本文選題：CFRP + RPC　； 參考：《長沙理工大學》2015年碩士論文

【摘要】：纖維增強復合材料FRP(Fiber Reinforced Polymer/Plastic)筋以其強度高、重量輕、免銹蝕和抗疲勞性能好等優(yōu)異性能極有希望成為處于惡劣自然環(huán)境下混凝土結(jié)構(gòu)中傳統(tǒng)鋼筋的潛在替代品。FRP筋與混凝土能否正常工作,兩者的界面粘結(jié)性是關(guān)鍵的技術(shù)問題。目前國內(nèi)外針對FRP筋混凝土界面靜力粘結(jié)性能研究已取得豐富的成果,而針對FRP筋混凝土界面的疲勞粘結(jié)性能研究較少,為了使其研究成果進一步完善,對FRP筋混凝土界面的疲勞粘結(jié)性能及相應的壽命預測值具有重大的實用價值。本文依托國家自然科學基金資助項目對FRP筋活性粉末混凝土(RPC)界面的疲勞粘結(jié)性能進行了試驗研究。主要的研究內(nèi)容及其相應的研究成果如下:(1)根據(jù)常幅荷載作用下CFRP筋混凝土界面疲勞性能的試驗研究,得到荷載循環(huán)次數(shù)、錨固長度、應力水平和應力幅值對CFRP筋粘結(jié)式錨具組裝件的荷載滑移曲線和鋼套筒應變的影響,探究了疲勞荷載對CFRP筋軸向動應變的影響,對比了疲勞前后粘結(jié)式錨具組裝件靜載試驗的破壞形式、極限承載力、荷載滑移曲線、CFRP筋剛度和鋼套筒應變等,最后得到了疲勞壽命預測曲線和臨界錨固長度計算式。(2)結(jié)合公路橋梁的隨機變幅疲勞荷載譜,研究了隨機疲勞荷載作用下CFRP筋混凝土界面的疲勞性能,得到荷載循環(huán)次數(shù)和錨固長度對對粘結(jié)式錨具組裝件的荷載滑移曲線和鋼套筒應變的影響,探究了隨機循環(huán)疲勞荷載對CFRP筋軸向動應變的影響,通過隨機疲勞后的靜載試驗對比了疲勞前后粘結(jié)式錨具組裝件的破壞形式、極限承載力、荷載滑移曲線、CFRP筋剛度和鋼套筒應變等,最后得到了隨機疲勞壽命預測曲線、臨界錨固長度計算式和CFRP筋的疲勞損傷演化規(guī)律。(3)采用ANSYS對粘結(jié)式錨具組裝件的疲勞性能進行了分析。研究了錨固長度、應力水平和應力幅值對組裝件疲勞壽命的影響,對比試驗結(jié)果在一定程度上驗證了該理論分析的正確性。
[Abstract]:Fiber reinforced composite FRP(Fiber Reinforced polymer / plastic tendons are high in strength and light in weight. It is very promising to be a potential substitute for the traditional reinforcement in the harsh natural environment. The interfacial bond between the FRP bars and the concrete is a key technical problem. At present, the research on the static bond behavior of FRP reinforced concrete interface has made a lot of achievements at home and abroad, but there are few researches on the fatigue bond performance of FRP reinforced concrete interface, in order to further improve the research results. It is of great practical value to the fatigue bond performance and the corresponding life prediction value of FRP reinforced concrete interface. In this paper, the fatigue bond properties of FRP reinforced reactive powder concrete (RPC) interface are studied with the aid of National Natural Science Foundation. The main research contents and corresponding research results are as follows: (1) based on the experimental study of the interface fatigue behavior of CFRP reinforced concrete under constant amplitude loading, the load cycle times and anchoring length are obtained. The effects of stress level and stress amplitude on the load-slip curve and the steel sleeve strain of the CFRP bar bonded Anchorage assembly are investigated. The effect of fatigue load on the axial dynamic strain of the CFRP bar is investigated. The failure modes, ultimate bearing capacity, load slip curve, CFRP bar stiffness and steel sleeve strain of bonded Anchorage assembly before and after fatigue are compared. Finally, the fatigue life prediction curve and the critical Anchorage length formula are obtained. Combined with the random variable amplitude fatigue load spectrum of highway bridges, the fatigue behavior of CFRP reinforced concrete interface under random fatigue load is studied. The effects of load cycle times and anchoring length on load-slip curve and steel sleeve strain of bonded Anchorage assembly are obtained. The effect of random cyclic fatigue load on axial dynamic strain of CFRP bars is investigated. The failure form, ultimate bearing capacity, load slip curve, CFRP bar stiffness and steel sleeve strain of bonded anchors before and after fatigue were compared by static load test after random fatigue. Finally, the prediction curve of random fatigue life was obtained. The critical Anchorage length and fatigue damage evolution of CFRP bars are calculated. The fatigue behavior of bonded Anchorage assembly is analyzed by ANSYS. The effects of anchoring length, stress level and stress amplitude on the fatigue life of the assembly are studied. The correctness of the theoretical analysis is verified to some extent by comparing the experimental results.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：1819939