首页 底层框架抗震墙砖房抗震设计的基本要求(Basic requirements for seismic design of brick masonry buildings with bottom frame)

底层框架抗震墙砖房抗震设计的基本要求(Basic requirements for seismic design of brick masonry buildings with bottom frame)

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底层框架抗震墙砖房抗震设计的基本要求(Basic requirements for seismic design of brick masonry buildings with bottom frame)底层框架抗震墙砖房抗震设计的基本要求(Basic requirements for seismic design of brick masonry buildings with bottom frame) 底层框架抗震墙砖房抗震设计的基本要求(Basic requirements for seismic design of brick masonry buildings with bottom frame) The basic requirements of masonry buildings with fr...

底层框架抗震墙砖房抗震设计的基本要求(Basic requirements for seismic design of brick masonry buildings with bottom frame)
底层框架抗震墙砖房抗震设计的基本要求(Basic requirements for seismic design of brick masonry buildings with bottom frame) 底层框架抗震墙砖房抗震设计的基本要求(Basic requirements for seismic design of brick masonry buildings with bottom frame) The basic requirements of masonry buildings with frame shear wall structure seismic design The characteristics of earthquake damage of masonry buildings with frame shear wall structure. Without the bottom of brick masonry building with frame shear wall seismic fortification, the bottom of the vertical wall are fewer in number and layout asymmetry, while the upper part is the distance between the vertical and horizontal wall brick is dense, the upper brick of the lateral stiffness is much lower, under the strong earthquake, the bearing capacity of resisting lateral force and stiffness of the bottom the limit relative to the second layer structure at the bottom of the first weak, will yield, into a plastic state will produce the phenomenon of concentrated deformation wells. The bottom of the first failure could endanger the safety of housing. That strong earthquake in China in recent years, the earthquake damage of this kind of building is more common, without damage to this kind of building seismic fortification is: The 1. earthquake occurred in the bottom, is "under the light weight"; The damage law of 2. is the bottom of the bottom wall than the frame column, frame column and beam weight ratio; 3. the upper part of the housing damage condition of several layers and multilayer brick is similar, but the extent of the damage of the bottom is much lighter than the house. The basic requirements of masonry buildings with frame shear wall structure seismic design Part of the bottom frame shear wall and upper brick masonry buildings with frame shear wall structure has better seismic capacity, but the seismic performance between the two different parts of load-bearing and anti - lateral force system is different, and the transition floor stress is comparatively complex. In order to make the seismic design of this type of housing to meet the "minor earthquake", the seismic fortification intensity of seismic fortification goal and can repair the big earthquake does not fall, should meet the following basic requirements. A housing, flat and vertical arrangement should be regular and symmetrical All previous earthquake damage investigation shows that the complex shape or structure (wall column, etc.) the unreasonable layout, will aggravate the housing damage. For brick masonry building with frame shear wall at the first floor, the seismic performance of reinforced concrete compared to the multi-storey poor housing. Therefore, this kind of building plane and vertical layout rules should be more stringent, housing size should be simple, symmetrical structure, lateral resistant member arrangement should be symmetrical, it can reduce the torsion under horizontal earthquake. Two, the height of the building, to limit the high aspect ratio should be appropriate In the Tangshan earthquake, the masonry buildings with frame shear wall structure seismic fortification was seriously damaged. The main reason is not set to the bottom frame aseismic system. In the severe damage of bottom frame brick bottom half frame along the street a cross frame of another cross load-bearing brick wall system, the bottom is within the framework and the underlying framework and most of the gables and the staircase wall with frame beam column etc.. Based on the summary of experience of earthquake damage, "code for seismic design of buildings GBJ11 89 of this kind of buildings is the total number of give more stringent restrictions, that is not 6, 7 degrees more than six layers, 8 degree area of not more than five floors, 9 of not more than three layer, the total number of the total number of multistory masonry buildings with respect to the area was reduced, reduce a layer in the 7, 8, 9 degree area. To reduce the two layer in the District of 6 degrees. In recent years, through the model test of brick masonry building with frame shear wall at the first floor and a series of analysis and research, In-depth study of the seismic performance of this kind of building, put forward to improve the low seismic performance of reinforced concrete wall bottom, enhance the overall seismic capacity of transition layer and the seismic design methods and construction measures. The house is more regular and more uniform along the vertical direction and meet the transition layer and the whole house around seismic capacity requirements; the total number of houses and the total height may be relaxed, but should not exceed the provisions of table 2.2- 2- 1. Table 2.2-1 total height (m) and the number of limit value Note: (1) the total height of housing refers to the outdoor surface to the eaves height, semi basement from the basement floor date, full basement ground from the outside. (2) the upper part of the building height not more than 3.6m. A large distance between the upper 4.2m part of the cross wall brick room area in a layer is greater than the total area of the layer 1 / 4 for the less cross wall, brick for the upper part of the cross wall less housing should reduce the total height of 3.0m, the total number of layers should reduce a layer. The maximum ratio of the total height of the bottom frame shear wall brick and total width, table 2.2 shall comply with the requirements of 2. Table 2.2-2 building height and width ratio Ratio of stiffness to control the shift of three and second layers and the bottom side In the elastic layer of brick masonry building with frame shear wall under earthquake displacement between uniform and reduced under the strong earthquake elastic-plastic deformation, can improve the overall seismic capacity of buildings. The elastic and elastic 1 on the bottom of brick masonry building with frame shear wall plastic interlayer displacement and ultimate shear force coefficient is analyzed, the bottom frame aseismic brick second layer and lateral displacement of the reasonable range of the stiffness ratio is 1.2 ~ 1.8 is proposed on the basis of analysis and research. According to the principle of different seismic fortification earthquake fortification intensity and safe and economic, masonry buildings with frame shear wall structure of second layer and the lateral stiffness ratio at 6 degrees should not be greater than 3, in the 7 degree should not be greater than 2.5, in the 8 degree should not be greater than 2, at 9 degrees should not be greater than 1.5 and not less than 1. The maximum distance of four, the limit value of shear wall Bottom frame brick masonrybuilding with aseismic wall spacing is divided into two parts and the upper part of the bottom layer of the upper brick brick house, preparing the wall span and multi story brick requirements should be required; the bottom frame shear wall part, due to the earthquake on the upper floors to through the bottom of the floor to the bottom layer of shear wall, the horizontal deformation of floor than the general frame shear wall Housing Stratification transfer earthquake horizontal deformation to the floor. Therefore, under the same deformation conditions, the bottom frame aseismic wall spacing real bottom shear wall is smaller than the spacing of frame - shear wall. The bottom frame shear wall masonry buildings with frame shear wall structure has good deformation and energy dissipation capacity and bearing capacity, while the upper part of the brick, deformation and energy dissipation capacity is relatively poor. In order to avoid too much stronger than the seismic capacity of bottom upper brick buildings, in addition to the calculation of masonry buildings with frame shear wall structure layer determine the ultimate shear force coefficient, weak layer, general provisions still emphasize two points, one is second layer and the bottom layer of the lateral stiffness ratio should not be less than or equal to 1 two is the maximum distance of bottom seismic transverse wall the "GBJ11-89" code for seismic design of buildings has been relaxed, Specific requirements are listed in table 2.2-3. The maximum spacing table 2.2-3 shear wall Five, the bottom width of reinforced concrete shear wall ratio In practical engineering, the bottom width of reinforced concrete wall masonry buildings with frame shear wall structure of the ratio is less than 1, usually called the low parapet height to width ratio of reinforced concrete wall is less than L. The low ratio of height to width is less than 1 of the reinforced concrete wall to shear is mainly caused by the shear force in inclined crack control of its mechanical properties, the failure state is shear failure. According to the characteristics of the bottom reinforced concrete wall bottom frame aseismic brick masonry building with frame reinforced base for low parapet, the 2 were with frame vertical seam test of reinforced concrete wall and low analysis research, experimental results show that in the mortar board and reinforced concrete plate with vertical seams reinforced concrete wall seismic performance significantly better than the overall low reinforced concrete shear wall, shear wall of the vertical seam with elastic stiffness, but the rigidity is relatively stable, the maximum load, the bearing capacity is not significantly reduced, the deformation capacity and consumption ability is greatly improved, to the purpose of good seismic performance of low parapet. On the basis of experiments and analysis, suggestions with frame vertical seam reinforced concrete wall with vertical joint segmentation wall height width ratio should not be less than 1.5, but not 2.5 subgroups. Six, the underlying structure of the brick masonry building with frame shear wall According to the "code for seismic design of buildings GBJ11 89 on seismic structural system requirements, combined with the characteristics of masonry buildings with frame shear wall structure, put forward the following requirements. (a) bottom brick masonry building with frame shear wall should be set to a frame shear wall system Bottom brick masonry building with frame shear wall stress is more complex, and serious damage to the bottom will endanger the entire housing security, the additional axial force and overturning moment of frame columns which reduced factors such as deformation capacity of frame columns, the seismic structure of the underlying requirements should be higher. The bottom 1. masonry buildings with frame shear wall structure should be set for the system of double frame longitudinal and transverse direction, to avoid a framework, another direction for continuous beam system. This is mainly due to the earthquake in two directions on the level. A direction for the continuous beam system can not play the role of the framework, the direction of the seismic capacity to reduce more. At the same time, also should not be set for half frame or gable and stair axis for the construction column and circle beam brick wall in seismic constraint. This is because the stiffness of the bottom of the seismic shear force distribution according to the lateral force component, half frame system or gable brick aseismic walls construction column and circle beam constraints, the lateral force resisting brick is the stiffness of the frames is much bigger than that in the earthquake, the first brick wall cracking and deformation ability and limb bad. On the wall is much worse than the framework, will form a wall member first out of work and result in more half frame or frame damage. The bottom 2. masonry buildings with frame shear wall structure should be set to the frame shear wall system. In the bottom 6, 7 area of small shops, the shear wall for frame filled wall; when the bottom of the brick wall filled with reinforced concrete shear wall should be less when a certain amount, in the 8 and 9 degrees, shall be reinforced concrete shear wall to set up a certain number of, The bottom frame shear wall system has formed the two line of defense, is conducive to improve the seismic capacity of the bottom. The reinforced concrete wall at the bottom of the 3. should be set to the reinforced concrete wall with frame vertical seam (two). The transition floor seismic capacity should be strengthened The test results show that the overall model, transition floor masonry buildings with frame shear wall structure stress is more complex, although the seismic wall bottom to crack, but once the second layer of brick, the cracking damage state to much heavier than the bottom. Therefore, should enhance the shear and flexural capacity of transition floor. In consideration of the overall design can strengthen bottom frame and upper masonry joint stiffness of the floor, the floor can be made of a large cast plate with the thickness of the steel plate, long vertical structure and layout; should also consider the bottom frame masonry building vertical structure, at the junction of vertical reinforced through as far as possible down, strengthen the shear and bending capability of floor structure in transition. Seven, the bottom part of the brick masonry building with frame shear wall at the bottom and upper brick structure seismic capacity should be matched. Seismic capacity of the structure along the vertical distribution it helps to improve the overall seismic capacity of buildings. The bottom frame shear wall masonry building is composed of two kinds of bearing capacity and lateral system, the bottom has a left bearing capacity and better deformation capacity, the upper part of brick has better seismic capacity, but the deformation and energy dissipation capacity is relatively poor. (3) the uniformity of brick bottom frame shear wall are discussed, proposed to judge the weak floor at the bottom or in the upper part of the brick analysis method, according to the Y (1) is less than 0.8 R (2) to determine if the Y zeta < 0.8 (1) R (2). Then, the bottom for the weak floor, if the zeta y (1) >0.9 R (2), zeta second layer is the weak floor, if the zeta (1) for y (0.8--0.9) R (2), zeta is the uniform structure. The I =Vu /Ve The structure of the i layer I Zeta - limit shear coefficient Vu - layer I ultimate shear structure Ve - under the rare earthquake, according to the layer structure of floor seismic shear force I elastic theory analysis Reference (1) Gao Xiaowang, research, calculation of masonry buildings with frame shear wall structure seismic design of building science, 1995. Gao Xiaowang (2), experimental research, with frame vertical seam reinforced alkali and low wall of building science, 1985. Gao Xiaowang (3), analysis method, seismic capacity of masonry buildings with frame shear wall structure of building science, 1995. This article reviews 0 Q "The pouring underwater concrete accident treatment "The next article: rising human resources management system record "Close the window"
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