# Civil & Structural Design Basis, Equipment Loads & Cost Estimation Documentation

# 1. Executive Summary & Objective

The Civil & Structural Design Basis & Cost Estimation Calculator provides rigorous structural mechanics and capital budgeting models for multi-tier pharmaceutical and Active Pharmaceutical Ingredient (API) process synthesis blocks.

In chemical and pharmaceutical facility design, process structures are subject to unique, heavy industrial load combinations:

• Concentrated Static & Hydrotest Loads: Heavy glass-lined reactors (GLRs) and Hastelloy vessels filled with water for hydrostatic testing ($18 - 45\text{ MT}$ per bay).
• Dynamic Vibrating Unbalance: High-speed bottom-discharge centrifuges and Agitated Nutsche Filter Dryers (ANFDs) operating with dynamic magnification factors ($1.5\times - 2.0\times$).
• Severe Environmental & Chemical Corrosivity: Acid/solvent vapour exposure, demanding chemical-resistant epoxy/PU screed floor finishes, bunding containment dykes ($110\%$ spill volume), and cGMP hygiene.

This calculator couples IS 456:2000 / ACI 318-19 limit state axial design with quantitative Material Take-Off (MTO) benchmarks and turnkey Bill of Quantities (BoQ) capital budgeting.

# 2. Governing Engineering & Structural Equations

# 2.1 Limit State Factored Load Combinations (IS 875 / ACI 318)

The ultimate factored axial load ($P_u$) acting on the base of an interior column is summed across all building tiers:

Where:

• $DL$ (Dead Load): Concrete slab ($200\text{ mm} \times 25\text{ kN/m}^3 = 5.0\text{ kN/m}^2$), beams, columns, and screeds.
• $LL$ (Process Live Load): Imposed personnel and piping loads ($5.0 - 10.0\text{ kN/m}^2$).
• $EL$ (Equipment Hydrotest Load): Tare shell weight + full water fill ($W_{hydro} = W_{tare} + V \cdot \rho_{water}$).
• Dynamic Centrifuge allowance: $W_{dynamic} = W_{centrifuge} \times F_{dynamic}$ ($F_{dynamic} = 1.5 - 2.0$).

# 2.2 RCC Column Mechanical Sizing (IS 456 Cl. 39.3 / ACI 318)

For a short axially loaded column with minimum eccentricity allowance ($e_{min} \le 0.05 D$):

Where:

• $f_{ck}$ = Characteristic compressive strength of concrete ($25, 30, 35, 40\text{ N/mm}^2$)
• $f_y$ = Characteristic yield strength of reinforcement steel ($500\text{ N/mm}^2$ for Fe500D)
• $A_g$ = Gross cross-sectional area of the column ($B \times D\text{ mm}^2$)
• $A_{sc}$ = Total longitudinal steel area ($A_{sc} \ge 0.8\% A_g$, target $1.2\% - 2.0\%$)
• $A_c = A_g - A_{sc}$ = Net area of concrete

# 2.3 Slenderness Check

# 2.4 Geotechnical Foundation Sizing (Raft / Isolated Footings)

Where:

• $SBC$ = Safe Bearing Capacity of soil ($\text{kN/m}^2$)
• $P_{service}$ = Unfactored cumulative service load ($\text{kN}$)

# 3. Quantitative Material Take-Off (MTO) Benchmarks

For heavy multi-tier API synthesis blocks ($2,000 - 4,000\text{ m}^2$ Built-Up Area):

# 4. Turnkey Capital Cost Benchmark (BoQ)

• Substructure & Raft Foundation: $22.0\%$
• Superstructure RCC Framing: $37.8\%$
• Structural Steel Secondary Framing: $13.6\%$
• Masonry & External Plastering: $8.6\%$
• Chemical Epoxy/PU Flooring: $7.9\%$
• Cleanroom Finishes & Bunding: $5.3\%$
• Statutory, Architecture & Contingency: $4.8\%$
• Turnkey Benchmark Unit Rate: ₹3,400 – ₹3,800 / sq. ft BUA ($40 –$46 / sq. ft USD).