STRUCTURES APPLICATION
Structural & Geotechnical Monitoring for Civil Structures
Monitor settlement, deformation, tilt, strain, load, vibration and foundation behaviour throughout construction and service life.
Buildings Bridges Towers Stadiums Foundations Critical structures
Engineering scope
Monitoring Structures from Foundation to Superstructure
A civil structure does not respond in isolation. A useful monitoring plan connects what happens in the ground and foundation to the behaviour of the structural system above it, then separates construction effects from environmental and operational effects. That means establishing a baseline, defining measurable parameters and interpreting readings against the design assumptions and trigger framework.
Understand the support conditions
Track ground settlement, foundation movement, pile behaviour, groundwater change and soil–structure interaction around foundations, excavations and retaining systems.
Measure the response
Assess vertical and lateral movement, tilt, crack movement, strain, stress, load, vibration, acceleration and dynamic response in concrete, steel and temporary works.
Explain changes in the data
Relate readings to temperature, wind, construction vibration, nearby excavation, traffic, machinery and groundwater variation so that an engineer can act on trends, not isolated numbers.
The audience may include contractors, consultants, developers, asset owners and monitoring engineers. The scope can combine geotechnical instrumentation, building monitoring and survey methods within one project plan.
Measured parameters
What Should Be Monitored?
The right parameter follows the credible failure mechanism, the structural system and the decision that the monitoring data must support. A compact network is often more useful than a large list of unconnected sensors.
Settlement
Foundation and structural vertical movement, including differential settlement.
Horizontal movement
Lateral translation and structural displacement of buildings, bridges, towers and temporary works.
Tilt & rotation
Changes in inclination or rotation caused by differential movement, loading or ground response.
Crack & joint movement
Opening, closing and relative displacement across cracks, joints and interfaces.
Strain & stress
Structural response within concrete and steel elements, interpreted with material and section properties.
Structural load
Forces in columns, struts, piles, anchors, supports and bearings where direct load measurement is appropriate.
Vibration & dynamic response
Construction, machinery, wind, traffic and seismic response, with the measurement quantity matched to the risk.
Groundwater & soil behaviour
Pore-water pressure and ground response around foundations, excavations and retaining systems.
Temperature
Thermal movement interpretation and temperature compensation for long-term structural behaviour.
Field instrumentation
Instrumentation for Structural Monitoring
Instruments are selected according to the failure mechanism, design assumptions, structural system, construction sequence, required accuracy, monitoring frequency and trigger framework. Not every project needs every instrument.
Survey prisms + total station / ATS
Measure 3D displacement, settlement and lateral movement from stable reference points. Suitable for multi-point manual or automated survey monitoring where line of sight is available.
Manual or automated · surface geometryPrecision levelling points
Provide high-precision vertical settlement data on foundations, floors, structures and benchmarks. A mature option for periodic surveys with a controlled datum.
Typically manual · vertical movementTiltmeters
Measure local inclination and rotation continuously or periodically on structures, piers, walls and sensitive assets.
Manual or automated · local rotationCrackmeters
Vibrating-wire crackmeters, LVDT crackmeters and displacement transducers measure crack width or joint movement across a defined direction.
Manual or automated · relative displacementStrain gauges
Vibrating-wire, electrical-resistance, embedment and weldable gauges measure strain in concrete or steel. Stress is inferred only with suitable calibration and engineering assumptions.
Manual or automated · strain responseLoad cells
Measure direct structural or foundation load in anchors, supports, columns, temporary works and bearings when a suitable load path and installation arrangement exist.
Automated-capable · direct forceAccelerometers
Capture acceleration, dynamic behaviour, natural frequencies and modal response for load testing, operational assessment or structural health monitoring.
Automated · dynamic responseGeophones / vibration monitors
Measure vibration velocity and peak particle velocity for construction, traffic and machinery effects, often against a project vibration criterion.
Manual or automated · PPV / velocityGNSS / high-precision GNSS
Measure global movement over long periods where satellite visibility, antenna stability and the required accuracy make it suitable.
Automated-capable · global coordinatesInclinometers
Measure subsurface lateral movement in foundations, retaining structures, piles and ground profiles using access casing and repeatable reference points.
Typically manual or automated · subsurface movementPiezometers & extensometers
Piezometers measure pore-water pressure; extensometers measure relative displacement or ground and foundation deformation.
Manual or automated · ground responseTemperature sensors & FBG
Thermistors support thermal interpretation and compensation. Fibre Bragg Grating sensors can provide multiplexed strain or temperature measurements in difficult-to-access structures.
Automated-capable · strain / temperatureSelection principle: instrumentation is a measurement system, not a catalogue. The same parameter may need different instruments at different points because accuracy, frequency, access, reference stability and the decision threshold are different.
Engineering decisions
Choosing Instruments for the Same Engineering Parameter
“Automated” or “more advanced” does not automatically mean “more appropriate”. The instrument should match the measurement quantity, accuracy, frequency, geometry, access and response action.
Settlement / vertical movement: precise levelling, ATS + prism or GNSS?
Precise levelling
High vertical precision and a mature method for periodic monitoring. It is manual and survey-dependent, and needs suitable benchmarks and a workable route.
ATS + prism
Automatic, multi-point 3D movement readings at a high frequency. It needs line of sight, stable references and consideration of atmospheric and optical effects.
GNSS
Useful for long-term global coordinates without intervisibility between each monitored point. It is usually less suitable than levelling for very small vertical movement and needs satellite visibility.
Project precision and decision thresholds determine the method; the newest instrument is not always the best instrument.
Tilt / rotation: electronic or MEMS tiltmeter versus ATS geometry
Electronic / MEMS tiltmeter
Measures local rotation directly and is suited to continuous or high-frequency automated monitoring at a point.
Survey prism + ATS
Uses multiple spatial points to derive overall structural movement and a deformation pattern, rather than only local angle.
Engineering choice
Use a tiltmeter for local inclination change; use survey geometry when the question is how the whole structure translates, rotates or deforms.
Strain / stress: vibrating-wire, electrical-resistance or FBG sensor
Vibrating-wire strain gauge
Well suited to long-term monitoring in concrete or steel, stable readings and long cable runs.
Electrical-resistance strain gauge
Useful for dynamic or short-term response, laboratory work and load tests where higher-frequency acquisition is required.
FBG fibre optic sensor
Supports multiplexed sensing and environments with electromagnetic interference. Strain and stress remain different quantities: stress usually requires material properties, calibration and structural assumptions.
Load: direct load cell versus strain-based inference
Load cell
Measures force directly and can suit anchors, supports, columns, temporary works and bearings when installation is practical.
Strain gauge
Can infer force where a direct load cell is impractical, but needs calibration, section properties and understanding of the load path.
Engineering choice
Direct force is not automatically more informative: the load path, installation effect and required decision are part of the measurement design.
Crack movement: manual gauge, LVDT or vibrating-wire crackmeter
Manual crack gauge / tell-tale
A low-cost choice for periodic observations and lower monitoring frequency where remote alerts are not required.
LVDT / electronic crackmeter
Provides automatic, continuous readings with high resolution where a frequent trend or alarm is needed.
Vibrating-wire crackmeter
Designed for long-term remote monitoring and harsh field environments, subject to appropriate installation and temperature interpretation.
Vibration: geophone / vibration monitor versus accelerometer
Geophone / vibration monitor
Primarily measures particle velocity and PPV for construction vibration, compliance and effects on nearby assets.
Accelerometer
Measures structural acceleration for dynamic response, natural frequencies, modal behaviour and load testing.
Why the distinction matters
Both are used in vibration monitoring, but they measure different quantities for different engineering purposes and acceptance criteria.
Monitoring workflow
Monitoring Strategy Through the Structure Lifecycle
A monitoring system becomes more valuable when its baseline, construction events, data review and operational questions are planned together.
Baseline
Before construction or another disturbance, record initial survey, crack condition, level, tilt, vibration and groundwater conditions.
Construction
Follow excavation effects, foundation loading, structural loading, temporary works, vibration and settlement against the planned sequence.
Commissioning / load testing
Review load response, strain, movement and dynamic properties, and compare measured behaviour with the baseline model.
Long-term operation
Track creep, shrinkage, settlement, deterioration, wind, temperature, seismic response and other meaningful long-term changes.
For projects that need frequent alerts or remote review, a manual baseline can be combined with automated monitoring and a documented trigger-action plan.
Independent references
Verified Structural Monitoring Case Studies
The examples below are drawn from owner, government, university, peer-reviewed or specialist engineering sources. They illustrate how monitoring has been applied internationally; they are not presented as GEOUE projects.
The projects below are independent industry reference cases illustrating how structural and geotechnical monitoring has been applied internationally. Unless explicitly stated otherwise, they are not GEOUE projects.
I-35W Bridge, Minnesota
FHWA describes monitoring during construction and long-term bridge performance, including thermal effects in mass concrete, construction loads transmitted into drilled shafts and columns, and later bridge-load behaviour.
View case details
FHWA’s chapter records thermocouples, vibrating-wire strain gauges, resistive strain gauges and data acquisition/loggers in the foundation monitoring context. It is a useful example of connecting foundation, column, superstructure and long-term monitoring questions.
Source: U.S. Federal Highway Administration, “I-35W Bridge Foundation Monitoring”
Akashi Kaikyo Bridge
JB Honshi describes a monitoring system that collects dynamic response data to verify design assumptions under strong wind and earthquake conditions and to support more rational design.
View case details
The published technical reference is an example of long-term dynamic monitoring used for design verification and understanding bridge behaviour. This page does not infer sensor types beyond what the source supports.
Source: Honshu-Shikoku Bridge Expressway Company, “Monitoring System of the Akashi Kaikyo Bridge”
Shanghai Tower
A Hong Kong Polytechnic University research record describes construction-stage monitoring of settlement and displacement, with a structural health monitoring system containing more than 400 sensors.
View case details
The record identifies 27 wind-pressure sensors and 40 inclinometers among the system and discusses deformation and strain/stress monitoring. The case demonstrates why a tall building may need both foundation movement and structural response data.
Marina Bay Sands
Arup’s project material explains the engineering challenge of three 55-storey towers on deep marine clays, including individual tower movement, wind and human movement, vibration testing and tuned mass dampers.
View case details
This is a structural behaviour and verification reference rather than a claim about a GEOUE monitoring installation. The project illustrates why movement, differential settlement, angular rotation and dynamic behaviour must be considered together in complex structures.
Lotte World Tower, Seoul
A peer-reviewed Automation in Construction paper reports real-time structural health monitoring of a supertall building under construction using ambient vibration and visual modal identification.
View case details
The paper discusses mode shapes, damping and a baseline model. It is a useful example of construction-stage SHM focused on dynamic properties rather than only visible displacement.
Source: Yonsei University record, “Real-time structural health monitoring of a supertall building under construction” · DOI
Ciel Tower, Dubai
Sixense Middle East lists instrumentation and monitoring for enabling works, covering ground and structure behaviour with optical prisms, levelling points, inclinometers, IPI chains, extensometers and piezometers.
View case details
The reference identifies monitoring of settlement, deflection, deformation and ground movements using Geoscope/Cyclops systems. It is a practical example of combining surface, subsurface and groundwater-related measurements around a major tower.
Source: Sixense Middle East, “Monitoring for Ciel Tower, United Arab Emirates”
Expansion of Al Masjid Al Haram, Mecca
Encardio’s project reference lists foundation instrumentation including earth-pressure cells, concrete-pressure cells, piezometers, embedment strain gauges, sister bars and automatic data acquisition.
View case details
The stated purpose is to monitor foundations, support pillars and elevator-related structural elements. The case illustrates how pressure, pore-water and strain measurements can sit alongside the structural monitoring strategy in a complex expansion.
GEOUE approach
Why GEOUE for Structural Monitoring?
A monitoring plan should help a project team understand risk and make decisions. GEOUE can discuss the ground, foundation, structure, environment and data workflow as connected parts of the same engineering question.
Integrated ground + structure view
Consider ground movement, foundation behaviour, groundwater, construction activities and structural response together.
Risk-led instrument selection
Choose a measurement method by failure mechanism, accuracy, frequency, accessibility, reference stability and data requirement.
Manual + automated options
Combine survey, manual instrumentation, automated sensors, dataloggers and remote dashboards where the project benefits from each.
Interpretation with context
Review baseline, trend, rate of change, instrument correlation, construction events and environmental effects—not just a list of readings.
Explore related settlement monitoring and instrumentation capabilities, or visit the GEOUE Technical Hub for engineering context. Any final scope should be confirmed against the project drawings, specifications, access and trigger-action requirements.
Practical answers
Frequently Asked Questions
What instruments are used for structural monitoring?
Common options include survey prisms and total stations, precision levelling points, tiltmeters, crackmeters, strain gauges, load cells, accelerometers, geophones, GNSS, inclinometers, piezometers, extensometers, temperature sensors and fibre optic sensors. The selection depends on the parameter, failure mechanism, accuracy, frequency, access and trigger framework.
How is structural settlement monitored?
Structural settlement may be measured with precision levelling points, survey prisms and total stations, GNSS or foundation and ground instruments. The datum, reference stability, required vertical precision, observation frequency and whether differential movement matters should be defined before choosing the method.
What is the difference between a tiltmeter and survey monitoring?
A tiltmeter measures local inclination or rotation at an installed point, often continuously. Survey monitoring measures coordinates at multiple points and can show whole-structure translation, rotation and deformation geometry. Many projects use both when local and global behaviour answer different engineering questions.
What is the difference between a strain gauge and a load cell?
A load cell is designed to measure force directly in a suitable load path. A strain gauge measures strain; force or stress may then be inferred using calibration, section properties, material behaviour and structural assumptions. The choice depends on installation practicality and the decision the data must support.
When should automated structural monitoring be used?
Automation is useful when readings are needed frequently, access is difficult, construction is fast-moving, a trigger threshold needs timely review, or remote stakeholders need a shared view. A good automated system still needs a baseline, quality checks, reference stability, alert rules and an agreed response process.
Can structural monitoring include foundations and groundwater?
Yes. Structural behaviour can be influenced by foundation movement, pile response, pore-water pressure, excavation effects and soil–structure interaction. Piezometers, inclinometers, extensometers, levelling and survey instruments may be combined with structural sensors when the ground mechanism is relevant.
How do you select monitoring instruments for an existing structure?
Start with the observed or credible mechanism, the structural drawings and condition survey, then define the parameter, reference, accuracy, frequency, access, environment and action threshold. A baseline survey and a small pilot installation can help confirm that the chosen sensor and location answer the engineering question.
Start with the engineering question
Discuss Your Structural Monitoring Requirements
Every structure has a different load path, foundation system, risk profile and monitoring objective. Share your drawings, monitoring specification or project requirements with GEOUE and we can discuss an appropriate instrumentation and monitoring approach.