受火后型鋼混凝土框架結(jié)構(gòu)抗震性能研究
發(fā)布時間：2018-11-27 06:37
【摘要】：為了給受火后型鋼混凝土框架結(jié)構(gòu)的性能評估及修復加固提供方法,進行了火災后型鋼混凝土框架結(jié)構(gòu)的抗震性能研究。在ABAQUS平臺上,采用梁單元,同時通過編制材料子程序和場變量子程序,建立了可進行型鋼混凝土框架結(jié)構(gòu)火災升降溫作用下的力學性能及受火后抗震性能分析的計算模型。利用該計算模型對火災升降溫作用下型鋼混凝土框架結(jié)構(gòu)的變形及內(nèi)力進行了分析。同時,考慮起火層位置、受火時間等參數(shù)的影響,采用考慮升降溫的火災后靜力非線性分析方法和動力彈塑性時程分析方法,對火災后型鋼混凝土框架結(jié)構(gòu)的破壞形態(tài)、地震作用后結(jié)構(gòu)承載能力、變形特征等抗震性能進行了參數(shù)分析。分析表明,火災升降溫過程中,由于結(jié)構(gòu)升溫的滯后性,構(gòu)件的變形增長及恢復也滯后于火災空氣升降溫過程,受火后構(gòu)件有殘余變形;針對火災發(fā)生在某一層的火災工況,受火后框架承受水平地震(靜力)作用時,框架破壞機構(gòu)出現(xiàn)在底部3~5層;當受火層位于底層時,受火后框架的水平地震作用后結(jié)構(gòu)承載能力降低幅度最大,受火時間為180、300 min時降幅分別為8%、9%;受火層位置越低,框架頂部位移越大;隨受火時間增加,框架頂部位移增大。
[Abstract]:In order to provide methods for performance evaluation and repair and reinforcement of steel reinforced concrete frame structure after fire, the seismic behavior of steel reinforced concrete frame structure after fire was studied. On the platform of ABAQUS, using beam element, material subroutine and field variable subroutine, the calculation model of mechanical properties and seismic behavior analysis of SRC frame structure under the action of fire rising and cooling is established. The deformation and internal force of SRC frame structure under the action of rising and cooling of fire are analyzed by using this model. At the same time, considering the location of fire layer and the influence of fire time and other parameters, the failure pattern of steel reinforced concrete frame structure after fire is analyzed by the nonlinear static analysis method and dynamic elastoplastic time history analysis method, which takes into account the rise and fall of fire temperature. The seismic properties such as the bearing capacity and deformation characteristics of the structure after earthquake are analyzed. The analysis shows that in the process of fire rising and cooling, because of the lag of structure heating, the deformation growth and recovery of components lag behind the process of rising and cooling of fire air, and there is residual deformation of the components after fire. When the frame is subjected to horizontal earthquake (static) after fire, the failure mechanism of the frame appears at the bottom of 3 layers. When the fire layer is located at the bottom of the frame, the bearing capacity of the frame decreases the most after the horizontal earthquake, when the fire time is 180300 min, the decrease is 8 / 9, respectively, and the lower the fire layer is, the greater the displacement of the top of the frame is. With the increase of fire time, the top displacement of frame increases.
【作者單位】： 中國建筑科學研究院;中電投工程研究檢測評定中心;山東青年政治學院經(jīng)濟管理學院;
【基金】：國家自然科學基金項目(51778595,51278477) 北京市自然科學基金項目(8172052)
【分類號】：TU352.11;TU398.9
[Abstract]:In order to provide methods for performance evaluation and repair and reinforcement of steel reinforced concrete frame structure after fire, the seismic behavior of steel reinforced concrete frame structure after fire was studied. On the platform of ABAQUS, using beam element, material subroutine and field variable subroutine, the calculation model of mechanical properties and seismic behavior analysis of SRC frame structure under the action of fire rising and cooling is established. The deformation and internal force of SRC frame structure under the action of rising and cooling of fire are analyzed by using this model. At the same time, considering the location of fire layer and the influence of fire time and other parameters, the failure pattern of steel reinforced concrete frame structure after fire is analyzed by the nonlinear static analysis method and dynamic elastoplastic time history analysis method, which takes into account the rise and fall of fire temperature. The seismic properties such as the bearing capacity and deformation characteristics of the structure after earthquake are analyzed. The analysis shows that in the process of fire rising and cooling, because of the lag of structure heating, the deformation growth and recovery of components lag behind the process of rising and cooling of fire air, and there is residual deformation of the components after fire. When the frame is subjected to horizontal earthquake (static) after fire, the failure mechanism of the frame appears at the bottom of 3 layers. When the fire layer is located at the bottom of the frame, the bearing capacity of the frame decreases the most after the horizontal earthquake, when the fire time is 180300 min, the decrease is 8 / 9, respectively, and the lower the fire layer is, the greater the displacement of the top of the frame is. With the increase of fire time, the top displacement of frame increases.
【作者單位】： 中國建筑科學研究院;中電投工程研究檢測評定中心;山東青年政治學院經(jīng)濟管理學院;
【基金】：國家自然科學基金項目(51778595,51278477) 北京市自然科學基金項目(8172052)
【分類號】：TU352.11;TU398.9
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1 曲恒緒;型鋼混凝土結(jié)構(gòu)計算方法的比較[J];安徽建筑;2003年06期
2 朱s，
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