Ktisis Community: Σχολή Εφαρμοσμένων Τεχνών και Επικοινωνίας/Faculty of Applied Arts and Communication

Masonry infilled reinforced concrete frames with openings

Fri, 29 Oct 2010 22:58:59 GMT

Title: Masonry infilled reinforced concrete frames with openings

Authors: Chrysostomou, Christis; Asteris, P.G.; Giannopoulos, I.P.

Abstract: This work presents an assessment of the behavior of infilled frames. The feasibility of possible immediate implementation of some recent developments both in analysis and design of infilled frames for practical design is investigated. It is now widely recognised that masonry infill panels, used in reinforced concrete (R/C) frame structures, significantly enhance both the stiffness and the strength of the surrounding frame. However, their contribution is often not taken into account because of the lack of knowledge of the composite behaviour of the surrounding frame and the infill panel. Currently, Seismic Design Guidelines (EC8 - Part 3, FEMA - 440, ASCE 41-06) contain provisions for the calculation of the stiffness of solid infilled frames mainly by modeling infill walls as "diagonal struts." However, such provisions are not provided for infilled frames with openings. The present study, based on available finite element results, proposes analytical equations for obtaining the reduction factor, which is the ratio of the effective width of a diagonal strut representing a wall with an opening over that of the solid RC infilled frame. That will allow the calculation of the initial lateral stiffness of infills when an opening is present. The validity of the proposed equations is demonstrated by comparing our results, against work done by various researchers.

Lecture notes in computer science (including subseries lecture notes in artificial intelligence and lecture notes in bioinformatics): preface

Sat, 29 Oct 2011 22:58:59 GMT

Title: Lecture notes in computer science (including subseries lecture notes in artificial intelligence and lecture notes in bioinformatics): preface

Authors: Buchanan, George R.; Rasmussen, Edie M.; Zaphiris, Panayiotis; Loizides, Fernando

Information seekers' visual focus during time constraint document triage

Sat, 29 Oct 2011 22:58:59 GMT

Title: Information seekers' visual focus during time constraint document triage

Authors: Loizides, Fernando

Abstract: Time-constraints are a commonly accepted limitation to a user's information seeking process. Physical time constraints can cause users to have a low tolerance of time consuming information seeking tasks. This paper examines the effects of time constraints on the document triage process in an eye-tracked lab-based study. The visual attention of three time constraints are reported on. Similarities and differences to previous triage data are also reported on, contributing to an ongoing research investigation of the general document triage process

3D reconstruction of urban areas

Fri, 29 Oct 2010 22:58:59 GMT

Title: 3D reconstruction of urban areas

Authors: Poullis, Charalambos

Abstract: AbstractVirtual representations of real world areas are increasingly being employed in a variety of different applications such as urban planning, personnel training, simulations, etc. Despite the increasing demand for such realistic 3D representations, it still remains a very hard and often manual process. In this paper, we address the problem of creating photorealistic 3D scene models for large-scale areas and present a complete system. The proposed system comprises of two main components: (1) A reconstruction pipeline which employs a fully automatic technique for extracting and producing high-fidelity geometric models directly from Light Detection and Ranging (LiDAR) data and (2) A flexible texture blending technique for generating high-quality photorealistic textures by fusing information from multiple optical sensor resources. The result is a photorealistic 3D representation of large-scale areas(city-size) of the real-world. We have tested the proposed system extensively with many city-size datasets which confirms the validity and robustness of the approach. The reported results verify that the system is a consistent work flow that allows non-expert and non-artists to rapidly fuse aerial LiDAR and imagery to construct photorealistic 3D scene models.