Preliminary Design Of Light Steel Structure Buildings

Portal rigid frame light building steel structure design usually contain preliminary design the detail design of construction drawing design and construction of three stages The preliminary design of the task is to determine reasonable structure scheme; Contains steel structure construction drawing design effect analysis for checking and node component cross section design construction drawings and so on work; Drawing is made on the basis of processing components Below we talk about portal rigid frame light housing for preliminary design of steel structure.

Steel structure preliminary design is given priority to with the conceptual design and scheme optimization, which is a superior function Aesthetically pleasing as the goal of advanced technology of the design phase Generally have the concept of construction engineering design concept in the field of architecture design concept and the concept of structure design of two parts structure design is in front of the preliminary design for the purpose of the project to determine a conceptual design of overall scheme, make structure design of advanced technology and reasonable, convenience of construction, and has a good economy.

Structure concept design is based on the mechanics concept built skilled use material properties and structural system, as well as aesthetic vision engineering consciousness and rich work experience In structural conceptual design process, should consider the overall comprehensive more rapid estimation and decisive decision-making portal frame light steel structure houses design concept is in structural form established under the condition of the preliminary design, so the conceptual design has a certain particularity Combining with the characteristics of portal rigid frame structure, the purpose of the conceptual design is under the condition of meet the building function, make the steel weight of the structure of the advanced technology reasonably safe and reliable To make convenient Short construction period.

In the preliminary design stage, be sure that the layout of the structural system While the basic structure of portal rigid frame structure system have been identified, but due to the rigid frame structure is flat structure system, many technical problems need to pay attention to its space layout.

First is the layout of structure, pay attention to the purpose is to choose the reasonable economic span and column spacing, the span and column is apart from the direct influence of the structure of the economy, should consider when determining span and column spacing frame of steel weight of the unit area, at the same time should also consider auxiliary components such as purlin wall beam of steel consumption.

Second, the structure layout is determined, it must ensure the space stability of the structure, the structure of the space attention by supporting rigid tie bar and stability, to ensure the stability of the space design principle is to make the structure geometry temperature force transmission path clear and quick.

Third, choose reasonable form of node connections and component section, node connection form directly influences the length of the construction period, the choice of the form of cross section structure should be considered material supply situation in region and the level of processing and manufacturing

Plan optimization of the main task is to determine the most reasonable design scheme of reasonable scheme evaluation involves many factors and is a combination of various factors balance scheme selection of the main factors affecting the safety of economy, the security is the premise and foundation of scheme optimization; Economy is the goal of the plan optimization, economic evaluation should be comprehensive consideration, should not only in steel consumption as the only index, and basic processing components and ought to be considered at the same time by the installation of construction period and construction time, and many other factors .

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Qingdao Havit Steel Structure Co.,ltd

The basic principles of Steel Structure design----“Applicability”

 The "Applicable" principle of steel structure system is from the perspective of the functional requirements for steel structure system, steel structure system applicability is closely related to the use function of buildings. Therefore in the design of steel structure , must grasp the following aspects.

1)On the functions and characteristics of the building and environment conditions are fully understand, such as the building is civil architecture or industrial buildings, civil construction is used for exhibition hall or stadium, etc., the industrial building is steel structure Workshop or steel structure warehouse ,steel structure workshop production process effect on the building structure

2)what kinds of requirements for vibration isolation and heat preservation and heat insulation fire anti-corrosion for the building

3)Local environmental conditions and meteorological conditions of Buildings should have enough understanding, such as the building is located in the city suburb village, is located in the valley or coastal, whether for the earthquake zone, and field intensity category, please, whether building area for the heavy rain storm and the thunderstorms sandstorm area, etc

4)Within the building, if there is a special equipment or special loading and how the setting of the crane.

In the preliminary design stage, fully understand the above condition, help to grasp the structure on the macro system Through analyzing related external conditions and internal usage, easy in the solution phase to take corresponding measures, to ensure the structure safety and normal use of the building, to avoid in the preliminary design stage because of the insufficient conditions to understand or negligence, causing subsequent detail design, or construction of rework, or affect the structure of the rational use of, or even bring security hidden danger to the building, in the structure design of the past, painful lessons of this problem.

Building is a complex, its design and construction is completed jointly by multiple professional, professional structure is only one of them, to meet the principle of "suitable", is bound to connect with other multiple specialty structure supporting the different loads, and connected with various professional facilities such as pipeline Professional structure should meet the construction requirement as far as possible in the civil buildings, in a sense, the preliminary design and construction of structure design is synchronized; In industrial construction, should also meet the requirements of process design and architectural design of double; In essence is in order to satisfy the use requirement In general, the structure very few cannot come true, but the problems often arise which structure is not reasonable, such cases, the professional can mutual consultation, construction and make the structure satisfy process .

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Qingdao Havit Steel Structure Co.,ltd

 

Steel Structure Fabrication,Transportation,Installation,Fireproof,Anti-rust

(1) Fabrication: Steel Structure manufacture  including lofting, Number material, cutting, calibration, and many other aspects. Bolt friction surface treatment, anti-slip coefficient should meet the design requirements.Production quality inspection after blasting and painting. General installation 

welds 30 ~ 50mm not coating.

(2) Welding: Welders must pass an examination and obtain  certificate, and must pass the examination in their projects and their scope of accreditation welding. Welding material should match with the base material, full penetration of first , second degree internal defect by ultrasonic testing , ultrasonic testing can not make judgments of the defect, the use of radiography.

(3) Transportation: transport of Steel Structure choose the truck according the lengh and weight of Steel structure , Steel members pivot on the vehicle, both ends of the projecting length and the taping method should be taken to ensure no deformation member, does not damage the coating.

(4) Installation: Installation of steel structure according to the construction  drawing, the installer must ensure structural stability and does not lead to 

permanent deformation. Mounting posts, each section of the column axis positioning axis to be controlled from the ground on a direct quote. Steel 

columns, beams, roof trusses and other major components after installation, they must immediately be corrected and fixed.

Processed by the plant component friction surface, reinspection required before installing anti-slip coefficient, after passing the installation.

(5) Fire and rust:

1) Steel structure fireproof performance is poor. When the temperature reached 550 ℃, the yield strength of the steel at normal temperatures down to about 0.7 yield strength, structure is to achieve its design strength and damage may occur.Design shall be based on fire code regulations, so that the appropriate structures to meet fire safety standards. In the fire safety standards within the required time, should make the steel temperature does not exceed the critical temperature, in order to ensure the normal carrying capacity of the steel structure.

2) steel structure exposed atmosphere, especially atmospheric pollution by severe corrosion, the most common is the rust. This component of the surface must be protected against corrosion to ensure the normal use of steel. Preservative treatment method based on component surface conditions and requirements of life decisions.

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Construction Steel Structure Industry Analysis

Construction Steel Structure is an emerging industry , Construction steel structure refers to use hot rolling , cold-formed or welded sections ( I-beam , H -beam, pressure plate , etc. ) by connecting pieces ( bolts, high strength bolts, etc. ) connections made ​​to withstand loads, load transfer structure with high strength , light weight, good seismic performance , short construction period , high degree of industrialization , less environmental pollution and a series of advantages. Structural features are overloaded , towering , long-span , light , its large load capacity , easy to set up , commonly used in bridges, buildings , towers , gates and other projects.

Steel structure in the process of fabrication , construction and using after completion ,with the superior energy-saving , environmental protection, security , and other aspects of the seismic characteristics , consistent with the principles of sustainable human development . Therefore , as an emerging industry of China’s steel structure construction sector , has been attached great importance to the state, is listed as one of the ten new technologies the Ministry of Construction .

Energy efficiency,Steel structure don’t use of traditional concrete , can significantly reduce the cement , sand and other resource consumption , thereby significantly reducing fossil excavation , refining and transport carbon emissions ; construction to reduce weight to about 40 percent , saving about 30% of the underground pile ; construction process without wooden formwork and scaffolding , if its market share increased 5 percentage points , you can reduce the equivalent of 9,000 hectares of forest timber harvesting ; site to the main assembly of the construction , the construction process can significantly reduce water use, reduce construction on-site noise nuisance, waste water discharge and dust pollution ; reduce sand mining and construction waste emissions ; construction steel residential CO2 emissions of about 480kg / m , compared with traditional concrete carbon emissions 740.6kg / m reduced by more than 35%; CCA lightweight filling the wall with good self- insulation function, traditional brick insulation performance three times , dramatically reducing energy consumption ; while building demolition , steel residential main structural materials recovery above 90% reduction in emissions compared to conventional concrete garbage about 60%.

The cost of steel structure and concrete cost is insignificant . The total investment in a high-rise building projects , accounting for about 50% of the project cost , construction cost accounting for less than 30% of the project cost , and therefore , the proportion of the total investment of steel structure in less than 15 %. Although steel is 10% to 20 % higher than the cost of reinforced concrete , steel structure , lower labor, foundation treatment costs, gotta say steel project cost is slightly higher than the concrete ; If you consider shortening the duration of the rental brought income , short- term loans , the cost of steel and concrete structures will not be much difference .

And speaking on space utilization , generally more than 20 floor building will show the advantages of steel structures , such as a global financial center is to use steel structure , if use reinforced concrete , the underlying space utilization will be very bottom . So consider the effective use of space than the steel structure large concrete ( beams cross-sectional area can be reduced by more than 50% ) , the steel structure of the overall economic efficiency may be higher than the concrete s .

Because of the many advantages of steel structures , steel structure products have been widely used in industrial plants, high-rise and high-rise buildings , residential, large public buildings, terminals, thermal power plant and boiler main frame, road and rail bridges and offshore oil platforms . Detailed construction steel industry and can be divided into light steel , heavy steel , steel and other sub-sectors of space .  http://www.havitsteelstructure.com ; http://www.steelbuildingschina.com ; http://www.steelstructure-china.com