黄远?覮,胡晓芳,易伟建.预应力混凝土框架抗连续倒塌压拱承载力研究[J].湖南大学学报:自然科学版,2020,(7):61~67
预应力混凝土框架抗连续倒塌压拱承载力研究
Study on Load Bearing Capacity of Compressive Arch Action for Prestressed Concrete Frames under Column-Removal Scenarios
  
DOI:
中文关键词:  预应力混凝土框架  有黏结  精细有限元  连续倒塌  压拱机制  承载力
英文关键词:prestressed concrete  bonded  finite element analysis  collapse analysis  compressive arch mechanism  bearing capacity
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作者单位
黄远?覮,胡晓芳,易伟建 (湖南大学 土木工程学院湖南 长沙410082) 
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中文摘要:
      为了研究预应力混凝土框架抗连续倒塌的压拱机制承载力,首先建立了有黏结预应力框架非线性有限元分析模型,并采用试验数据对分析模型进行了验证,在此基础上研究了有黏结预应力框架与普通钢筋混凝土框架在连续倒塌过程中压拱受力机制的区别,并分析了预应力框架压拱机制承载力的影响因素. 研究表明:预应力的施加会增加压拱效应,减弱边柱的破坏,但会加剧中柱的破坏. 非预应力筋配筋率、梁高和跨度对压拱机制承载力Fa.u影响较大,顶部非预应力筋配筋率从0.66%增加到1.32%时,Fa.u增加了19.6%,底部非预应力筋配筋率从0.66%增加到1.32%时,Fa.u增加了31.5%;梁高从700 mm增加到900 mm时,Fa.u增大了220.7%,跨度从9 m增加到15 m时,Fa.u减小了64.0%. 柱截面尺寸较小时,增大柱截面尺寸对Fa.u的影响较大;但柱截面尺寸较大时,增大柱截面尺寸对Fa.u的影响较小. 预应力筋配筋率和初始张拉控制应力对Fa.u的影响较小.
英文摘要:
      In order to investigate the progressive collapse capacity of prestressed concrete frame structures, we established a nonlinear finite element model of a bonded-prestressed concrete frame. The experimental data were used to verify the model. On this basis, the differences of mechanical mechanism between bonded prestressed frame and reinforced concrete frame in the process of progressive collapse were studied, and the influencing factors of the first peak bearing capacity of prestressed frame were analyzed. The studies show that the application of prestress enhances the arch compression effect and weakens the failure of the side column, but it aggravates the failure of the middle column. The ratio of reinforcement, depth of beam and span have great influence on the bearing capacity of arch compression(Fa.u). When the top reinforcement ratio increased from 0.66% to 1.32%,Fa.u increased by 19.6%. When the bottom reinforcement ratio increased from 0.66% to 1.32%, Fa.u increased by 31.5%. When the depth of beam increased from 700 mm to 900 mm,Fa.u increaseds by 220.7%. When the span increased from 9 m to 15 m,Fa.u decreaseds by 64.0%. When the size of column section is small,increasing the size of column section has a great influence on Fa.u. However,when the column section size is large,increasing the column section size has little influence on Fa.u. The initial tensile control stress and tendon area have little effect on Fa.u.
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