仿竹设计在高耸薄壁脱硫塔结构中的应用

Application of imitation bamboo design in high-rise thin-walled desulfurization tower structures

为提高钢制脱硫塔结构的稳定性,从结构特征与受力性能关系角度阐明了竹子结构抗倒塌机制,并将其应用于钢制脱硫塔结构的仿竹设计,通过缩尺模型振动台试验,考察了仿竹型脱硫塔的抗震性能.根据刚度渐变的原则,提出脱硫塔截面的分段变壁厚设计方法,使仿竹型脱硫塔与竹身截面刚度变化趋势一致;通过特征值屈曲分析方法对加劲肋的设置进行了探讨,加劲肋可明显改善结构屈曲模态,加劲肋间距以4 m作为基数较为合理.试验表明,仿竹型脱硫塔在7、8度地震作用下塔体的最大位移及应力均未超过规范最大允许值,结构处于弹性状态,未发生破坏;在9度地震作用下,塔体的最大应力超过工作温度下材料许用应力,同时塔体产生局部轻度弯曲,但仍未倒塌.

To improve the stability of steel desulfurization tower,the anti-collapse mechanism of bamboo structure was clarified considering the relationship between structural characteristics and mechanical behavior,and it was applied to the imitation bamboo design of steel desulfurization tower structures.The seismic performance of bamboo-like desulfurization tower was analyzed by scale model shaking table tests.Based on the principle of stiffness gradual change,a design method of sectional variable wall thickness for desulfurization tower was proposed to ensure that the changing trend of section stiffness of bamboo-like desulfurization tower was consistent with that of the bamboo body.Stiffener setting was discussed through the eigenvalue buckling method.Stiffener could improve the buckling mode of the structure distinctly,and it is reasonable to set the stiffener spacing of 4 m as the base number.Test results show that the maximum displacement and stress of the structure did not exceed the allowable value under the action of 7 or 8-degree earthquake.The structure was in an elastic state without damage.Under the action of 9-degree earthquake,the maximum stress of the tower exceeded the material allowable stress at working temperature,and local mild bending occurred on the tower,but the structure still did not collapse.