600MPa級高強鋼筋連接錨固性能試驗及計算方法研究
發(fā)布時間:2020-05-15 15:43
【摘要】:600MPa級熱軋帶助高強鋼筋作為一種新型建筑材料,憑借其優(yōu)良的特性,很好地適應(yīng)了現(xiàn)代工程的需要,且符合人們對建筑行業(yè)可持續(xù)發(fā)展及綠色建材的要求,其與混凝土的粘結(jié)錨固問題是推廣應(yīng)用高強鋼筋的關(guān)鍵問題。學(xué)者們曾進行過很多關(guān)于高強鋼筋與混凝土粘結(jié)錨固性能方面的研究,但主要集中于普通鋼筋以及強度在500MPa及以下鋼筋,而對更高強度鋼筋與混凝土粘結(jié)錨固性能的研究比較缺乏。隨著中國大力推廣高強鋼筋,HRB500鋼筋已經(jīng)編入現(xiàn)行《混凝土結(jié)構(gòu)設(shè)計規(guī)范》(GB50010-2010),600MPa高強鋼筋的推廣使用也是勢在必行。高強鋼筋因設(shè)計強度明顯高于普通鋼筋,所需錨固力遠遠高于普通鋼筋,有必要針對600MPa高強鋼筋與混凝土之間粘結(jié)錨固性能進行研究。本文針對600MPa級鋼筋與混凝土之間的黏結(jié)錨固性能,通過414個連接錨固試件,其中273個拉拔試件和141個對拉試件進行試驗,分析了錨固長度、配箍率、保護層厚度、鋼筋直徑、混凝土強度、彎錨角度和機械錨固方式對錨固性能的影響。通過對試驗數(shù)據(jù)的統(tǒng)計回歸分析,得出了600MPa級高強鋼筋與混凝土之間的連接錨固極限黏結(jié)強度的計算公式。主要工作總結(jié)如下:1)開展了141個600MPa級熱軋高強鋼筋連接試驗,研究參數(shù)為搭接長度、配箍率、保護層厚度、鋼筋直徑、混凝土等級、焊接方式和套筒類型。詳細考察了不同錨固下高強鋼筋的力學(xué)性能和破壞模式。2)通過對四種搭接連接方式分別是,綁扎連接、焊接連接、套筒連接、和閃光焊接連接試驗數(shù)據(jù)的統(tǒng)計回歸分析,得出了600MPa級高強鋼筋與混凝土之間的連接錨固極限黏結(jié)強度的計算公式。3)開展了273個600MPa級熱軋高強鋼筋粘結(jié)錨固試驗,研究參數(shù)為錨固長度、配箍率、保護層厚度、鋼筋直徑、混凝土等級、彎錨角度和機械錨固方式。詳細考察了不同錨固下高強鋼筋的力學(xué)性能和破壞模式。4)通過對五種粘結(jié)錨固分別是直錨,彎錨,螺栓錨,單側(cè)焊條錨,雙側(cè)焊條錨試驗數(shù)據(jù)的統(tǒng)計回歸分析,得出了600MPa級高強鋼筋與混凝土之間的連接錨固極限黏結(jié)強度的計算公式。
【圖文】:
Hefei University of Technology MASTER’S DISSERTATIONens Designonfined and confined HSSB specimens were tested. Confinedtirrup reinforcement through the nodal zone while unconfinednothing but the tensile tie steel in the nodal zone region. sts are performed considering the bar diameter, concrete cirrup ratio, cover size and mechanical connection types, as test e connection performance of Grade 600MPa high strength steeists of various types of mechanical connection in 4 categoriesimens, contact lab splice and welded lab splice divided in 5 m. The specific dimensions are shown in Table2.1~Table2.4ng the bond-anchorage length were obtained from 3-5 strg2.5).
Fig 4 7 Framwork of specimens圖 4.7 試件設(shè)計圖The specimens details are shown in Table 2 and Table 4. When processing thspecimens, first frameworks were made, then the steel bars were placed, and finallthe concrete were poured. After the pouring is completed, they were kept in thlaboratory for 28 days to ensure the concrete strength meets the requirements. Thconcrete strength is the same batch of concrete in each set 3 prisms were made for thaverage analysis of the test.The strength of the steel bars is determined by the tensile test. Taken 3 specimenof the same batch of steel bars were taken to analysis the test average values.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2019
【分類號】:TU375
本文編號:2665268
【圖文】:
Hefei University of Technology MASTER’S DISSERTATIONens Designonfined and confined HSSB specimens were tested. Confinedtirrup reinforcement through the nodal zone while unconfinednothing but the tensile tie steel in the nodal zone region. sts are performed considering the bar diameter, concrete cirrup ratio, cover size and mechanical connection types, as test e connection performance of Grade 600MPa high strength steeists of various types of mechanical connection in 4 categoriesimens, contact lab splice and welded lab splice divided in 5 m. The specific dimensions are shown in Table2.1~Table2.4ng the bond-anchorage length were obtained from 3-5 strg2.5).
Fig 4 7 Framwork of specimens圖 4.7 試件設(shè)計圖The specimens details are shown in Table 2 and Table 4. When processing thspecimens, first frameworks were made, then the steel bars were placed, and finallthe concrete were poured. After the pouring is completed, they were kept in thlaboratory for 28 days to ensure the concrete strength meets the requirements. Thconcrete strength is the same batch of concrete in each set 3 prisms were made for thaverage analysis of the test.The strength of the steel bars is determined by the tensile test. Taken 3 specimenof the same batch of steel bars were taken to analysis the test average values.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2019
【分類號】:TU375
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