There are many kinds of reinforcing bars, which are usually classified according to chemical composition, production process, rolling shape, supply form, diameter and size, as well as the use in the structure. Here we mainly sort out the classification according to the use.

　　1.受力筋

　　1. force bar

　　指布置在梁或板的下部.承受拉力的那部分钢筋及抗剪切的起弯筋.吊筋等。怎么样区分板的受力筋跟分布筋？

　　Refers to the lower part of a beam or slab, the part of steel bars that bear tension and the shear-resistant bending bars, suspension bars, etc. How to distinguish the stress ribs from the distribution ribs?

　　（1）以板的开间、进深跨度区分：如果是单项板，那么平行于短跨方向的钢筋是受力筋，平行于长跨方向的钢筋是架立筋。如果是双向板，那么长跨、短跨方向的钢筋全部是受力筋。

　　(1) Distinguishing by the spans of the slabs: If it is a single slab, the steel bar parallel to the short span direction is the force bar, and the steel bar parallel to the long span direction is the erection bar. If it is a two-way slab, then the long-span and short-span direction of the reinforcement are all force bars.

　　（2）以钢筋直径上来区分：钢筋的直径大的为受力筋，直径小的钢筋为分布筋；

　　(2) Distinguishing by the diameter of reinforcing bars: the larger the diameter of reinforcing bars, the smaller the diameter of reinforcing bars, the distribution of reinforcing bars;

　　（3）以布置上来区分：正弯矩筋布置在下的钢筋为受力筋，在之上垂直分布的钢筋为分布筋，负弯矩筋（如悬挑板 ）相反，在下的钢筋为分布筋，在之上的钢筋为受力筋。

　　(3) Distinguish by layout: the steel bar with positive moment bar is the stress bar, the steel bar with vertical distribution is the distribution bar, the negative moment bar (such as cantilever plate) is the opposite, the steel bar with lower moment bar is the distribution bar, and the steel bar with upper moment bar is the stress bar.

　　2.分布筋

　　2. distributing tendons

　　出现在板中，布置在受力钢筋的上部，与受力钢筋垂直。作用是固定受力钢筋的位置并将板上的荷载分散到受力钢筋上，同时也能防止因混凝土的收缩和温度变化等原因，在垂直于受力钢筋方向产生的裂缝.属于构造钢筋。（满足构造要求，对不易计算和没有考虑进去的各种因素，所设置的钢筋为构造钢筋。）

　　Appears in the board, is arranged in the upper part of the stressed steel bar, and is perpendicular to the stressed steel bar. The function is to fix the position of the stressed steel bar and distribute the load on the slab to the stressed steel bar. At the same time, it can prevent the cracks in the direction perpendicular to the stressed steel bar due to the shrinkage and temperature change of the concrete. It belongs to the structural steel bar. (To satisfy the structural requirements, for various factors that are not easy to calculate and are not taken into account, the steel bars set up are structural steel bars.)

　　3.箍筋

　　3. stirrups

　　用来满足斜截面抗剪强度，并联结受拉主钢筋和受压区混凝土使其共同工作，此外，用来固定主钢筋的位置而使梁内各种钢筋构成钢筋骨架的钢筋。是梁和柱抵抗剪力配置的环形（当然有圆形的和矩形的）钢筋，是口字形的，将上部和下部的钢筋固定起来，同时抵抗剪力。

　　It is used to satisfy the shear strength of oblique section and to connect the tension main steel bar and the concrete in compression zone to work together. In addition, it is used to fix the position of the main steel bar and make the various steel bars in the beam form the steel bar skeleton. It is a circular (circular and rectangular) steel bar with shear resistance of beams and columns. It is an oral shape. It fixes the upper and lower steel bars and resists shear at the same time.

　　4.架立筋

　　4. vertical reinforcement

　　是梁上部的钢筋，只起一个结构作用，没实质意义，但在梁的两端则上部的架立筋抵抗负弯距，不能缺少。（架立钢筋设置在梁的受压区外边缘两侧，用来固定箍筋和形成钢筋骨架。如受压区配有纵向受压钢筋时，则可不再配置架立钢筋。架立钢筋的直径与梁的跨度有关。）

　　It is the steel bar on the upper part of the beam, which only plays a structural role and has no substantial significance, but at both ends of the beam, the erecting bar on the upper part resists negative bending distance, which is indispensable. (The erecting steel bar is set on both sides of the outer edge of the compression zone of the beam to fix the stirrups and form the steel bar skeleton. If the compression area is equipped with longitudinal compression steel bar, erecting steel bar can be no longer equipped. The diameter of the erecting steel bar is related to the span of the beam.

　　5.贯通筋

　　5. through tendon

　　是指贯穿于构件（如梁）整个长度的钢筋，中间既不弯起也不中断，当钢筋过长时可以搭接或焊接，但不改变直径。

　　It refers to the reinforcing bar that runs through the whole length of a member (such as a beam) without bending or interrupting. When the reinforcing bar is too long, it can be lapped or welded without changing the diameter.

　　架立筋和贯通筋有什么区别？

　　What is the difference between erecting tendons and perforating tendons?

　　在钢筋布置上，架立钢筋是布置本跨的1/3，也就是说，本跨梁存在左右支座钢筋。通长钢筋是全长布置。架立筋起架立作用，一定的受压作用，可以在一定程度上提高梁的承载力。

　　In the arrangement of reinforcing bars, erecting reinforcing bars are 1/3 of the span, that is to say, there are left and right support reinforcing bars in the span beam. The long reinforcement bar is the long layout. The erecting reinforcement acts as a erecting force and has a certain compressive effect, which can improve the bearing capacity of the beam to a certain extent.

　　贯通筋是指贯穿于构件（如梁）整个长度的钢筋，中间既不弯起也不中断，当钢筋过长时可以搭接或焊接，但不改变直径。贯通筋既可以是受力钢筋，也可以是架力钢筋。架力筋也有贯通的，如规范中规定在梁上部两侧的架力筋必须是贯通的，此时的架力筋在支座处也可承担一部份负弯矩。

　　The through bar refers to the reinforcing bar that runs through the whole length of a member (such as a beam) without bending or interrupting. When the reinforcing bar is too long, it can be lapped or welded without changing the diameter. The through bar can be either a force steel bar or a frame steel bar. For example, in the code, the stiffeners on both sides of the upper part of the beam must be through. At this time, the stiffeners can also bear some negative bending moments at the support.

　　如果在梁的上下都有通长的钢筋，一般在梁上（受压区）且直径较小的是架力筋，在梁下的是都受力钢筋。

　　If there are long reinforcing bars above and below the beam, generally in the beam (compression zone) and the diameter of the smaller is the frame reinforcement, under the beam are all stressed steel bars.

　　6.负筋

　　6. negative reinforcement

　　就是负弯矩钢筋，弯矩的定义是下部受拉为正，而梁板位置的上层钢筋在支座位置根据受力一般为上部受拉，也就是承受负弯矩，所以叫负弯矩钢筋。（支座有负筋,是相对而言的,一般应该是指梁的支座部位用以抵消负弯矩的钢筋，俗称担担筋。一般结构构件受力弯矩分正弯矩和负弯矩,抵抗负弯矩所配备的钢筋称为负筋,一般指板、梁的上部钢筋，有些上部配置的构造钢筋习惯上也称为负筋。当梁、板的上部钢筋通长时，大家也习惯地称之为上部钢筋，梁或板的面筋就是负筋）。

　　The definition of bending moment is that the lower part of the steel bar is tensioned positive, while the upper part of the beam and slab position is generally tensioned on the upper part of the support seat according to the force, that is, to bear negative bending moment, so it is called negative bending moment steel bar. (Bearing with negative reinforcement, is relatively speaking, should generally refer to the support part of the beam to offset negative bending moment of the reinforcement, commonly known as load-bearing reinforcement. The bending moment of general structural members can be divided into positive moment and negative moment. The steel bars equipped to resist negative moment are called negative bars. The upper bars of finger plates and beams are generally referred to as negative bars. When the upper reinforcing bars of beams and slabs are long, they are also customarily referred to as the upper reinforcing bars, and the gluten of beams or slabs is the negative reinforcing bars.

　　7.拉结筋

　　7. tie bars

　　在无法同时施工的两个或多个构件之间预留的起拉结作用的钢筋就是拉结筋 。是加强框架填充墙与柱连结的受力钢筋，提高了填充墙稳定性和抗震能力。

　　Tensile reinforcement is reserved between two or more components that cannot be constructed at the same time. It is a reinforced bar that strengthens the connection between frame filled wall and column, and improves the stability and seismic capacity of filled wall.

　　8.腹筋

　　8. web reinforcement

　　一般位于梁两侧中间部位而得来的，是梁中部构造钢筋,主要是因为有的梁太高，需要在箍筋中部加条连接筋 （梁侧的纵向构造钢筋实际中又称为腰筋）。在梁高450mm，就应沿梁高两侧应设腰筋，所以数量上就不会少于2根。腰筋的直径小的直径为10mm，间距不应大于200mm，同时面积配筋率不应小于百分之0.3，在梁两侧的纵向构造钢筋（腰筋）之间还要配置拉结钢筋。 一般民用建筑的腰筋直径用16和18就可以了，拉筋用圆8。

　　Generally located in the middle part of both sides of the beam, the structural steel bar in the middle of the beam is obtained, mainly because some beams are too high and need to add a connecting bar in the middle of the stirrup (the longitudinal structural steel bar in the side of the beam is also known as the waist bar in practice). In the 450mm beam height, waist reinforcement should be installed along both sides of the beam height, so the number will not be less than two. The minimum diameter of waist reinforcement should be 10 mm, the spacing should not be greater than 200 mm, and the reinforcement ratio of area should not be less than 0.3%. Tensile reinforcement bar should also be arranged between longitudinal structural reinforcement bar (waist reinforcement) on both sides of the beam. The diameter of waist tendons in general civil buildings should be 16 and 18, and the diameter of tension tendons should be 8.