enter, such as the range recommended by the standard

7Standard pile sections

The pile modules include a catalog of 23 Thai standard sections in 4 families. Once you pick one, the suite fills in the size, section shape, concrete strength and safe load capacity automatically

8Reading the results

Demand/capacity ratio D/C

D/C is the actual force (Demand) divided by the strength the section can resist (Capacity) — a single number that tells you how “tight” the design is

Parts of a module page

Dashboard

• Demand/capacity ratio bars sorted from highest to lowest — always look at the top line first; that is the critical point of the design
• Failing Checks gathers every ✗ in one place; click to jump straight to the source module and fix it
• The four figures at the top — number of modules, number of passing checks, maximum ratio found, and total estimated cost

9Comparing design alternatives

When you need to choose between “a deeper girder with fewer piles” and “a shallower girder with more piles”, save both designs and compare the figures

1. Finish the first design

   Enter values until you are satisfied, then note the D/C and cost

2. Save it as an alternative

   Go to Project Settings and click Save current values as an alternative

3. Change the values for the second design

   Change the values you want to try, then save as an alternative again

4. Compare on the dashboard

   The Compare Design Alternatives table shows every alternative with its number of passing checks, maximum ratio and cost · Click Load to bring that alternative back as the current values

10Working with multiple projects

The All Projects page shows every project saved on this device as a card · The card with an orange bar is the project currently open

11Calculation reports and files

What the calculation report contains

• Letterhead with logo, company name, project name, document number and status
• Input data, calculation results and checks for every module
• Step-by-step formulas and substitutions, with section drawings
• Signature blocks for the designer, checker and certifying engineer, with their COE license numbers

12Engineering cautions

• Soil data must come from actual site investigation — pile capacity and settlement are very sensitive to soil parameters; guessed values cannot be used for construction decisions
• The laterally loaded pile module is an approximate method — use it only for preliminary checks. Real projects where lateral load governs should be analyzed with the p-y method
• Blow counts from dynamic formulas have high uncertainty — confirm them by testing, such as a Dynamic Load Test or Static Load Test, as required by the project specifications
• The estimated cost is a preliminary figure — it is based on the reference price list and Factor F and does not yet include site-specific conditions, transport costs or special operating costs
• The vehicle load a rigid pavement can carry is a check of slab strength at the slab edge only — it does not yet include joints, dowel bars, the subbase, or fatigue from the actual number of passes · The gross weight limits entered are defaults per the Notification of the Director of National Highways (DOH), B.E. 2548, as amended up to No. 8, B.E. 2558 (last checked Sep 2569). Vehicles with 6 or more axles depend on the king pin distance. Compare against the version currently in force and the conditions of the road-owning agency before using the result to answer an owner
• Check the units before every submission — switch units and read the values again once to avoid reading results at the wrong scale

Check before submitting

• No items left in the “Failing Checks” box
• Project name, document number and document status match what you are actually submitting
• Names and COE license numbers of the designer, checker and certifying engineer are complete
• Export a JSON copy to keep alongside the PDF you submit

13Frequently asked questions

14Glossary of terms