分析其原因，首先是钢筋锚固长度不够，未能伸入到支座核心区而位于保护层内，其锚固是不可靠的；
One is anchored length is short, so the bars cannot dip in the center area of support. This cause unreliable anchoring.
此外，极限粘结强度也随着锚固长度、钢筋直径的增大而减小。
In addition, the ultimate bond strength decreases with the increase of anchorage length and bar diameter.
提出普通热轧变形钢筋与活性粉末混凝土的极限粘结强度与锚固长度的计算公式。
The formula is put forward for calculating the ultimate bond stress and the anchorage length of hot-rolled deformed bars and reactive powder concrete.
所需的锚固长度的计算应考虑到钢的类型和钢筋粘结性能。
P the calculation of the required anchorage length shall take into consideration the type of steel and bond properties of the bars.
研究表明：活性粉末混凝土与钢筋的极限粘结应力随着钢筋直径的增加而下降，钢筋直径相同时随着锚固长度的增加而降低。
Results indicate that the ultimate bond stress between bars and RPC decreases with the increase of bar diameter or with anchorage length when bar diameter is the same.
介绍注浆和锚固钢筋的设计，包括注浆半径、注浆孔的布置、注浆材料的配和比，以及钢筋和注浆孔的长度及相互间的位置关系。
The design methods of it are presented, including grouting holes radius and location, material ratio and length of reinforcement bars and holes, inter-relations of them are included too.
粘结锚固长度相同时，无论是横肋对称还是横肋非对称钢筋粘结强度随混凝土强度的提高而提高。
The bond-anchoring strength of rebar (whether transverse ribs distributed symmetrically or not) increased with increase in concrete strength when they had the same of anchorage length.
根据拔出试件的试验结果，研究了保护层厚度、锚固长度、钢筋直径及钢筋表面形状这些参数对粘结锚固性能的影响。
Based on the results of the pullout tests, the influences of the thickness of UHTCC cover, anchorage length, bar diameter and the shape of bars surface on anchorage behavior is studied.
根据拔出试件的试验结果，研究了保护层厚度、锚固长度、钢筋直径及钢筋表面形状这些参数对粘结锚固性能的影响。
Based on the results of the pullout tests, the influences of the thickness of UHTCC cover, anchorage length, bar diameter and the shape of bars surface on anchorage behavior is studied.
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