房建材料及制品_2020_《混凝土與水泥制品》雜志社

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房建材料及制品

設縱向加勁肋后矩形鋼管混凝土柱屈曲機制分析及構造建議

李肖1，張元植2

2020年3期

摘要

引用本文

摘? ?要：針對搜集的38根設肋試件的軸壓試驗結果，采用ABAQUS進行了有限元計算。計算結果表明，軸壓承載力與試驗軸壓承載力誤差在7%以內，破壞模式與試驗破壞模式吻合較好。根據相關試驗數據，對加勁肋的工作機理及受力狀態進行了分析。分析結果表明，平板加勁肋截面抗彎剛度對試件承載力有明顯的影響，應選取合適加勁肋抗彎剛度及截面尺寸，才能既使組合構件的承載性能得到有效發揮，同時用鋼量得到合理優化；鋼管屈曲模式受加勁肋剛度的影響較大，隨著加勁肋剛度的增大，鋼管板件逐漸由在板件橫向的一個半波轉變為兩個半波；當加勁肋剛度達到臨界剛度后，加勁肋截面面積不再影響鋼管屈曲模式，但試件的軸壓承載力隨加勁肋面積的增大而增大。 ? Abstract:?According to the results of the axial compression test of 38 specimens with ribs, finite element calculations were performed using ABAQUS. The calculation results show that the error between the axial compression bearing capacity and the test axial compression bearing capacity is within 7%, and the failure mode is in good agreement with the test failure mode. The working mechanism and stress state of the stiffeners were analyzed based on test data. The analysis results show that the flexural stiffness of longitudinal stiffener has a significant effect on the bearing capacity of the specimen. Appropriate flexural stiffness and cross-section dimensions of longitudinal stiffener should be selected so that the bearing performance of the composite component can be effectively exerted and the steel consumption can be reasonably optimized. The local buckling mode of steel tube is notably influenced by flexural stiffness of longitudinal stiffener, and with the increase of the stiffness of the stiffeners, the steel pipe plate gradually changes from one half wave to two half waves in the transverse direction of the plate. When the stiffness of the longitudinal stiffener reaches the critical stiffness, the local buckling mode of steel tube can not be influenced by the cross section of longitudinal stiffener anymore, but the compression load carrying capacity of specimens increased with the increase of the area of cross section of longitudinal stiffener.

李肖,張元植.設縱向加勁肋后矩形鋼管混凝土柱屈曲機制分析及構造建議[J].混凝土與水泥制品,2020(3):60-64,69. LI X,ZHANG Y Z.Numerical Simulation on Axial Compression Mechanical Behavior of Rectangular Section CFT Columns with Longitudinal Stiffeners[J].China Concrete and Cement Products,2020(3):60-64,69.

定形PEG/SiO<sub>2</sub> /石墨復合相變蓄熱混凝土制備及性能研究

定形PEG/SiO₂ /石墨復合相變蓄熱混凝土制備及性能研究

王永偉1，李文麗2

2020年3期

摘要

引用本文

摘要: 為制備性能優異的相變蓄熱混凝土，試驗確定了定形PEG/SiO₂ /石墨復合相變蓄熱骨料中相變材料的組成比例和制備工藝，并研究了相變蓄熱骨料對混凝土力學性能和熱工性能的影響。結果表明，相變材料中PEG含量為80%，石墨摻量為6%時，相變材料在具有合適相變溫度和相變焓的同時，有良好的導熱性能；相變蓄熱骨料的合適吸附時間和溫度分別為3h和80 ℃，經表面封裝后的相變蓄熱骨料具有優異的穩定性。相變蓄熱骨料雖然降低了混凝土的抗壓強度和導熱系數，但延緩了水泥水化熱造成的溫度升高，延緩了放熱速率，能防止溫度應力造成的混凝土開裂，且能明顯改善混凝土的儲熱性能，綜合考慮相變蓄熱骨料替代率不宜大于80%。 Abstract：In order to prepare the excellent phase transition thermostorage concrete, the composition ratio and preparation technology of the phase transition material in the fixed form PEG/SiO₂ /graphite composite phase transition thermostorage concrete were determined by experiment, and the influence of phase transition thermostorage concrete on the mechanical properties and thermal properties of concrete was studied. The results show that when the PEG content in the phase transition material is 80 % and the graphite content is 6 %, the phase transition material has good thermal conductivity at the same time as suitable phase transition temperature and phase transition enthalpy. The suitable adsorption time and temperature of the phase transition thermostorage concrete are 3 h and 80 °C respectively. The phase transition thermostorage concrete after surface encapsulation has excellent stability. Although the phase transition thermostorage concrete reduces the compressive strength and thermal conductivity of the concrete, it delays the temperature increase caused by the hydration heat of the cement, delays the heat release rate, prevents the concrete cracking caused by the temperature stress, and can significantly improve the concrete heat storage performance. The substitution rate of thermostorage aggregate should not be greater than 80 %.

王永偉,李文麗.定形PEG/SiO₂/石墨復合相變蓄熱混凝土制備及性能研究[J].混凝土與水泥制品,2020(3):65-69. WANG Y W,LI W L.Study on Preparation and Properties of Stationary PEG/SiO₂/Graphite Composite Phase Transition Thermostorage Concrete[J].China Concrete and Cement Products,2020(3):65-69.

雙摻礦物摻合料輕骨料混凝土性能試驗研究

侯景鵬，劉俊龍，史巍，張騰

2020年3期

摘要

引用本文

摘??要：試驗研究了粉煤灰、礦渣粉復合摻合料對LC30頁巖陶粒輕骨料混凝土坍落度、抗壓強度、抗凍融性能、抗碳化性能和自由收縮性能的影響規律。結果表明：總摻量不變時隨著粉煤灰相對摻量的增加，坍落度逐漸增加；礦物摻合料提高了混凝土后期抗壓強度，總摻量為30%、粉煤灰礦渣粉摻入比例2∶3時28d抗壓強度高于基準試驗組14.3%；總摻量一定時摻入比例為2∶3的試驗組，混凝土抗凍性能、抗碳化性能和抗自由收縮性能最佳；摻入比例一定時，摻量為30%的試驗組的力學性能和耐久性能更優。?Abstract:?Theeffectsofflyashandslagpowdercompoundadmixturesontheslump,compressivestrength,freeze-thawresistance,carbonationresistanceandfreeshrinkageperformanceofLC30shaleceramsiteconcretewerestudied.Theresultsshowthatwiththeincreaseofrelativeamountofflyash,theslumpsincreasegradually.Mineraladmixturescanincreasethelong-timeconcretestrength.Whentheamountofadmixturesis30%andtheflyash-slagpowderratiois2∶3,thecompressivestrengthat28dayis14.3%higherthanthatofthereferencegroup.Thetestgroupswiththeflyash-slagpowderratioof2∶3foracertainamountoftotaladmixtureshavethebestanti-freeze,carbonationandfreeshrinkageproperties.Theconcretegroupswith30%mineraladmixtureshavebettermechanicalanddurabilityproperties.

侯景鵬,劉俊龍,史巍,等.雙摻礦物摻合料輕骨料混凝土性能試驗研究[J].混凝土與水泥制品,2020(3):70-72,90. HOU J P,LIU J L,SHI W,et al.Research of Compound Mineral Admixtures on Performance of Lightweight Aggregate Concrete[J].China Concrete and Cement Products,2020(3):70-72,90.

耐堿玻璃纖維編織網混凝土梁抗彎性能研究

凌苛苛，曹寶珠，董金爽，宋文濤

2020年3期

摘要

引用本文

摘要: 提出了采用耐堿GFRP編織網替代傳統鋼筋在混凝土梁中作為受力骨架的新型結構形式。為研究該類型結構的力學性能，設計了3根試件，對其進行三分點加載，觀察其受力全過程及破壞特征，分析其破壞模式。在試驗研究的基礎上，采用ABAQUS有限元軟件進行了混凝土強度參數對其力學性能影響的參數分析。試驗及數值模擬結果表明：配筋率對耐堿GFRP混凝土梁的受彎性能影響較大；隨著混凝土強度的提升，梁的承載力雖有所提升，但撓度降低。
Abstract：A new type of structure using alkali-resistant GFRP textile instead of traditional steel bars as stress skeleton in concrete beams was put forward. In order to study the mechanical properties of this type of structure, three specimens were designed and loaded at three points, and the whole process of loading and failure characteristics were observed, and the failure modes were analyzed. On the basis of the test, the influence of concrete strength parameters on its mechanical properties was analyzed by ABAQUS finite element software. The results show that the reinforcement ratio has a great influence on the flexural performance of alkali-resistant GFRP concrete beams. With the increase of concrete strength, the bearing capacity of the beams increases, while the deflection decreases.

凌苛苛,曹寶珠,董金爽,等.耐堿玻璃纖維編織網混凝土梁抗彎性能研究[J].混凝土與水泥制品,2020(3):73-76.
LING K K,CAO B Z,DONG J S,et al.Study of Flexural Behavior of Concrete Beams with Alkali-resistant GFRP Textile[J].China Concrete and Cement Products,2020(3):73-76.

多層石墨烯/鋼纖維砂漿的制備及力學性能研究

韓瑞杰1,2；程忠慶2，高屹2，薛子剛2,3

2020年3期

摘要

引用本文

摘??要：研究了不同摻入工藝下多層石墨烯和鋼纖維在水泥基中的分散效果，并對單摻、復摻兩種填料下砂漿的抗壓、抗折強度和壓折比進行了試驗研究。結果表明：采用干拌法分散鋼纖維和高速離心法分散多層石墨烯的工藝更佳；鋼纖維和多層石墨烯的協同作用提高了高摻量多層石墨烯砂漿的抗壓和抗折強度，其中復摻鋼纖維和多層石墨烯砂漿的28d抗壓強度比單摻多層石墨烯提高32.82%～43.96%，抗折強度提高18.33%～31.08%，且提高程度隨著鋼纖維摻量的增加而上升。?Abstract:?Thedispersioneffectsofmulti-layergrapheneandsteelfibersincementmatrixunderdifferentmixingprocesseswerestudied.Thecompressivestrength,flexuralstrengthandcompressive-flexuralratioofmortarwithsingleandcompoundfillersweretested.Theresultsshowthattheprocessofdispersingmulti-layergraphenebydrymixingandhigh-speedcentrifugationisbetter.Thesynergisticeffectofsteelfiberandmulti-layergrapheneimprovesthecompressiveandflexuralstrengthofhighcontentmulti-layergraphenemortar,inwhichthe28dcompressivestrengthofthemortarmixedwithsteelfiberandmult-ilayergraphene?is32.82%～43.96%higherthanthatofmult-ilayergraphenealone,andtheflexuralstrengthis18.33%～31.08%higherthanthatofmult-ilayergraphenealone,andthedegreeofimprovementincreaseswiththeincreaseofsteelfibercontent.

韓瑞杰,程忠慶,高屹,等.多層石墨烯/鋼纖維砂漿的制備及力學性能研究[J].混凝土與水泥制品,2020(3):77-81.
HAN R J,CHENG Z Q,Gao Y,et al.Study on Preparation and Mechanical Properties of Multi-layer Graphene/steel Fiber Mortar[J].China Concrete and Cement Products,2020(3):77-81.

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