Bridge Design Suite

IRC Bridge Structural Design Suite IRC:112 & IRC:6

Integrated Superstructure, Substructure & Foundation Design Engine

ALL MEMBERS SAFE (IRC 112 COMPLIANT)

PASS

Max Utilization Ratio: 0.78 in Pier Biaxial Interaction under ULS Combination #12.

Span / Clearance

24.0 m

Gov. ULS $M_{u}$ Girder

4280.5 kNm

Gov. Pier $P_u$

8950 kN

Max Pile Reaction

1420.5 kN

Superstructure Dimensions & Deck Setup

IRC 5 Cl. 108

Bridge Span $L$ (m)

Carriageway $B_{cw}$ (m)

Total Width $B_{deck}$ (m)

Deck Slab $t_s$ (m)

No. of Main Girders

Girder Depth $D_g$ (m)

Girder Web $b_w$ (m)

Wearing Coat $t_{wc}$ (mm)

Crash Barrier (kN/m/side)

Substructure & Pier Cap Parameters

IRC 112 Cl. 8

Pier Cap Width $B_{cap}$ (m)

Pier Cap Length $L_{cap}$ (m)

Pier Cap Depth $D_{cap}$ (m)

Pier Shape Rectangular Column Circular Column

Pier Width / Dia $b_p$ (m)

Pier Depth $d_p$ (m)

Pier Height $H_p$ (m)

Concrete Grade M35 ($f_{ck}=35$) M40 ($f_{ck}=40$) M45 ($f_{ck}=45$) M50 ($f_{ck}=50$)

Steel Grade Fe 500D Fe 550D

Foundation Type & Geometry

IRC 78

Foundation Type Bored Cast-in-Situ Piles Open Spread Footing

No. of Piles ($N_p$)

Pile Dia $D_p$ (m)

Cap Width $B_{ftg}$ (m)

Cap Length $L_{ftg}$ (m)

Cap Thickness $D_{ftg}$ (m)

Superstructure Deck Cross-Section Live Scaled Canvas

Substructure & Foundation Layout Elevation

IRC 6 Vehicle Configuration

IRC 6 Annex B

Primary Live Load Class 2 Lanes of IRC Class A (40t train) 1 Lane Class 70R (Wheeled 100t) + 1 Lane Class A 1 Lane Class 70R (Tracked 70t) Special Vehicle SV-385 (385t Heavy Axle)

Kerb Clearance $c$ (m)

Impact Factor Multiplier

IRC 6 Clause 208 Impact Provision:

For RCC bridges, Impact Factor $I = \frac{4.5}{6 + L} = 1.15$ for Class A wheeled vehicles on 24m span.

Environmental & Hydrodynamic Actions

Wind Speed $V_b$ (m/s)

Water Speed $V_w$ (m/s)

Seismic Zone Factor $Z$ Zone II (Z=0.10) Zone III (Z=0.16) Zone IV (Z=0.24) Zone V (Z=0.36)

Response Red. $R$

Active Vehicle Axle Spacing & Axle Loads Class 70R Wheeled

Mid-Span Bending Moment Influence Line ($ILD$) Max Governing Position

IRC 6 Table 3.1 Load Combinations & Action Matrices

Includes all 24 orthogonal seismic permutations and vehicle placements.

IRC 6:2017 & IRC 112:2020

Limit State / Combination	Primary Action Vector	$P_u$ (kN)	$M_{uL}$ (kNm)	$M_{uT}$ (kNm)	$V_{u}$ (kN)	Status

Deck Slab Transverse Design (IRC 112 Cl. 8) PASS

ULS Design Moment $M_{sd}$

42.5 kNm/m

Req. Rebar $A_{s,req}$

680 mm²/m

Provided Rebar

T12 @ 120 c/c

Main Longitudinal Girder Design PASS

ULS Flexure $M_{u}$

4280.5 kNm

Moment Cap. $M_{Rd}$

5120.0 kNm

ULS Shear $V_u$

720.4 kN

Shear Stirrups

4L-T12 @ 150 c/c

Pier Column Biaxial Interaction (IRC 112 Cl. 8.3) PASS

Axial Cap. $P_{uz}$

32450 kN

Cap. $M_{uL1}$

2850 kNm

Cap. $M_{uT1}$

3120 kNm

Biaxial Ratio $IR$

0.782

Foundation & Pile Reaction Check (IRC 78) PASS

Max Pile $P_{max}$

1420.5 kN

Min Pile $P_{min}$

620.1 kN

Allowable Pile Cap

1800.0 kN

Pile Safety Factor

1.27 OK

IRC 112 Pier $M_{uL}-M_{uT}$ Interaction Surface ULS Surface

Bridge Structural Design Calculation Sheet

IRC:5, IRC:6:2017, IRC:112:2020 & IRC:SP:105 Standards

Date: 2026-09-11

Status: PASS (SAFE)

1. Geometry & Materials

Bridge Span:24.0 m

Deck Width:10.5 m

Concrete / Steel:M40 / Fe500D

Pier Height / Dim:8.0m / 2.0x1.2m

2. Critical Loads & Actions

Live Load Class:Class 70R Wheeled

Gov. Girder Moment:4280.5 kNm

Gov. Pier Axial Force:8950.0 kN

Biaxial Interaction Ratio:0.782 <= 1.0

Bridge Component	Governing Demand	Section Capacity	Utilization	Result
Deck Slab (Transverse)	$M_{sd} = 42.5\text{ kNm/m}$	$M_{Rd} = 58.2\text{ kNm/m}$	0.73	PASS
Main Girder (Flexure)	$M_u = 4280.5\text{ kNm}$	$M_{Rd} = 5120.0\text{ kNm}$	0.83	PASS
Pier Column (Biaxial)	$M_{uL}=810, M_{uT}=2467$	IRC 112 Ellipse Eq.	0.78	PASS
Pile Foundation	$P_{max} = 1420.5\text{ kN}$	$P_{allow} = 1800.0\text{ kN}$	0.79	PASS

Generated by IRC Bridge Engineering Design Suite Verified against IRC:5, IRC:6, IRC:112 & IRC:SP:105