钢筋混凝土箱形柱塑性铰长度有限元分析
发布时间：2019-07-06 10:17
【摘要】：塑性铰理论是结构非线性分析的基础理论,钢筋混凝土结构在塑性铰产生后,其变形内力会受到显著的影响。基于此,国内外许多学者对塑性铰的性质开展了大量的研究工作,并得出了一些钢筋混凝土结构塑性铰长度的计算方法。但是目前关于塑性铰长度的研究基本都是基于实心截面的,而关于箱形截面的研究还不是很多。钢筋混凝土箱形结构因其优越的空间受力性能在高墩结构中有广泛的应用前景,因此对影响钢筋混凝土箱形结构塑性铰长度因素的研究是必要的。本文通过ABAQUS有限元软件分析研究了轴压比、截面尺寸、剪跨比、体积配箍率、纵筋配筋率等五个因素对塑性铰长度影响,以及轴压比、剪跨比、体积配箍率等因素对塑性铰区域抗剪强度的影响,具体结论如下:(1)当轴压比小于0.3时,钢筋混凝土箱形柱的塑性铰长度随着轴压比的增大而增大;当轴压比大于0.3时,塑性铰长度的变化趋势不明显;截面尺寸的变化对塑性铰长度影响较大,随着加载方向截面宽度和横桥向壁厚比的增大而减小,纵桥向壁厚比对塑性铰长度影响不明显;箱形柱的塑性铰长度随着体积配箍率的增加而增加;在较低的轴压水平下,纵筋配筋率的提高能够较为显著的提高箱形柱的塑性铰长度,若轴压较大时,纵筋率的变化对塑性铰长度的影响可以忽略。(2)有限元分析结果与Paulay建议公式、《欧洲建筑工程设计规范》、袁必果公式、我国《公路桥梁抗震设计细则》计算公式的计算结果较为接近,模拟结果与计算结果的比值均在0.8左右,可以采用这些公式计算钢筋混凝土箱形柱的塑性铰长度,并且具有一定的安全储备。根据有限元分析结果采用数据分析软件,总结出了适合本文中模型塑性铰长度计算的公式,并进行了验证。(3)箱形柱塑性铰区域的抗剪强度随着轴压比的增大而增大;随着剪跨比的增大,箱形柱的抗剪强度有较大幅度的下降;塑性铰区域的抗剪强度随着模型体积配箍率的提高而提高。
[Abstract]:The theory of plastic hinge is the basic theory of structural non-linear analysis. Based on this, many scholars at home and abroad have carried out a lot of research on the properties of plastic hinge, and the calculation method of the plastic hinge length of some reinforced concrete structures is obtained. However, the present study on the length of plastic hinge is based on solid section, and the study on box section is not much. The reinforced concrete box-like structure has a wide application prospect in the structure of the high-pier because of its superior space-bearing performance, so it is necessary to study the factors that influence the plastic hinge length of the reinforced concrete box-like structure. The influence of five factors such as axial compression ratio, cross section size, shear span ratio, volume ratio and reinforcement ratio of longitudinal bar on the length of plastic hinge, as well as the influence of axial compression ratio, shear span ratio, volume ratio and other factors on the shear strength of plastic hinge region are studied by means of ABAQUS finite element software. The concrete conclusions are as follows: (1) when the axial compression ratio is less than 0.3, the plastic hinge length of the reinforced concrete box-shaped column is increased with the increase of the axial compression ratio; when the axial compression ratio is greater than 0.3, the change trend of the plastic hinge length is not obvious; and the variation of the cross-sectional dimension greatly influences the length of the plastic hinge, with the increase of the cross-section width of the loading direction and the thickness ratio of the transverse bridge to the wall thickness, the influence of the longitudinal bridge to the wall thickness is not obvious to the length of the plastic hinge; the length of the plastic hinge of the box-shaped column is increased with the increase of the volume ratio; at the lower axial compression level, The improvement of the reinforcement ratio of the longitudinal bar can improve the plastic hinge length of the box-shaped column obviously, and if the axial compression is large, the influence of the variation of the longitudinal reinforcement ratio on the length of the plastic hinge can be neglected. (2) The results of the finite element analysis and the formula of Paay's recommendation, the Code for Design of the European Construction Engineering and the Yuan Biguo's formula, the calculation results of the formula for the anti-seismic design of the highway bridge in our country are close, and the ratio of the simulation results to the calculation results is about 0.8. These formulas can be used to calculate the plastic hinge length of the reinforced concrete box-shaped column and have a certain safety reserve. Based on the results of the finite element analysis, the formula for calculating the plastic hinge length of the model in this paper is summarized, and the verification is carried out. (3) The shear strength of the plastic hinge region of the box-shaped column is increased with the increase of the axial compression ratio; with the increase of the shear span ratio, the shear strength of the box-shaped column is greatly reduced; and the shear strength of the plastic hinge region is improved with the increase of the volume ratio of the model.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375
[Abstract]:The theory of plastic hinge is the basic theory of structural non-linear analysis. Based on this, many scholars at home and abroad have carried out a lot of research on the properties of plastic hinge, and the calculation method of the plastic hinge length of some reinforced concrete structures is obtained. However, the present study on the length of plastic hinge is based on solid section, and the study on box section is not much. The reinforced concrete box-like structure has a wide application prospect in the structure of the high-pier because of its superior space-bearing performance, so it is necessary to study the factors that influence the plastic hinge length of the reinforced concrete box-like structure. The influence of five factors such as axial compression ratio, cross section size, shear span ratio, volume ratio and reinforcement ratio of longitudinal bar on the length of plastic hinge, as well as the influence of axial compression ratio, shear span ratio, volume ratio and other factors on the shear strength of plastic hinge region are studied by means of ABAQUS finite element software. The concrete conclusions are as follows: (1) when the axial compression ratio is less than 0.3, the plastic hinge length of the reinforced concrete box-shaped column is increased with the increase of the axial compression ratio; when the axial compression ratio is greater than 0.3, the change trend of the plastic hinge length is not obvious; and the variation of the cross-sectional dimension greatly influences the length of the plastic hinge, with the increase of the cross-section width of the loading direction and the thickness ratio of the transverse bridge to the wall thickness, the influence of the longitudinal bridge to the wall thickness is not obvious to the length of the plastic hinge; the length of the plastic hinge of the box-shaped column is increased with the increase of the volume ratio; at the lower axial compression level, The improvement of the reinforcement ratio of the longitudinal bar can improve the plastic hinge length of the box-shaped column obviously, and if the axial compression is large, the influence of the variation of the longitudinal reinforcement ratio on the length of the plastic hinge can be neglected. (2) The results of the finite element analysis and the formula of Paay's recommendation, the Code for Design of the European Construction Engineering and the Yuan Biguo's formula, the calculation results of the formula for the anti-seismic design of the highway bridge in our country are close, and the ratio of the simulation results to the calculation results is about 0.8. These formulas can be used to calculate the plastic hinge length of the reinforced concrete box-shaped column and have a certain safety reserve. Based on the results of the finite element analysis, the formula for calculating the plastic hinge length of the model in this paper is summarized, and the verification is carried out. (3) The shear strength of the plastic hinge region of the box-shaped column is increased with the increase of the axial compression ratio; with the increase of the shear span ratio, the shear strength of the box-shaped column is greatly reduced; and the shear strength of the plastic hinge region is improved with the increase of the volume ratio of the model.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375
【参考文献】
相关期刊论文 前10条
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2 李贵乾;唐光武;郑罡;;圆形钢筋混凝土桥墩等效塑性铰长度[J];土木工程学报;2016年02期
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