1.广西大学土木建筑工程学院,广西 南宁 530004
2.工程防灾与结构安全教育部重点实验室, 广西 南宁 530004
3.广西北投交通养护科技集团有限公司,广西 南宁 530007
杨涛(1979—),男,副教授,博士。主要从事混凝土结构受力性能研究。E-mail: yt48440002@163.com
郝天之(1980—),男,正高级工程师,博士。主要从事工程结构监测与检测评估。E-mail: htz0537@163.com
纸质出版:2022-02-28
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杨涛,谢元康,郝天之.装配式混凝土框架子结构动态倒塌性能试验研究[J].防灾减灾工程学报,2022,42(01):126-134.
YANG Tao,XIE Yuankang,HAO Tianzhi.Experimental Study on Dynamic Collapse Performance of Prefabricated RC Frame Substructures[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):126-134.
杨涛,谢元康,郝天之.装配式混凝土框架子结构动态倒塌性能试验研究[J].防灾减灾工程学报,2022,42(01):126-134. DOI: 10.13409/j.cnki.jdpme.202001029.
YANG Tao,XIE Yuankang,HAO Tianzhi.Experimental Study on Dynamic Collapse Performance of Prefabricated RC Frame Substructures[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):126-134. DOI: 10.13409/j.cnki.jdpme.202001029.
为了研究装配式混凝土框架结构的连续倒塌性能,设计了6个比例为1/4的框架子结构模型,通过快速抽柱试验研究了框架梁的跨高比、拼接节点位置和预应力等参数对其动态倒塌性能的影响。试验结果表明,中柱失效后在框架梁端和框架梁拼接节点的后浇混凝土区均产生了少量裂缝;在框架梁跨度相同的情况下,现浇混凝土框架子结构的最大动态位移响应小于装配式框架子结构;在预制节段的框架梁内施加预应力后,倒塌荷载对装配式框架结构的动力冲击作用增大,但结构的最大动态位移和梁端钢筋应变等动态倒塌响应反而减小;与现浇混凝土框架子结构相比,中柱失效后装配式框架产生的结构损伤更大;当预制节段的拼接节点位置向框架柱靠近时,装配式框架的最大动态位移响应增大;试验所得预制装配式试件的位移动力增大系数和梁端钢筋应变动力增大系数的最大值分别为1.39和1.62,这可为开展装配式混凝土框架结构静力倒塌分析时倒塌荷载动力增大系数的取值提供参考。
To study the progressive collapse of prefabricated reinforced concrete (RC) frame structures, six 1/4 scale frame substructures were designed and tested by fast removing columns. The influence of several parameters, such as the span to depth ratios of frame beams, the splicing joint positions as well as prestress, on the dynamic collapse performance was investigated. Experimental results show that at the frame beam ends and in the regions of post-poured concrete of the splicing joints for the prefabricated frames appeared a few cracks after the middle column failed. The maximum dynamic displacement response of the monolithic RC frame substructure was smaller than that of the prefabricated frame substructure with the same beam span. After prestress was applied on the frame beams of the prefabricated segments, the dynamic impact of collapse load on the prefabricated frame increased; however, the dynamic responses, including the maximum dynamic displacement and the strain of the longitudinal reinforcing bars at the beam ends, reduced instead. Compared with the monolithic RC frame substructure, the failure of the middle column caused more damage to the prefabricated frames. When the splicing joints of the prefabricated segments moved towards the frame column, the maximum dynamic displacement responses of the prefabricated frames increased. The maximum dynamic increase factors of the displacement and the strain of the reinforcing bars at the beam ends for the prefabricated substructures were 1.39 and 1.62, respectively, which may provide a reference for the determination of the dynamic increase factor of collapse load when the static collapse analysis is conducted on prefabricated RC frame structures.
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