CAJ | 학술논문

为了避免混凝土的脆性断裂破坏,在钢/混凝土连接区域中用高延性水泥基材料(ECC)代替了普通混凝土.采用剪力键/ECC的抗剪试验、二维锚固螺栓/ECC拔出试验和有限元模拟研究了ECC材料的延性对于连接区域破坏模式、结构性能的影响.实验结果表明:通过微观力学原理设计的ECC具有300倍于普通混凝土的拉伸延性,从而使钢/混凝土连接区中混凝土断裂破坏模式由脆性转变为延性.混凝土材料的高廷性使结构承载能力和变形性能获得改善,这也同时为有限元模拟结果所验证.通过改变混凝土材料延性而提高结构性能的理念也可在其他类似的钢/混凝土组合结构中得到应用.
위료피면혼응토적취성단렬파배,재강/혼응토련접구역중용고연성수니기재료(ECC)대체료보통혼응토.채용전력건/ECC적항전시험、이유묘고라전/ECC발출시험화유한원모의연구료ECC재료적연성대우련접구역파배모식、결구성능적영향.실험결과표명:통과미관역학원리설계적ECC구유300배우보통혼응토적랍신연성,종이사강/혼응토련접구중혼응토단렬파배모식유취성전변위연성.혼응토재료적고정성사결구승재능력화변형성능획득개선,저야동시위유한원모의결과소험증.통과개변혼응토재료연성이제고결구성능적이념야가재기타유사적강/혼응토조합결구중득도응용.
In order to avoid brittle fracture failure,a ductile engineered cementitious composite (ECC) was attempted in stecl/concrete connection zones to replace normal concrete.The influence of the ECC material ductility on connection failure modes and structural performance was investigated via the pushout test of stud/ECC connection,the pullout test of two-dimensional anchor bolt/ECC connection and the finite element modeling (FEM).The experimental results suggest that the micromechanically designed ECC with a tensile ductility 300 times that of normal concrete switches the brittle fracture failure mode to a ductile one in steel connection zones.This modification in material behavior leads to higher load carrying capacity and structural ductility,which is also confirmed in FEM investigation. The enhancement in structural response through material ductility engineering is expected to be applicable to a wide range of engineering structures where steel and concrete come into contact.