Toward identifying the ASR-induced stresses from displacement measurements and crack observations—Demonstration on a beam bridge in Norway

Alkali–silica reaction (ASR) in concrete causes expansion and degradation of the material, which might give adverse structural consequences. From the structural engineer point view, the greatest concern is if ASR leads to loss of structural integrity. Two natural questions arise when assessing existing concrete structures affected by ASR: (1)...

Long-term viscoelastic deformation monitoring of a concrete dam: A multi-output surrogate model approach for parameter identification

Dam safety monitoring has become an important topic and is critical for evaluating a dam's safety status. This study focuses on identifying the mechanical properties of a concrete dam from long-term viscoelastic deformation monitoring data. A novel inversion framework is proposed in which a surrogate model, instead of the finite element model,...

Development of a Marker-Based iFEM Optimisation Approach for Aeroelastic Load Characterisation in Gust

In order to assess the span-wise load distribution in an aeroelastic gust encounter, a novel method is developed which makes use of marker-based optical tracking. This allows for the prediction of the elastic force and the computation of the inertial force such that Collar's triangle may be quantified during the encounter through an iFEM...

Application of an inverse analysis using the Ensemble Kalman Filter method to a deep excavation case: with validation of constitutive soil models

Displacement control is of utmost importance in deep excavation design and is usually based on numerical modelling, e.g. Finite Element Method (FEM). Numerical methods tend to be more conservative when analysing soil behaviour during deep excavation, whereas for practical and economic reasons this is not favoured. The inverse analysis allows for...

Constrained observability techniques for structural system identification using modal analysis

The characteristics of civil structures inevitably suffer a certain level of damage during its lifetime and cheap, non-destructive and reliable methods to assess their correct performance are of high importance. Structural System Identification (SSI) using measured response is the way to fine why performance is not correct and identify where...

Identification of mine blast interaction pressure on excited plates: Using transient adjoint optimization for solving the inverse problems

Mines and improvised explosive devices are the cause of many mortalities of vehicle occupants. Both experimental and numerical research in this field aims to improve the safety of military vehicles. TNO has advanced Finite Element (FE) models to simulate such events. The numerical research is done to better understand mine blasts. Another aim is...

Evaluation of inverse analysis methods with numerical simulation for slope excavation

Insufficient information on soil parameters and their spatial variability pose as a main factors of uncertainty in geotechnical design. When soil response differs from the expected, the notion of inverse analysis becomes relevant; back-calculating the parameter set able to reproduce the monitored observations. Accordingly, its application...

Reduction of uncertainty in stability calculations for slopes under seepage

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Fibre Reinforced Profiled Mortar Joints for Precast Concrete Structures

The precast concrete sector is growing and to continue this growth it is necessary that new innovations, ideas, technologies etc. are developed to improve the functionality of precast concrete structures. Many applications can be found nowadays for all different kinds of precast concrete elements. One such application for example is precast...