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  本文關鍵詞：CFRP板加固混凝土梁受彎性能試驗研究　出處：《河北工業(yè)大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： CFRP板 加固效率 錨固方式 錨固裝置 受彎性能

【摘要】：近年來，國民經濟高速發(fā)展，交通量急速增長，在大量新公路橋梁建設的同時，由于年久失修，原設計標準低，不滿足現行交通量與車載重量等原因，許多舊橋正逐漸成為病橋、危橋，嚴重阻礙了地區(qū)經濟發(fā)展。因此，研究開發(fā)造價低，技術效果好的橋梁結構加固技術并投入使用對于推動我國的公路建設具有重要意義。 CFRP板加固橋梁結構是近幾年才展開研究的一項加固技術，但CFRP板加固技術存在的一個關鍵問題是CFRP板的加固效率問題。本文設計了4根試驗梁，其中1根為對比梁，3根為CFRP板的不同錨固方式的加固梁。針對目前使用的錨具制作成本高、不易加工、對CFRP板容易造成損傷且錨固力低等問題，本文設計了一種綜合膠體粘結、鋼板夾持、CFRP板穿孔的混合錨固方式的梁端錨固裝置，并總結了CFRP板加固的施工工藝。深入分析了荷載值與混凝土應變、鋼筋應變、CFRP板應變、試驗梁撓度的關系，并研究了CFRP板的利用效率、試驗梁的剛度和延性，最后對CFRP板的剝離理論進行了深入分析。 研究結果表明，CFRP板加固混凝土梁的開裂荷載略有提高但不顯著，但是對試驗梁的屈服荷載和極限荷載卻有30%左右的提高幅度。對于抑制鋼筋應變和混凝土受壓區(qū)應變的增長、提高CFRP板的強度利用率、限制裂縫寬度、減小裂縫間距方面，CFRP板的內嵌式錨固方式最為有效，其次是CFRP板的鋼板壓條錨固方式。所有加固梁的延性較對比梁都不同程度降低，U型箍錨固方式的加固梁降低最多，，其次是鋼板壓條錨固方式。CFRP板加固對抑制試驗梁前期撓度增加作用不明顯，對減小試驗梁的后期撓度效果顯著。梁端錨具很好的限制了CFRP板的滑移和延遲CFRP板的剝離，顯著提高了加固梁的受彎性能。
[Abstract]:In recent years, with the rapid development of national economy and the rapid growth of traffic volume, while a large number of new highway and bridge construction, due to old disrepair, the original design standards are low, not to meet the current traffic volume and vehicle weight and other reasons. Many old bridges are becoming sick bridges and dangerous bridges, which seriously hinder the development of regional economy. Therefore, the cost of research and development is low. It is of great significance for the highway construction of our country to use and put into use the bridge structure strengthening technology with good technical effect. Strengthening bridge structure with CFRP slab is a reinforcement technique that has been studied in recent years. However, one of the key problems in the strengthening technology of CFRP plate is the efficiency of strengthening CFRP slab. In this paper, four test beams are designed, one of which is a contrast beam. Three reinforced beams with different anchoring methods for CFRP plate. Aiming at the problems of high production cost and difficult to be processed, CFRP plate is easily damaged and the anchoring force is low. In this paper, a hybrid anchoring device for composite colloidal bonding and steel plate clamping with perforated CFRP plates is designed. The relationship between the load value and the strain of concrete, the strain of steel bar, the deflection of test beam is analyzed, and the utilization efficiency of CFRP slab is also studied. The stiffness and ductility of the test beam are analyzed. Finally, the peeling theory of CFRP plate is analyzed. The results show that the cracking load of concrete beams strengthened with CFRP plates is slightly increased but not significant. However, the yield load and ultimate load of the test beam are increased by about 30%. The strength utilization ratio of CFRP slab can be improved by restraining the growth of the strain of steel bar and the strain of concrete compression zone. To limit the crack width and reduce the crack spacing, the embedded anchoring method of CFRP plate is the most effective. The ductility of all the strengthened beams is lower than that of the contrast beams to some extent, the reduction of the reinforced beams with U-type hoop Anchorage is the most. Secondly, the reinforcement of steel strip anchoring method, CFRP plate has no obvious effect on the pre-deflection increase of test beam. Anchorage at the end of the beam limits the slip of the CFRP plate and the delay-delamination of the CFRP plate, and improves the flexural behavior of the strengthened beam.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.72

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本文編號：1388919