Preliminary results of an experimental program on the cyclic response and rotation capacity of steel members

2009 ◽  
Author(s):  
F Iannone ◽  
G Rizzano ◽  
V Piluso ◽  
R Landolfo ◽  
M Brescia ◽  
...  
Keyword(s):  
Experimental Program ◽  
Cyclic Response ◽  
Preliminary Results ◽  
Rotation Capacity ◽  
Steel Members

scholarly journals Cyclic Modeling of Bolted Beam-to-Column Connections: Component Approach

2021 ◽  
Author(s):  
Massimo Latour ◽  
Gianvittorio Rizzano ◽  
Vincenzo Piluso
Keyword(s):  
Mechanical Properties ◽  
Mechanical Model ◽  
Experimental Results ◽  
Experimental Program ◽  
Bolted Connections ◽  
Cyclic Response ◽  
Eurocode 3 ◽  
Component Approach

The work is aimed at the prediction of the cyclic response of bolted beam-to-column joints starting from the knowledge of their geometrical and mechanical properties. To this scope a mechanical model is developed within the framework of the component approach already codified by Eurocode 3 for monotonic loadings.Accuracy of the developed mechanical model is investigated by means of the comparison between numerical and experimental results with reference to an experimental program carried out at Salerno University. The obtained results are encouraging about the possibility of extending the component approach to the prediction of the cyclic response of bolted connections.

scholarly journals Neutral Axis Depth versus Ductility and Plastic Rotation Capacity on Bending in Lightweight-Aggregate Concrete Beams

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3479 ◽  
Author(s):  
Luís Bernardo ◽  
Miguel Nepomuceno ◽  
Hugo Pinto
Keyword(s):  
Concrete Beams ◽  
Lightweight Aggregate ◽  
Neutral Axis ◽  
Experimental Program ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Plastic Rotation ◽  
Rotation Capacity ◽  
Flexural Ductility ◽  
Plastic Rotation Capacity

This article presents an experimental study on the evolution of the neutral axis depth at failure in the critical section with the flexural ductility and plastic rotation capacity of reinforced concrete (RC) lightweight-aggregate concrete (LWAC) beams. For this, the results of a previous experimental program involving RC LWAC beams tested in flexure until failure are used. The variable studies were the concrete compressive strength (between 22.0 and 60.4 MPa and dry density between 1651 and 1953 kg/m3) and the longitudinal tensile reinforcement ratio (between 0.13% and 2.69%). The flexural ductility and the plastic rotation capacity of the RC LWAC beams are characterized by a ductility index and a plastic trend parameter, respectively. The influence of the variable studies, as well as the relation of the flexural ductility and plastic rotation capacity with the values for the neutral axis depth at failure are analyzed and discussed. Some conclusions are drawn which can be useful for the design of RC LWAC beams for flexure. In particular, it is shown that the practical rule of limiting the neutral axis depth at failure to ensure ductile behavior, as used in normal-weight aggregate concrete beams, is also valid for RC LWAC beams.

GLOBAL IMPERFECTIONS AND DIMENSIONAL VARIATIONS IN COLD-FORMED STEEL MEMBERS

2011 ◽  
Vol 11 (05) ◽  
pp. 829-854 ◽  
Author(s):  
VAHID ZEINODDINI ◽  
BENJAMIN W. SCHAFER
Keyword(s):  
United States ◽  
Steel Structures ◽  
The United States ◽  
Sine Wave ◽  
Measured Data ◽  
Experimental Program ◽  
Systematic Bias ◽  
Steel Members ◽  
Cold Formed Steel ◽  
Manufacturing Tolerances

The objective of this paper is to provide the results from an experimental program to measure global imperfections and dimensional variations in cold-formed steel-lipped channel members. Measurements were conducted at seven different manufacturing plants in the United States. A total of 210 cross sections were measured for global imperfections. Each cross section was measured at three locations, and every 305 mm (12 in.) along the length. The data is used to characterize global bow, camber, and twist. The majority of the data exhibits global imperfections well approximated by a half sine-wave. Further, global bow imperfections are shown to have a systematic bias in the direction of bow. The measured data is compared with manufacturing tolerances (e.g., L/384) and assumed imperfection sizes from column curves (e.g., L/960) as utilized in design practice in the United States. The measured imperfections served as justification for tightening manufacturing tolerances in the United States (e.g., to L/960). Dimensional variation of typical cold-formed steel members is also measured and compared with tolerances. The measured data provides much needed input for nonlinear analysis of cold-formed steel structures.

Epoxy Resin Systems for Rapid Repair of Steel Members with Carbon Fibre

2019 ◽  
Vol 951 ◽  
pp. 27-31
Author(s):  
Mike Bambach
Keyword(s):  
Carbon Fibre ◽  
Epoxy Resins ◽  
Steel Surface ◽  
High Strength ◽  
Experimental Program ◽  
Rapid Repair ◽  
Steel Members ◽  
Tension Tests ◽  
Cure Time ◽  
Broad Variety

The repair of steel members with carbon fibre has applications in a broad variety of disciplines. Experimental work in the literature has typically identified high strength epoxy resins to bond the carbon fibre to the steel surface, with requirements of up to two weeks curing at ambient temperature, as recommended by the epoxy manufacturer. However, there may be applications in which repair in the field would require more rapid curing, so as to minimize disruptions to the service of the member or structure. This study presents an experimental program assessing four different epoxy resins for their strength and cure time. Double strap tension tests were undertaken, and the results indicated that certain epoxy resins reached full strength much more rapidly than others, while their strengths varied notably. Recommendations are made with respect to rapid strength repair of steel members with carbon fibre.

scholarly journals Properties of individual X-ray sources: (Invited discourse)

1970 ◽  
Vol 37 ◽  
pp. 107-115 ◽  
Author(s):  
Riccardo Giacconi
Keyword(s):  
Control System ◽  
Attitude Control ◽  
Mechanical Failure ◽  
Experimental Program ◽  
Attitude Control System ◽  
X Ray ◽  
Preliminary Results ◽  
The Past ◽  
American Science

In the past 2 years the group at American Science & Engineering, Inc., including Gursky, Gorenstein, Kellogg and me, has been engaged in a program of rocket launches aimed at the solution of several outstanding questions in X-ray astronomy. Of four rocket launches, one was almost totally unsuccessful due to a mechanical failure; one was only partially successful due to a failure of the ACS (Attitude Control System); and two performed as planned. Notwithstanding the delays induced by this run of bad luck, a considerable amount of data has been gathered and analyzed. The major results obtained in the flights on October 11, 1966, and on February 2, 1968, have been published. It is my intent today to report on preliminary results of a recent flight (December 5, 1968) and briefly summarize conclusions from previous flights, and comment on a few selected topics to which this experimental program may contribute.

Evaluation of the rotation capacity limits of steel members defined in EC8-3

2017 ◽  
Vol 135 ◽  
pp. 11-29 ◽  
Author(s):  
Miguel Araújo ◽  
Luís Macedo ◽  
José Miguel Castro
Keyword(s):  
Capacity Limits ◽  
Rotation Capacity ◽  
Steel Members
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