Question

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As with several previous codes, ACI 318-95 furnishes design guidelines for shear reinforcement based on the vertical shear force Vu that develops at any given cross section of a member. Although it is really the diagonal tension for which shear reinforcing must be provided, diagonal tensile forces (or stresses) are not calculated. Historically, vertical shear force (and in older codes, vertical shear stress) has been taken to be a good indicator of the diagonal tension present.
The design of bending members for shear is based on the assumption that the concrete resists part of the shear, and any excess over and above what the concrete is capable of resisting has to be resisted by shear reinforcement. The basic rationale for the design of the shear reinforcement, or web reinforcement as it is usually called in beams, is to provide steel to cross the diagonal tension cracks and subsequently keep them from opening. Visualizing this basic rationale with reference to Figure 4-3, it is seen that the web reinforcement may take several forms, such as (1) vertical stirrups, (2) inclined or diagonal stirrups, and (3) the main reinforcemet bent at ends to act as inclined stirrups.

Answer 1

如几次码 aci 318-95 furnishes设计准则剪加固基于垂直剪力vu开发随时 cross section of a member. 虽然这是真的斜拉其中剪加固必须提供, 对角线拉力(或压力)也计算在内. 在历史上,纵向剪力(旧码 垂直剪应力)已采取的是一个很好的指标的对角线张力. 设计员弯曲剪是基于这样的假设混凝土抵制部分的剪切, 任何超过以上何种具体的能力,抵制要抵制剪增援. 基本理念的设计抗剪钢筋 或箍筋,因为这是一般所谓的横梁, 是提供钢铁穿过斜拉裂缝,然后让他们从开放. visualizing这一基本原理参照图4-3 , 可以看出,这种箍筋可采取若干形式,例如: ( 1 )垂直箍筋, ( 2 )倾斜或斜向箍筋, ( 3 )主要reinforcemet弯两端充当斜筋.

Answer 2

用几个先前的代码,ACI 318-95 将会根据垂直剪切力来设计一种抗剪钢筋,用来提高某部分的横截面.虽然在这些部位剪切应力将会以斜拉应力的形式被提供,而斜拉应力(或压力)是不可计算的.在历史上,垂直剪切应力(或是旧的编码中,垂直剪切应力)是一个很好的事例用于表现斜拉应力.
弯曲部分的设计是以假设混凝土抵抗部分剪切应力为基础的,并且很多混凝土本身不能承受的剪切应力都是由抗剪钢筋来承担.抗剪钢筋或网状态钢筋设计的基本原理往往是根据横梁来决定,使得钢筋交叉来提供足够的斜拉应力.从图4-3中我们可以看到这一基本原理.它显示了网状的抗剪钢筋的不同形式,例如1.竖向箍筋,2.斜向的马镫型3在主要地点加固而形成斜向的马镫型