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

钢管珊瑚混凝土柱-钢梁外加强环节点抗震性能有限元分析

何国瑞1,2，郑云2，吴迈1

2020年第8期

摘要

引用本文

摘要：通过ABAQUS有限元分析软件对钢管珊瑚混凝土柱-钢梁外加强环节点模型进行了非线性分析，以珊瑚混凝土强度和轴压比为参数，分析了此类节点的破坏特征、梁端荷载-位移曲线、骨架曲线、刚度退化以及耗能性能。结果表明，不同珊瑚混凝土强度的节点刚度退化趋势相同，随着珊瑚混凝土强度的提高，节点的承载力和累计耗能均逐渐增大，但效果不明显。轴压比越大，累计耗能越小，轴压比在0.2~0.4时，随着轴压比的增加，承载力下降不明显，轴压比大于0.4时，随着轴压比的增加，节点承载力下降迅速。不同参数下的钢管珊瑚混凝土柱-钢梁外加强环节点的滞回曲线均较为饱满，具有很好的抗震性能和耗能能力，有广泛的应用前景。 Abstract: Nonlinear analysis of coral concrete-filled steel tube column-steel beam joints with outer stiffening rings were carried out through ABAQUS finite element analysis software, considering the effect on the strength of coral concrete and axial compression ratio, failure characteristics, load-displacement curve at the end of beam, skeleton curves, stiffness degradation and energy dissipation performance were studied. The results show that the stiffness degradation trend of different coral concrete strength is the same, with the increase of coral concrete strength, the bearing capacity and cumulative energy consumption of the joints increase gradually, but the effect is not obvious. The larger the axial pressure ratio, the smaller the cumulative energy consumption, when the axial pressure ratio is 0.2~0.4, the bearing capacity decreases slowly with the increase of the axial pressure ratio, when the axial pressure ratio is greater than 0.4, the bearing capacity of the joints decreases rapidly with the increase of the axial pressure ratio. The hysteresis curves of coral concrete-filled steel tube column-steel beam joints with outer stiffening rings under different parameters are full, which has good seismic performance, energy dissipation ability, and wide application prospect.

何国瑞,郑云,吴迈.钢管珊瑚混凝土柱-钢梁外加强环节点抗震性能有限元分析[J].混凝土与水泥制品,2020(8):75-80. HE G R,ZHENG Y,WU M.Finite Element Analysis of Seismic Performance of Coral Concrete-filled Steel Tube Column-steel Beam Joints with Outer Stiffening Rings[J].China Concrete and Cement Products,2020(8):75-80.

基于温度-流变关系负温水泥基灌浆料使用温度限值研究

陶成云1，董淑慧1,2，江守恒1，田汉新3, 朱卫中4

2020年第8期

摘要

引用本文

摘要：从流变学角度探讨了不同品种不同组分的外加剂和环境温度对负温水泥基灌浆料流变协同作用的影响规律。结果表明，不同外加剂条件下，负温水泥基灌浆料从+20~-10 ℃温度转变过程中，同一剪切速率下剪切应力下降，在+20~-5 ℃温度范围内，灌浆料初始流动度和30 min流动度均随着使用环境温度的降低而增大，当温度达到-10℃时，灌浆料流动度迅速降低，不能满足标准要求。此时，在浆体流变性符合Bingham流体模型的条件下，建议使用温度为-5 ℃。 Abstract: The influence of admixture and ambient temperature on the rheological synergy of sub-zero temperature cementitious grout was discussed from the perspective of rheology. The results show that under the same shear rate, when the temperature changes from +20~-10 ℃, the shear stress of sub-zero temperature cementitious grout with different admixture decreases. Under the temperature ranged from 20~-5 ℃, the initial fluidity and the fluidity at 30 min of grout increase with the decrease of the ambient temperature. When the temperature reaches -10 ℃, the fluidity of grout decreases rapidly and cannot meet the codes requirements. At this time, the rheology of slurry coincided with Bingham fluid model, and the recommended temperature is -5 ℃.

陶成云,董淑慧,江守恒,等.基于温度-流变关系负温水泥基灌浆料使用温度限值研究[J].混凝土与水泥制品,2020(8):71-74. TAO C Y,DONG S H,JIANG S H,Research on the Applied Temperature Limit of Sub-zero Temperature Cementitious Grout Based on Temperature-rheological Relationship[J].China Concrete and Cement Products,2020(8):71-74.

装配式混凝土框架节点抗震研究进展

卢义1，孟书灵2，张平2，王琴2

2020年第8期

摘要

引用本文

摘要：对不同连接方式的节点抗震性能数值模拟和试验研究现状进行了归纳，并分析了各种方式的优缺点及今后发展趋势。提出了在多学科交叉运用频繁的背景下，需进一步研究型钢混凝土节点，同时基于“减少震后损失”的设计理念，要注重耗能自复位框架节点的研发。最后指出基于装配式框架节点自身特点，发展高效精准的模拟技术是未来的重要发展趋势。 Abstract: The current state of numerical simulation and experimental research on seismic performance of joints with different connection methods is summarized, and the advantages and disadvantages of various methods and future development trends are analyzed. It is considered that in the context of frequent cross-disciplinary applications, further research on steel reinforced concrete nodes is needed. At the same time, based on the design concept of "reducing post-earthquake losses", it is proposed to pay attention to the research and development of energy-consuming self-centering frame nodes. Finally, it is pointed out that based on the characteristics of the assembled frame nodes, the development of efficient and accurate simulation technology is an important development trend in the future.

卢义,孟书灵,张平.装配式混凝土框架节点抗震研究进展[J].混凝土与水泥制品,2020(8):65-70. LU Y,MENG S L,ZHANG P.Research Progress on Seismic Performance of Prefabricated Concrete Frame Joints[J].China Concrete and Cement Products,2020(8):65-70.

倒置外露灌浆套筒装配式柱脚节点抗震性能研究

乔德浩1，倪韦斌1，王少杰1，庞加宝2，胡兆文2，黄兴淮3

2020年第8期

摘要

引用本文

摘要：通过自振特性测试和竖向荷载作用下的低周往复荷载试验，对比分析了倒置外露灌浆套筒装配式柱脚节点与传统现浇及现行装配式柱脚节点的整体性及抗震性能。结果表明，倒置外露灌浆套筒柱脚节点试件（NPC）的整体性与传统现浇试件（RC）基本相当，现行装配试件（TPC）测试所得的各阶自振频率基本均低于RC和NPC。三种柱脚节点在失效破坏时均出现了塑性铰，且两个装配式柱脚节点较现浇试件其塑性铰、柱身开裂高度均上移约1个灌浆套筒高度，宜适当延长箍筋加密区。三种柱脚节点的刚度退化规律相同，延性系数均在3.0以上，NPC的耗能能力显著优于RC和TPC。RC、TPC、NPC对应的开裂位移角分别为1/430、1/393、1/479，对应的极限位移角分别为1/24、1/22、1/22，均分别大于规范限值，满足抗震设防要求。 Abstract: Through test of natural vibration property and horizontal low cycle reciprocating load test under vertical load, the integrity and seismic behavior of the inverted exposed grouting sleeve prefabricated column foot joint and the traditional cast-in-place and current prefabricated column base joint were compared and analyzed. The results show that the integrity of the specimen of inverted exposed grouting sleeve column base joint (NPC) is the same as that of the traditional cast-in-place specimen (RC). The natural frequencies of current assembled specimen (TPC) are lower than those of RC and NPC. Plastic hinge appears in all three kinds of column foot joints when they failed, and the height of plastic hinge and column body crack of two prefabricated column foot joints moves up about one grouting sleeve height compared with RC, the densified area of stirrup should be extended properly. The stiffness degradation law of the specimens is the same, the ductility factors are all above 3.0, and the energy dissipation capacity of NPC is significantly better than that of RC and TPC. The corresponding crack displacement angles of RC, TPC and NPC are 1/430, 1/393 and 1/479 respectively, and the corresponding limiting displacement drift are 1/24, 1/22 and 1/22 respectively, which are greater than the code limits, meeting the seismic fortification requirements.

乔德浩,倪韦斌,王少杰,等.倒置外露灌浆套筒装配式柱脚节点抗震性能研究[J].混凝土与水泥制品,2020(8):59-64. QIAO D H,NI W B,WANG S J,et al.Seismic Behavior of Prefabricated Column Foot Joint with Inverted Exposed Grouting Sleeve[J].China Concrete and Cement Products,2020(8):59-64.

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