短肢剪力墙的配箍绿（Hoop green of short limb shear wall）.doc

【精品文档】如有侵权，请联系网站删除，仅供学习与交流短肢剪力墙的配箍绿（Hoop green of short limb shear wall）.精品文档.短肢剪力墙的配箍绿（Hoop green of short limb shear wall）The reinforcement problem of short leg shear wall structure in non seismic area is discussedNon seismic zone 15 storey short shear wall structure reinforcement, all the longitudinal reinforcement of short pier shear wall section rate according to the number and structure design for? How to configure the edge members of stirrup stirrup ratio, to meet the requirements?1. non seismic area 15 layer short leg shear wall structure, all longitudinal reinforcement ratio is best to take 1%,2. the volume ratio of stirrups of the edge component satisfies the minimum volume, the reinforcement ratio is good, that is to say, the stirrup characteristic value is v> 0.1Hoop green of short limb shear wallAccording to the diagram given in the current specification, the use of stirrups is only specified in the shadow areas, rather than by drawing tendons,The reinforcement shall be included in the stirrup volume and stirrup ratio. However, many designers consider pulling the tendons into the volume ratio,The reason is similar composite stirrups, and the columns of the columns are not aimed at shear resistance. To do so, in the steel barThere will be a certain amount of savings. Wall to column stirrups in general high-rise buildings are more common with D12100, of courseWell, after the new specification, it can basically meet the requirements of volume stirrup ratio, so the reinforcing bars in the constraint component are requiredConfiguration can also be configured. But in some cases, for example, if a steel bar is to be used as a stirrup, it may be simply sealedThe closed stirrups are difficult to satisfy.Whether horizontal reinforcement can be included in stirrup volume and stirrup ratio is debated continuously. I don't think that's relevant to the specificationTechnical explanations are directly related, or further, the norm should be responsible for this. Because the specification itself is not clearMake sure that the shear wall sets up the wall column - not to say never, but to the present configurationThe method is not explained because the method of drawing the Lc=0.2Hw is close to the reinforcement of the deep beamBoth design and construction have brought some trouble. I personally recommend not counting the role of horizontal reinforcement because of the levelThe anchoring of the end of the tendon in the dark column may not be able to do well, especially at the end of the bent horizontal section, and some construction unitsEven 10D have to do, not to mention the requirements of the 15D method in xinping.As for the non shadow part of the reinforcement should be how to express? This has to do with the specific practices of the design units.For example, we used to draw non shadow areas, but the workload was huge, and it was usually done with non shadow areasThe reinforcing bars are also made into stirrups, and the second rows of longitudinal bars in the shadow area are trappedTwo times, but not greater than the minimum requirement for structural edge elements, this is an easy question to ignore. Later pickedThe examination center and some other units have been improved and painted only with the size of the non shaded areaDo not draw steel bars, by the construction unit according to flat method 03G101-1 or seismic detail 03G329-1 calculation, using stirrupsOr stretch bar can be.However, it should be noted that when the length of the concealed column is the length of the wall member (the shorter side of the small wall or the corner)The stirrups shall bear the shearing task, and the stirrup shall be in accordance with the shearing requirements.The specification specifies that the walls of the shear walls are provided with edge elements and that the volume of the stirrups is required to protect the shearThe ductility of the force wall, that is to say, by strengthening the end of the concrete with stirrups, improves the deformability of the walls and avoids the deformation of the wallsAvoid (or delay) the wall member under the joint action of the axial pressure and the bending moment, crushing the concrete in the compression zone. Everybody look!It is not difficult to see that the structure characteristic and the length of Lc are similar to the structure of Reinforced Concrete Deep BeamsO.The stirrup can be considered with composite stirrups with tension bars, which are similar in form to compound stirrups in the frame columnsThe composite stirrups in the dark columns are not designed for shear resistance, although they have a certain resistance to shearLike shear walls, the vertical distribution bars have the same shear resistance, and they do not take into account the beneficial effects in the calculation. WhenHowever, for small wall or small dark columns (corner wall), would involve the stirrups as shear reinforcement.Circumstances are beyond the scope of this discussion.Specifications, specifications and related background information (e.g., building seismic design code)"Understanding and application" and the treatment and calculation of some difficult problems in the design of multi story reinforced concrete structuresExamples, "building seismic design manual" and so on, pointed out that the ratio of the length of stirrups should be no more than 3, two stirrups sleeveThe 1/3 of each other is not less than its long side length, so as to ensure the restraint ability of the stirrups. General composite hoopThe tendons in the tendons should be placed as little as possible and shall not exceed 1/3 of the stirrups, and the length of the stirrups shall not exceed 300The vertical longitudinal bars are pulled at least one by one along the horizontal direction.Calculation of stirrup volume and stirrup ratio, calculation of concrete core area of inner surface of stirrups, such as composite hoopThe structure of the bar should be the same as that of the frame column. For example, the tension bar should be made into a 135 degree curved hook (not in the diagram)Straight hook).Like Jianrong brothersHere's how it works. No matter how long the dark columns are, one layer adds only one big hoopThe reinforcing bars form dark columns and stirrups, and the binding capacity of the stirrups is very poor, and the combination of the small stirrups and the horizontal reinforcement of the wall is also not the sameEnsure effective restraint on end concrete. In China Academy of Building Research prepared "housing construction earthquake.""Design FAQ" ("project earthquake") published in 2002 related content, this forum has been postedIt is pointed out that the horizontal distribution bars with reliable anchorage can also be included in the stirrup volume stirrupAt this time, the horizontal distribution bars shall be bent out of the dark columns, which are bent into the inner side of the longitudinal columns and the first longitudinal bars at the ends of the columnsThe inside bending 10d, and the horizontal reinforcement in the dark column horizontal anchorage length should comply with the standard requirements (LaE), soThe structure is reflected in some construction manuals and can be consulted. Now, many times in engineering, or in addition toThe horizontal reinforcement is anchored in the concealed column without design requirement, and the horizontal reinforcement is extended out of the longitudinal reinforcement of the concealed columnTo the end of the first longitudinal longitudinal reinforcement, the curved 10d is anchored in the concealed column, so that it cannot be included in the stirrupsVolume stirrup ratio.Some problems in the design of short leg shear wall structure, such as the formation of the structural system, the concept of layout, the principle of calculation, the main points of analysis and the construction requirements, are discussed and some suggestions for designers are put forwardKey words: short leg shear wall structure, high-rise residential structure system design experience, layout principle, design staff calculation and analysis, wall height structureStructural requirements of short limbed shear wall structure system1) because the general small high-rise shear wall structure, the total height of the house in 4O 50m, so for the L4 layer below the small high-level, the bottom reinforcement zone height is generally at the bottom of the 3 layer. The concept of restrained edge member appears in the new seismic code. The seismic grade of short limb shear wall in these projects is defined as grade two, and the restrained edge member must be installed.The author believes that the wall length of short leg shear wall is relatively short, the boundary elements along the wall in two directions Z close to the whole wall (see Figure 2), in order to enhance the performance of seismic wall, the whole wall can be considered as the boundary elements, of which the column longitudinal reinforcement should be dark both ends of the wall A. The reinforcing bars should meet the minimum stirrup ratio requirements of the stirrup ratio P; the restrained edge member stirrups A with the lower columns.2) according to the "high regulation" provisions of article 7.2.18 of the shear wall under vertical and horizontal reinforcement ratio: two or three seismic design should not be less than 0.25%; four level seismic design and non seismic design should not be less than 0.2%".For the above general engineering short wall horizontal reinforcement calculation on duty at about 0.9CM, the maximum value is only 2.3era, the short leg shear wall configuration column stirrup rate P value is generally about 1.2%, can meet the provisions of this article.Reference 1 Zhao Xi'an. The design of reinforced concrete high-rise building structure. Beijing: China Architectural Industry Press, 19922. Ehua multi-storey and high-rise building structure design. Beijing: Seismological Press, Tongji University, 19923. The reinforced concrete structure (in Chinese).Beijing: China Architecture and Building Press, l980 industrial building, Vol. thirty-fifth, first, 2005