Electrons that are IOSI from the beam during nom-A operation of a synchrotron radiation source and during a beam dump at the end of 1 mn produce both ionizing radiation and neutrons. This radiation has the potentirl oi damaging sensitive maxials. in particular those that ne:rd to be very close to the beam. In the ~1, ‘ooiers and undulators for the .Wxnced Light Source (ALS) 31 LBL. magnetic mat...

This paper presents a study for identifying damage locations in an idealized steel bridge girder using the ambient vibration measurements. A sensitive damage feature is proposed in the context of statistical pattern recognition to address the damage detection problem. The study utilizes an experimental program that consists of a two-span continuous steel beam subjected to ambient vibrations. Th...

Strengthening of reinforced concrete beams using externally bonded CFRP laminate is the most popular choice. However, premature end peeling of CFRP laminate has been shown to be the main weakness of this method. Development of high shear and normal stresses at the end of strengthening laminate is the key reason to cause end peeling which is not preventable by conventional anchoring system. This...

Load-bearing structures of deck railway bridges with encased filler beams have been used for short and middle spans of a maximum of 24 metres. For over a hundred years they have been designed in cases with little headroom. The first bridges were constructed with no interaction between steel beams and concrete floor slabs, the structural steel working as a bearing element and the concrete in the...

This paper aims to clarify the effect of steel fiber on the flexural toughness of the high performance concrete containing fly ash and nano-SiO2. The flexural toughness was evaluated by two methods, which are based on ASTM C1018 and DBV-1998, respectively. By means of three-point bending method, the flexural toughness indices, variation coefficients of bearing capacity, deformation energy, and ...

The strengthening and repair of existing structures using bonded carbon fiber reinforced polymer, CFRP, laminates has attracted a great deal of attention in the past two decades. Investigations clearly indicate the great potential of this method for restoring the capacity of corroded steel beams and improving their fatigue life. One important issue regarding the use of this technique in strengt...

The Cuckoo search algorithm is a recent addition to metaheuristic techniques. It simulates the breeding behaviour of certain cuckoo species into a numerical optimization technique. Cuckoo birds lay their eggs in the nests of other host birds so that their chicks when hatched can be nurtured by the host birds. The optimum design algorithm presented for moment resisting steel frames is based on t...

This article considers the seismic behavior of beam-to-column joints in steel frames for different bolt arrangements by using of finite element modeling. As the most important beam-to-column joint type, the beam-to-column joints with end-plate is chosen for the analysis. Four different specimens have been analyzed. These models had some differences such as bolt arrangement and the presence or a...

Components were developed for the modeling of industrial furnaces in the iron and steel industry like pusher-type and walking beam furnaces. A cell model on the basis of the dynamic pipe model of the Modelica Fluid Library was designed. The cell model computes the heat transfer between furnace walls, flue gas and the processed steel goods. The radiative heat transfer is modeled by a 1-dimension...

The lead equivalent of X-ray protective barriers are given for both concrete and steel for potentials between 200 an d 1,400 kv . These were determined experimentally u sing a pressure ion ization chamber and an ' _ray tube to which constant potential was applied. Narrow X-ray beam were used. The data obtained are compared with t ho e published by other workers. Data on the relat ive masses ref...