Shear Stress around Vertical Wall Abutments
Shear Stress around Vertical Wall Abutments
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DOI：
10.1061/(asce)0733-9429(1998)124:8(822
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发表时间：
1998-08
影响因子：
2.4
通讯作者：
A. Molinas;Khaled A. Kheireldin;Baosheng Wu
中科院分区：
文献类型：
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作者：
A. Molinas;Khaled A. Kheireldin;Baosheng Wu
通过试验研究了直墙桥台周围的剪应力分布规律，确定了直墙桥台上游转角处的最大剪应力。剪切应力分布弗劳德数范围从0.30到0.90和突起比（突起长度的比例垂直于流动方向的总通道宽度）为0.1，0.2，和0.3。桥台鼻端区域的剪应力可表示为收缩和桥台结构单独产生的应力之和。导出了头部剪切放大系数Λnose的表达式，Λnose定义为头部区域底部剪切应力与来流剪切应力的比值。这种放大是由于收缩和突起的存在。在计算直墙桥台产生的总剪应力时，给出了短收缩段剪应力放大系数Λ n和桥台结构单独产生的剪应力放大系数Λ nos的表达式。
Shear stress distribution around vertical wall abutments is studied experimentally, and maximum shear stresses that occur at the upstream corner of vertical wall abutments are determined. Shear stress distributions are presented for Froude numbers ranging from 0.30 to 0.90 and for protrusion ratios (ratio of protrusion length perpendicular to direction of flow to total channel width) of 0.1, 0.2, and 0.3. Shear stress at the nose region of an abutment can be expressed as the sum of stresses due to contraction and the abutment structure alone. An expression for the nose shear amplification factor, Λnose, defined as the ratio of the bottom shear stress at the nose region to the approach flow shear stress, is derived. This amplification is due to the contraction and to the presence of a protrusion. In the computation of total shear stresses due to vertical wall abutments, expressions for the shear stress amplification at short contracted reaches, Λcont, and amplification due to abutment structure alone, Λnos...