Seismic vulnerability assessment: an essential step towards safer industrial warehouses
In recent years, seismic safety has become an increasingly important consideration within the industrial and logistics sectors. For companies operating warehouses, distribution centres, or facilities equipped with complex racking systems, understanding the structural condition of their installations is essential to ensuring safety, operational continuity, and regulatory compliance. Within this context, a seismic vulnerability assessment provides a practical and effective tool for evaluating the structural performance of existing installations and supporting the planning of any improvement or mitigation measures that may be required.
What the regulations require: when a seismic vulnerability assessment is needed
A seismic vulnerability assessment evaluates a structure’s ability to withstand seismic actions in accordance with applicable regulations.
The regulatory framework includes:
NTC 2018 (Ministerial Decree of 17 January 2018)
The Italian Building Code defines the design and verification criteria for both new and existing structures. It introduces different levels of knowledge (LC1–LC3) and requires verification against seismic limit states, including the Life Safety Limit State (SLV) and Collapse Prevention Limit State (SLC).
OPCM No. 3274/2003
This ordinance establishes the requirement to carry out seismic assessments for strategic structures and relevant structures—namely those whose failure could result in serious consequences for people, essential services, or industrial activities. It also requires the planning of improvement or upgrading measures based on the outcome of the assessment.
Legislative Decree 81/2008 – Occupational health and safety
Italian workplace safety legislation requires employers to assess all risks, including seismic risk, as part of the Risk Assessment Document (DVR). Employers must ensure that structures within the workplace are stable, safe, and suitable for their intended use.
When a seismic vulnerability assessment is required or recommended
A seismic vulnerability assessment is either mandatory or strongly recommended in the following situations:
- Strategic or relevant structures as defined by OPCM No. 3274/2003, where seismic assessment and the subsequent planning of improvement measures may be required.
- Structural modifications, facility expansions, or changes in loading conditions affecting buildings or racking systems, in accordance with NTC 2018 and applicable European standards.
- Changes in the intended use of a facility or significant increases in stored loads that may alter the structural behaviour of the installation.
- Recent seismic events or the detection of damage following earthquakes, including those of relatively low intensity.
- Requests from inspection bodies, insurance providers, or customers seeking evidence of compliance, safety, and structural reliability.
- Updates to the company’s Risk Assessment Document (DVR) when seismic risk is identified as a significant factor within the workplace safety assessment.
In all these situations, a seismic vulnerability assessment provides the technical basis for understanding the actual performance of existing structures and for defining any actions required to improve safety and compliance.
The 2023 Guidelines issued by the Italian Superior Council of Public Works for racking systems in seismic areas provide a framework for the management of existing installations and, where necessary, allow the adoption of temporary mitigation measures, such as load capacity reductions, loading restrictions, or operational limitations, pending a full structural assessment and any subsequent improvement or retrofit programme. These measures, however, do not replace a seismic vulnerability assessment, which remains the primary technical tool for evaluating and documenting the structural safety of a warehouse and its storage systems.
Modulblok’s seismic audit service
Benefits for warehouse operators
- A clear and objective understanding of the structural safety level of racking systems and storage installations.
- A technical basis for improvement or retrofit decisions, whether through seismic improvement measures, which enhance structural performance without necessarily achieving the standards required for new-build structures, or through seismic retrofitting, which brings the installation to a safety level comparable to that of newly designed systems.
- Reduced operational risk, helping to protect personnel, stored goods, equipment, and business continuity.
- Documented decision-making support for planning targeted interventions and prioritising investments.
- Engineering solutions for seismic improvement or retrofitting, developed in accordance with current regulations and technical standards.
- Access to Modulblok’s engineering expertise, built on decades of experience in the design, analysis, and development of industrial warehouse systems.
Complying with seismic safety regulations is not only a matter of regulatory compliance; it is also a way to safeguard business continuity and reinforce an organisation’s reputation as a safe, reliable, and responsible operator.
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