ATIR STRAP and BeamD provide powerful automated workflows for analyzing cracked concrete sections.
In structural engineering, actual concrete deflections and stress distributions are much greater than linear elastic calculations suggest. This is due to cracking, reinforcement ratios, and time-dependent factors like creep and shrinkage.
This guide outlines how to calculate crack widths, account for cracked sections in your analysis, and use the BeamD module to detail your repairs according to international codes like Eurocode 2 or ACI 318. 🛠️ Phase 1: Analyzing the Cracked Section in STRAP
Before jumping straight into reinforcement, you must calculate the reduced stiffness of the cracked concrete to understand the true behavior of the structure.
Set Up Load CombinationsTo properly analyze a cracked beam or slab, you must create at least three separate load combinations in the Results module:
Ultimate Loads (Total): To calculate the required reinforcement. Service Loads (Total): To calculate immediate deflection ( ) taking initial cracking into account.
Service Loads (Sustained): To calculate long-term deflections caused by creep. Calculate the Effective Moment of Inertia ( Iecap I sub e
)STRAP utilizes an empirical approach (like the Branson method) to solve for a reduced stiffness value based on the ratio of the actual service moment ( ) to the cracking moment ( Mcrcap M sub c r end-sub
Navigate to the side menu and select Cracked Section & Long Term Deflections.
Input the specific code parameters (e.g., Eurocode 2 or ACI 318) and specify your material properties.
Click Solve. STRAP will recalculate the model using the reduced stiffness of the cracked elements. Check Crack Width Limits
Under the concrete design options, calculate the theoretical crack widths.
Ensure that the computed crack widths do not exceed code-specified limits (typically for standard exposure). 🏗️ Phase 2: Designing the Fix with BeamD
Once STRAP has completed the complex Finite Element (FE) analysis, you can export the isolated cracked beam into BeamD—ATIR's specialized 2D continuous beam design and detailing module. Automatic Beam Definition
If not already done, you can use the automatic search feature. BeamD will automatically define spans and locate support widths by searching for perpendicular elements.
Adjusting the Reinforcement to "Fix" the CrackTo safely address areas experiencing heavy cracking, you must manually adjust or optimize the steel parameters:
Increase Tension Steel: Go to the reinforcement editing menu and increase the number or diameter of the bottom/top bars at the high-moment locations indicated by your analysis.
Reduce Bar Spacing: Controlling crack widths is heavily reliant on bar spacing. Smaller diameter bars spaced closer together control cracking much better than a few large diameter bars.
Side-Face Reinforcement: If your beam has a total depth exceeding
, ensure you add skin reinforcement along the vertical faces to control web cracking. Generating Output for the Field
Once the software confirms that the cracks are within safe limits and your flexural/shear capacities are met, use BeamD to produce the final outputs.
Generate an automated Bar Bending Schedule (BBS) and a detailed reinforcement sketch. 📌 Anchor Key Takeaway Atir Strap And Beamd With Fix Crack
⚠️ Always rely on engineering judgment. The software calculates reduced stiffness using empirical formulas. A program's calculated crack width is an estimation, and real-world factors like localized concrete honeycombing or shrinkage should always be reviewed on-site by a licensed structural engineer.
ATIR STRAP and BEAMD are powerhouse tools in the structural engineering world, offering a comprehensive suite for the analysis and design of complex structures like buildings, bridges, and industrial facilities. One of their most critical functions for reinforced concrete (RC) design is the ability to account for cracked section properties—a necessity for accurate deflection and stress analysis. Understanding ATIR STRAP and BEAMD
STRAP (STRuctural Analysis Program) is a Windows-based finite element static and dynamic analysis suite. It allows engineers to model everything from residential buildings to high-rise towers and communication facilities. BEAMD acts as an integrated module (or standalone tool) specifically for the design, detailing, and drafting of RC beams and slabs. Key capabilities include: STRAP Software Pricing, Alternatives & More 2026 | Capterra
Atir Engineering Software provides structural analysis and design through its primary suites, STRAP (STRuctural Analysis Programs) and BEAMD. While there is no single feature titled "Fix Crack," the software handles cracking in reinforced concrete (RC) through advanced deflection modules and specific design code checks. Analysis of Cracking in STRAP & BEAMD
In structural design, "fixing" for cracks typically refers to accounting for the reduction in stiffness caused by concrete cracking.
Effective Moment of Inertia: STRAP calculates deflection by considering the cracked moment of inertia ( Icrcap I sub c r end-sub
) instead of just the gross section. It uses an empirical "effective" approach (such as the Branson equation in ACI 318 or Eurocode 2) to determine reduced stiffness based on the ratio of the actual moment to the cracking moment.
Cracked Section Analysis: The results module allows users to specify deflection parameters that account for cracking, reinforcement ratios, and long-term factors like creep and shrinkage.
Crack Width Checks: For specific structures like retaining tanks, STRAP includes a Crack Width code check (based on EC2/BS8007) specifically for shell elements.
Beam Design with BEAMD: BEAMD is an integrated module specifically for RC beam design and detailing. It handles the transition from 2D analysis to full reinforcement scheduling, ensuring that the designed rebar meets code requirements to control cracking. Core Software Components
STRAP: A versatile finite element suite used for 3D static and dynamic analysis of buildings, bridges, and towers.
BEAMD: A dedicated solution for the design, detailing, drafting, and scheduling of reinforced concrete beams.
AutoSTRAP: A tool to convert BIM (IFC) or CAD (DXF) models into analytical models for use in STRAP or BEAMD. Key Features for Beam and Slab Cracking
Automated Beam Definition: The software can automatically identify beam spans and supports perpendicular to a height axis.
Multi-Storey Stage Construction: Analyzes how loads affect a structure during floor-by-floor construction, which is critical for understanding early-age cracking.
Non-Linear Factors: Users can define different load combinations for immediate and long-term (sustained) loads to accurately predict cracked-section behavior over time. AI responses may include mistakes. Learn more
AutoSTRAP | Automated Structural Frame Analysis Software by ATIR
ATIR STRAP (Structural Analysis Programs) and are professional-grade structural engineering software suites used for the finite element analysis (FEA) and design of various concrete and steel structures. ATIR Engineering ATIR STRAP Overview
STRAP is a versatile static and dynamic analysis program capable of handling structures ranging from simple plane frames to complex high-rise buildings and bridges. ATIR Engineering Key Capabilities
: Includes modules for designing hot-rolled, welded, and cold-formed steel frames, as well as reinforced/prestressed concrete elements like columns, walls, and slabs. Modeling Features
: Supports 1D beam elements, 2D shell/slab elements, and 3D solid elements. It also automates the conversion of BIM (IFC) and CAD (DXF) models into analytical models. Advanced Analysis ATIR STRAP and BeamD provide powerful automated workflows
: Features include P-Delta analysis, stage construction, seismic response spectrum, and bridge analysis. ATIR BEAMD Overview
BEAMD is a dedicated, integrated solution specifically for the
design, detailing, and drafting of reinforced concrete (RC) beams
In ATIR STRAP, managing reinforced concrete beams and addressing crack control is a core part of the design and detailing workflow. The software uses a modular approach, where the main STRAP finite element analysis results are passed to the RC Beams (often referred to in detailing contexts as BEAMD) post-processor to finalize reinforcement and check for serviceability requirements like crack widths. RC Beam Design and Crack Control Workflow
The software automates much of the process but allows for detailed manual overrides for compliance with international codes like ACI 318 or Eurocode 2. STRAP 2018 - RC Beams (Design & Detail)
Introduction
Atir Strap and Beamd are two popular software solutions used in the construction industry for designing and detailing reinforced concrete structures. While they are widely used, some users may encounter issues with cracks in their designs. In this feature, we'll explore the concept of Atir Strap and Beamd, their benefits, and provide a fix for cracks.
What is Atir Strap?
Atir Strap is a software solution used for designing and detailing reinforced concrete slabs, beams, and foundations. It allows users to create detailed designs and calculations for reinforced concrete structures, taking into account various factors such as loads, materials, and codes.
What is Beamd?
Beamd is a software solution used for designing and detailing reinforced concrete beams and columns. It provides users with a comprehensive toolset for creating detailed designs and calculations for reinforced concrete beams and columns, including analysis and verification of beam and column designs.
Common Issues: Cracks in Designs
One common issue users may encounter when using Atir Strap and Beamd is the appearance of cracks in their designs. Cracks can occur due to various factors, including:
Fixing Cracks in Atir Strap and Beamd
To fix cracks in Atir Strap and Beamd designs, users can follow these steps:
Best Practices for Using Atir Strap and Beamd
To minimize the risk of cracks in designs, users can follow these best practices:
By following these best practices and steps for fixing cracks, users can ensure that their Atir Strap and Beamd designs are accurate and reliable.
Do you have any specific questions or areas you'd like me to expand on?
This guide covers how to manage beam and slab cracking within (STRuctural Analysis Program) and its design modules like , developed by ATIR Engineering
In structural software, "fixing" a crack typically refers to calculating crack widths to ensure they meet code requirements or modifying the stiffness Fixing Cracks in Atir Strap and Beamd To
of a model to account for the reduced inertia of a cracked section. ATIR Engineering 1. Crack Width Analysis
If you are designing a beam and need to ensure cracks stay within allowable limits (e.g., EC2 or BS8007 standards): Access the Post-Processor : After running the initial analysis, enter the Concrete Design Select Code Checks
: Choose the appropriate national code (e.g., ACI 318, AS 3600, or EC2). Run Crack Width Check
: Use the "Crack Width" option (available for shell elements and beams in specific modules) to verify if the reinforcement is sufficient to control cracking. Adjust Reinforcement
: If the calculated crack width exceeds the limit, increase the rebar area or decrease the bar spacing in the detailing section of STRAP or BeamD. ATIR Engineering software 2. Modelling Cracked Sections (Stiffness Reduction)
For more accurate deflection results, you must "fix" the model by accounting for the fact that concrete loses stiffness once it cracks. ATIR Engineering Define Load Combinations
: Create specific combinations for "Service - Total" (immediate deflection) and "Service - Sustained" (long-term deflection). Calculate Effective Inertia module and select the Cracked Section
The software will calculate a reduced "effective" moment-of-inertia ( cap I sub e
) based on the ratio of the actual moment to the cracking moment.
STRAP will then automatically re-solve the model using these reduced stiffness values to provide more realistic deflection and force distributions. ATIR Engineering 3. Detailing and "Fixing" Connections
Sometimes "cracks" in a digital model are actually unconnected nodes. Geometry Check
: Use the "Geometry Check" command to find "unconnected intermediate nodes" on beams. The Split Command
command to connect these loose nodes to the beam, which "fixes" the structural discontinuity that can look like a failure or crack in the analysis. Detailing Drawings
or the STRAP concrete post-processor to generate bar bending schedules and detailed drawings that specify the exact rebar needed to prevent physical cracking. Summary of Key Tools Tool/Module Verify Crack Widths Concrete Design Post-Processor Fix Serviceability/Deflection Cracked Section & Long Term Deflections Adjust Rebar Detailing BeamD / RC Beams Detailing Fix Unconnected Nodes Geometry Check -> Split
For a deeper dive into specific menu paths, you can refer to the STRAP Full Manual for a cracked section analysis? RC Beams - Atir Engineering Software Development
Unlike flexible crack fillers, ATIR provides rigid reinforcement that:
The “Fix Crack” approach using ATIR is essentially mechanical stitching with continuous steel section, not just surface repair.
Smart Crack Stabilization & Load Redistribution Module
(for ATIR Strap + Beam Fix System)
| Feature | Epoxy Injection | Carbon Fiber Wrap | ATIR Strap/Beam | |--------|----------------|-------------------|------------------| | Tensile strength recovery | Moderate | High | Very high | | Crack reopening prevention | Low | Moderate | High (rigid restraint) | | Ductility after repair | Low | Low to moderate | Moderate (steel yielding) | | Structural capacity increase | No | Yes (limited) | Yes (significant) | | Fire resistance | Poor | Poor | Good (steel protected by concrete cover) | | Ease of surface finishing | Good | Moderate | Good (flush mount) |
ATIR excels where cracks are active (due to ongoing loads) or wide (>0.5 mm), and when future crack reopening must be prevented.