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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    房建材料及制品

    SFRC/SCC鋼筋復合梁受彎性能試驗研究
    SFRC/SCC鋼筋復合梁受彎性能試驗研究
    • 蘇 駿1,2,錢維民1,柯 驕1
    2021年第5期
    摘要
    引用本文
    摘 ? 要:設計了一批受拉區為SFRC、受壓區為SCC的鋼筋復合梁,分析了縱筋配筋率、SFRC替換層鋼纖維體積摻量以及替換層高度對復合梁在四點彎曲荷載作用下的承載力、撓度以及裂縫形態的影響,并與普通混凝土梁進行了對比。通過理論分析計算得出了SFRC/SCC復合梁的承載力表達式,并將理論計算結果與試驗數據進行了對比分析,以驗證表達式的合理性。結果表明:配筋率是提升復合梁承載力的首要因素,1.32%配筋率相對于0.79%配筋率的極限承載力最大可提升24.1%;鋼纖維替換層對復合梁的承載力提升并不明顯,但對于復合梁的撓度與裂縫寬度控制有明顯作用,將替換層高度由50 mm提升至150 mm時,復合梁的撓度和主裂縫寬度最大分別降低了9.2%和77.81%。 Abstract: A batch of reinforced composite beams with SFRC tension zone and SCC compression zone were designed, and the effects longitudinal reinforcement ratio, SFRC replacement layer steel fiber volume content and replacement layer height on the bearing capacity, deflection and crack shape of composite beams under the four-point bending load were analyzed, and compared with ordinary concrete beams. Through theoretical analysis and calculation, the expression of the bearing capacity of SFRC/SCC composite beams was obtained, and the theoretical calculation results were compared with the experimental datas to verify the rationality of the expression. The results show that the reinforcement ratio is the primary factor to improve the bearing capacity of composite beams. Compared with the reinforcement ratio of 0.79%, the ultimate bearing capacity can be increased by 24.1% at the maximum reinforcement ratio of 1.32%. The steel fiber replacement layer does not significantly improve the bearing capacity of composite beams, but it has an obvious effect on the deflection and crack width control of composite beams. When the replacement layer height is increased from 50 mm to 150 mm, the deflection and main crack width of composite beams are reduced by 9.2% and 77.81% respectively.
    蘇駿,錢維民,柯驕.SFRC/SCC鋼筋復合梁受彎性能試驗研究[J].混凝土與水泥制品,2021(5):60 -64,70. SU J,QIAN W M,KE J.Experimental Study on the Flexural Performance of SFRC/SCC Reinforced Composite Beams[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):60 -64,70.
    無腹筋混凝土受剪梁聲發射灰色理論預測模型
    無腹筋混凝土受剪梁聲發射灰色理論預測模型
    • 李向陽,秦擁軍,呂旭濱
    2021年第5期
    摘要
    引用本文
    摘 ? 要:建立了無腹筋混凝土梁受剪破壞中聲發射現象的聲發射灰色預測模型,并采用修正方法對模型進行了修正。結果表明:采用兩次修正、調整系數a和一次修正三種方法引入修正系數對GM(1,1)模型的預測精度有較大提高,對聲發射(AE)累計事件數的數值預測效果有較好的擬合性,AE累計事件數變化趨勢的預測結果與試驗結果之間的差異較小,可以實現對無腹筋混凝土梁受剪破壞的判別與預測。 Abstract: The grey theory prediction model of acoustic emission in shear failure of concrete beams without abdominal reinforcement was established, and the model was modified by the modified method. The results show that the prediction accuracy of GM (1,1) model is greatly improved by using the three methods of two corrections, adjustment coefficient a and one correction to introduce correction coefficients, and the acoustic emission(AE) accumulative total number of the numerical prediction results have good fitting, and the difference between the predicted results and experimental results of AE accumulative events ?change trend is low, which can realize the discrimination and prediction of the shear failure of concrete beams without abdominal reinforcement.
    李向陽,秦擁軍,呂旭濱.無腹筋混凝土受剪梁聲發射灰色理論預測模型[J].混凝土與水泥制品,2021(5):65-70. LI X Y,QIN Y J,LYU X B.Grey Theory Prediction Model of Acoustic Emission of Concrete Beam Without Abdominal Reinforcement[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):65-70.
    預制高強硅酸鹽墻板力學性能試驗研究
    預制高強硅酸鹽墻板力學性能試驗研究
    • 謝國慶,任 虎,羅 雙,付汝賓,孔德文
    2021年第5期
    摘要
    引用本文
    摘 ? 要:研究了高強硅酸鹽墻板的抗壓性能及破壞形態,提出了標準試塊受壓應力-應變本構方程,通過ABAQUS有限元軟件進行了數值模擬,并與試驗結果進行了對比。結果表明:標準試塊受壓應力-應變全過程曲線的形狀和普通混凝土相似,峰值應力前曲線接近直線,達到峰值應力后,應力迅速跌落;可采用二段式曲線擬合高強硅酸鹽墻板標準試塊的單軸受壓應力-應變關系,得出其本構模型;試件的破壞形態為脆性破壞,延性較差,抗壓試件破壞時兩板面出現豎向裂縫,兩孔間肋出現豎向裂縫和斜裂縫;試件承載力較高,滿足現有規范對建筑用隔墻條板的強度要求。 Abstract: The compressive properties and failure mode of high-strength silicate wallboards were studied, and the stress-strain constitutive equation of the standard test block was put forward. The numerical simulation was carried out by ABAQUS finite element software, and the results were compared with the experimental results. The result shows that the shape of the compressive stress-strain entire process curve of the standard test block is similar to that of ordinary concrete, and it increases approximately linearly before reaching the peak stress, and drops rapidly after reaching the peak stress. The two-section curve can be used to fit the uniaxial compressive stress-strain relationship of the standard test block of the wallboard, and its constitutive model is given. The failure mode of the specimen is brittle failure with poor ductility, and when the compressive specimen is damaged, vertical cracks appear on the two plates, and vertical cracks and oblique cracks appear on the ribs between the two hole ribs. The bearing capacity of the specimen is high, which can meet the strength requirements of the existing codes for artition board used in buildings.
    謝國慶,任虎,羅雙,等.預制高強硅酸鹽墻板力學性能試驗研究[J].混凝土與水泥制品,2021(5):71-75. XIE G Q,REN H,LUO S,et al.Experimental Study on Mechanical Properties of Prefabricated High-strength Silicate Wallboards[J].CHINA CONCRETE AND CEMENT
    圓鋼管微膨脹陶?;炷炼讨S壓極限承載力計算公式
    圓鋼管微膨脹陶?;炷炼讨S壓極限承載力計算公式
    • 李 秀1,朱紅兵2,韓 帥2
    2021年第5期
    摘要
    引用本文
    李秀,朱紅兵,韓帥.圓鋼管微膨脹陶?;炷炼讨S壓極限承載力計算公式[J].混凝土與水泥制品,2021(5):76-79. LI X,ZHU H B,HAN S.Ultimate Bearing Capacity Calculation Formula of Micro-expansive Ceramsite Concrete Steel Tubular Short Column Under Axial Compression[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):76-79.
    纖維增強混凝土耗能墻-鋼筋混凝土框架結構抗震性能數值研究
    纖維增強混凝土耗能墻-鋼筋混凝土框架結構抗震性能數值研究
    • 張妍青1,呂高勇2
    2021年第5期
    摘要
    引用本文
    摘 ? 要:在高性能纖維增強混凝土(HPFRC)耗能墻-鋼筋混凝土(RC)框架結構抗震性能試驗研究的基礎上,考慮了RC框架混凝土強度等級、框架柱配筋率、框架柱截面尺寸三個因素,進行了有限元模擬分析。結果表明:建立的HPFRC耗能墻-RC框架結構有限元模型較為準確,有限元計算結果與試驗結果吻合較好;隨著RC框架混凝土強度等級的提升,試件各個荷載特征點的水平承載力均有所提高,但變形能力變化不大;隨著框架柱配筋率和框架柱截面尺寸的增大,試件各個荷載特征點的水平承載力均明顯提高,極限位移也有所增加;為了保證此類結構的抗震性能,針對RC框架混凝土強度等級、框架柱配筋率和框架柱截面尺寸,提出了可供設計參考的相關建議值。 Abstract: Based on the experimental study on seismic performance of high performance fiber reinforced concrete (HPFRC) energy dissipation wall-reinforced concrete (RC) frame structure, three factors of RC frame concrete strength grade, frame column reinforcement ratio, and frame column section size were considered to carried out finite element simulation analysis. The results show that the established finite element model of HPFRC energy dissipation wall-RC frame structure is accurate, and the finite element calculation results are in good agreement with the experimental results. With the increase of the RC frame concrete strength grade, the horizontal bearing capacity of each load characteristic point of the specimen is improved, but the deformation capacity changes little. With the increase of the frame column reinforcement ratio and the frame column section size, the horizontal bearing capacity of each load characteristic point of the specimen is significantly increased, and the ultimate displacement is also increased. In order to ensure the seismic performance of this kind of structure, the relevant recommended values for design reference are put forward for the RC frame concrete strength grade, frame column reinforcement ratio and frame column section size.
    張妍青,呂高勇.纖維增強混凝土耗能墻-鋼筋混凝土框架結構抗震性能數值研究[J].混凝土與水泥制品,2021(5):80-84. ZHANG Y Q,LYU G Y.Numerical Study on Seismic Performance of HPFRC Energy Dissipation Wall-RC Frame Structure[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):80-84.
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