Analysis on Technical Regulations for Steel Structure of Portal Frame Light House
The arrangement of the support is described in a special section in the technical specification of the steel structure of the portal frame light house. It should be specially noted that in the opening between the columns, the lateral support of the roof should be set at the same time to form the geometry. The system, and the inter-column support should be set along the full length of the column, which should be implemented in the actual engineering design. I went to the site of the damage after the windstorm and saw that some of the portal frame buildings were staggered due to the need of passage or door opening, and the inter-column support and the lateral support of the roof were staggered, or the inter-column support was only set to the top of the crane rail. The portal frame has suffered varying degrees of damage. In the design of the portal frame column foot, only when there is a high-tonnage crane, that is, when the horizontal horizontal displacement is difficult to control, it is designed to be just connected to the column foot, and is generally designed as a hinged column foot. In areas with high wind pressure, due to the large horizontal shear force at the end of the column and the small thickness of the portal frame member, the column end should be checked according to the requirements of the steel structure of the portal frame light house steel structure. Shear capacity is measured to determine if the column end web needs to be reinforced. In addition, since the anchor bolts are not used to support the horizontal force at the bottom of the column foot, this horizontal force is borne by the friction between the bottom plate and the concrete or by setting the shear key, and in the area where the wind pressure is large, the weight of the portal frame is lighter. The friction between the bottom plate and the concrete is often insufficient to bear the horizontal shearing force of the bottom of the column. It is necessary to set the shearing key to bear. For the steel column with inter-column support, it is necessary to consider setting the anti-shearing key and the anti-shearing key in the vertical and horizontal directions. The depth of the buried concrete is not less than 100mm. Most of the light portal frame foundations are designed as independent column foundations or pile foundation foundations with short columns. Therefore, no matter whether the rigid frame legs are designed to be hinged or just connected, the foundation has bending moments. For the pile foundation, it can be designed as a multi-pile cap, which resists the pulling force of the pull-up force and the bending moment generated by the wind suction force by the pull-out resistance of the pile; for the independent column foundation, firstly, the pressure of the bottom-maintaining brick wall is used. Strengthen the foundation's resistance to pullout and reduce the base eccentricity. Secondly, reduce the foundation eccentricity by increasing the foundation depth and increasing the base area to increase the weight of the foundation and the cover soil, in order to meet the limits of the gauge on the pressure distribution of the base soil, especially the belt. There is a limit on the earth pressure distribution of the base of the plant with a crane. When performing the pull-out check calculation under independent basic wind suction, it should be noted that the sub-factor of the basis weight, weight and cover weight is 1.0, and due to the existence of the foundation top tensile stress, regardless of whether the foundation bottom is separated from the foundation, Press the negative rib on the top of the base. The purlins are the main components of the roof, and the damage of the purlins will cause damage to the roof panels and roofing systems. Under the action of wind suction, the design of the purlin should pay special attention to the stability calculation of the lower flange of the purlin under the action of wind suction, and the partial coefficient of dead load is 1.0. At the same time, due to the large wind pressure of the cornice and ridge, and the rigid frame The beam is pressed by the wind under the action of the wind suction, so the arrangement of the beam at the rake and the ridge of the rigid frame should be properly encrypted to enhance the lateral stability of the frame. Therefore, the portal type light steel rigid frame is a structural form that is being widely used and continuously promoted. The light weight is determined by its own weight, but as long as it is in the design and construction process, it can follow the specifications. The design and construction requirements of the regulations can improve its wind resistance and reduce losses in the typhoon. Twin Screw Barrel,Twin Screw And Barrel,Double Screw And Barrel,Extruder Twin Screw And Barrel Zhoushan Jinmao Machinery Manufacturing Factory , https://www.jinmao-machinery.com