With the movement of duration, some buildings built in the 1950s and 1960s of mainland China, especially steel structure factories, were severely broken and needed to complete the importance, assessment, and reinforcement of importance.
In addition, the continued rapid development of socio -economic and scientific and technological achievements, as well as the gradual improvement of urban planning, the standards of people’s production and living conditions have gradually improved. The needs of production and life need to conduct overall or overall changes based on the current technical standards to understand the new use function requirements.
Detection
Just as Western medicine requires testing and shadowing with patients, Chinese medicine consultation needs to be \”hoped and questioned\”. The original basis of the level is also the basis for identifying existing steel structure performance indicators.
my country’s \”Technical Standards for Architecture Structure Detection\” (GB/T? 50344) stipulates that the detection of building steel structure can be divided into steel structure material performance, connection, component size and deviation, deformation and damage, damage, damage, and damage, and damage, deformation and damage, and damage, and damage, and damage, damage, damage, and damage, and damage, and damage, and damage, and damage, and damage, damage, damage, and damage, and damage, and damage, and damage, and damage. Structure, foundation settlement, and coating work. If necessary, the power test or structural power test of structure or component performance can be performed. The inspection of a specific steel architecture can determine the work content and test items according to the actual situation.
Appraisal
In the process of using the building, not only must they regularly manage and repair regularly, but also to be repaired immediately to complete the complete completion of the architectural design institute Function. On the other hand, there are also a lot of house buildings, or if they are designed, constructed, and handled properly, or they need to be transformed due to changes in their uses, or due to the changes in the ecology, or due to various types of fires and disasters, the structure will cause damage, or It is necessary to extend the life life of the structure, etc., all need to be processed.
To do these tasks well, you must have a practical understanding of the problems of the building in the safety, applicability and thermal factors in order to make safe, reasonable, economical and feasible measures, and to achieve measures. What building safety appraisal provides is the correct evaluation of these issues.
According to the probability ultimate state method, it is reached from the bearing capacity limit state and normal use limit. The reliability identification includes two aspects: safety appraisal and normal use identification.
According to the different scope of applications of the house, the appraisal can be divided into two categories: civil building reliability testing and industrial plant reliability house identification. The corresponding national standards are \”Civil Building Reliability Appraisal Standards\” (GB? 50292) , \”Industrial Factory Reliability Appraisal Standards\” (GBJ? 144), and there are technical standards \”Dangerous House Appraisal Standards\”? (JGJ? 125).
Reinforcement method
1. Welding and rivet connection reinforcement
When welding reinforcement, high temperature will reduce the strength of the mother material in the welding site, and at the same time, the internal defects of the weld will also cause the weld in the weld will also cause the seams to make the internal defects of the welds also cause the seams to cause the defects of the welding to make the internal defects of the weld. New cracks are generated, and the residual stress inside the welding structure will accelerate the development of cracks. When the bolt is connected to reinforcement, the holes in the steel will change the scrap section to form a new fatigue intensity zone to reduce the effect of structural reinforcement.
2. Increase the structure or component stiffness
1) Increase the support transformation into a spatial structure and calculate according to the space structure;
2) Add support to increase the frame rigidity or adjust the framework or adjustment Structural self -vibration frequency, etc., to improve the structure bearing capacity and improve the structural dynamic characteristics;
3) Add support or auxiliary group rods to reduce the length ratio of the component to improve its stability;
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[ 123] 4) Focus on strengthening the stiffness of a column in the array structure to bear most of the horizontal force in order to eliminate other column loads in the tower and other structures. Rigidity.
3, sticky steel reinforcement
Paste steel plates on the surface of the structural surface, and use structural glue to work together to improve the carrying capacity of the steel structure. Because the steel plate is not suitable for processing and forming complicated Product-Characteristics-ADVANTAGES-OF-Flat-Packaging-Room structure and poor corrosion resistance, so the cost of maintenance in the later period is higher.
4. Paste the polymer reinforcement
Paste the composite material in the steel structure damage site, which will be partially carried to reduce the stress of the extrusion injury. After the reinforcement of the paste composite material is reinforced, the structural self -weight and size change are small. The anti -fatigue and corrosion resistance of the composite materials are relatively simple, and the construction is relatively simple, which is suitable for on -site repair.
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