Recent advances in nonlinear analysis of reinforced concrete structures have been based primarily on fiber-based discretization of the member cross section at locations of expected inelastic action. However, the accuracy of a fiber-section model is almost entirely dependent on the ability of constitutive material models to represent the overall inelastic behavior of the member. The postyield re...

The paper presents a new analytical model to study the evolution of radial cracking around a corroding steel reinforcement bar embedded in concrete. The concrete cover for the corroding rebar is modelled as a thick-walled cylinder subject to axisymmetrical displacement constraint at the internal boundary generated by expansive corrosion products. A bilinear softening curve reflecting realistic ...

A damage-plasticity constitutive model for the description of fracture in plain concrete is presented. Two approaches, the local model comprising the adjustment of the softening modulus and the nonlocal model based on spatial averaging of history variables, are applied to the analysis of a concrete bar subjected to uniaxial tension and to a three-point bending test. The influence of mesh size a...

This paper covers the expansion of new concrete containing recycled aggregates (RCA) produced from bridge barriers suffering different levels damage due to alkali-silica reaction (ASR). RCA sourced high-deterioration a higher than natural aggregate or low-deterioration concrete, although difference is not high. The lab-prepared cylinders with was that cores extracted old elements. standard acce...

In the framework of an extended chromomagnetic model, we systematically study mass spectrum $S$-wave $qQ\bar{Q}\bar{Q}$ tetraquarks. Their spectra are mainly determined by color interaction. For $qc\bar{c}\bar{c}$, $qb\bar{c}\bar{c}$ and $qb\bar{b}\bar{b}$ tetraquarks, interaction favors color-sextet $\ket{(qQ)^{6_{c}}(\bar{Q}\bar{Q})^{\bar{6}_{c}}}$ configuration over color-triplet $\ket{(qQ)^...

We describe fully self-consistent N-body experiments of barred galaxies with massive halos. A rotating bar is braked through dynamical friction with the halo, which occurs on a short time scale when the central density of the halo is high. On the other hand, friction is weak in a model with a central halo density low enough that the disk dominates the rotation curve in the inner parts; this mod...

Informal awareness and casual interaction tools are intended to help overcome some of the disadvantages that face distance separated knowledge workers by providing some of the subtle awareness cues and opportunities for casual interaction that are present in co-located settings. The design for such tools is usually bottom up, based on required feature lists. This paper takes a topdown approach....