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Aggregate interlock in fractured concrete mesoscale models: a novel finite element modelling approach

Jayasinghe Thushara, Gunawardena Tharaka, Mendis Priyan

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e165, 2022

Aggregate interlock is a stress transfer mechanism in cracked concrete. After concrete cracks under tensile loading, crack interfaces can experience significant slip deformation due to the applied crack kinematics. Upon rising slip along crack interfaces, aggregate interlock stresses are generated which transfer shear stress and normal stress. Many experimental programmes and analytical expressions have been developed for several decades. However, a finite element model considering realistic crack surfaces was still not developed. The complexity of developing a FE model lies due to the mesoscopic nature of the problem. In this study, concrete mesoscale models were employed to generate realistic cracked concrete surfaces. Uniaxial tensile fracture propagation in concrete mesoscale models were achieved using Zero-thickness cohesive elements approach. Once cracked concrete FE models are developed, validation of the proposed FE models was conducted against two experimental campaigns. The study comprises the evaluation of the surface roughness index of the cracked concrete surfaces. The FE model predicts secondary cracking under low initial crack widths and mixed mode angles. FE predictions were further compared with Walraven’s simplified formulae, Bažant’s rough crack model, Cavagnis’s aggregate interlock formulae and contact density model and consistence agreement was observed. Finally, strengths and weaknesses of the proposed FE modelling approach for aggregate interlock was discussed and further implementations were also highlighted.

Zmiany cech antypoślizgowych nawierzchni bitumicznej wybranych odcinków badawczych

Waluś K. J.

Logistyka

2014

nr 3

6575--6582

Badania doświadczalne cech kinematycznych ruchu pojazdu wykonywane są z wykorzystaniem szerokiej gamy układów pomiarowych. Urządzenia te dokonują pomiaru zazwyczaj jednej z trzech wielkości: przebytej drogi, prędkości lub przyspieszenia. Parametry nawierzchni opisywane są najczęściej wizualnie, czasami z uwzględnieniem cech środowiskowych. Cechy nawierzchni, środowiska jak i samych opon determinują przenoszenie sil i momentów na jezdnię, co przekłada się bezpośrednio na warunki bezpieczeństwa ruchu drogowego. W artykule przedstawiono pomiary doświadczalne wskaźnika szorstkości nawierzchni, wykonane wahadłem angielskim, na dwóch wybranych odcinkach badawczych.

Experimental studies of the kinematic characteristics of motion of the vehicle is done using a wide variety of measurement systems. These devices measure usually one of three values: distance traveled, speed or acceleration. Surface parameters are described in most cases only visually, sometimes including environmental features. Surface and environment characteristics, and tires it self are determining forces and moments transfers on the road, which translates directly into road safety conditions. Paper presents experimental measurements of surface roughness index, made using English pendulum, on two selected test sections.