【摘要】：玄武巖增強(qiáng)纖維復(fù)合材料(BFRP)作為國家重點(diǎn)發(fā)展的三大高新增強(qiáng)纖維復(fù)合材料,具有輕質(zhì)高強(qiáng)、耐腐蝕和非磁性等優(yōu)點(diǎn),具有逐步代替建筑結(jié)構(gòu)的內(nèi)部鋼筋形成BFRP筋增強(qiáng)體系的巨大潛力。本文在試驗(yàn)研究和理論推導(dǎo)的基礎(chǔ)上,對不同腐蝕環(huán)境作用下BFRP筋的疲勞性能進(jìn)行了研究,主要包括以下三方面內(nèi)容:對處于酸堿腐蝕環(huán)境及模擬火災(zāi)環(huán)境作用下的BFRP筋進(jìn)行了力學(xué)性能試驗(yàn)研究,分析觀察了筋材在不同腐蝕環(huán)境作用下的的外觀變化形態(tài)及破壞模式;獲得了彈性模量、極限應(yīng)變、抗壓強(qiáng)度、抗剪強(qiáng)度、抗拉強(qiáng)度等材料力學(xué)性能參數(shù)隨環(huán)境變化的變化規(guī)律,并繪制了BFRP筋室溫作用下的應(yīng)力應(yīng)變曲線。對單點(diǎn)-成組法進(jìn)行了改進(jìn),得到了BFRP筋在不同溫度作用下的S-N曲線,結(jié)合回歸分析方法構(gòu)造了對應(yīng)的實(shí)現(xiàn)算法;觀察了不同溫度作用下BFRP筋的外觀狀態(tài)和疲勞破壞模式;根據(jù)不同溫度作用下筋材的疲勞試驗(yàn)結(jié)果,分析了不同溫度對構(gòu)件疲勞壽命的影響,并建立了相應(yīng)的P-S-N曲線和γ-P-S-N曲線模型,揭示了不同可靠度條件下不同溫度對筋材疲勞壽命的影響規(guī)律。利用相關(guān)系數(shù)優(yōu)化法,對單點(diǎn)-似然法進(jìn)行了改進(jìn),得到了BFRP筋在不同腐蝕時(shí)間作用下的S-N曲線;結(jié)合回歸分析方法,構(gòu)造了與之對應(yīng)的實(shí)現(xiàn)算法;觀察了不同腐蝕時(shí)間作用下筋材的外觀狀態(tài)和疲勞破壞模式;根據(jù)不同腐蝕時(shí)間作用下筋材的疲勞試驗(yàn)結(jié)果,得到了疲勞壽命隨腐蝕時(shí)間變化的變化規(guī)律,并建立了BFRP筋相應(yīng)的P-S-N和γ-P-S-N曲線模型;建立了在不同腐蝕時(shí)間作用下BFRP筋的t-P-S-N曲面模型,對估算不同腐蝕時(shí)間作用后BFRP筋的疲勞壽命提供重要價(jià)值。
[Abstract]:Basalt reinforced fiber composite (BFRP), as the three high and new reinforced fiber composites developed by the state, has the advantages of light and high strength, corrosion resistance and non-magnetism, and has great potential to gradually replace the internal steel bar of building structure to form BFRP reinforcement system. On the basis of experimental study and theoretical derivation, the fatigue properties of BFRP tendons under different corrosion environments are studied in this paper, including the following three aspects: the mechanical properties of BFRP tendons in acid-base corrosion environment and simulated fire environment are studied, and the appearance change form and failure mode of BFRP tendons under different corrosion environments are analyzed and observed. The variation of mechanical properties of materials such as elastic modulus, ultimate strain, compressive strength, shear strength and tensile strength with the environment was obtained, and the stress-strain curves of BFRP tendons at room temperature were drawn. The single point group method is improved, the S 鈮，

本文編號(hào)：2506247