Control of Cracking Due to Volume Change in Base-Restrained Concrete Members
Control of Cracking Due to Volume Change in Base-Restrained Concrete Members
复制标题
控制基础约束混凝土构件体积变化引起的开裂
DOI：
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发表时间：
1990
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：
R. S. A. RawiI;G. F. Kheder
本文研究了具有连续基底约束的薄砂浆墙体的收缩开裂行为。通过自然干燥条件下的缩小比例墙体模型，确定水平和垂直（销钉）加固的影响，以及墙体长高和长高比对裂缝宽度和间距的影响。基础约束对裂缝宽度和裂缝间距有显著影响。与端部约束构件相比，在相同体积变化量和钢比下，基底约束构件的裂缝间距较小。裂缝间距主要与水平配筋和墙体高度的综合作用有关。另一方面，裂缝宽度沿墙高的变化被观察到。这种变化被证明与墙体的约束变化量有关。最后，采用约束变化原理，提出了沿墙高任意位置最大裂缝宽度的预测公式。
This work investigated shrinkage cracking behavior of thin mortar walls with continuous base restraint. Reduced-scale wall models were subjected to natural drying conditions to determine the effects of the horizontal and vertical (dowel) reinformcement, as well as the effects of wall length and height and length-height ratio on crack width and spacing. The base restraint showed a significant effect on the crack width and spacing. Smaller crack spacing in base restrained members were obtained for the same amounts of volume change and steel ratio, and compared with end-restrained members. Crack spacing proved to be related mainly to the combined effects of the horizontal reinforcement and wall height. On the other hand, a variation in crack width along the wall heights was observed. this variation proved to be related to the amount of change in restraint in the wall associated with its cracking. Finally, adopting the change-of-restraint principle, a formula has been suggested for the prediction of maximum crack width at any position along the wall height.