房建材料及制品_2020_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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房建材料及制品

设纵向加劲肋后矩形钢管混凝土柱屈曲机制分析及构造建议

李肖1，张元植2

2020年3期

摘要

引用本文

摘要：针对搜集的38根设肋试件的轴压试验结果，采用ABAQUS进行了有限元计算。计算结果表明，轴压承载力与试验轴压承载力误差在7%以内，破坏模式与试验破坏模式吻合较好。根据相关试验数据，对加劲肋的工作机理及受力状态进行了分析。分析结果表明，平板加劲肋截面抗弯刚度对试件承载力有明显的影响，应选取合适加劲肋抗弯刚度及截面尺寸，才能既使组合构件的承载性能得到有效发挥，同时用钢量得到合理优化；钢管屈曲模式受加劲肋刚度的影响较大，随着加劲肋刚度的增大，钢管板件逐渐由在板件横向的一个半波转变为两个半波；当加劲肋刚度达到临界刚度后，加劲肋截面面积不再影响钢管屈曲模式，但试件的轴压承载力随加劲肋面积的增大而增大。 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,张元植.设纵向加劲肋后矩形钢管混凝土柱屈曲机制分析及构造建议[J].混凝土与水泥制品,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> /石墨复合相变蓄热混凝土制备及性能研究

定形PEG/SiO₂ /石墨复合相变蓄热混凝土制备及性能研究

王永伟1，李文丽2

2020年3期

摘要

引用本文

摘要: 为制备性能优异的相变蓄热混凝土，试验确定了定形PEG/SiO₂ /石墨复合相变蓄热骨料中相变材料的组成比例和制备工艺，并研究了相变蓄热骨料对混凝土力学性能和热工性能的影响。结果表明，相变材料中PEG含量为80%，石墨掺量为6%时，相变材料在具有合适相变温度和相变焓的同时，有良好的导热性能；相变蓄热骨料的合适吸附时间和温度分别为3h和80 ℃，经表面封装后的相变蓄热骨料具有优异的稳定性。相变蓄热骨料虽然降低了混凝土的抗压强度和导热系数，但延缓了水泥水化热造成的温度升高，延缓了放热速率，能防止温度应力造成的混凝土开裂，且能明显改善混凝土的储热性能，综合考虑相变蓄热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 %.

王永伟,李文丽.定形PEG/SiO₂/石墨复合相变蓄热混凝土制备及性能研究[J].混凝土与水泥制品,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.

双掺矿物掺合料轻骨料混凝土性能试验研究

侯景鹏，刘俊龙，史巍，张腾

2020年3期

摘要

引用本文

摘要：试验研究了粉煤灰、矿渣粉复合掺合料对LC30页岩陶粒轻骨料混凝土坍落度、抗压强度、抗冻融性能、抗碳化性能和自由收缩性能的影响规律。结果表明：总掺量不变时随着粉煤灰相对掺量的增加，坍落度逐渐增加；矿物掺合料提高了混凝土后期抗压强度，总掺量为30%、粉煤灰矿渣粉掺入比例2∶3时28d抗压强度高于基准试验组14.3%；总掺量一定时掺入比例为2∶3的试验组，混凝土抗冻性能、抗碳化性能和抗自由收缩性能最佳；掺入比例一定时，掺量为30%的试验组的力学性能和耐久性能更优。 Abstract: Theeffectsofflyashandslagpowdercompoundadmixturesontheslump,compressivestrength,freeze-thawresistance,carbonationresistanceandfreeshrinkageperformanceofLC30shaleceramsiteconcretewerestudied.Theresultsshowthatwiththeincreaseofrelativeamountofflyash,theslumpsincreasegradually.Mineraladmixturescanincreasethelong-timeconcretestrength.Whentheamountofadmixturesis30%andtheflyash-slagpowderratiois2∶3,thecompressivestrengthat28dayis14.3%higherthanthatofthereferencegroup.Thetestgroupswiththeflyash-slagpowderratioof2∶3foracertainamountoftotaladmixtureshavethebestanti-freeze,carbonationandfreeshrinkageproperties.Theconcretegroupswith30%mineraladmixtureshavebettermechanicalanddurabilityproperties.

侯景鹏,刘俊龙,史巍,等.双掺矿物掺合料轻骨料混凝土性能试验研究[J].混凝土与水泥制品,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.

耐碱玻璃纤维编织网混凝土梁抗弯性能研究

凌苛苛，曹宝珠，董金爽，宋文涛

2020年3期

摘要

引用本文

摘要: 提出了采用耐碱GFRP编织网替代传统钢筋在混凝土梁中作为受力骨架的新型结构形式。为研究该类型结构的力学性能，设计了3根试件，对其进行三分点加载，观察其受力全过程及破坏特征，分析其破坏模式。在试验研究的基础上，采用ABAQUS有限元软件进行了混凝土强度参数对其力学性能影响的参数分析。试验及数值模拟结果表明：配筋率对耐碱GFRP混凝土梁的受弯性能影响较大；随着混凝土强度的提升，梁的承载力虽有所提升，但挠度降低。
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,曹宝珠,董金爽,等.耐碱玻璃纤维编织网混凝土梁抗弯性能研究[J].混凝土与水泥制品,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.

多层石墨烯/钢纤维砂浆的制备及力学性能研究

韩瑞杰1,2；程忠庆2，高屹2，薛子刚2,3

2020年3期

摘要

引用本文

摘要：研究了不同掺入工艺下多层石墨烯和钢纤维在水泥基中的分散效果，并对单掺、复掺两种填料下砂浆的抗压、抗折强度和压折比进行了试验研究。结果表明：采用干拌法分散钢纤维和高速离心法分散多层石墨烯的工艺更佳；钢纤维和多层石墨烯的协同作用提高了高掺量多层石墨烯砂浆的抗压和抗折强度，其中复掺钢纤维和多层石墨烯砂浆的28d抗压强度比单掺多层石墨烯提高32.82%～43.96%，抗折强度提高18.33%～31.08%，且提高程度随着钢纤维掺量的增加而上升。 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.

韩瑞杰,程忠庆,高屹,等.多层石墨烯/钢纤维砂浆的制备及力学性能研究[J].混凝土与水泥制品,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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