Building structure Light steel structure in the multi-storey building Xia Xinhong Yang Xiao system Multi-layer civil building Yuanda Air Conditioning Co., Ltd. Environmental Research Institute, discusses the design characteristics of multi-story light steel structure, and clarifies the potential of light steel structure applied to multi-story buildings Advantages and good prospects.

The Environmental Research Institute of Changsha Yuanda Air Conditioning Co., Ltd. is a multi-storey comprehensive building and construction method that was completed and put into operation last year. The project is flat and approximately rectangular and regular.

The frame column of the seismic building should be a box-shaped section welded by steel plates, or a hot-rolled or welded steel pipe. The section of the beam is hot-rolled or welded. At present, China's self-produced section steel can basically meet the needs of the design and construction of multi-layer light steel structure. In the selection of materials, the project has basically achieved localization.

塍, the plane construction area is 5500m2, the structure of each layer is flat and arranged l, the A area is connected with the ugly area, and the area is independent of the 3 two areas. Both the inner and outer walls are made of lightweight wall panels, which is the first multi-storey light steel structure in Changsha.

There are 3.0, 1 towers; 3 districts, the districts are all layers, and the floor is 3.8 claw mountain roof is curved. For the steel frame structure support system, the cast-in-situ reinforced concrete slab combination floor 30 of the profiled steel plate adopts a light roof, an independent foundation under the reinforced concrete column, and a non-prestressed cable sling suspension system.

1 Structural system design 1.1 Structural selection design adopts light steel frame structure system, adopting the column-through type node approach.

The frame system is used in the structure of multi-layer light steel. When the building plane is a regular rectangular plane, the frame structure is often composed of a plurality of orthogonally connected frames which are parallel to each other in the longitudinal and lateral directions, so that the connection structure can be simplified and the column-through type node method is adopted. When the building plane is non-rectangular, it is composed of non-orthogonally connected frames in multiple directions, and the beam-column joints at the intersection are more complex, forming a special-shaped node, and even have to use the beam-through node as the 1.2 beam. The design of the column system is arranged as a general primary and secondary beam system, the secondary beam spacing is 3, the frame column is made of hot-rolled seamless steel pipe, and the beam is hot-rolled H-shaped steel. The frame is designed with a rigid connection in both the vertical and horizontal directions, and strong bolts are used in the field connection. The joint connection between the main beam and the secondary beam is adopted, but the primary and secondary beams with the cantilever are designed according to the rigid connection. The combination of the floor and the steel beam is not considered when designing the primary and secondary beams. The 13-story roof is supported by a curved steel truss, the curved truss end is connected to the six-zone frame beam, and the other end is connected to the inclined column.

The design of the secondary beam is a very important part in the design of the beam-column system. Because the secondary beam is not the main component in the light steel structure, the number of secondary beams is the largest of the steel structures, accounting for the amount of steel used in the structure. . The ratio is not small, and proper layout also contributes to the integrity of the structure and the transfer of loads. The connection structure at both ends of the secondary beam should be simplified during design. In addition to the cantilever beam at the end, the secondary beam should be hingedly connected with the main beam and form a simple-supported composite beam with the floor to increase the bearing capacity of the beam and reduce the span of the beam. Although the continuous composite beam can reduce the beam or connect the steel cover plate on the upper and lower flanges of the steel beam, it will increase the welding workload. Mesh beams or well-beam structures are less used in multi-layer steel structures, and the reason is basically the same as that of the above-mentioned continuous beams. Under normal circumstances, the spacing of the secondary beams mainly depends on the bending capacity and deflection value of the profiled steel plate during the construction phase. Therefore, if a profiled steel plate with a ribbed rib is used, the secondary beam spacing can be increased. The secondary beam spacing is 33.5 slabs, and the profiled steel plate is selected from the 3 boundary type produced by 09. The total thickness of the slab is 151. Because the total length of the slab is 85 stomachs and there is no expansion joint, the road is placed along the transverse direction at the middle position. Lightweight roof panels are used in the ugly 0 zone.

Multi-layer light steel structure floor coverings are generally used to form a profiled steel plate composite floor formed by pouring concrete on a profiled steel plate, and a stud is connected between the profiled steel plate and the steel beam. There are two considerations for the effect of the profiled steel plate during design. 0 is only used as a permanent template. Therefore, fire prevention is not considered. As a permanent formwork and as a tensile reinforcement at the bottom of the plate, it is necessary to consider fire prevention. If the combination of steel beam and floor slab is considered during design, the bearing capacity and overall stability of the beam can be significantly improved, and the beam can be effectively reduced. In the construction stage, the steel beam without the combined beam can also be used as the load-bearing beam for construction. Set temporary pillars and construction facilities. Although the overall rigidity of the steel and concrete combination floor is weaker than that of the reinforced concrete floor, the floor and the steel frame are mainly connected by shearing parts. However, by reasonably arranging the floor support, the rigidity of the floor can still be considered to be sufficiently large, in line with the plane. The rigidity is infinitely larger than that of the large opening on the floor. The length and width of the building are relatively large and the structure is staggered. The use of rigid slabs assumes a large error. It is worth noting that if the composite slab is used as the elastic slab unit to participate in the overall structural calculation, the anisotropic thickness of the composite steel slab and the cracking of the slab should be considered comprehensively, and the thickness of the actual slab should be appropriately reduced. .

1.4 Support system and suspension system design In order to strengthen the lateral stiffness of the multi-story steel structure, resist horizontal loads and earthquakes, the vertical support system is usually arranged in the wall plane by channel steel or angle steel. It can be arranged in one direction or two directions in the longitudinal direction as required. The support is hinged to the frame and is designed by lever or lever. Considering the arrangement of the doors and windows, the parental single slanting type herringbone type inverted type boundary type inverted type door type can be used to support and arrange on the plane without affecting the building function.

Under the premise of satisfying the building function, the project is properly arranged, the inter-column support system, position 1.

In order to match the façade of the building, the outer column of the 8th section adopts a slanted column, and the column foot is designed as a hinge support which can rotate around the axis of the paper. The upper end is connected to the frame column by the tie rod and the ground is fixed by the struts. . Flange bolts are provided at both ends of the tension strut to facilitate self-tightening of the strut rods during construction and to adjust the feeding error of the strut rods. In addition, the main entrance is provided with a steel frame awning with a length of 6,1. The bottom end of the awning is connected to the frame beam, and the upper end is connected to the frame column by a tie rod. For the overall arrangement, the bottom end of the awning is designed with the frame beam or A connection that can be rotated longitudinally around the frame beam.

The building structure is calculated according to relevant national standards, and reference is made to the Shanghai Light Steel Structure Design Code. Steel type, 235, welding rod 43. Ground, the basic intensity is 6 degrees, on the class site, the seismic rating is grade.

The calculation and analysis used the 3033 steel structure calculation software compiled by Tongji University, and the general structure analysis software 31 was used for the calculation. Due to the large opening of 14mX6rn in the middle of the floor, the length and width of the building are relatively large. The 30-zone adopts a lightweight roof, so the infinite rigidity of the floor is not used.

The calculation results show that the natural vibration period, the vertex displacement and the bottom mantle shear force of the structure are in a reasonable range, the beam-column design stress does not exceed the specification limit, and from the vibration mode of each vibration mode, the overall structure is rigid. Moderately, the design requirements are well met. It shows that the structural layout section design is normal and reasonable.

According to the calculation results, the size and size of the beam and column are optimized and time-lapse, the frame column seamless steel pipe adopts the middle 219, 12, 27314 and the general case, when the box-shaped section column is used, the beam and column are connected in two directions. Both use rigid nodes. When only the section section of the steel section is used, since the web is thin, the connection between the weak axis direction and the beam is hinged, and the direction of the strong axis is the rigid connection type. The node experiment shows that the relationship between the bending moment and the relative rotation angle in the general node is neither completely rigid nor fully articulated, but a nonlinear connection state. To simplify the calculation, it is generally assumed that the beam-column joints are fully rigid or fully articulated. The just-connected node can be designed as a full-welded node bolt-welding hybrid node and a full-bolt joint node according to actual needs.

The beam-column connection uses rigid joints in both directions, and a steel ferrule is added to the hot-rolled seamless steel pipe column in the joint zone to ensure the reliability of the rigid connection.

The rigid node approach is detailed 2, which not only avoids welding on the site, but also avoids the maximum position of the bending moment, thus making the node structure simple.

3.2 The primary and secondary beam connections use hinge points, practice 3, and only practice 2 applies to the secondary beam with cantilever beams. The steel content of the steel-bearing steel plate for the project is 578 7 12, which is calculated according to the current quota standard. The cost of the multi-layer light steel structure including the steel structure is basically the same as that of the cast-in-place reinforced concrete structure. And light steel structure and cast-in-place.

Compared with the reinforced concrete structure, it also has the advantages of light weight, good seismic performance and convenient construction. As long as the design is economical and reasonable, the light steel structure will have a very broad development space in the multi-storey building. The status quo of the foreign multi-layer light steel structure has been widely used is a good proof.

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