SWR-PM加固层与混凝土界面黏结性能试验研究

Experimental Study on Interfacial Bond Behavior between SWR-PM Composite and Concrete

进行了钢丝绳-聚合物砂浆(SWR‑PM)加固层与混凝土的单面剪切试验,研究了混凝土强度、加固层黏结长度和加载端受压高度对试件破坏形态及剥离承载力的影响规律.结果表明:试件的破坏形态包括界面剥离破坏、混凝土拉剪破坏及混合破坏;界面剥离承载力随着黏结长度的增加而增长,直至黏结长度超过有效黏结长度后,剥离承载力才趋于稳定;试件的破坏荷载随着混凝土强度的增大而提高.建立了加固层黏结长度与界面剥离承载力的关系计算式,计算结果与试验结果吻合良好.

Simple shear tests of steel wire rope‑polymer mortar(SWR‑PM)composite‑to‑concrete joint were conducted,and the influence of concrete strength,bonding length and compression depth at loading end on the failure models and debonding capacity was investigated.Test results show that failure modes include the interfacial debonding,concrete tension‑shear failure,and a mixture of the first two failure models.With the increase of the bonding length,the debonding capacity increases first and then tends to be stable when the bond length is larger than the effective bonding length.The ultimate load of specimen tends to increase as the concrete strength increases.A model between the bonding length and the interfacial peeling capacity is proposed,the computed results matched well with the experimental ones.