Project Information

Project Title

Project Location

Lead Civil Engineer

Client / Project Owner

Design Standard Code

Calculation Date

Structural Criteria & Design Basis

ACI 350-06 Code Standard: Explicitly covers environmental engineering concrete structures. Enforces sanitary crack control parameters via Durability Factor (S_d = 1.3), elevated minimum reinforcement ratios to restrict shrinkage cracking, and dynamic rebar spacing limits ($s_{max} = \min(3t, 300\text{ mm})$).

NSCP 2015 & ACI 318-14 Specifications: Governs flexural strength design, shear strength evaluation, capacity reduction factors (φ), and ultimate load combinations.

1. Geometric Parameters

Length (L) [m]

Width (B) [m]

Water Depth (h_w) [m]

Freeboard (FB) [m]

Computed Wall Height (H = h_w + FB): 3.50 m

Projection Ledge (L_ledge) [m]

Measured outward from outer tank wall face

Subjected to Flotation Check (High Groundwater)

Wall Profile Type

Wall Base Thk. (t_w,base) [mm]

Wall Top Thk. (t_w,top) [mm]

Base Slab Thk. (t_s) [mm]

Top Cover Slab?

Top Slab Thk. (t_top) [mm]

Soil Surcharge [kPa]

2. Material, Soil & Load Properties

Concrete f'c [MPa]

Steel fy [MPa]

Allow. Soil Bearing (q_allow) [kPa]

Soil Density [kN/m³]

Water Density [kN/m³]

Soil Ka (Active)

Main Rebar Dia. (φ) [mm]

Real-Time Structural Geometry Render

Dynamic CAD View

Elevation Cross Section (Wall & Cover)

Plan Cross Section (Top View)

Schematics update dynamically upon input parameter changes.

Analysis Results & Verification Checks

Summary of structural adequacy according to ACI 350-06 and NSCP 2015

PASS

Verification Criteria	Code Provision	Demand Value	Capacity Limit	Status	Recommended Action / Adjustment

Calculated Component Rebar Spacing Breakdown

Structural Part	Bar Diameter (φ)	Min. Required As (mm²/m)	Calculated Max Spacing	Design Selected Spacing	Provided As (mm²/m)	Difference (As,prov - As,req)

Flexural & Structural Mechanics

ACI 350 Durability, Soil & Flotation

RLN CENTERLINE ENGINEERING

Structural & Civil Engineering Calculations

Official Water Retaining Structure Design Report

CALCULATION SHEET

Date: --

Project: --

Location: --

Civil Engineer: --

Client: --

Design Codes: --

Tank Dimensions: --

1. Design Principles & Code Compliance

The structural design of this reinforced concrete liquid-retaining structure complies strictly with NSCP 2015 and ACI 350-06. Fluid loads are evaluated based on hydrostatic pressure profile. Durability parameters (S_d = 1.3) are incorporated to restrict flexural stresses under service conditions, limiting crack widths to ensure liquid tightness and rebar durability.

2. Applied Loads & Material Specifications

• Concrete Compressive Strength (f'c): -- MPa
• Steel Yield Strength (fy): -- MPa
• Unit Weight of Concrete: 24.0 kN/m³
• Fluid Density (Water): 9.81 kN/m³

• Allow. Soil Bearing Capacity (q_allow): -- kPa
• Soil Density (γ_s): -- kN/m³
• Active Soil Coeff (K_a): --
• Water Depth (h_w): -- m
• Freeboard (FB): -- m
• Base Projection Ledge (L_ledge): -- m

3. Structural Verification Summary

Criteria	Code Standard	Demand Value	Capacity Limit	Status

4. Individual Reinforcing Steel Bar Details & Sketches

A. Concrete Base Slab

B. Wall Cross Section

C. Top Cover Slab

D. Full Wall Elevation - Vertical Rebar Spacing & Transition Detail

5. Engineering Conclusion

The structural geometry and calculated rebar configurations satisfied all structural adequacy checks.

"This structural calculation report was generated using an engineering design aid developed by RLN Centerline Engineering. All computations are based solely on the input parameters provided by the user and the simplified structural methods described herein. This report does not constitute a sealed structural document unless signed and sealed by the Engineer of Record.

Pursuant to Republic Act No. 544, as amended by Republic Act No. 1582 (the Civil Engineering Law of the Philippines), and Presidential Decree No. 1096 (the National Building Code of the Philippines) and its Implementing Rules and Regulations, all structural plans and specifications submitted to the Office of the Building Official must be prepared, signed, and sealed by a duly licensed Professional Civil Engineer."

Prepared by:

ENGR. R. L. N., PE

Civil Engineer

PRC Registration No.: _____________________

PTR No. / Date Issued: ___________________

TIN / Place of Issue: ____________________

Affix Professional Civil Engineer Dry Seal Here

Generated by RLN Centerline Engineering | Standard Compliance: ACI 350-06 & NSCP 2015