Introducing Australia’s first hybrid testing facility for performance-based assessment of structures

Hybrid simulation is a cost-effective cyber-physical testing technique, in which computational models and physical components are integrated at run-time. This method can be viewed as conventional finite element analysis, where physical models of some portions of the structure are embedded in the numerical model. In such a way, the errors related to the simplification of the theoretical modeling of complex nonlinear structures or subassemblies can be effectively mitigated as they are tested physically in the lab. This paper introduces Australia’s first hybrid testing facility, referred to as the Multi-Axis Substructure Testing (MAST) system, which is capable of simulating the complex three-dimensional time-varying boundary effects on large-scale structural components. The MAST system is unique in Australasia and is capable to serve the research community and practice, nationally and internationally. An application of the MAST system to investigate the performance of a CFRP-repaired limited-ductile RC column under sequential ground motions from linear-elastic response range through collapse is also presented

Pontage fémoro-fémoral croisé avec tunnulisation périnéale sous-scrotale pour une infection grave du triangle de scarpa

Nous décrivons dans cet article une technique de revascularisation des patients ayant une infection de  prothèse vasculaire sus-crurale au niveau dutriangle de scarpa, et qui minimise le risque d'infection récurrente du greffon. Cette technique consiste en un pontage fémoro-fémoral croisé avec un tunnel périnéal sous-cutané loin du scarpa infecté que le tunnel classique sus-pubiensous-cutané ne permet pas. Nous rapportons le cas d'un patient âgé de 52 ans, artéritique, multi-opérés, admis pour infection du scarpa droit sur un pontage  fémoro-fémoral prothétique perméable, le patient a eu une explantation de ce pontage et une revascularisation par un pontage périnéal sous-scrotal veineux loin du site infectieux; l'évolution a été excellente et le pontage est encore perméable après deux ans de suivi. Le pontage fémoro-fémoral périnéal est une procédure exceptionnellement réalisée, mais qui peut constituer une vraie option thérapeutique de revascularisation chez les patients avec une infection du scarpa.Key words: Pontage, triangle de scarpa, tunnel périnéa

Tensile capacity of FRP anchors in connecting FRP and TRM sheets to concrete

This paper investigates the effectiveness of carbon fiber spike anchors as a means of anchoring externally bonded (EB) fiber-reinforced polymers (FRP) and textile reinforced mortar (TRM) sheets into concrete. The investigation employs experimental work, which includes reinforced concrete (RC) columns strengthened with various configurations of EB FRP and TRM sheets connected to RC footings via carbon fiber spike anchors. The fiber spikes have two parts: the anchor part and the fan part. The anchor part is a bar-type dowel component that is epoxy pre-impregnated and inserted into epoxy filled holes within the footing. The fan part was impregnated in-situ and fanned out over and bonded to the EB reinforcement of the column. The connections were tested by pulling the columns upwards, thus applying tensile forces to the connection system. The direct tensile capacity of the anchors was determined for a number of vari- ables including the size and number of anchors, the bonding agent and the type and amount of EB rein- forcement. It is concluded that, with appropriate anchorage into concrete, the carbon fiber spike anchor is an effective anchorage system, and therefore, could be used in a range of strengthening applications to prevent premature delamination of FRP and TRM sheets from concrete surfaces

Etude de la reactivite dans les micelles inverses : phenomenes catalytiques des reactions d'hydrolyse; stabilite des micelles inverses de dioctylsulfosuccinate de sodium en presence de base

SIGLECNRS T 58140 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Iradiasi Sinar Gamma pada Telur Ayam Boiler Sebagai Upaya Peningkatan Keamanan Pangan (Kajian Dosis Iradiasi dan Penyimpanan Suhu 4°C).

Telur ayam broiler adalah salah satu produk hewani yang banyak dikonsumsi oleh penduduk Indonesia, karena nutrisi yang tinggi dan harganya yang terjangkau di kalangan masyarakat. Tingginya kadar protein pada telur tersebut akan dimanfaatkan oleh mikroba patogen yang akan menyebabkan telur mudah rusak serta tidak aman untuk dikonsumsi. Pemerintah melalui badan standarisasi nasional telah membuat peraturan untuk melindungi konsumen, dalam mengkonsumsi telur ayam boiler segar, melalui Standar Nasional Indonesia (SNI) No. 3926 tentang batas maksimum cemaran mikroba pada telur segar, dimana jumlah Total Plate count (TPC) maksimal untuk produk telur ayam boiler segar adalah 1 x 105 cfu/g, jumlah bakteri Escherichia coli maksimal 1 x 101 MPN/g, dan tidak boleh mengandung Salmonella. Untuk mengeliminasi mikroba tersebut dapat dilakukan dengan cara pengasinan, pemasakan, atau refrigerasi. Akan tetapi metode tersebut dapat merusak nutrisi dan organoleptik, sehingga diperlukan metode yang lain, untuk menjaga nutrisi serta menghilangkan mikroba patogen sehingga tetap aman untuk dikonsumsi. Salah satu teknik mengeliminasi mikroba yang sedang dikembangkan saat ini adalah dengan menggunakan metode iradiasi sinar gamma. Metode ini menggunakan gelombang elektromagnetik untuk menghilangkan mikroba yang ada pada bahan pangan. Iradiasi makanan bertujuan untuk menghambat atau mencegah petumubuhan mikroba patogen, sehingga diharapkan aman untuk dikonsumsi. Metode iradiasi sinar gamma akan lebih efektif jika dikombinasikan dengan penyimpanan suhu dingin. Penelitian ini bertujuan untuk mengetahui pengaruh iradiasi dan suhu dingin terhadap jumlah bakteri patogen pada telur ayam boiler. Penelitian ini mengunakan telur segar yang kemudian diiradiasi dengan dosis 0, 1, 2, dan 3 kGy dan disimpan pada suhu ±4°C. Metode penelitian yang digunakan adalah deskriptif kuantitatif dengan 2 faktor. Faktor 1 Terdiri dari 4 Level yaitu dosis iradiasi sinar gamma dan faktor II terdiri dari 2 Level yaitu waktu penyimpanan pada suhu dingin, sehingga didapatkan 8 kombinasi perlakuan. Setiap perlakuan diulang sebanyak 3 kali ulangan, kemudian dibandingkan dengan hasil uji mikrobiologi pada Standar Nasional Indonesia (SNI). Berdasarkan hasil penelitian total mirkoba kontaminan pada analisa angka lempeng total mengalami penurunan dari 5,5 x 106 cfu/g menjadi 1,8 x 101 cfu/g, bakteri Escerichia coli dari 64 MPN/g menjadi 3 MPN/g, dan Salmonella tidak ditemukan pada sampel yang diuji. Penelitian ini juga menunjukan, semakin tinggi dosis iradiasi sinar gamma yang dipakai, jumlah mikroorganisme yang ada pada sampel uji semakin menurun

The strengthening of post-tensioned slabs using CFRP composites at White City, London

Abstract not available

Investigation into CFRP laminate anchorage systems utilising bi-directional fabric wrap

The increasing challenges faced to strengthen existing concrete bridges and infrastructure has resulted in intensive research and the introduction of carbon fibre reinforced polymers (CFRP). It has been demonstrated that failure of concrete structures retrofitted with CFRP usually occurs by de-lamination of the CFRP from the concrete substrate. As a result, the introduction of CFRP anchorage systems to increase the efficiency of CFRP solutions remains an area of great potential. What follows is the third paper of a series presenting the results of six types of CFRP anchorage solutions. Earlier publications highlighted the benefits of uni-directional fibres and of mechanical substrate strengthening. Together these formed anchorage types 1, 2 and 3 designed to enhance CFRP anchorage performance. The present paper focuses on the application of CFRP bi-directional fabric to the ends of CFRP laminates in arrangements that form the remaining anchorage types 4, 5 and 6. The benefits of the bi-directional CFRP anchorage system has resulted in significantly improved: fibre utilisation levels and increased ductility, which in some cases has resulted in laminate rupture. The higher CFRP strain levels achieved warrants the adoption of less stringent strain limitations used in design, resulting in both material and cost savings

Investigation into bond behaviour of a new CFRP anchorage system for concrete utilising a mechanically strengthened substrate

Failure of CFRP strengthening systems when applied to concrete structures is usually typified by de-lamination of the CFRP from the concrete substrate. To prevent this type of failure, current standards and design guidelines impose strict limitations on the maximum strain level of the composite material which may be utilised in design. Emerging research has shown that anchoring the ends of the CFRP plates or sheets can result in a significantly higher load/stress being reached before de-bonding occurs. This paper investigates a method of anchoring CFRP laminates by utilisation of a mechanical chase cut into the concrete over the anchorage length. Experiments have shown this to be an effective way to improve the strength of the concrete substrate, resulting in higher CFRP bond strength and improvements in maximum elongations, bond stress, slip and load carrying capacity of the CFRP to concrete joint