| 引用本文: | 查晓雄,汪凯超,陈德劲.冷却塔定向拆除时剩余支柱的轴力计算方法[J].哈尔滨工业大学学报,2024,56(2):10.DOI:10.11918/202211010 |
| ZHA Xiaoxiong,WANG Kaichao,CHEN Dejing.Axial force calculation method of retained columns in directional demolition of cooling tower[J].Journal of Harbin Institute of Technology,2024,56(2):10.DOI:10.11918/202211010 |
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| 摘要: |
| 为了使冷却塔的定向拆除更加安全可控,对冷却塔保留柱轴向力的计算方法展开研究。根据力的相似关系给出支柱轴向力与其Z向力之间的关系式,基于平截面假定推导保留柱Z向力的计算公式；利用有限元研究环梁和支柱的弹性模量、支柱高度、保留柱数量以及相邻柱柱顶所对应的圆心角5种参数对保留柱Z向力的影响；根据有限元的结果对保留柱Z向力的计算公式进行修正,并研究修正后公式的适用性。结果表明:爆破后的冷却塔在所有保留柱上并不满足平截面假定；在实际工程范围内,上述5种参数不影响保留柱Z向力的分布规律为Z向力沿着y轴方向上的分布形态始终“两端受压,中间受拉”,且保留柱中的最大压力始终出现在第n排保留柱上,最大拉力始终出现在第（n-4）排保留柱上；当爆破圆心角为200°~240°时,修正后计算值的相对误差在21%以内,且该公式在不同冷却塔上具有良好的适用性。保留柱轴向力的计算公式从力学角度为冷却塔的拆除提供了理论支撑,增加了拆除工作的安全性。 |
| 关键词: 自然通风冷却塔 钢筋混凝土结构 建筑拆除 爆破拆除 轴力 |
| DOI：10.11918/202211010 |
| 分类号:TU33 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(52178129)；深圳市科技计划项目(GJHZ20200731095601006) |
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| Axial force calculation method of retained columns in directional demolition of cooling tower |
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ZHA Xiaoxiong,WANG Kaichao,CHEN Dejing
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(School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen,Shenzhen 518055, Guangdong, China)
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| Abstract: |
| To make the directional demolition of the cooling tower safer and more controllable, the axial force calculation method of the retained columns of the cooling tower is proposed. Firstly, in the light of the similarity relationship of the force, the relationship between the axial and Z-direction force of the column was investigated. Based on the plane section assumption, the calculation formula of the Z-direction force of the retained columns was deduced. Then, the effects of 5 parameters, specifically the elastic modulus of the ring beam and the column, the height of the column, the number of retained columns and the central angle corresponding to the top of the adjacent column on the Z-direction force of the retained column were explored by FEM. The calculation formula of the Z-direction force of the retained column was modified according to the results of FEM, and the applicability of the modified formula was studied. The results show that the blasted cooling towers do not satisfy the assumption of plane section on all retained columns. In practical engineering, the above 5 parameters do not affect the distribution characteristics of the Z-direction force of the retained columns: the distribution of the Z-direction force along the y-axis direction is always ′compression at both ends and tension in the middle′, the maximum compression in the retained columns always appears on the n row, with the maximum tension always on the (n-4) row. When the blasting center angle is in 200°-240°, the relative error of the modified formula is within 21%, and the modified formula exhibits good applicability in different cooling towers. The calculation formulas of axial force of retained column provide theoretical supports for the demolition of cooling tower from the perspective of mechanics, improving the safety of directional demolition of cooling tower. |
| Key words: natural draft cooling tower reinforced concrete structure building demolition blasting demolition axial force |
