發(fā)布時間：2018-03-20 05:12

  本文選題：混凝土柱　切入點：溫度效應　出處：《山東農業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：混凝土的塑性好、后期強度高、造價低廉,廣泛應用于工民用建筑、防護工程等。鋼筋混凝土結構雖然不可燃,但在高溫中會發(fā)生一系列物理和化學變化,其性能降低而影響工程結構的安全。礦產資源開采中的巷道,核廢料存儲所需要的鋼筋混凝土結構等一系列構筑物都不可避免地會受到溫度的影響。因此研究溫度對加筋混凝土建筑的影響具有非常重要的意義。本文使用山東農業(yè)大學水利土木工程實驗中心配置的上海樹立儀器儀表有限公司研制的FX101-3型電熱鼓風干燥箱,按照實驗設計對素混凝土和加筋混凝土試件進行加熱烘烤處理。使用長春科新試驗儀器有限公司研制的SAW-2000型微機控制電液伺服巖石三軸試驗機,對經過烘烤之后的素混凝土和加筋混凝土試件進行單軸壓縮,得出每個實驗試件的應力應變曲線。通過對應力-應變曲線的分析得出每個小組試件的彈性模量、峰值強度、峰值應變、殘余強度等力學指標。本文以素混凝土和加筋混凝土柱為研究對象,分別進行固定烘烤時間、變化溫度和固定溫度、變化烘烤時間的單軸壓縮實驗。在相同烘烤時間下,溫度越高,素混凝土柱和加筋混凝土柱的彈性模量越小,在200℃之前下降幅度較大;峰值強度逐漸降低,峰值應變逐漸增大;素混凝土柱的殘余強度逐漸減小,加筋混凝土柱的殘余強度逐漸增大,兩者的殘余強度在200℃之后趨于水平。在相同的烘烤溫度下,烘烤時間越長,素混凝土柱和加筋混凝土柱的峰值強度先升高再降低,在第10天左右達到最大值;殘余強度逐漸減小,20天之后趨于水平;素混凝土柱的彈性模量逐漸減小;加筋混凝土柱的彈性模量先增大后減小,在第25天達到最大值;素混凝土柱的峰值應變逐漸增大,加筋混凝土柱的峰值應變先減小后增大,在第20-25天達到最小值。
[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，

本文編號：1637658