反复荷载下半灌浆套筒连接件模拟及优化

Simulation and Optimization of Semi-grouted Sleeve Connectors under Repeated Loads

为了选取适用于反复荷载作用下钢筋与灌浆料之间黏结滑移的实现方式,同时为了解决半灌浆套筒连接件在反复荷载作用下伸长位移较大及钢筋拔出的问题,提出了在灌浆锚固端增加锚固板的优化方式。采用ABAQUS软件,设置不同钢筋直径,采取单调拉伸及反复拉压两种加载制度进行加载,进行有限元模拟分析。结果表明,反复荷载制度下连接件的极限荷载降低了约5.5%;反复荷载使得连接件在线弹性阶段产生的位移增加了130%左右,且随钢筋直径增大而增大;增加锚固板的优化方案避免了钢筋拔出破坏,使得连接件极限荷载得以提升;增加锚固板使得反复荷载下每轮循环产生的位移较为均匀,且有效减少了位移总量;反复拉压较单调拉伸情况下,灌浆料损伤增加26%,优化后的连接件的灌浆料损伤略有降低。

In order to select the implementation mode suitable for the bonding slip between the rebar and the grout material under repeated loading,and at the same time,in order to increase the anchoring plate in the grouting anchoring area of the semi-grouted sleeve connector under repeated loads,the optimization method of increasing the anchoring plate in the grouting anchoring area is proposed.By analyzing several bonding slip implementation methods,ABAQUS software is used to set up finite element simulation specimen groups with different rebar diameters and optimize before and after,and two loading systems of monotonic stretching and repeated tensioning are adopted for loading.The results show that the ultimate load of the connector is reduced by about 5.5% under the repeated load system.The repeated load increases the displacement generated by the online elastic stage of the connector by about 130%,and increases with the increase of the diameter of the rebar.The optimization scheme of increasing the anchor plate avoids the damage of the steel bar pull-out,so that the limit load of the connector can be increased.The increase of anchoring plate makes the displacement generated by each round of circulation under repeated loads more uniform,and effectively reduces the total displacement.In the case of repeated tension and monotonous stretching,the damage of the grout is increased by 26%,and the damage of the grout of the optimized connection is slightly reduced.