With the rapid development of the economy, people's living conditions have been comprehensively improved, the building has become the main place where people live, so that people's living conditions have been comprehensively improved and enhanced, the quality and safety of the building has become the focus of people's attention, the building building construction technology used is mainly reinforced concrete frame structure is mainly not only able to ensure the safety of the building, but also strengthen the quality is the most widely used form of building structure, with years of experience, although there are some achievements, but from the structural design, on-site construction in all aspects of the structure has also revealed many unsatisfactory. With the accumulation of years of experience, although there are some achievements, but from the structural design, on-site construction of each link, but also exposed many unsatisfactory problems. The article mainly through the structural design calculation of the building, concrete construction measures and other aspects of the analysis, comprehensively put forward the design of reinforced concrete frame structure need to pay attention to the problem. Life needs, from the design ideals, multi-storey building design ideas updated, more complex structure, to complete the multi-storey building structure, in the construction technology needs to use reinforced concrete frame structure, only focus on technology, can form different structural creativity, to meet the different design ideas, so that the design ideas are well presented, this type of technology is also currently the most widely used form of technology. Reinforced concrete frame structure is suitable for a variety of structural requirements, and its basic structure is mainly composed of four kinds of load-bearing members, namely, floor slab, beam, column and foundation, and the main beams, columns and foundations form the plane frame, and each plane frame is then connected by continuous beams to form the space structure system. In order to make the building more spacious, it is necessary to reasonably design the building height, to ensure the number of floors, to ensure that the internal space of the building is large enough, millimeters in the construction technology, to be able to be more flexible and reliable from the plane layout, the building function to meet the needs of different uses, only comprehensively ensure that the design is scientific and reasonable, in order to present a high-quality project, so that the building from the concept of structural design into the actual building, to provide a good working and living environment for people. Living environment.

Two, multi-storey reinforced concrete frame structure design method

1. Correctly selected important structural calculation parameters

Structural design is directly related to the quality and safety of the building, structural calculations should be based on the structural design program, according to the prior design of the sketches, the science of a variety of data calculations, so that multi-storey buildings to achieve a certain seismic intensity. The first step is to make sure that the building is safe and secure.

1.1 Beam stiffness amplification factor

The software model used for structural design calculations of the building has some forms, the beam input model mainly presents the rectangular cross-section state, this model does not fundamentally solve the problem of increased stiffness caused by the T-section of the floor, which directly affects the calculation results, resulting in the actual stiffness of the structure is higher than the stiffness coefficient derived from the calculations, and the calculation of the seismic shear force is not enough, the seismic shear force is not enough, but it is not enough. The seismic shear force is not enough, the structure of the millicentury appeared unstable factors, buried many security risks, in order to ensure that the structure is more accurate, in line with the actual needs of the need for the calculation of the beam stiffness to do enlargement, so that the enlargement coefficient of the beam to take 2.0, the edge of the beam to take 1.5, only in this way can be in line with the actual construction situation, to ensure that the building's safety and reliability.

1.2 Structural seismic grade

Structural design, need to take into full account the seismic grade of the building, usually, seismic intensity maintained at 6 ~ 8 degrees, need to be raised by one degree, need to comply with the regional seismic intensity based on the upgrading of the seismic defense, if it is 9 degrees, then the design of the design, must comply with the seismic defense of 9 degrees than the higher standard requirements, only then the design of the building structure to do enlargement processing. Only in this way can the designed building structure meet the local seismic requirements and ensure the stability of the building.

1.3 Design of basic seismic acceleration

Seismic acceleration is the design of the key considerations, mainly based on the seismic intensity standard, if the seismic intensity of 7 degrees, the basic seismic acceleration value can be 0.1g and 0.15g two cases, if the seismic intensity of 8 degrees, the design of the basic seismic acceleration value of 0.2g and 0.3g two cases. g two cases, the calculation, can not be confused, according to the earthquake zone is divided into different, reasonable design and selection, to ensure that the design of the basic seismic acceleration value of the accuracy, if the design is not allowed, it affects the stability of the building, there is the use of the safety hazards, when the earthquake occurs, the building is not able to withstand the magnitude of the gravity.

1.4 Structural cycle discount factor

The infill wall is an important part of the frame structure, is the actual existence of the structural form, which directly affects the actual stiffness of the structure, resulting in the calculation of the stiffness does not match the actual calculations, the calculation of the cycle is greater than the actual cycle, and ultimately, the effect of the seismic effect of the bias of the small, the building structure will be unstable. When calculating the masonry infill wall of the building, the cycle discount factor needs to be in accordance with the infill wall material and the number of good 0.6 to 0.7 number of choices; if the masonry infill wall is less or lightweight blocks, you need to use 0.9 number; for those pure frame structure calculations without the side walls, you can design the cycle without discount processing, to ensure that the design structure is in line with the actual construction.

2 Multi-storey frame structure design requirements

2.1 Strong shear and weak bending shear wall design

To comprehensively avoid the phenomenon of shear damage, and to further enhance the basic ability of the seismic wall deformation, we face the design of the seismic wall with a long cross-section, we must reasonably utilize every aspect of the design, especially the hole needs to be set up with a weak connecting beam, which would enable the wall to be divided into small openings Wall, multi-limb wall or single-limb wall form structure, to ensure that each section of the wall aspect ratio size 2. In order to ensure that the actual effect, it is necessary to do a good job of shear wall stiffness calculation of the stiffness of the connecting beam in the design, so that the connecting beam can form a plastic hinge without brittle damage to the structure, to ensure that the connecting beam to meet the requirements of the basic data of strong shear and weak bending, to ensure that bending resistance is reduced by the reduction of the stiffness of the connecting beam.

2.2 ? Column weak beam node design

To achieve strong seismic requirements, so that the beam end of the plastic hinge enhancement, to ensure that the column end in the inelastic state, the beam end cross-section bending capacity, the column end cross-section bending capacity enhancement of the magnitude of how much directly affects the strong seismic column end cross-section after yielding plastic rotation capacity, only do not form a "layer sideways movement agency Only without the formation of the "layer side shift mechanism" phenomenon, the column is not crushed. Calculation need to focus on the section bearing capacity calculation, can be artificially, the column design bending moment according to the principle of strong columns and weak beams for some of the adjustment to ensure that the column reinforcement structure is more powerful, to ensure that the beam end of the longitudinal tensile reinforcement reinforcement weakened from the fundamental is to avoid the seismic yielding stage can not form plastic hinges or plastic hinges to transfer to the columns on the phenomenon of the design of the node structure need to ensure that plastic hinges to the beams to move in the span, forming a strong tensile force. The node structure needs to be designed so that the plastic hinge moves inward to the beam to form a strong tensile force.

3 frame structure structure reinforcement

3.1 frame side column column top reinforcement

Multi-storey building is mainly frame structure, according to the basic requirements of the construction of the norms, need to make the beam upper reinforcement extends into the column, and beams underneath to have a part of, but the column corner longitudinal reinforcement completely extends into the beam can not be done at all, only the design and construction is fully compatible to meet the construction requirements. This requires the relevant designers to go deep into the reality and correct the unscientific design way. Horizontal load of frame structure building is very specific to the overturning moment of the structure and the axial force caused by it in the vertical members, and the horizontal load needs to be well grasped and controlled by the structural design. The top of the frame on the wind load requirement coefficient is high, the roof structural load will be transferred to the side column axial force through gravity than the total force of the floor side columns to be small, resulting in the phenomenon of column top eccentricity, the top side column node axial force on the cross-section center of gravity eccentricity distance is greater than 0.5 times the height of the column cross-section.

3.2 Frame pick beam reinforcement

According to the impact of the construction environment, the use of functional requirements, the project is often in the frame beam end of the design of the pick beam, the frame beam load and the actual load value of the pick beam is not the same, there is a certain degree of variability, the frame beam and the outside of the pick beam cross-section dimensions will be varied, some designers drawing, will be the framework of the beam of some of the main reinforcement to the outside of the extension of the pick beam, although drawn out of the simple, but in the actual construction of the main reinforcement to the pick beam. Simple, but in the actual construction of the main bar simply can not extend into the pick beam, when the rebar truncation molding, resulting in slow progress. Calculation of the internal force and reinforcement of the column, if the design is not reasonable, it may lead to horizontal load bearing capacity is not in place, for the later use of buried security risks.

3.3 Frame beam and column hoop configuration

The building standards have been clearly defined seismic grade frame beams, columns, hoop encryption zone standards, especially for the minimum hoop diameter and the maximum hoop spacing to do a clear requirement, the document stipulates that the project is often taken to beams, columns, hoop encryption zone to maintain the maximum spacing of 100mm, the maximum spacing of non-encrypted zone hoops to maintain the maximum spacing in the 200mm.

Three, conclusion

Diversification of architectural shapes and architectural functions to meet the needs of people's work and life, only a comprehensive grasp of the design of the difficulties and priorities, in order to continue to solve the construction problems, to ensure that the design and the actual construction of the construction, the construction of high-quality projects.

It is believed that after the above introduction, you have a certain understanding of the design of multi-storey reinforced concrete frame structure analysis. Welcome to visit Zhongda Consulting for more information.

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