钢筋混凝土空间框架结构连续倒塌性能的试验研究
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摘要
采用拟静力试验方法进行了钢筋混凝土空间框架的连续倒塌试验。试验模型按非抗震要求设计,用机械千斤顶替换底层长边中柱以模拟其初始失效,用电液伺服千斤顶作用在模型顶层以模拟上部结构重力荷载。对底层长边中柱进行分级卸载,模拟其初始失效后钢筋混凝土框架结构连续倒塌全过程,观测并分析了抗力-位移曲线及结构塑性铰出现位置、顺序,结构受力机制的转换过程。试验结果表明,纵向框架抗倒塌机制包括梁机制、复合机制和悬链线机制,而横向框架抗倒塌机制仅包括梁机制。
The pseudo-static experiment was finished to investigate progressive collapse performance of a reinforced concrete spatial frame structure,which was designed without seismic demand.The middle-side column of the bottom floor was replaced by mechanical jacks to simulate its failure.Based on the experimental results,resistance-displacement curve,plastic hinge development history and load transferring mechanism of the model frame were analyzed.It is concluded that beam mechanism,compound mechanism and catenary mechanism all work to resist progressive collapse as for the longitudinal frame,while only beam mechanism plays a part as for the transverse frame.
The pseudo-static experiment was finished to investigate progressive collapse performance of a reinforced concrete spatial frame structure,which was designed without seismic demand.The middle-side column of the bottom floor was replaced by mechanical jacks to simulate its failure.Based on the experimental results,resistance-displacement curve,plastic hinge development history and load transferring mechanism of the model frame were analyzed.It is concluded that beam mechanism,compound mechanism and catenary mechanism all work to resist progressive collapse as for the longitudinal frame,while only beam mechanism plays a part as for the transverse frame.
引文
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[3]BAO Y H,KUNNATH S K,EL-TAWIL S,et al.Macro-model-based simulation of progressive collapse:RC framestructures[J].Journal of Structural Engineering,2008,134(7):1079-1091.
[4]KFIR M,THIERRY J M,YVES R,et al.Comparison andstudy of different progressive collapse simulation tech-niques for RC structures[J].Journal of Structural Engi-neering,2009,135(6):685-697.
[5]GSA.Progressive collapse analysis and design guidelinesfor new federal office buildings and major modernizationprojects[S].2005.
[6]DOD.Unified Facilities Criteria:Design of buildings to re-sist progressive collapse[S].2006.
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