The steel bar equipped to resist the negative bending moment is called negative steel bar
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The tie bars should be set between the longitudinal structural bars (waist bars) on both sides of the beam
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(the erection reinforcement is set on both sides of the outer edge of the compression area of the beam to fix the stirrup and form the reinforcement framework
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(to meet the structural requirements, for various factors that are not easy to calculate and are not taken into account, the steel bars set are structural steel bars.) 3 stirrups are used to meet the shear strength of inclined section, parallel connection of tensile main reinforcement and concrete in compression area to make them work together
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It is recommended to watch in the environment
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What’s the difference between erecting bar and through bar? In terms of reinforcement arrangement, the erection reinforcement is 1 / 3 of the span
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Generally speaking, the bending moment of structural members can be divided into positive bending moment and negative bending moment
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In addition, stirrups are used to fix the position of main reinforcement and make all kinds of reinforcement in the beam form reinforcement framework
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The function is to fix the position of the load-bearing steel bar and disperse the load on the plate to the load-bearing steel bar
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The through reinforcement can be load-bearing reinforcement or support reinforcement
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2
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The steel bar for reinforced concrete refers to the straight or coiled steel bar for reinforced concrete reinforcement
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The distributed reinforcement appears in the slab, which is arranged on the upper part of the stressed reinforcement and perpendicular to the stressed reinforcement
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The definition of bending moment is that the lower part of the reinforcement is in positive tension, while the upper part of the reinforcement at the beam slab position is in upper tension according to the force, that is, bearing negative bending moment, so it is called negative bending moment reinforcement
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When the reinforcement is too long, it can be overlapped or welded, but the diameter does not change
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Of course, these can be found at random, so we mainly sort out the classification according to the use: 1
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It is a circular (of course, circular and rectangular) steel bar for beams and columns to resist shear force
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The supporting bars are also connected
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However, at both ends of the beam, the upper vertical bars can resist the negative bending moment and cannot be lacked
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If the compression zone is equipped with longitudinal compression reinforcement, the erection reinforcement can no longer be provided
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6 negative reinforcement is negative bending moment reinforcement
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8 web reinforcement is generally located in the middle of both sides of the beam, which is the structural reinforcement in the middle of the beam
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If there is a full-length steel bar above and below the beam, generally on the beam (compression area) and the smaller diameter is the load-bearing steel bar, under the beam is the load-bearing steel bar
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How to distinguish the stressed reinforcement from the distributed reinforcement? (1) According to the slab Bay and depth span: if it is a single slab, the reinforcement parallel to the short span direction is the load-bearing reinforcement, and the reinforcement parallel to the long span direction is the erection reinforcement
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The erection reinforcement plays a role of erection and certain compression, which can improve the bearing capacity of the beam to a certain extent
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If it is a two-way slab, then the reinforcement in the direction of long span and short span are all stressed reinforcement
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Four vertical bars are the steel bars in the upper part of the beam, which only play a role in the structure and have no real significance
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The diameter of erecting reinforcement is related to the span of beam.) 5 through reinforcement refers to the reinforcement that runs through the whole length of the component (such as beam) without bending or interruption in the middle
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At the same time, it can also prevent the cracks perpendicular to the direction of the load-bearing steel bar due to the shrinkage of concrete and temperature change
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It is mouth shaped, which can fix the upper and lower steel bars and resist shear force at the same time
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The minimum diameter of the waist bar is 10 mm, the spacing should not be greater than 200 mm, and the area reinforcement ratio should not be less than 0.3%
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Its shape is divided into plain round steel bar and deformed steel bar, and the delivery status is straight bar and coiled steel bar
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The full-length reinforcement is arranged in the whole length
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It is mainly because some beams are too high, so it is necessary to add a connecting bar in the middle of the stirrup (the longitudinal structural reinforcement on the beam side is also called waist reinforcement in practice)
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7 tie bars are reserved between two or more members that cannot be constructed at the same time to play the role of tie bars
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(bearing with negative reinforcement is relatively speaking, it generally refers to the reinforcement used to offset the negative bending moment at the bearing part of the beam, commonly known as the bearing reinforcement
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Is to strengthen the frame infill wall and column connection of stress reinforcement, improve the infill wall stability and seismic capacity
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Generally, the waist bar diameter of civil buildings is 16 and 18, and the tie bar diameter is 8
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Steel bar: steel bar for reinforced concrete and pre stressed reinforced concrete, its cross section is round, sometimes it is a square with rounded corners
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Generally, it refers to the upper steel bar of slab and beam
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The load-bearing steel bar refers to the part of steel bars arranged in the lower part of the beam or plate, bearing the tensile force and the shear strength Cut bending bar, hanging bar, etc
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There are many kinds of steel bars, usually according to the chemical composition, production process, rolling shape, supply form, diameter, and the use in the structure
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When the upper reinforcement of a beam or slab is long, it is also called the upper reinforcement, and the surface reinforcement of the beam or slab is the negative reinforcement
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In other words, there are left and right support reinforcement in the beam of this span
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If the beam height is 450mm, waist reinforcement should be set along both sides of the beam height, so the number will not be less than 2
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When the reinforcement is too long, it can be overlapped or welded without changing the diameter
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Some structural steel bars equipped on the upper part are also called negative steel bar
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(2) According to the diameter of the reinforcement, the larger the diameter of the reinforcement is the load-bearing reinforcement, and the smaller the diameter is the distribution reinforcement; (3) according to the arrangement, the reinforcement with positive bending moment is the load-bearing reinforcement, the reinforcement with vertical distribution above is the distribution reinforcement, and the reinforcement with negative bending moment (such as cantilever slab) is the distribution reinforcement, while the reinforcement above is the load-bearing reinforcement
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Through reinforcement refers to the reinforcement that runs through the whole length of a member (such as a beam), which is neither bent nor interrupted in the middle
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If it is stipulated in the specification that the supporting bars on both sides of the upper part of the beam must be connected, the supporting bars can also bear part of the negative bending moment at the support
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