Topic
Portal frame
About: Portal frame is a research topic. Over the lifetime, 1778 publications have been published within this topic receiving 7210 citations.
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TL;DR: In this paper, the problem of multi-criteria optimization of structures subjected to stability constraints is considered, where the principal design criteria taken into account in the problem formulation are the two which stipulate: (a) the minimization of the structure material's volume, and (b) the maximization of buckling load.
2 citations
Patent•
07 Dec 2016
TL;DR: In this paper, the authors proposed a vehicle carriage volume measurement mechanism based on a portal frame, and the mechanism comprises an electrical box control system, the portal frame and a first groove-type linear guide rail.
Abstract: The invention discloses a vehicle carriage volume measurement mechanism based on a portal frame, and the mechanism comprises an electrical box control system, the portal frame, a first groove-type linear guide rail and a second groove-type guide rail, wherein the first groove-type linear guide rail and the second groove-type guide rail are arranged in parallel. One end of the first groove-type linear guide rail and one end of the second groove-type guide rail are respectively disposed on the portal frame. The other end of the first groove-type linear guide rail and the other end of the second groove-type guide rail are suspended. The portal frame comprises a substrate, a cross beam, and two vertical frames which are set oppositely. The cross beam is fixed at the tops of the two vertical frames, and the bottoms of the two vertical frames are fixed on the substrate. A walking mechanism is connected between the first groove-type linear guide rail and the second groove-type guide rail in a bridging manner. A first data collection device is disposed below the walking mechanism, and is in communication connection with the installed electrical box control system through a data line. The mechanism can quickly measure the size of goods in a vehicle carriage, is small in measurement error, and is convenient to control.
2 citations
TL;DR: In this article, a study of the inelastic response of a rectangular portal frame with a mass attached to the center of the beam to an impulse load transverse to the plane of the frame was made.
2 citations
Patent•
13 Dec 2019
TL;DR: In this paper, the utility model relates to the technical field of portal frames and reveals a rigid rectangular pipe gantry convenient to install, which comprises a cross beam and two rectangular pipes, second rectangular pipes are movably arranged in the two first rectangular pipes; the lower end in the first rectangular pipe is fixedly connected with a fixed block; a lifting screwrod which is vertically arranged is further arranged further in the second rectangular pipe; lower end of the rod wall of the lifting screw rod is fixed-connected with the fixed block through a first rolling bearing; the upper end of
Abstract: The utility model relates to the technical field of portal frames The utility model discloses a rigid rectangular pipe gantry convenient to install The device comprises a cross beam and two first rectangular pipes, second rectangular pipes are movably arranged in the two first rectangular pipes; the lower end in the first rectangular pipe is fixedly connected with a fixed block; a lifting screwrod which is vertically arranged is further arranged in the first rectangular pipe; the lower end of the rod wall of the lifting screw rod is fixedly connected with the fixed block through a first rolling bearing; the upper end of the lifting lead screw extends into the second rectangular pipe, the lower end of the interior of the second rectangular pipe is fixedly connected with a lifting nut, the lifting nut is in threaded connection with the lifting lead screw, the lower ends of the two opposite sides of the two first rectangular pipes are fixedly connected with lifting motors, and the output ends of the lifting motors are rotationally connected with first rotating shafts through first couplers The portal frame can be installed conveniently, the height of the cross beam of the portal frame can be adjusted conveniently, the portal frame can be moved conveniently, and people can use the portal frame conveniently
2 citations
TL;DR: An optimal design method in cooperated with nonlinear inelastic analysis is presented, which overcomes the difficulties due to incompatibility between the elastic global analysis and the limit state member design in the conventional LRFD method.
Abstract: An optimal design method in cooperated with nonlinear inelastic analysis is presented. The proposed nonlinear inelastic method overcomes the difficulties due to incompatibility between the elastic global analysis and the limit state member design in the conventional LRFD method. The genetic algorithm used is a procedure based on Darwinian notions of survival of the fittest, where selection, crossover, and mutation operators are used to look for high performance ones among sections in the database. They are satisfied with the constraint functions and give the lightest weight to the structure. The objective function taken is the total weight of the steel structure and the constraint functions are load-carrying capacity, serviceability, and ductility requirement. Case studies of a planar portal frame, a space two-story frame, and a three-dimensional steel arch bridge are presented.
2 citations