加筋混凝土力学性能的温度效应分析

发布时间：2018-03-20 05:12

  本文选题：混凝土柱　切入点：温度效应　出处：《山东农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：混凝土的塑性好、后期强度高、造价低廉,广泛应用于工民用建筑、防护工程等。钢筋混凝土结构虽然不可燃,但在高温中会发生一系列物理和化学变化,其性能降低而影响工程结构的安全。矿产资源开采中的巷道,核废料存储所需要的钢筋混凝土结构等一系列构筑物都不可避免地会受到温度的影响。因此研究温度对加筋混凝土建筑的影响具有非常重要的意义。本文使用山东农业大学水利土木工程实验中心配置的上海树立仪器仪表有限公司研制的FX101-3型电热鼓风干燥箱,按照实验设计对素混凝土和加筋混凝土试件进行加热烘烤处理。使用长春科新试验仪器有限公司研制的SAW-2000型微机控制电液伺服岩石三轴试验机,对经过烘烤之后的素混凝土和加筋混凝土试件进行单轴压缩,得出每个实验试件的应力应变曲线。通过对应力-应变曲线的分析得出每个小组试件的弹性模量、峰值强度、峰值应变、残余强度等力学指标。本文以素混凝土和加筋混凝土柱为研究对象,分别进行固定烘烤时间、变化温度和固定温度、变化烘烤时间的单轴压缩实验。在相同烘烤时间下,温度越高,素混凝土柱和加筋混凝土柱的弹性模量越小,在200℃之前下降幅度较大;峰值强度逐渐降低,峰值应变逐渐增大;素混凝土柱的残余强度逐渐减小,加筋混凝土柱的残余强度逐渐增大,两者的残余强度在200℃之后趋于水平。在相同的烘烤温度下,烘烤时间越长,素混凝土柱和加筋混凝土柱的峰值强度先升高再降低,在第10天左右达到最大值;残余强度逐渐减小,20天之后趋于水平;素混凝土柱的弹性模量逐渐减小;加筋混凝土柱的弹性模量先增大后减小,在第25天达到最大值;素混凝土柱的峰值应变逐渐增大,加筋混凝土柱的峰值应变先减小后增大,在第20-25天达到最小值。
[Abstract]:Concrete has good plasticity, high later strength and low cost. It is widely used in industrial and civil buildings, protection works, etc. Although reinforced concrete structures are not flammable, a series of physical and chemical changes will take place at high temperatures. Its poor performance affects the safety of engineering structures. Roadways in Mining of Mineral Resources, A series of structures such as reinforced concrete structures needed for nuclear waste storage are inevitably affected by temperature. Therefore, it is very important to study the influence of temperature on reinforced concrete buildings. The FX101-3 type electrothermal blast dryer developed by Shanghai set up instrument and instrument Co., Ltd., which is configured by the Water Conservancy Civil Engineering Experimental Center of East Agricultural University, According to the experimental design, the specimens of plain concrete and reinforced concrete were heated and baked. The SAW-2000 microcomputer controlled electro-hydraulic servo triaxial testing machine for rock was developed by Changchun Ke New Test instrument Co., Ltd. The stress-strain curves of each specimen were obtained by uniaxial compression of roasted plain concrete and reinforced concrete. The elastic modulus and peak strength of each group specimen were obtained by analyzing the stress-strain curve. Peak strain, residual strength and other mechanical indexes. In this paper, the fixed baking time, change temperature and fixed temperature of plain concrete and reinforced concrete columns are studied, respectively. Uniaxial compression experiment of varying baking time. At the same baking time, the higher the temperature, the smaller the elastic modulus of plain concrete column and reinforced concrete column, and the larger the decrease of elastic modulus is before 200 鈩，

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