输电塔中钢管混凝土构件在侧向撞击后的剩余承载力研究  

Study on Residual Bearing Capacity of Concrete-Filled Steel Tubular Members in Transmission Towers after Lateral Impact

作　　者：田雪梅[1] 朱翔[2] TIAN Xue-mei;ZHU Xiang(Shanxi Technology and Business College,Taiyuan 030000,China;School of Electric Power,Civil Engineering and Architecture,Shanxi University,Taiyuan 030031,China)

机构地区：[1]山西工商学院,太原030000 [2]山西大学电力与建筑学院,太原030031

出　　处：《电力学报》2022年第5期374-383,共10页Journal of Electric Power

基　　金：国家自然科学基金(11802166);山西省科技厅应用基础研究计划项目(202103021223022);山西省教育厅高校科技创新项目(2020L0052)。

摘　　要：为研究侧向撞击作用后输电塔中钢管混凝土构件剩余承载力,基于非线性有限元软件ABAQUS建立了侧向撞击后钢管混凝土构件的轴压数值模型。对经典轴压作用下钢管混凝土构件侧向撞击试验进行了验证,分析表明数值模拟结果与试验结果吻合较好。基于此模型,进行了准静态下受压模型的验证分析,结果显示准静态计算结果与隐式计算结果基本相同。因此,采用在ABAQUS/Explict准静态下完成输电塔中钢管混凝土构件撞击后的受压计算,研究其在侧向撞击作用下的破坏形态和动力响应,对其受损后残余轴向承载力进行了分析,并探讨了不同参数对钢管混凝土构件损伤度的影响,探讨的参数包括撞击质量、撞击速度、钢管壁厚、长细比和钢材强度等,研究了哪些参数对钢管混凝土构件在撞击后损伤影响最大。对工程中尤其输电塔结构中采用钢管混凝土构件时给出合理的设计建议。通过多变量回归分析,根据不同参数拟合出各参数与受损构件剩余承载力之间的经验公式。结果表明:钢管混凝土构件底部受到撞击后主要发生局部和整体两种变形,局部变形主要发生在撞击点附近,整体变形主要发生在底端支座处;钢管壁厚增大或钢材强度较高时,试件损伤度会明显降低;长细比在一定范围内对试件的损伤度几乎没有影响。在工程常用范围内,基于参数分析结果,拟合得到损伤度(D)'的实用计算公式,并与损伤度定义公式计算结果作了对比。对比发现拟合公式与计算公式吻合良好,拟合公式计算结果的大部分误差在15%以内,故拟合的经验公式可对快速计算钢管混凝土遭受撞击后的剩余承载力提供一定参考。To study residual bearing capacity of concrete-filled steel tubular members in transmission towers,numerical model of CFST members under axial compression after lateral impact is established based on the nonlinear finite element software ABAQUS;The classical lateral impact test of CFST members under axial compression is verified.The analysis shows that the numerical simulation results are in good agreement with the experimental results.Based on this model,the verification analysis of the quasi-static compression model is carried out,and the results show that the quasi-static calculation results are basically the same as the implicit calculation results.Therefore,the compression calculation of the concrete-filled steel tubular member in the transmission tower after the impact is completed under the quasi-static ABAQUS/Explict,and the failure mode and dynamic response under lateral impact are studied.And the residual axial bearing capacity of members is analyzed after damaged.The parameters discussed include impact mass,impact velocity,steel tube wall thickness,slenderness ratio and steel strength,which parameters have the greatest impact on the damage of CFST components after impact.Reasonable design suggestions are given for the use of concrete-filled steel tubular members in the project,especially in the structure of the transmission tower.According to different parameters,empirical equation between each parameter and the residual bearing capacity of the damaged component is fitted through multivariate regressive analysis.The results show that local deformation and overall deformation occur at the bottom of CFST members after impact,and the former mainly occurs near the impact point while the later at the bottom of support;With the increase of steel tube wall thickness or high steel strength,the damage degree of the specimen decreases gradually;The slenderness ratio has little influence on the damage degree of the specimen within a certain range.Within the common scope of engineering,based on the results of para

关 键 词：输电塔 钢管混凝土 侧向撞击 破坏形态 剩余承载力 

分 类 号：TU398[建筑科学—结构工程]