Anchorage of Large-Diameter Reinforcing Bars in Ducts
Anchorage of Large-Diameter Reinforcing Bars in Ducts
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DOI：
10.14359/56616
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发表时间：
2009-07
影响因子：
1.8
通讯作者：
Kyle P. Steuck;M. Eberhard;J. Stanton
中科院分区：
文献类型：
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作者：
Kyle P. Steuck;M. Eberhard;J. Stanton
在桥梁排架中将柱连接到盖梁的一种方法是用突出的钢筋预制柱，然后将其灌浆到盖梁中的管道中。如果用几根大的杆件和导管连接柱和盖梁，杆件-导管体系可以快速组装。然而，大型钢筋所需的锚固长度可能超过可用长度。本研究通过对尺寸最大为18号的钢筋进行14次拉拔试验来评估这种情况下的锚固要求。试验和非线性有限元模型表明，在与试验条件相似的条件下，大型棒材可以在少至6个棒材直径和少至10个棒材直径中发展其屈服强度和断裂强度。在所有的试验中，失败发生在灌浆表面附近形成一个圆锥体，并沿沿着约束的钢筋-灌浆界面剪切，或钢筋断裂。试样没有失败的管道拔出或混凝土分裂。聚丙烯纤维增强通常降低了峰值拔出强度的酒吧，并有混合后峰响应的影响。
One method of connecting a column to a cap beam in bridge bents is to precast the column with projecting bars, which are then grouted into ducts in the cap beam. Bar-duct systems can be assembled rapidly if a few large bars and ducts are used to connect the column and cap beam. However, the required anchorage lengths for the large bars can exceed the length available. This study evaluates the anchorage requirements for this situation by performing 14 pullout tests on bars with sizes up to No. 18. The tests and a nonlinear finite element model showed that, under conditions similar to those tested, large bars can develop their yield strength in as few as six bar diameters and fracture strengths in as few as 10 bar diameters. In all the tests, failure occurred either by formation of a cone near the grout surface combined with shearing along the confined bar-grout interface or by bar fracture. The specimens did not fail by duct pullout or concrete splitting. Polypropylene fiber reinforcement typically lowered the peak pullout strength of the bar and had mixed impact on the post-peak response.