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混凝土裂缝开展宽度计算的有限单元法 总被引:6,自引:0,他引:6
本文采用“最大拉应力单元开裂”准则,改进了非线性分析的迭代流程,使其最大可能地模拟实际结构的开裂情况,进而可以基于分布裂缝模式计算裂缝发生位置,裂缝间距,裂缝开展深度和宽度。算例表明,该法所计算的裂缝分布规律是正确的,计算裂缝宽度与试验实测值及规范公式计算值基本吻合,可以推广应用。 相似文献
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氧化镁在不同养护条件下水化产物的形貌分析 总被引:1,自引:0,他引:1
The morphologies of brucite formed from MgO hydration under different curing conditions were studied. The results showed that there were relations between the morphologies of brucite and its forming conditions. The size of brucite crystals increased with the curing time, and they were fiber-shaped at lower curing temperature and stick-shaped at higher temperature. When MgO was cured in paste with 10 percent cement, the crystal of brucite was fiber-shaped, while cured in paste with 95 percent cement, the crystal was hexaflaggy-shaped, which aggregated and produced some micro-cracks in paste when the curing temperature was increased. At 180 ℃ autoclaving temperature of MgO, the brucite was regular hexaflaggy-shaped crystal; for 216 ℃, it was less irregular. When the paste mixed with 50 percent fly ash, the crystal of brucite was needle-shaped and distributed more evenly, so decreased the deformation and crack of the concrete. 相似文献
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