Engineering summary
AC156 defines how nonstructural components are shake-table tested for seismic safety. This article explains AC156, why vertical (Z-axis) testing matters, and how QuakeLogic’s SHAKEBOT-40Z supports AC156-style vertical seismic demand testing.
In seismic design, nonstructural components—such as mechanical equipment, electrical systems, architectural elements, and mounted devices—often govern life-safety risk during earthquakes. To address this, the building-code community relies on a standardized testing protocol known as AC156.
This article explains what AC156 is, why vertical (Z-axis) testing matters, and how QuakeLogic’s SHAKEBOT-40Z enables AC156-style vertical seismic demand testing for laboratories, manufacturers, and research institutions.
What Is AC156?
AC156 is the Acceptance Criteria for Seismic Qualification Testing of Nonstructural Components, published by ICC Evaluation Service (ICC-ES).
AC156 defines how shake-table testing must be performed to demonstrate that nonstructural components can safely withstand seismic demand required by modern U.S. building codes, including the International Building Code (IBC) and ASCE 7.
Important:
AC156 is not a product certification.
It is a testing methodology used to evaluate component performance.
Why Vertical (Z-Axis) Seismic Testing Matters
While AC156 is commonly associated with horizontal (X- and Y-axis) testing, vertical seismic demand is critical for many components, especially those subject to:
- Uplift forces
- Compression–tension cycling
- Anchor bolt pull-out
- Loss of gravity load path
- Vertical resonance effects
Vertical testing is particularly relevant for:
- Rooftop and floor-mounted equipment
- Suspended or braced systems
- Racks, cabinets, and electrical assemblies
- Anchored mechanical and piping components
As vertical ground motion becomes better understood, AC156-style vertical testing is increasingly requested by engineers of record, hospitals, and code reviewers.
How AC156 Testing Works (Simplified)
AC156 specifies:
- Required Response Spectra (RRS) derived from seismic design parameters
- Broad-band random motion, not simple sine sweeps
- Acceleration verification at the shake table and test article
- Defined test duration and repetition
- Performance criteria, including:
- No collapse or detachment
- Anchorage integrity
- Continued function when required
Compliance depends on test execution, instrumentation, and engineering judgment—not on the shake table alone.
Introducing the SHAKEBOT-40Z Vertical Shake Table
The SHAKEBOT-40Z is QuakeLogic’s compact, high-performance single-axis vertical (Z-axis) shake table, purpose-built to apply controlled vertical acceleration, displacement, and frequency content representative of AC156 vertical seismic demand.
According to the official datasheet, the SHAKEBOT-40Z is designed to support AC156-style vertical testing, including uplift–compression response and controlled seismic time histories.
Key Capabilities for AC156-Style Vertical Testing
Purpose-Built Vertical Motion
The SHAKEBOT-40Z delivers pure Z-axis excitation, allowing laboratories to isolate vertical demand without horizontal coupling.
Closed-Loop Motion Control
High-resolution feedback enables repeatable vertical acceleration and displacement profiles, a core requirement for standardized seismic qualification testing.
Custom Seismic Inputs
Users can apply custom vertical time histories (CSV) derived from AC156-compatible spectra or site-specific motions, supporting both research and qualification testing.
Safety-Focused Design
Integrated software limits, mechanical end-stops, torque protection, and emergency stop functionality ensure safe operation during high-demand tests.
Typical Applications
The SHAKEBOT-40Z is well suited for:
- AC156-style vertical seismic qualification testing
- Uplift and compression response studies
- Z-axis demand evaluation of nonstructural components
- Academic and applied research on vertical ground motion
- Laboratory instruction and demonstration testing
These applications are explicitly identified in the system documentation.
Why Laboratories Choose QuakeLogic
QuakeLogic designs shake-table systems that balance:
- Technical rigor
- Compact laboratory footprint
- Cost-effective deployment
- Reviewer-safe documentation
- Cross-platform software control
The SHAKEBOT-40Z extends this philosophy into vertical seismic testing, filling a critical gap for labs and manufacturers addressing Z-axis demand.
Learn More
📄 Download the SHAKEBOT-40Z Datasheet
👉 shakebot-40z-vertical-shake-table-datasheet.pdf
📧 Questions about AC156 testing or vertical qualification?
Contact sales@quakelogic.net
Last reviewed: 2026-07-04
Executive Summary
Structural testing validates how components, systems, and instrumentation behave under controlled loads, motion, vibration, and boundary conditions. This article has been expanded as an engineering resource for readers evaluating structural testing concepts, instrumentation choices, and monitoring workflows. The discussion is educational and should be paired with project-specific review by qualified engineers, applicable codes, owner requirements, and equipment documentation.
Key Takeaways
- Define the engineering objective before selecting sensors, test equipment, trigger thresholds, or reporting workflows.
- Use calibrated instrumentation, documented installation practices, time synchronization, and traceable data handling where measurement quality matters.
- Interpret measured data in context: site conditions, structure type, noise environment, sampling rate, bandwidth, and boundary conditions all affect conclusions.
- Use authoritative references and project-specific criteria rather than relying on generic thresholds or unsupported performance claims.
Technical Explanation
In practical structural testing work, the engineering system is more than a sensor or a test platform. A credible workflow includes the measurement objective, instrument selection, mounting or boundary conditions, sampling and timing strategy, data validation, event or response detection, engineering review, and reporting. Weakness in any part of that chain can reduce confidence in the final interpretation.
For monitoring applications, engineers should document sensor orientation, coupling, environmental exposure, dynamic range, frequency bandwidth, data logger configuration, clock synchronization, communications, and maintenance procedures. For testing applications, engineers should document input motion, fixture design, payload properties, control limits, safety interlocks, acceptance criteria, and post-test data review.
Engineering Applications
| Application | Engineering Question | Typical Evidence Needed |
|---|---|---|
| Research and education | How does a structure, component, or sensor respond under controlled conditions? | Test plan, calibrated data, input motion, boundary conditions, and repeatable observations. |
| Critical infrastructure | Is the asset response normal, changing, or potentially unsafe after an event? | Baseline data, event records, thresholds, inspection workflow, and engineering sign-off. |
| Industrial facilities | Can monitoring support operational continuity and response decisions? | Site-specific criteria, reliable telemetry, alarm logic, maintenance records, and documented procedures. |
People Also Ask
What should be specified before buying equipment?
Specify the measurement objective, frequency range, amplitude range, environment, data format, timing needs, installation constraints, reporting requirements, and applicable standards or owner criteria.
Why do references and standards matter?
They provide terminology, acceptance criteria, test methods, and documentation expectations. They do not replace engineering judgment, but they reduce ambiguity and make results easier to review.
How should data quality be checked?
Review calibration status, timing, clipping, sensor orientation, signal-to-noise ratio, environmental artifacts, data completeness, and whether the record supports the engineering decision being made.
Related QuakeLogic Resources
- Understanding Non-Structural Seismic Shake Table Testing: AC156 Compliance and Test Plan Creation
- Shake Table Testing for Nonstructural Components: AC 156 Applications
- Electro Servo Motors or Linear Motors for Shake Tables: Choosing the Right Technology
- Newly-designed 250-kg Uniaxial Shake Table: Precision and Power for Testing
- Related QuakeLogic products and technologies
- QuakeLogic Engineering Blog topic resources
References
Recommended Diagram or Download
Media placeholder: Add an original diagram showing the measurement chain from sensor or test platform to data acquisition, analysis, engineering interpretation, and reporting. Where this article becomes a buyer guide or application note, create a downloadable PDF version after engineering review.
Discuss a Monitoring or Testing Application
QuakeLogic supports seismic monitoring, earthquake early warning, structural health monitoring, infrasound monitoring, vibration monitoring, data acquisition, and shake table testing applications. For project-specific guidance, contact QuakeLogic with the asset type, measurement objective, site constraints, and required deliverables.
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Topic cluster
Related engineering knowledge areas
- Earthquake EngineeringSeismic hazard, ground motion, structural response, fragility, and resilience guidance.
- Structural Health MonitoringMonitoring for bridges, buildings, dams, tunnels, industrial facilities, and resilient infrastructure.
- Earthquake Early WarningOn-site detection, alerting workflows, seismic switches, and critical infrastructure warning systems.
- Infrasound MonitoringLow-frequency acoustic sensing for environmental noise, blast, UAV, volcano, and defense applications.
Definitions and references
Terms, standards, and source cues
- seismic hazard: related to Earthquake Engineering in this QuakeLogic knowledge cluster.
- ground motion: related to Earthquake Engineering in this QuakeLogic knowledge cluster.
- SHM: related to Structural Health Monitoring in this QuakeLogic knowledge cluster.
- damage detection: related to Structural Health Monitoring in this QuakeLogic knowledge cluster.
- earthquake early warning: related to Earthquake Early Warning in this QuakeLogic knowledge cluster.
- seismic switch: related to Earthquake Early Warning in this QuakeLogic knowledge cluster.
- infrasound sensors: related to Infrasound Monitoring in this QuakeLogic knowledge cluster.
- low-frequency noise: related to Infrasound Monitoring in this QuakeLogic knowledge cluster.
Standards mentioned
- AC156 seismic qualification/testing references
- ASCE 7 seismic design/site-classification references
- ISO documentation only when supported by source material
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