Column and Beam Strengthening
Capacity-increase applications on the structural system’s vertical and horizontal members, true to their design; a holistic approach from section enlargement to composite systems.
The structure’s backbone demands priority.
A building’s earthquake safety is only as good as the weakest member of its structural system. Columns carry vertical loads to the ground, beams carry slab loads to the columns; an inadequacy in any link of that chain concerns the structure as a whole. That is why strengthening designs usually focus not on a single member but on a group of members working together.
There is no single right method in column and beam strengthening; section enlargement, jacketing, carbon fiber systems and reinforcement with steel elements each answer a different situation. Which method is used where is defined by the condition survey and the strengthening design; our duty is to execute the selected method faithfully to its design, supervised and on record.
- A holistic view: The member is treated not in isolation but as part of the structural system.
- A range of methods: From section enlargement to carbon fiber, the right method is selected per the design.
- Application in occupied buildings: The intervention is phased around the operating schedule.
- Engineering supervision: Every stage runs under civil engineering supervision.
Wherever capacity is in question.
Column and beam strengthening arises for different reasons; the reason defines the form of the intervention.
Seismic performance
Members found inadequate in the code assessment.
Increased service loads
Building sections whose function changes and loads increase.
Post-damage repair
Capacity loss after an earthquake or impact.
Reinforcement corrosion
Members that have lost section to corrosion.
Design and construction defects
Members built differently from their design.
Openings and alterations
Compensating for openings cut into the structure.
The four conditions for touching the structure.
Every intervention on the structural system follows the same discipline: diagnosis, design, supervised application and complete records.
Diagnosis and design
The existing condition is documented; the intervention is limited to the scope and detail defined by the strengthening design.
Surface and member preparation
The application surface is brought to the condition the design requires; the preparation defines the system’s life.
Supervised application
The application is carried out under civil engineering supervision, adhering to the manufacturer’s system approvals.
Records and handover
Every stage is documented; the work is handed over with a traceable application file.
The new section works together with the old.
Success in section enlargement depends on the new concrete behaving as a single section with the existing member; that unity is established by the anchors and the surface preparation.
- New concrete coverEnlarging the section and increasing the capacity: the new layer.
- New reinforcement and anchorsThe reinforcement layout tying the new section to the existing member.
- Bonding surfaceThe roughened, cleaned surface joining the two concretes.
- Existing reinforced concrete memberThe strengthened core, its condition established beforehand.
The right method for the situation.
Method selection belongs to the strengthening design; the headings below represent the most frequently applied approaches.
Reinforced concrete jacketing
Capacity and stiffness increase through section enlargement.
Carbon fiber systems
Lightweight reinforcement prioritizing section preservation.
Steel element reinforcement
Fast strengthening with steel profiles and plates.
Combined approach
Multiple methods used together in the same structure.
What is expected of a strengthening.
Capacity increase
The member is brought to the level the design requires.
Composite action
The new and existing sections behave as one body.
Phased application
Operational downtime is minimized by planning.
Fidelity to the design
No deviation from detail or scope.
A supervised process
Engineering supervision continues at every stage.
Traceable records
The application file is handed over complete.
The scope is defined by the design, not by assumption.
The classification below is indicative only. The final scope is defined by the condition survey and the strengthening design.
Which method, in which situation?
Depending on the member’s need, a lighter or more focused system may be sufficient.
Technical documents for members
Technical data sheets, safety data sheets and application specifications are available in the membership area open to corporate clients, architects and engineers. Access is free with membership.
Other strengthening systems
Let’s strengthen your structure’s backbone together.
Do you have a strengthening design in hand, or would you like to assess the existing condition? Let’s define the scope together.