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Anonymous users2024-02-06The longitudinal reinforcement is what we usually call the stressed reinforcement, and the upper part of the support is generally tensile at the upper part of the support, and the lower part of the span is tensile at the middle and lower part; The stirrups are subjected to shear force, that is, the shear resistance of the oblique section; The name of the waist bar is derived from its location in the belly of the beam, which is mainly used for torsional resistance, of course, many cases are structured, in order to avoid the lack of reinforcement in a large area, and it is necessary to maintain a minimum reinforcement ratio; As the name suggests, the erection reinforcement is not forced, just the erection effect, for example, the stressed reinforcement at the top of your beam has 4 at the support position, the specification requires that the two must be penetrated, and the remaining two can be truncated in the appropriate position, so that there are only two reinforcements in the upper part of the span, if the stirrups are limb hoops, then the two limbs in the middle of the stirrups can not be supported, at this time it is necessary to increase the erection reinforcement of two structures, its diameter is smaller than the diameter of the stressed reinforcement at the bearing, erection reinforcement and truncation of the two lap joints, At this time, the stirrups have a bearing point, and the erection of steel bars plays this role!
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Anonymous users2024-02-05The function of stirrups is mainly used to meet the shear strength of the oblique section, and connect the stressed main reinforcement and the concrete in the compression zone to make it work together, in addition, it is used to fix the position of the main reinforcement and make various reinforcements in the component (beam or column) constitute the reinforcement of the reinforcement skeleton. Common stirrups include single-limb stirrups (also called hooks), open rectangular stirrups, closed rectangular stirrups, diamond-shaped stirrups, special-shaped stirrups, circular stirrups and spiral stirrups (often used in piles).
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Anonymous users2024-02-04The main role of stirrups in reinforced concrete members is to withstand shear forces.
Stirrups are used to meet the shear strength of oblique cross-section, and connect the tension main reinforcement and the concrete in the compression zone to make them work together, in addition, the reinforcement that is used to fix the position of the main reinforcement and make various reinforcements in the beam constitute the reinforcement skeleton. It is the annular (of course there are circular and rectangular) reinforcement of the beam and column shear resistance configuration, which is the mouth of the zigzag, which holds the upper and lower reinforcement in place while resisting the shear force.
Advantages of prestressed concrete beams compared with reinforced concrete beams:
1.Because the concrete tensile zone of the beam is preloaded, the tensile stress generated after the load is partially offset, which makes up for part of the weakness of the poor tensile strength of the concrete, so it has better crack resistance than the ordinary reinforced concrete beam;
2.The concrete tension zone of the beam is preloaded, and the beam produces reverse arch deformation, and the deflection generated after the load is partially offset, so it is smaller than the deflection of the ordinary reinforced concrete beam;
3.Due to the small deflection, the span of the beam can be made larger under the same load, cross-section and material;
4.Steel bars with small diameter and high strength can be used, which saves steel.
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Anonymous users2024-02-03The correct answer is: option C.
Answer analysis: stirrups are mainly responsible for shear force, and the position of the stressed steel bar can also be fixed in the structure, so as to be tied into a steel skeleton.
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Anonymous users2024-02-02Describe the role of longitudinal stress reinforcement, erection reinforcement and stirrup of the beam respectively?
Hello dear! We'll be happy to answer for you. Describe the role of longitudinal stress reinforcement, erection reinforcement and stirrup of the beam respectively?
Answer: Hello, the longitudinal stressed steel bar is set along the length of the component and is located on the four sides of the component is the positive section bearing capacity of the component Stirrups are placed on the four sides of the positive section of the component is relative to the oblique section bearing capacity of the member The bent reinforcement is located at the junction of the main and secondary beams It is used to carry the shear force transmitted to the main beam by the secondary beam The position of the erection reinforcement is similar to the position of the longitudinal stressed steel bar Just less than the longitudinal reinforcement Plays a structural role The longitudinal structural reinforcement used to erect stirrups is set along the length of the component and is located in the middle of the member When the component size is large but the reinforcement is small, the reinforcement needs to be set up and constructed longitudinally, thank you for your patience. The above is my full reply, if you are satisfied with my service, please give a thumbs up, and I wish you all the best!
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Anonymous users2024-02-01Answer]: A The test point of this question is the main role of longitudinal stressed steel bars in reinforced concrete beams. The longitudinal stressed steel bars are arranged in the tension area of the beam to bear the tensile force due to the bending moment.
The reinforcement should be based HRB400, HRB500, HRBF400 and HRBF500 reinforcement.
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Anonymous users2024-01-31In the reinforced concrete beam, it is generally equipped with longitudinal stressed steel bar, stirrups, bent steel bar, and erection steel bar.
Longitudinal stressed reinforcement: used to follow the tensile force generated by the bending moment in the beam, stirrup effect: used to bend the steel bar with the main tensile stress caused by the shear force and bending moment in the beam
In addition to the tensile force generated with the positive bending moment in the span tartar burn blindness, the main tensile stress generated by the bending moment and shear force is used in the yard bending section close to the support.
Erection reinforcement appointment: in order to fix the correct position of stirrups and form a reinforcement skeleton on both sides of the outer edge of the compression zone of the beam, parallel to the longitudinal stress reinforcement, the erection section is arranged to erect the reinforcement, in addition, the erection reinforcement can also withstand the stress caused by temperature change and concrete shrinkage, to prevent cracks.
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Anonymous users2024-01-30Answer: C
2021 new textbook p21 page.
The main test of this question is: the main role of stirrups, stirrups are mainly responsible for the rapid shear force, and the position of the stressed steel bar can also be fixed in the structure, so as to bind into a steel skeleton.
Answer] The failure mode of the normal section of the beam is related to the reinforcement ratio, concrete strength grade, cross-section form, etc., and the reinforcement ratio has the greatest impact. With the difference of longitudinal tensile reinforcement ratio, the positive section of reinforced concrete beam may appear the failure of three different properties such as suitable reinforcement, over-reinforcement, less reinforcement. The failure of suitable reinforcement is plastic failure, and the reinforcement and concrete of suitable reinforcement beam can be fully utilized, which is both safe and economical, and is the basis for the ultimate state calculation of the bearing capacity of the positive section of the flexural member. >>>More
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Set up the erection bars.
There are two ways, one is to enter the middle span reinforcement (2b16) in the in-situ annotation, and the erection reinforcement information needs to be enclosed in parentheses, and the other is to enter 2b16+(2b16) in the upper reinforcement of the centralized annotation, which also needs to be bracketed. >>>More