Progressive Collapse Resistance in Structural Systems

Progressive collapse refers to the phenomenon whereby an initial local failure in a structural system propagates, triggering subsequent failures and potentially culminating in partial or total collapse. Resistance to progressive collapse is a fundamental objective in structural engineering, demanding designs that ensure alternative load paths, adequate redundancy and robust connections. Contemporary research integrates advanced computational modelling, full-scale experimentation and novel material solutions to devise strategies for controlled failure sequences, energy dissipation and damage containment. The global importance of this work spans tall buildings, long-span bridges and engineered timber structures exposed to accidental actions, seismic shaking, blast loads and extreme environmental events. Practical applications range from code provisions and design guidelines to retrofitting schemes for existing stock, all aiming to enhance the resilience and safety of critical infrastructure.

Research from Nature Portfolio

Recent studies have introduced a collapse isolation concept that advances beyond traditional load-redistribution measures. Instead of maximising connectivity, this approach embeds predetermined sacrificial zones that yield before key stability components, thereby segmenting the structure into compartments and arresting the spread of damage. Full-scale tests have demonstrated that, under large initial failures, increased connectivity alone can exacerbate global collapse, whereas controlled isolation channels failure into non-critical regions. This framework constitutes a ‘last line of defence’, offering targeted energy absorption and reinforcing resilience in scenarios where conventional strengthening would prove insufficient.

Research from all publishers

A comprehensive database of building collapses has been compiled to record hazard types, initial failure modes and propagation mechanisms, enabling statistical analyses and the refinement of consequence models for casualty and economic loss estimation. In the bridge engineering domain, state-of-the-art reviews of arch, continuous girder, cable-stayed and truss systems have identified critical parameters—such as member slenderness, support conditions and dynamic amplification—and proposed mitigation techniques including local reinforcement, geometric optimisation and staged demolition methods. Research on timber beams has highlighted the pivotal role of catenary action in disproportionate collapse prevention. Analytical models for laterally loaded wood members reinforced with tension strips have been validated experimentally, illustrating the transition from bending to axial tension-dominated load-carrying modes under progressive damage scenarios.

Progressive Collapse Resistance in Structural Systems publication trend

The graph below shows the total number of articles in progressive collapse resistance in structural systems across all publications each year (not limited to Nature Index journals).

Technical terms

Progressive collapse: The sequential failure of structural elements following an initial local damage event.

Alternate load path: A design principle ensuring that loads can be redistributed through unintended pathways when primary members fail.

Redundancy: The inclusion of additional structural components or load paths to prevent collapse following damage.

Collapse isolation: A strategy that incorporates sacrificial or weak links which fail first to compartmentalise damage and prevent global collapse.

Catenary action: The mechanism by which bending members develop axial tension to support loads after significant deflection or separation.

Structural robustness: The capacity of a structure to withstand or adapt to unanticipated loads or damage without suffering disproportionate collapse.

References

1. Arresting failure propagation in buildings through collapse isolation. Nature (2024).
2. Learning from the progressive collapse of buildings. Developments in the Built Environment (2023).
3. Bridge structures under progressive collapse: A comprehensive state-of-theart-review. Results in Engineering (2023).
4. Catenary action in strip-reinforced wood and timber beams. Construction and Building Materials (2023).