A New Look at the Control of Volume Change Cracking of Base Restrained Concrete Walls
A New Look at the Control of Volume Change Cracking of Base Restrained Concrete Walls
复制标题
基层约束混凝土墙体积变化裂缝控制的新认识
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
G. F. Kheder
中科院分区：
文献类型：
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作者：
G. F. Kheder
体积变化裂缝是基层约束混凝土墙体普遍存在的问题。在这种墙中，约束的程度是不均匀的，而是取决于墙的长度/高度比和墙本身内所考虑的点的位置。对具有不同长高比的墙体进行了二维有限元分析，以确定这些墙体内约束的变化。裂缝宽度与开裂前后墙体约束力的变化有直接关系。根据得到的约束因子，绘制了约束变化的理想图。这些图表用于确定控制墙体体积变化开裂所需的钢筋的确切数量。在能够有效控制这些裂缝的位置提供钢筋。因此，在墙壁中使用了可变的钢量。这就产生了有效强化的概念。根据37个足尺墙体和8个试验墙体的开裂数据，对这一概念和提出的墙体开裂控制方法进行了试验。比较表明，良好的协议之间的理论和观察到的裂纹宽度。
Volume change cracking is a widespread problem in base restrained concrete walls. In such walls the degree of restraint is not uniform, but depends on the wall length/height ratio and on the position of the point in consideration within the wall itself. A two dimensional finite element analysis was carried out on walls with different L/H ratios to determine the variation of restraint within these walls. Also crack width was proved to be directly related to the change of restraint in the wall before and after cracking. From the restraint factors obtained, idealized diagrams of the change of restraint were prepared. These diagrams were used to determine the exact amount of steel reinforcement that is required for the control of volume change cracking in the walls. Steel reinforcement was provided in positions where it is really effective in controlling these cracks. Therefore, variable steel quantities were used in the walls. This led to the effective reinforcement concept. This concept and the proposed method for the control of cracking in walls were tested against the cracking data obtained from 37 full size walls and 8 experimental walls. The comparison showed good agreement between the theoretical and observed width of cracks.