Interconnection of boxed angle compression members

1987 ◽  
Vol 14 (4) ◽  
pp. 534-541 ◽  
Author(s):  
Murray C. Temple ◽  
David C. McCloskey ◽  
Joseph M. Calabrese
Keyword(s):  
North American ◽  
Structural Design ◽  
Failure Load ◽  
Slenderness Ratio ◽  
The Third ◽  
The North ◽  
Result Concern ◽  
Ratio Size ◽  
Compression Members ◽  
European Standards

Recent research on the interconnection of starred angle compression members has indicated that the requirements for the interconnection of such members as contained in North American standards are not adequate. It was also determined that the North American and European standards vary greatly in their requirements for the interconnection of double angles. As a result, concern was expressed with regard to the requirements for the interconnection of boxed angles.A total of 27 boxed angle compression members were tested. The slenderness ratio, size of angles, and number of interconnectors were varied. The failure load and failure mode were noted for each specimen.This paper recommends that two interconnectors be used, one at each of the third points, in all boxed angle compression members. Key words: angles, buckling, building (codes), columns (structural), design interconnection, boxed angle.

Interconnection of starred angle compression members

1986 ◽  
Vol 13 (6) ◽  
pp. 606-619 ◽  
Author(s):  
Murray C. Temple ◽  
J. Albert Schepers ◽  
D. J. Laurie Kennedy
Keyword(s):  
Critical Load ◽  
North American ◽  
Structural Design ◽  
Theoretical Study ◽  
Experimental Program ◽  
The Third ◽  
The North ◽  
Compression Members ◽  
European Standards ◽  
Shape Changes

The requirements for the interconnection of starred angle compression members contained in North American standards vary greatly from those of European standards. The North American standards, which require only one interconnector for any starred angle made with equal leg angles, are the most liberal. The British standard, on the other hand, is the most conservative.A theoretical study of "slender" starred angles indicates that the buckled shape changes when the number of interconnectors is increased from one to two. There is a corresponding increase in the critical load. The addition of more than two interconnectors has no significant effect on the critical load. An extensive experimental program verified these results. The experimental program also included starred angles that could be classed as being of "intermediate" length.The paper recommends that two interconnectors be used, one at each of the third points, in all starred angle compression members made with equal leg angles. Key words: angles, buckling, building (codes), columns (structural), design, interconnector, starred angle.

scholarly journals Buckling of built-up compression members in the plane of the connectors

1993 ◽  
Vol 20 (6) ◽  
pp. 895-909 ◽  
Author(s):  
Murray C. Temple ◽  
Ghada Elmahdy
Keyword(s):  
Finite Element Analysis ◽  
Slenderness Ratio ◽  
Element Analysis ◽  
The North ◽  
Compression Members ◽  
Compressive Loads ◽  
European Standards ◽  
Equivalent Slenderness Ratio ◽  
Compressive Resistance

An examination of the requirements for the design of built-up compression members in the North American and European standards and specifications reveals a great variation in the allowable maximum slenderness ratio for an individual main member, and also in the determination of an equivalent slenderness ratio. The requirements of the Canadian standard with regard to the determination of the maximum allowable slenderness ratio of a main member between points of connection can be a bit confusing.This research involved a study of model built-up members that buckled about an axis perpendicular to the plane of the connectors. Twenty-four tests were conducted on model built-up members. The theoretical analysis consisted of a finite element analysis of the model built-up struts. In addition, an equivalent slenderness ratio was calculated by several methods. These equivalent slenderness ratios were then used in conjunction with the requirements of the Canadian standard to calculate a compressive resistance, which was compared with the experimental failure load.From this research on built-up members that buckle about an axis perpendicular to the plane of the connectors it was found that at least two connectors should be used, that the slenderness ratio of the main member between points of connection has a significant effect on the compressive resistance, and that Timoshenko's equivalent slenderness ratio when used in conjunction with the Canadian standard gives results that are in the best agreement with the experimental results. Key words: battens, built-up members, compressive loads, connectors, equivalent slenderness ratio.

scholarly journals Learning based on the project entitled "Design and construction of a wooden bridge"

2016 ◽  
Vol 6 (2) ◽  
pp. 135
Author(s):  
Cristina Barris ◽  
Lluís Torres ◽  
Enric Simon
Keyword(s):  
Structural Design ◽  
Failure Load ◽  
Theoretical Calculations ◽  
Project Based Learning ◽  
Course Content ◽  
The Third ◽  
Material Optimization ◽  
Engineering Degree ◽  
The University ◽  
Design And Construction

This article presents the results of a case involving the application of project-based learning carried out with students in the Mechanical Engineering degree program at the University of Girona. The project, entitled “Design and construction of a wooden bridge”, was conducted at the Polytechnic School in the third-year Structures course. This project required students to address, consider and solve different problems related to the resistance of materials, structural calculations, material optimization and structural design. The project also included the building of the bridge based on the calculations made, thus enabling the students to verify the suitability of the theoretical calculations as compared to real results. Finally, a competition was held to reward those teams who obtained the best ratio between the failure load and the weight of the bridge. The main conclusion observed from the implementation of only two editions of this project is the acquisition of the different proposed competences (both specific and cross-curricular) by the students. Finally, it was interesting to note that after completing the activity, the students were observed to be more motivated by the course content.

NASPEM Abstracts

1989 ◽  
Vol 1 (2) ◽  
pp. 171-184
Keyword(s):  
North American ◽  
Washington Dc ◽  
North American Society ◽  
International Conference ◽  
The Third ◽  
The North ◽  
Exercise Medicine ◽  
American Society ◽  
Annual International Conference

These abstracts are from oral sessions presented at the Third Annual International Conference of the North American Society of Pediatric Exercise Medicine held in Washington, DC, Sept. 15–18, 1988.

A Subversive Agent From Colombia

Worldview ◽  
1974 ◽  
Vol 17 (6) ◽  
pp. 29-34
Author(s):  
Denis Goulet
Keyword(s):  
United States ◽  
North American ◽  
Third World ◽  
The United States ◽  
Social Policies ◽  
The Third ◽  
The North ◽  
American Heritage ◽  
The Third World

In a letter to a friend in the United States dated May 16, 1969, a leading Colombian sociologist declared:I have been trying to disattach myself from portions of the North American heritage which I had received, and with which I find myself increasingly at odds. For this reason, I cannot identify myself with any institution of the United States that would uphold or sustain the present economic and social policies pursued toward the Nations of the Third World.

A re-examination of the type area of the Devono-Mississippian Cariboo Orogeny, central British Columbia

1981 ◽  
Vol 18 (12) ◽  
pp. 1767-1775 ◽  
Author(s):  
L. C. Struik
Keyword(s):  
British Columbia ◽  
North American ◽  
Volcanic Rocks ◽  
The Other ◽  
Type Locality ◽  
The Third ◽  
The North ◽  
Early Mesozoic ◽  
Type Area ◽  
North American Craton

Three tectonostratigraphic successions are established from remapping of the area near Barkerville and Cariboo River. The first, of Late Proterozoic to Cambrian sediments, was deposited on the shallow to moderately deep platformal shelf west of and derived from the exposed North American craton. The second is an unconformably overlying Ordovician to Permian sequence of sedimentary and volcanic rocks representing a basinal environment with periodic highs. These packages of sediments were deposited on the North American craton and its western transitional extensions. The third succession, composed of oceanic chert and basalt of the Permo-Pennsylvanian Antler Formation, was thrust eastward over the other two during the early Mesozoic. The three successions were folded, faulted, and metamorphosed during the mid-Mesozoic Columbian Orogeny. The Devono-Mississippian Cariboo Orogeny, which was thought to have affected all of the first sequence and part of the second, could not be documented in its type locality. The geology of the Barkerville – Cariboo River area has many similarities with that of Selwyn Basin and Cassiar platform of northern British Columbia and Yukon.

A REVIEW OF THE NORTH AMERICAN SPECIES OF LINNAEMYA SENS. LAT. (DIPTERA, TACHINIDAE)

1944 ◽  
Vol 76 (10) ◽  
pp. 193-206 ◽  
Author(s):  
A. R. Brooks
Keyword(s):  
North American ◽  
Apical Cell ◽  
Antennal Segment ◽  
North American Species ◽  
The Third ◽  
The North ◽  
Wing Tip

The name Linnaemya has been used in America and to a lesser extent in Europe for a collection of rather distinct elements linked together by the following characters:Large robust forms, 8-15 mm. long; eyes densely haired; antennae large, the third segment truncate at the tip; second aristal segment somewhat elongate; palpi reduced in length, as long as the second antennal segment or reduced to mere papillae; epistoma strongly warped forward, the antennal and oral margin axes about the same length; bend of the fourth vein with a strong appendage, the apical cell open far before the wing tip; abdomen stout, bearing at least one pair of discal bristles on the intermediate segments.

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