共查询到20条相似文献,搜索用时 125 毫秒
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李朋轩李珠刘元珍王利东 《混凝土》2016,(10):11-15
玻化微珠保温混凝土是无机保温材料的代表,兼具保温与承重性能。根据玻化微珠保温混凝土在不同温度下的热工性能参数,运用ANSYS有限元分析软件对玻化微珠保温混凝土剪力墙和普通混凝土剪力墙在单面受火情况下进行了瞬态热分析,得出不同火灾时间下墙截面和钢筋网架温度场分布。通过对比分析,保温混凝土在火灾下具有良好的抗火性能,对其内部的钢筋网架有了更好的保护,为进一步研究玻化微珠保温混凝土剪力墙在火灾下的力学性能和抗火设计奠定了基础。 相似文献
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本文就高强混凝土早期开裂问题的国内外研究概况、目前的研究水平和发展趋势进行总结,并对高强混凝土早期开裂的评价手段和研究方向提出了展望。 相似文献
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对高温下HSC/HPC的爆裂机理以及相关抑制措施对HSC/HPC抗爆裂性能和高温后剩余性能的影响进行了研究综述,并简要介绍了由爆裂引起的HSC混凝土构件耐火极限计算方法,指出了其中存在的某些有待完善的问题,并展望了今后的研究发展趋势,以期指导实践。 相似文献
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Min Li Hongtao Kao Chunxiang Qian 《Frontiers of Architecture and Civil Engineering in China》2008,2(3):281-287
To evaluate the remaining durability of concrete materials after combustion, the permeability of high strength concrete (HSC)
after combustion was studied. The transport behavior of chloride ion, water and air in concrete after combustion and the effect
of temperature, strength grade, and aggregation on the permeability of HSC after combustion are investigated by chloride ion
permeability coefficient (D
c), water permeability coefficient (D
w) and air permeability coefficient (D
a). The experiment results show that all three permeability coefficients commendably reflect changes of permeability. The permeability
coefficient increases with the evaluation temperature. After the same temperature, the permeability coefficient of HSC is
lower than that of normal strength concrete (NSC). However, the degree of degradation of permeability coefficient of HSC is
greater than that of NSC. The permeability resistance of HSC containing limestone is better than that of HSC containing basalt.
Combining changes of compressive strength and permeability, the remaining durability of concrete materials after combustion
is appropriately evaluated.
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Translated from Journal of Southeast University (Natural Science Edition), 2006, 36(5): 825–830 [译自: 东南大学学报(自然科学版)] 相似文献
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高效减水剂 ,作为高性能混凝土的第 5种组分 ,已经在土木工程上得到应用 .根据高强混凝土的性能 ,对高效减水剂提出了相应的技术要求 ,并对其常用种类、结构以及作用机理进行了探讨 相似文献
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在研究高强混凝土高温后性能的基础上,通过对火灾后影响高强混凝土结构性能的主要因素进行了分析,选择抗压强度损失系数、耐久性损失系数、爆裂损失系数和裂纹损失系数作为评价指标,以投影寻踪回归理论为基础,提出综合评定高温后损伤混凝土性能的方法,建立了投影寻踪综合评价模型,编制了基于MATLAB的相应程序,采用加速遗传算法,寻求最优投影方向,根据投影特征指标值,对高强混凝土高温后性能进行综合评价.研究表明,该方法避免了评判专家人为确定权重,评价结果客观准确、方法简单,为混凝土结构火灾损伤的诊断评估与修复加固提供了科学依据. 相似文献
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高性能混凝土产业化发展的若干思考 总被引:2,自引:0,他引:2
本文通过对高强高性能混凝土的研究应用回顾,提出了普通混凝土高性能化是今后我国高性能混凝土产业化发展的主导方向,也是解决当前泵送混凝土普遍存在的早期开裂趋势明显的主要技术途径。对制约高性能混凝土产业化发展的水泥品质、现行规范和施工养护工艺等因素作了深入阐述。 相似文献
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Fire Endurance of High Strength Concrete Columns 总被引:5,自引:0,他引:5
In buildings, fire represents one of the most severe environmental conditions, and therefore, should be properly accounted for in the design of high strength concrete (HSC) structural members. The increased use of HSC in buildings has raised concerns regarding the behavior of such concrete in fire. In particular, spalling at elevated temperatures, as identified in studies by a number of laboratories, is a main concern.In this paper, results from an experimental program on the fire resistance of HSC columns are presented. The factors that influence the thermal and structural behavior of HSC concrete columns under fire conditions are discussed. Data from this study indicate that the type of aggregate, concrete strength, load intensity, and detailing and spacing of ties have an influence on the fire resistance performance of HSC columns. Further, the test results show that tie configuration (bending of ties at 135°, ties and provision of cross ties) and closer tie spacing has a significantly beneficial effect on the fire resistance of HSC columns. The results presented will generate data on the fire resistance of HSC columns, and contribute to identifying the factors that influence the behavior of HSC columns. 相似文献