Civil Engineering

Modelling bicycle use intention: the role of perceptions
Users’ perceptions are identified as key elements to understand bicycle use, whose election cannot be explained with usual mobility variables and socio-economic characteristics. A hybrid model is proposed to model the intention of bicycle use; it combines a structural equations model that captures intentions and a choice model. The framework is applied to a case of a university campus in Madr...


What makes travel pleasant and/or tiring? An investigation based on the French National Travel Survey
The 2007–2008 French National Travel Survey (FNTS) included questions about the trip experience for a random subsample of the respondents’ daily travel, offering a rare opportunity to examine a national profile of attitudes toward travel. This study analyzes the self-reported (mental and/or physical) fatigue associated with the selected trip, and its (un)pleasantness. Only 8 % of trips wer...
Complex diagnostics of the technical condition of a monolithic "diaphragm-wall" after long-term conservation
A procedure and results of monitoring of the technical condition of a monolithic reinforced-concrete “diaphragm wall” after seven years of conservation are described. Correspondence is confirmed between the physical and design parameters of the diaphragm. Lack of disruptions in the continuity in the construction of the diaphragm is established from data of multi-channel seismoacoustic measu...


A Drop-Bar Setup for the Compressive Testing of Rubber-Like Materials in the Intermediate Strain Rate Range
Only few works have been focused on soft materials at medium strain rates. In the present paper, we propose a new experimental setup to investigate the compressive response of rubber-like materials in the range of intermediate strain rates, such experiments being difficult to conduct with conventional mechanical frames or traditional Hopkinson bar technique. The new apparatus consists in a hybr...
High-Temperature Split-Hopkinson Pressure Bar with a Momentum Trap for Obtaining Flow Stress Behaviour and Dynamic Recrystallisation
In hot forming processes at elevated temperatures like wire rolling, microstructural changes such as repeated dynamic recrystallisation and grain growth occur. An experimental method to obtain the flow stress behaviour and to capture the recrystallised microstructure for materials subjected to large deformations, high temperatures between 900 and 1200 °C and high strain rates around 5000 s...


An adaptive neuro-fuzzy inference system for predicting unconfined compressive strength and Young’s modulus: a study on Main Range granite
Engineering properties of rocks such as unconfined compressive strength (UCS) and Young’s modulus (E) are among the essential parameters for the design of tunnel excavations. Many attempts have been made to develop indirect methods of estimating UCS and E. This is generally attributed to the difficulty of preparing and conducting the aforementioned tests in a laboratory. In essence, this stud...
Borehole seismic surveys for the mechanical characterization of a calcarenite cliff in the area of Ispica (southern Sicily)
In this study, we investigate the mechanical properties of the substrate underlying the historical Franciscan Friars Minor convent of Ispica (southern Sicily). The convent, where new fractures recently occurred, is located on top of a calcarenite cliff formed along one of the planes of the regional Pozzallo-Ispica-Rosolini normal fault system. Taking advantage of three existing mechanical drill...

Rock cuttability assessment using the concept of hybrid dynamic hardness (HDH)
Hybrid dynamic hardness (HDH) is an indentation-based rock hardness concept which is a formulated combination of the surface rebound hardness and the deformation ratio of a given rock material. This new concept was recently put forward by one of the present authors and was successfully applied to estimate the uniaxial compressive strength of carbonate rocks. So far, there has been no applicatio...
GIS and limit equilibrium in the assessment of regional slope stability and mapping of landslide susceptibility
Slope stability analysis is an enduring research topic in the engineering and academic sectors. Probability-based analysis is the most popular method for evaluating a wide range of natural slope instability risks, but the lack of landslide data limits its application. A new method of regional slope stability analysis is presented that combines spatial analysis and two-dimensional slope analysis...

Inverse Identification at Very High Strain Rate of the Johnson–Cook Constitutive Model on the Ti-6Al-4 V Alloy With a Specially Designed Direct-impact Kolsky Bar Device
In the present work, an inverse identification of the Johnson–Cook constitutive model is performed on the titanium alloy Ti-6Al-4 V at three strain rates until about 2·104 s−1 (till about 1.1·104 s−1 of plastic strain rate) on a specially designed direct impact Kolsky bar device. First, the design of such a device must meet several criteria, and is shown to be the solution of an o...
Experimental Study and Numerical Modelling of Creep and Stress Relaxation of Dielectric Elastomers
Dielectric elastomers (DEs) are gaining acceptance as potential actuator materials because of their exhibition of a large amount of deformation when stimulated by electrostatic forces. However, time-dependent behaviour such as creep and stress relaxation still pose a great challenge for the design, modelling and control of the DE-based actuators. In this work, attempts are made for experimental...

Rock Failure and Crack Propagation Beneath Disc Cutters
Analyses of rock failure mechanisms beneath disc cutters are presented. Full-scale cutting tests are conducted to assess the global energy input in comparison with rock chips and excavated volume. Small-scale cutting tests are subsequently used for macro- and microscopic analyses of rupture modes and crack propagation. A high spatial resolution allows to obtain pictures of crack networks in dif...
Random Forest Based Coarse Locating and KPCA Feature Extraction for Indoor Positioning System
With the fast developing of mobile terminals, positioning techniques based on fingerprinting method draw attention from many researchers even world famous companies. To conquer some shortcomings of the existing fingerprinting systems and further improve the system performance, on the one hand, in the paper, we propose a coarse positioning method based on random forest, which is able to customiz...
Vehicle Velocity and Roll Angle Estimation with Road and Friction Adaptation for Four-Wheel Independent Drive Electric Vehicle
Vehicle velocity and roll angle are important information for active safety control systems of four-wheel independent drive electric vehicle. In order to obtain robustness estimation of vehicle velocity and roll angle, a novel method is proposed based on vehicle dynamics and the measurement information provided by the sensors equipped in modern cars. The method is robust with respect to differe...
Evaluation of the seismic behavior factor of reinforced concrete frame structures based on comparative analysis between non-linear static pushover and incremental dynamic analyses
The seismic behavior factor R (noted q in the european seismic design code, the Eurocode 8) of reinforced concrete frame structures is evaluated based on comparative analysis between non-linear static pushover and non-linear incremental dynamic analyses. For this purpose, three-, six-, and nine-storey reinforced concrete frame structures, considered as low-, medium-, and high-rise frame, respec...