Showing papers on "Portal frame published in 1986"
Patent•
28 Aug 1986
TL;DR: In this article, a compound portal frame extrusion profile is fabricated by means of a cooperative mechanical clamp assembly structure provided integral to a set of separate lineal portal frame profile extrusion components.
Abstract: A compound portal frame extrusion profile of that type employed in the manufacture of insulated portal frames for windows or sliding doors and the like, wherein the compound portal frame profile is fabricated by means of a cooperative mechanical clamp assembly structure provided integral to a set of separate lineal portal frame profile extrusion components and a fabrication method is employed based on the utilization thereof which enables the interim lineally aligned interlock connection of the separate portal frame profile extrusion components, in turn being of either two dissimilar colors or materials or a combination thereof respectively for the interiorly and exteriorly outward facing finished compound portal frame extrusion profile component members, to thus form an intercommunicating resin receiving trough for containing and supporting the progressive injection deposit therewithin of a thermally non-conductive resin-bonding material by which is formed a structural interlock connection joinably between the two separate lineal portal frame profile extrusion components to thereby produce the compound portal frame extrusion profile, wherein thereafter upon a lineal removal of a portion of a sidewall of the previously formed resin receiving containment trough to in turn form a continuously extending lineal gap in the trough sidewall of the structural interlock connection it then also functions as an interposed thermal cavity barrier to substantially reduce differential heat transfer between the interiorly outward facing and exteriorly outward facing joined portal frame extrusion profile component members when the finished compound portal frame extrusion profile hereof is applied in window or sliding door portal frame use.
16 citations
Patent•
03 Apr 1986
TL;DR: In this paper, a traveling type welding machine arranged on the lift of a portal frame was used to improve an efficiency and safety by vertically locating the box column loaded on a raising and felling device.
Abstract: PURPOSE: To improve an efficiency and safety as well by vertically locating the box column loaded on a raising and felling device and by performing an automatic welding of a diaphragm by using the traveling type welding machine arranged on the lift of a portal frame. CONSTITUTION: The frame 17 ascending and descending along a main column 1 and the automatic welding machine moving in the horizontal direction along the main beam of the frame 17 are provided on the front face of the portal frame composed of a pair of main column 11 and sub-column 12 and plural work platform supporting frame 14. A box frame 30 is then raised by actuating a driving device 32 after binding by horizontally loading plural box columns 1 on the box frame which is located at the horizontal position. With the vertical standing of the box column 1 the prescribed welding is performed after positioning the automatic welding machine by driving the frame 17 further by advancing the work platform 15 located on the supporting frame 14 according to the position of the diaphragm 2 to be welded. The box column can thus be safely welded with good efficiency. COPYRIGHT: (C)1987,JPO&Japio
12 citations
TL;DR: In this article, an efficient algorithm is developed for optimum plastic design of low-rise unbraced frames of general configuration based on the static approach of limit analysis without generating the independent mechanisms.
11 citations
TL;DR: In this paper, the in-plane critical strength of thin-walled steel frames was investigated by using seven portal frame models with thin-wall box cross-section and elasto-plastic and second order analysis.
Abstract: This paper reports the in-plane “critical strength” representing the buckling or ultimate strength of thin-walled steel frames subjected to the combined actions of vertical and horizontal loads. To investigate the critical strength of steel frames, an experimental study is performed by using seven portal frame models with thin-walled box cross-section. The critical strengths of portal frames are also inquired on the basis of elasto-plastic and second order analysis including the approximate method for evaluating the local buckling of thin-walled column sections. Through these results, the lower bound of critical strength of frames is clarified in detail. Finally, two approximate methods for estimating critical strength of thin-walled steel frames are proposed herein.
4 citations
TL;DR: In this article, the minimum weight design of lattice portal frames is a nonlinear optimization problem which has been solved by using Rosen's gradient projection method, and the results of a parametric study carried out using the (OPTFRAM) computer program are presented for use in day to day design.
Abstract: Lattice portal frame structures fabricated using hot rolled angle sections for corner leg members laced together are often very economical systems for industrial structures. There is considerable flexibility in the design of such structures in terms of the spacings between and the unsupported lengths of corner leg members, besides the areas of the different elements of the frame. The minimum weight design of these frames is a nonlinear optimization problem which has been solved by using Rosen's gradient projection method. A computer program OPTFRAM, developed for the minimum weight design of lattice portal frames used in industrial structures, is described. This paper also presents the results of a parametric study carried out using the (OPTFRAM) computer program. Regression equations obtained from this study arc presented for use in day to day design.