Tension estimates in cable stayed bridges

A benchmark problem on an existing cable-stayed bridge was recently proposed. Recorded signals are available for standard working conditions and for special events (typhoons!). In this contribution, the authors report their attempt to detect significant variations in the cable tension during these extreme events

validation of a data fusion based solution in view of the real time monitoring of cable stayed bridges

Abstract A precise assessment of the displacements induced by external actions on cables-stayed bridges may be currently challenging and costly when conventional structural health monitoring (SHM) solutions are applied. In order to bypass the drawbacks of wired solutions and the use of expensive equipment, a novel approach is proposed. A Kalman filter-based data fusion of multiple responses is adopted. A GPS receiver and a three-axial accelerometer are used as sensors. The GPS accuracy is enhanced exploiting the satellite corrections provided by a single reference station. The proposed system is validated in situ on the "Tesa" timber footbridge

Framing a satellite based asset tracking (SPARTACUS) within smart city technology

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Quantity vs. Quality in the Model Order Reduction (MOR) of a Linear System

The goal of any Model Order Reduction (MOR) technique is to build a model of order lower than the one of the real model, so that the computational effort is reduced, and the ability to estimate the input-output mapping of the original system is preserved in an important region of the input space. Actually, since only a subset of the input space is of interest, the matching is required only in this subset of the input space. In this contribution, the consequences on the achieved accuracy of adopting different reduction technique patterns is discussed mainly with reference to a linear case study

Experimental investigation on the aging of the base isolator elastomeric component

Base isolation is a well-established technique of vibration mitigation. Among the many devices available on the market, elastomeric base isolators are widely adopted. Their drawback is the aging of the elastomeric component, which makes a strict maintenance plan mandatory. This manuscript summarizes an experimental study where the performance of new base isolators is compared with that of 10-years old devices

STOCHASTIC FINITE-ELEMENTS FOR CRASH PROBLEMS

Stochastic finite elements in crash problems via response surfac

Wireless sensors for structural control

In the field of civil engineering, wireless sensor networks are mostly considered for structural monitoring systems. In this paper the authors attempt to apply it into a structural control system for a 3-storey frame mounted on a shaking table. The structural control system mainly consists of four accelerometers, a structural controller and an Active Mass Damper (AMD) as actuator. The designed wireless sensors is based on the use of recent low-power System-on-Chip wireless transceivers which integrate an 8051 microcontroller core and are able to operate in most license-free Industrial, Scientific and Medical (ISM) frequency bands . The requirement of continuous and real-time sensing in the structural control applications represents the main challenge for the wireless sensor network which has the problem of data loss. The AMD is based on a direct current (DC) motor driven by a newly designed proportional, integral and derivative (PID) controller