earthquakes are one of the most destructive geological disasters to cities and are difficult to effectively prevent. How to effectively resist the damage of earthquakes to buildings and improve the seismic resistance of buildings is one of the most concerned issues in areas with frequent earthquakes.
According to statistical analysis, steel structures have better seismic resistance than reinforced concrete structures and civil structures. This is because the steel structure has high strength, its own weight, its toughness, good plasticity, uniform material, and high structural reliability.
In the earthquake propagation mode, the large surface wave wavelength and strong amplitude are the main factors that cause strong damage to buildings. In areas where earthquakes occur frequently, concrete structure houses with poor tensile properties are very likely to collapse overall under the conditions of seismic wave circulating loads. The steel structure has a strength of about 8 times the strength of concrete and a density of only 3.2 times that of concrete. In buildings of the same size, the steel structure is lighter in weight and bears less seismic energy. In addition, the steel structure has good ductility, and the energy brought by seismic waves can be consumed through deformation, making the steel structure not easy to collapse during large deformation.
Due to the good seismic resistance of steel structures and simple construction methods, steel structures are currently widely used in large factories, venues, super high-rise and other fields. Next, let’s take a look at what factors can improve the seismic resistance of steel structures in steel structure design.
1. Node Connection Design
Steel Structure Node Connection Design is an important link in the entire steel structure design, and it has a direct impact on ensuring the integrity and reliability of the steel structure.
According to the "Steel Structure Design Standard" GB50017-2017, the node design of steel structures should be selected based on factors such as the importance of the structure, stress characteristics, load conditions and working environment. At the same time, the node design should meet the requirements of the ultimate state of bearing capacity, reliable force transmission, and reduce stress concentration.
Steel structure node connection and design method details:
2. Structure selection
When selecting a structure type, in addition to considering the total height and aspect ratio of the structure, it is also necessary to determine the differences in seismic performance and design requirements of each structure type. If a frame structure is used, the high-level frame structure should not adopt a single-span frame structure.
3. Suitable construction site
Suitable construction site plays a great role in exerting the seismic resistance of steel structures. The construction site with flat terrain and hard geology can ensure the seismic resistance of steel structure buildings.
In addition to the above content, in order to improve and ensure the seismic resistance of steel structures, we can also use the steel structure design and analysis software STAAD to conduct seismic load analysis of steel structures.
STAAD is a fully integrated finite element analysis and design solution with good user interface, visualization tools and international design specifications. STAAD can be used to analyze almost all structural types affected by static loads, dynamic responses, soil structure interactions or wind, earthquakes and mobile loads.
In addition to seismic load analysis, what are the specific functions of STAAD? Below, let's take a look at:
1. Analyze gravity and lateral loads.
Design and analyze simple or complex structures for various load conditions, including loads caused by gravity (such as constant and live loads), crossing conditions, and lateral loads including wind and earthquakes. 2. Follow the seismic resistance requirements
designs and designs seismic resistance systems in detail according to relevant building codes to generate seismic loads. Consider these forces when designing elements and designing frameworks and larger structural systems, if applicable. Follow the ductility requirements of the selected design specification when allocating and detailed design elements in proportion to scale. 3. Design and analyze structural model quickly model the entire structure, including deck, board, edge and opening, beam, column, wall, bracket, extended and continuous foot and support. Efficiently automate multiple time-consuming design and analysis tasks and generate useful system and component designs with documents ready. 4. Design and analysis with the help of finite elements uses our most advanced finite element analysis to accurately and efficiently complete the analysis, design and drawing of the entire building structure. Use our fast solver to reduce or eliminate the time waiting for the result. 5. Design beams, columns and walls Optimize or analyze the gravity and lateral loads of beams, columns and walls to quickly obtain a safe and economical design. Confidently generate designs that meet U.S. standards and many international design specifications and building codes. 6. Check the cold-flexed cross-section design Use a comprehensive cold-flexed cross-section library to design lightweight steel components without the need for a separate dedicated application. 7. Design the lateral force-resistant frame Perform earthquake-resistant and wind building code inspections on the oblique support frame and bending frame. Quickly get a safe and reliable design for your structural projects. 8. Design of international standards In your product design, use a wide range of international standards and specifications to expand your business practices and take advantage of global design opportunities. Benefit from the extensive support of international standards and confidently complete your design. 9. Generate design load and load combination uses the built-in load generator to apply the wind and seismic load required by the specification to the structure. Relevant load parameters are automatically calculated based on structural geometry, batches and selected building code clauses without the need for separate manual calculations. Use a load combination generator to combine these transverse load conditions with gravity and other types of loads. 10. Import the cross-sectional drawing shape created in DXF Quickly import the sectional drawings customized in metric or imperial designed in DXF drawings. Or define conventional shapes using simple key dimensions or standards selected from a range of standard libraries. 11. Integrated raft and basic design uses professional application integrated in the analysis main model to design raft and basics. Create design calculations and reinforcement drawings. Use ISM to add design information in the BIM model. 12. Integrated steel structure node design designs steel structure nodes in a single integrated environment. Transfer welding joint shape, component size and combined force to the steel structure node design application directly from three-dimensional analysis. This enables efficient information reuse and reduces the amount of rework caused by structural changes. 13. Generate cross-sectional attribute report Quickly calculate cross-sectional attributes and easily generate detailed reports of custom cross-sectional drawings. 14. Generate structural design document Automatically generate structural design documents, including necessary floor plans and elevation drawings for conveying design intentions. Changes to the 3D model are automatically updated in the document. 15. Shared Structural Model transfers structural model geometry and design results from one application to another, and synchronizes future changes. Quickly share structural models, drawings, and information for viewing throughout the team. 16. Make full use of the international general standard cross-sectional configuration file uses a rich international general standard cross-sectional configuration file library (no additional charges) to complete the structural model. Make the most of global design opportunities. If you have steel structure design and analysis needs, or want to purchase STAAD, please follow the WeChat official account of "Ai Sandi Technology" and contact us. Follow the WeChat official account of "Ai Sanwei Technology" and watch the live broadcast! Get free 7-day free trial of BIM software and 12 BIM software series tutorials, as well as exciting cases and BIM solutions, and send them regularly!
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