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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

冲击荷载作用下钢筋混凝土梁力学特性
冲击荷载作用下钢筋混凝土梁力学特性
  • 葛文慧
2020年1期   No.285   P73-77+91
摘要
引用本文
摘要:为研究RC梁在冲击荷载作用下的力学特性,以混凝土强度、纵筋与箍筋配筋率、冲击体的冲击速度以及RC梁的跨度为主要参数对RC梁在冲击作用下的力学性能进行了数值分析,通过与已有试验结果对数值模型进行标定,获取了冲击力时程曲线、位移时程曲线以及破坏形态,验证了数值结果的正确性。分析结果表明,混凝土强度主要影响RC梁的破坏形态;纵筋配筋率对RC梁跨中位移影响较大;冲击体速度会同时对RC梁的破坏区域和跨中位移产生影响;RC梁跨度不仅会改变梁跨中位移也会改变梁的振动频率与反弹速度。
Abstract: In order to study the mechanical properties of RC beams subjected to impact loads, the mechanical properties of RC beams subjected to impact loads were numerically analyzed by taking concrete strength, ratio of longitudinal reinforcement to stirrup reinforcement, impact velocity of impact body and span of RC beams as main parameters. The numerical models were calibrated with the existing experimental results, and the impact force time history curve, displacement time history curve and breakage were obtained, and the correctness of the numerical results was verified. The results show that the concrete strength mainly affects the failure mode of RC beams. The reinforcement ratio of longitudinal bars has a great influence on the mid-span displacement of RC beams. The impact velocity also affect the damage area and mid-span displacement of RC beams. The span of RC beams can not only change the mid-span displacement of beams, but also change the vibration frequency and rebound speed of beams.
葛文慧.冲击荷载作用下钢筋混凝土梁力学特性数值研究[J].混凝土与水泥制品,2020(1):73-77+91.
GE W H.Numerical Study on Mechanical Properties of Reinforced Concrete Beams under Impact Loads[J].China Concrete and Cement Products,2020(1):73-77+91.
铝酸盐水泥基砂浆抗分散性研究
铝酸盐水泥基砂浆抗分散性研究
  • 高礼雄,崔 皓
2020年1期   No.285   P69-72
摘要
引用本文
摘要:选用m(铝酸盐水泥)∶m(普通硅酸盐水泥)∶m(水石膏)= 85%∶4%∶11%的三元胶凝体系,通过控制凝结时间制备出了自流平水下抗分散铝酸盐水泥基砂浆。通过测试其水陆强度、pH值、浊度并结合SEM微观分析,探究了铝酸盐水泥基砂浆抗分散性。结果表明,通过酒石酸和葡萄糖酸钠双掺解决了铝酸盐水泥基砂浆流动度损失大的问题。再生乳胶掺量增加优化了砂浆的抗分散能力。通过模拟水下现场浇筑,发现水下成型的铝酸盐水泥基砂浆试件的28 d抗压强度均在70 MPa以上,形成了控制凝结时间的水下成型制备技术。SEM揭示控制凝结时间的浇筑技术,水下成型的铝酸盐水泥砂浆试件内部密实、孔隙率低。
Abstract: A ternary cementing system of m(aluminate cement)∶m(ordinary portland cement)∶m(water gypsum) = 85%∶4%∶11% was used to control the setting time to produce a self-leveling water dispersion resistant aluminate cement-based mortar. The anti-dispersibility of aluminate cement-based mortar was explored by testing its water and land strength, pH value, turbidity and SEM microanalysis. The results show that the problem of large fluidity loss of aluminate cement-based mortar is solved by double mixing of tartaric acid and sodium gluconate. Increasing the amount of recycled latex optimizes anti-dispersion ability of the mortar. By simulating underwater in-situ pouring, the aluminate cement-based mortar specimens molded under water at 28 days has a compressive strength of more than 70 MPa, forming an underwater molding preparation technology to control the setting time. SEM reveals the pouring technology that controls the setting time, and the aluminate cement mortar specimens formed underwater are compact and have low porosity.
高礼雄,崔皓.铝酸盐水泥基砂浆抗分散性研究[J].混凝土与水泥制品,2020(1):69-72.
GAO L X,CUI H.Study on Anti-dispersion of Aluminate Cement Based Mortar[J].China Concrete and Cement Products,2020(1):69-72.
装配式建筑预制轻质保温墙体系统设计与性能研究
装配式建筑预制轻质保温墙体系统设计与性能研究
  • 於林锋,管 文,樊俊江
2020年1期   No.285   P65-68+72
摘要
引用本文
摘要:以轻骨料混凝土技术为基础,开展装配式建筑预制轻质保温墙体系统设计,并对保温墙体系统性能进行了综合测试分析。研究结果表明:与相同强度等级的普通混凝土相比,轻骨料混凝土保温墙体的防水性能不及普通混凝土,其与FRP拉接件的抗拉拔承载力和抗剪承载力分别降低了12%和13%,系统自重减轻了23%;设计了由轻骨料混凝土内叶墙板100 mm、XPS保温板40 mm、轻骨料混凝土外叶墙板55 mm和面砖饰面层组成的预制轻骨料混凝土夹心保温外挂墙板系统,可满足65%的建筑节能设计要求和防水要求。
Abstract: Based on the technology of lightweight aggregate concrete, the design of precast lightweight thermal insulation wall system for prefabricated buildings was carried out, and the performance of thermal insulation wall system was comprehensively tested and analyzed. The results show that the waterproofing performance of lightweight aggregate concrete insulation wall is inferior to that of ordinary concrete in the same strength grade. The pull-out and shear bearing capacity of lightweight aggregate concrete insulation wall and its FRP connectors are reduced by 12% and 13%, respectively, and the weight of the system can be reduced by 23%. The design of lightweight aggregate concrete inner-leaf wall board is 100 mm, XPS insulation board is 40 mm, and lightweight aggregate concrete outer-leaf wall board is 55 mm. The prefabricated lightweight aggregate concrete sandwich thermal insulation external wall panel system composed of face brick decoration layer can meet 65% of the building energy saving design requirements and waterproof requirements.
於林锋,管文,樊俊江.装配式建筑预制轻质保温墙体系统设计与性能研究[J].混凝土与水泥制品,2020(1):65-68+72.
YU L F,GUAN W,FAN J J.Design and Research on Precast Lightweight Insulation Wall System of Prefabricated Buildings[J].China Concrete and Cement Products,2020(1):65-68+72.
装配式混凝土框架柱连接节点研究进展
装配式混凝土框架柱连接节点研究进展
  • 姚 兵1,朱张峰1,刘德源1,2,杜 咏1
2020年1期   No.285   P59-64
摘要
引用本文
摘要:装配式混凝土结构由于质量可靠、生产效率高、抗震性能好,近年来在国内得到快速发展。框架柱作为框架结构的重要受力构件,预制柱之间的连接节点则更是其关键部位,节点连接的受力可靠性将决定整体结构的抗震能力,节点连接的构造合理性将影响施工效率与质量。结合近年来国内外装配式混凝土框架柱连接节点领域的发展概况,从试验研究与数值模拟两方面进行总结,并分析了仍然存在的问题及未来发展方向,为我国装配式混凝土框架结构的发展提供参考。
Abstract: The prefabricated concrete structure developed rapidly in China in recent years due to its reliable quality, high production efficiency and good seismic performance. As the important force-bearing member of the frame structure, the frame column is the key part of the prefabricated column. The reliability of the joint connection will determine the seismic capacity of the whole structure. The structural rationality of the joint connection can affect the construction efficiency and quality. Combining with the development situation of fabricated concrete frame column connection joints at home and abroad in recent years, the experimental research and numerical simulation are summarized, and the existing problems and future development direction are analysed, which can provide a reference for the development of fabricated concrete frame structures in China.
尤志国,王璐,刘佳星.多尺寸纤维透水混凝土性能试验研究[J].混凝土与水泥制品,2020(1):55-58.
YOU Z G,WANG L,LIU J X.Experimental Study on the Performance of Multi Size Fiber Permeable Concrete [J].China Concrete and Cement Products,2020(1):55-58.
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