【摘要】：沿海環(huán)境下的鋼筋混凝土(RC)結(jié)構處于荷載作用和環(huán)境作用同時存在的工作狀態(tài)且在正常條件下會出現(xiàn)不同程度的荷載損傷。為了在實驗室內(nèi)模擬其工作狀態(tài),對RC梁試件施加幅值分別為0.3P_u、0.4P_u、0.5P_u、0.6P_u和0.7P_u(P_u為單調(diào)加載梁的極限荷載)的初始荷載造成不同程度的損傷,經(jīng)歷120次海水干濕循環(huán)作用后,進行單調(diào)加載試驗測試剩余力學性能,并對梁試件鉆芯取樣測試不同位置及深度處混凝土的氯離子含量。試驗結(jié)果表明,不同程度初始損傷RC梁經(jīng)歷120次海水干濕循環(huán)后,其屈服荷載、極限荷載和延性均隨初始荷載幅值的增加而降低;與無損傷梁試件相比,當初始損傷荷載為0.4P_u時,梁試件的屈服荷載和極限荷載降幅分別為10.4%和7.9%,隨著初始荷載增大,屈服荷載和極限荷載快速下降,當初始損傷荷載為0.7P_u時,屈服荷載和極限荷載降幅分別達33.7%和32.4%。氯離子含量測試結(jié)果表明,梁試件混凝土受拉區(qū)氯離子含量均大于受壓區(qū)氯離子含量;當初始損傷荷載小于0.5P_u時,受拉鋼筋表面混凝土的氯離子含量差別不大且小于0.1%,當初始損傷荷載為0.7P_u時,鋼筋表面氯離子含量最大達到0.14%。可見,初始荷載損傷與海水干濕循環(huán)綜合作用對RC梁力學性能及耐久性劣化影響顯著。
[Abstract]:The reinforced concrete (RC) structure in coastal environment is in the working state of both loading and environmental action, and under normal conditions, there will be different degrees of load damage. In order to simulate its working state in the laboratory, the RC beam specimen was subjected to a magnitude of 0.3Pu / 0.4PuS / 0.5Pu respectively. The initial load of 0.6P_u and 0.7P_u (the ultimate load of a monotone loaded beam) caused varying degrees of damage. After 120 cycles of dry and wet seawater, the residual mechanical properties were tested by monotonic loading test. The chloride content of concrete at different positions and depths was measured by drilling core sampling of beam specimen. The experimental results show that the yield load, ultimate load and ductility of RC beams with different degrees of initial damage decrease with the increase of initial load amplitude after 120 dry and wet cycles in seawater. When the initial damage load is 0.4P_u, the yield load and ultimate load decrease by 10.4% and 7.9%, respectively. With the increase of initial load, the yield load and ultimate load decrease rapidly. When the initial damage load is 0.7P_u, the yield load and ultimate load decrease by 33.7% and 32.4% respectively. The results show that the chloride content in the tensile zone is higher than that in the compression zone. When the initial damage load is less than 0.5P_u, the chloride content of the concrete on the surface of the tensile steel bar is less than 0.1. When the initial damage load is 0.7P_u, the content of chloride ion on the surface of the steel bar reaches 0.14%. It can be seen that the combined effects of initial load damage and seawater dry and wet cycle have a significant effect on the mechanical properties and durability deterioration of RC beams.
【作者單位】： 北京航空航天大學交通科學與工程學院;華南理工大學亞熱帶建筑科學國家重點實驗室;
【基金】：國家自然科學基金(51578031) 亞熱帶建筑科學國家重點實驗室(2016ZA03)~~
【分類號】：TU37

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