Cracked Concrete Uncovered: Causes, Consequences, and Solutions

Concrete cracks when tensile stresses from imposed loads or restraint conditions exceed its tensile strength. In structural design, concrete is generally assumed to crack under normal service loads, and crack width and distribution are managed through reinforcement detailing. The presence of cracks near anchors reduces their ultimate load capacity and increases displacement at failure compared to uncracked concrete.
 


The EU framework, including EN 1992-4 and EAD 330232, defines cracked concrete as concrete with visible cracks typically ranging between 0.1 mm and 0.3 mm or more. These standards require anchor testing and design considerations specifically for cracked concrete, accounting for reduced tensile capacity and altered load transfer around anchors.
 

Load Distribution Mechanism in Cracked Concrete

Cracks concentrate tensile stresses and disrupt uniform load distribution. The effective cross-section for load transfer is reduced, diminishing pull-out resistance and stiffness. Anchors placed in cracked concrete face higher displacement and lower load capacity, thus demanding stricter design criteria such as increased embedment depths, edge distances, and recommended anchor types qualified for cracked concrete.
 

 
  
Solutions: Simplifying Anchor Design for Cracked Concrete Using HILTI PROFIS Engineering
Designing anchors for cracked concrete can be complex due to stringent requirements and varying site conditions.

HILTI’s PROFIS Engineering software transforms this challenge into a straightforward process. The user-friendly system allows engineers to specify cracked concrete as the base material, automatically filtering anchors suitable for these conditions, performing all required calculations according to local and international design standards, and generating comprehensive design reports.

This approach removes guesswork and manual calculation errors, saving significant design time while maximizing safety and regulatory compliance. With PROFIS Engineering, engineers can confidently design robust anchor solutions tailored for cracked concrete, turning a difficult task into an efficient and reliable process.

Reference
European Committee for Standardization. (2018). EN 1992-4: Eurocode 2 - Design of concrete structures - Part 4: Design of fastenings for use in concrete. 

European Organization for Technical Assessment (EOTA). (2018). EAD 330232-00-0601: Technical approval of post-installed mechanical and chemical anchors for use in concrete (cracked and non-cracked).