Portal steel structure optimization design method and steps

The light gantry steel structure has the advantages of low cost, light weight, convenient installation and short construction period. Therefore, it has developed rapidly in recent years and has been widely used in industrial plants. However, in the actual engineering design, since the variable cross-section dimensions of the steel structural members, especially the gantry steel structure, need to be determined through multiple trial calculations, and the design experience of the current design personnel is not rich, the design efficiency is not high. The selection of the cross-section dimensions of the rods is not reasonable, and it is easy to cause uneven stress of the rods in the overall structure. Not only the economic indicators are not ideal, but the safety of the overall structure is not high. Even some projects may have excessive stress on individual members. , exceeding the design strength of the material. Even considering the stress redistribution of the steel structural material after plastic deformation, there are still some potential safety hazards in the overall structure.

Optimization target When designing the steel structure of the gantry, the steel consumption of the structure should be the lowest and the cost should be the lowest under the premise of ensuring the safety of the structure. This is the optimization goal we use to optimize the design method. In practical design, the amount of steel used and the cost of the gantry steel structure are determined by the cross-sectional dimensions of the structural members. Therefore, our optimization goal can be directly simplified to how to choose economical and reasonable cross-sectional dimensions, so that the cross-sectional area is the smallest under the premise of meeting the requirements of strength, stiffness and stability.

The optimization method is similar to the optimization method of the grid steel structure. The optimization method of the gantry steel structure also adopts the asymptotic full stress method, that is, the gantry steel structural member selects and modifies its cross-sectional size through multiple calculations to make it reach or try to It is close to the full stress state until the cross-sectional dimensions of all the bars of the gantry steel structure need not be modified, so that the amount of steel used for the gantry steel structure is minimized to achieve the optimization goal of the lowest cost. The modification of the section size of the component, that is, the optimization of the section size, is to select the section size to maximize the bending resistance torque of the section in the plane and the plane, and the section area is the smallest, that is, under the external load. The section size should be selected to meet the design strength requirements of the strength and stability of the component materials, and to minimize the amount of material used. The specific optimization method is omitted here.

Step-by-step steel structure optimization analysis steps According to the optimization method and constraints, the optimization analysis steps of the gantry steel structure are as follows: Step 1: Determine the initial section size of the gantry structural members. Generally, the software is based on the framing structure. The determination can also be determined by the designer; the second step: the finite element of the variable section member is used to carry out the mechanical analysis of the gantry structure under various working conditions, the load combination, the strength and the stability check; the third step: according to the actual load effect, each Constraint conditions, using the full stress section optimization method to re-optimize the cross-sectional dimensions of each member of the gantry structure; the second and third steps above can be repeated and repeated, and the optimization is selected once every cycle until the selected section size and Once the cross-section dimensions are exactly the same. The fourth step: check the deformation of the beam and column of the gantry structure and meet the requirements of relevant specifications. If it is not satisfied, optimize the cross-section size by referring to the section full-stress optimization method according to a certain proportional parameter, and repeat the second and third steps. Optimized until the point deformation of all components of the gantry steel structure meets the specified requirements. The cross-section size is optimized for full stress, and the number of cycles is large. Generally, it can converge above 10 times, and the cross-sectional size of the gantry stiffness meeting the deformation requirement is less optimized, and generally 1-3 times can meet the requirements.

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Characteristics and Advantages

(1) Intelligent control design: adjustable main parameter and secondary parameter automatically according to the weight of door leaves;

(2) Low noise: Special static sound track, integration of motor, worm-gear and retarder.

(3) Anti-clamping function: automatically reverse when meeting barriers;

(4) Unique electronic motor lock: the motor will lock up when the door is forced to open.(controlled by remote or switch)

(5) Tighten force: seal door when closed, power consumption approximately 10W under standby;

(6) Advanced brushless motor(36V,100W) can automatically adopt different heavy door leaves;

(7) Bi-doors inter-locking: one of the door leaves always remains closing;

(8)Safety sensor terminal: sensor stops working when door closed;

(9)Unique coating technology: never rusty;

(10)Easy and convenient to install;

(11)Working Process: when the door leaf closes to the right place, the door leaf will slightly shift to the door frame and the ground. The rubbers on the four sides of the door leaf will completely combine with door frame and ground, which ensures air tightness. When the door is open, the rubbers will separate from door frame and ground, which avoids contraction on the ground.

Technical Specification

Technical Details:

(1) Rubber lining sealing technology combined with V groove on the guide rail enables the door completely sealed when the door closed;

(2)Special door body location technology. Semicircular surface beam on the ground matches with the V style groove at the bottom of door leaf, which stop the door from swing and make sure it moves stable and smooth;

(3) The door body decorated with matte stainless steel or spray surface, and on the middle and both sides with sealing stripes to ensure the hermetic effect.

(4)Feet sensor switch applied to avoid contagion;

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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfhighspeeddoor.com