首页|钢筋混凝土柱压弯承载力与刚度实用计算方法

钢筋混凝土柱压弯承载力与刚度实用计算方法

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为研究框架柱的压弯承载力与压弯刚度,通过建立三维实体有限元模型,在与拟静力试验结果验证较好的基础上,进一步建立了 162根足尺钢筋混凝土柱有限元模型算例进行参数分析,探讨了各参数对柱的承载力、刚度的影响,提出了参数影响下的柱承载力、刚度实用计算公式.结果表明:当轴压比≤0.4时,随轴压比的增大,柱的压弯峰值承载力增大,当轴压比＞0.4时,随轴压比的增大,柱的压弯峰值承载力减小,提高纵筋配筋率与混凝土强度等级均能有效的增大柱的压弯峰值承载力,且提高纵筋配筋率的效果更好;当轴压比≤0.2时,随轴压比的增大,柱的弹性刚度增大,当轴压比＞0.2时,随轴压比的增大,柱的弹性刚度减小,提高纵筋配筋率与混凝土强度等级均能增大柱的弹性刚度;提出的实用计算公式可较准确地反映有限元结果,可为实际工程中框架柱的设计作一定的参考.
Practical Calculation Method for Compression-bending Capacity and Stiffness of Reinforced Concrete Columns
In order to study the bending bearing capacity and stiffness of frame columns,a three-dimensional solid finite element model was established,which was verified well with the results of quasi-static tests,162 full-scale reinforced concrete columns were further established for parameter analysis.The influence of various parameters on the bearing capacity and stiffness of the column was discussed,and the practical calculation formula of the bearing capacity and stiffness of the column under the influence of parameters was proposed.The results show as follows.When the axial compression ratio is less than or equal to 0.4,the peak bearing capacity of the column will increase with the increase of the axial compression ratio.When the axial compression ratio is greater than 0.4,the peak bearing capacity of the column will decrease with the increase of the axial compression ratio;improving the longitudinal reinforcement ratio and the concrete strength grade can effectively increase the peak bearing capacity of the column,and the effect of improving the longitudinal reinforcement ratio is better.When the axial compression ratio is less than or equal to 0.2,the elastic stiffness of the column will increase with the increase of the axial compression ratio.When the axial compression ratio is greater than 0.2,the elastic stiffness of the column will decrease with the increase of the axial compression ratio.Increasing the longitudinal reinforcement ratio and the concrete strength grade will increase the elastic stiffness of the column.The practical calculation formula can accurately reflect the finite element results,and can be used as a reference for the design of frame columns in practical projects.

reinforced concrete columncompression-bending capacitybending stiffnesspractical calculation formulafinite element analysis

吕辉、肖冲、罗靓

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南昌航空大学土木建筑学院,南昌 330063

江西省装配式建筑与智能建造重点实验室,南昌 330063

南昌理工学院建筑工程学院,南昌 330044

钢筋混凝土柱 压弯承载力 压弯刚度 实用计算公式 有限元分析

国家自然科学基金南昌航空大学研究生创新专项南昌航空大学博士启动基金江西省智慧建筑工程研究中心开放基金

52268031YC2021-114EA201911291HK20231011

2024

10.12404/j.issn.1671-1815.2301366

科学技术与工程
中国技术经济学会

科学技术与工程

CSTPCD北大核心
影响因子：0.338
ISSN：1671-1815
年,卷(期)：2024.24(10)
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