Experimental study on dynamic collapse performance of prestressed RC frame substructures after middle column demolition
YANG Tao1,2,3，CHEN Wanqing1，HAO Tianzhi2,3,4
1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2. Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China;
3. Key Laboratory of Disaster Prevention and Structural Safety of China Ministry of Education, Guangxi University, Nanning 530004, China;
4. Guangxi Transportation Research & Consulting Co., Ltd., Nanning 530007, China
To study the dynamic collapse performance of prestressed reinforced concrete (PRC) frame structures, five one-fourth scaled frame substructures were designed, and the dynamic collapse behavior of the specimens was investigated by the method of rapid removing a column. Experimental results show that structural damage of the five specimens caused by the impact of the design loads after the removal of a middle column was mainly manifested as the cracking of frame beam ends and the reduction of the structural fundamental frequency. The dynamic vertical displacement of the failure column increases due to the existing of prestress. When the frame beams possess the same spans, application of presress can significantly improve the stress state of the tensile longitudinal reinforcement at the frame beam ends. The dynamic impact effect of collapse load for the specimen without prestress was more significant. Adopting proper span-depth ratio of frame beams and taking suitable prestress action modes help to control the collapse risk of PRC frame structures. Finally, a method for calculating the dynamic increase factors (DIF) of collapse load for PRC frames was presented. Analysis shows that the DIF values based on the experiments and calculations were all less than 2.0. Moreover, reasonable DIF of collapse load for PRC frame structures should be adopted according to the target displacement of failure columns when collapse analysis is conducted using the static method.
杨涛1,2,3，陈万庆1，郝天之2,3,4. 中柱失效后预应力混凝土框架子结构动力倒塌性能试验研究[J]. 振动与冲击, 2020, 39(20): 17-23.
YANG Tao1,2,3，CHEN Wanqing1，HAO Tianzhi2,3,4. Experimental study on dynamic collapse performance of prestressed RC frame substructures after middle column demolition. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(20): 17-23.
[1] 杨涛，陆艺. 建筑结构连续倒塌性能研究进展[J]. 力学与实践，2016，38(6): 612-618.
Yang Tao, Lu Yi. Research advances of progressive collapse of building structures. Mechanics in Engineering，2016，38(6): 612-618.
[2] Sasani M，Sagiroglu S. Progressive collapse resistance of Hotel San Diego[J]. Journal of Structural Engineering， 2008， 134(3): 478-488.
[3] Yi W J，He Q F，Xiao Y，et al. Experimental study on progressive collapse-resistant behavior of reinforced concrete frame structures. ACI Structural Journal，2008，105(4): 433-439.
[4] Su Y，Tian Y，Song X S. Progressive collapse resistance of axially-restrained frame beams. ACI Structural Journal， 2009，106(5): 600-607.
[5] Kokot S，Anthonie A，Negro P，et al. Static and dynamic analysis of a reinforced concrete flat slab frame building for progressive collapse[J]. Engineering Structures，2012， 40(7): 205-217.
[6] Fadcetti A，Kunnath S K，Nisticṑ N. Robustness evaluation of RC frame buildings to progressive collapse[J]. Engineering Structures，2015，86: 242-249.
[7] 周云，陈太平，胡翔，等. 考虑周边结构约束影响的RC框架结构防连续倒塌性能研究[J]. 工程力学，2019，36(1): 216-226.
ZHOU Yun , CHEN Taiping , HU Xiang, et al. Progressive collapse resistance of RC frame structures considering surrounding structural constraints[J]. Engineering Mechanics, 2019, 36(1): 216-226.
[8] 高佳明，刘伯权，黄华，等. 带板钢筋混凝土框架连续倒塌理论分析[J]. 工程力学，2018, 35(7): 117-126.
GAO Jiaming, LIU Boquan, HUANG Hua, et al. Theoretical analysis on the progressive collapse of rc frame structures with slabs[J]. Engineering Mechanics, 2018, 35(7): 117-126.
[9] 乔惠云，杨应华，钟炜辉. 中柱失效下多层框架的连续性倒塌分析与机理研究[J]. 振动与冲击，2018，37(22): 136-143.
QIAO Huiyun，YANG Yinghua，ZHONG Weihui. Progressive collapse analysis and mechanism study for multi-story frame structures with middle-column demolition[J]. Journal of Vibration and Shock, 2018，37(22): 136-143.
[10] 贾明明，杨先霖，吕大刚，等. 基于易损性的RC空间框架填充墙结构连续倒塌能力分析[J]. 建筑结构学报，2018，39(S1): 230-236.
JIA Mingming, YANG Xianlin，Lü Dagang, et al. Fragility-based progressive collapse capacity analysis of RC frame structures with infilling walls[J]. Journal of Building Structures, 2018，39(S1): 230-236.
[11] 骆欢，杜轲，孙景江，等. 地震作用下钢筋混凝土框架结构倒塌全过程振动台试验研究[J]. 建筑结构学报，2017，38(12): 49-56.
LUO Huan, DU Ke, SUN Jingjiang, et al. Shaking table test on complete collapse process of RC frame structure subjected to earthquake[J]. Journal of Building Structures, 2017，38(12): 49-56.
[12] 范云蕾，王杰，王皓磊. 单层体外预应力钢筋混凝土框架抗倒塌试验研究[J]. 中南大学学报(自然科学版)，2018，49(05): 1244-1253.
FAN Yunlei, WANG Jie, WANG Haolei. Experimental study on collapse performance of one-story reinforced concrete frames using external prestressing tendons[J]. Journal of Central South University (Science and Technology), 2018，49(05): 1244-1253.
[13] 潘毅，陈侠辉，姚蕴艺，等. 基于抽柱法的无粘结预应力装配式框架结构连续倒塌分析[J]. 工程力学，2017， 34(12): 162-170.
PAN Yi, CHEN Xiahui, YAO Yunyi. Progressive collapse analysis of unbonded post-tensioned precast rc frame structures using column removal method[J]. Engineering Mechanics, 2017， 34(12): 162-170.
[14] QIAN K, LIU Y, YANG T, et al. Progressive Collapse Resistance of Posttensioned Concrete Beam-Column Subassemblages with Unbonded Posttensioning Strands[J]. Journal of Structural Engineering, 2018, 144(1): 04017182.
[15] 杨涛，连金明，张喜德. 边柱失效后RC板柱结构连续倒塌性能试验研究[J]. 工程科学与技术，2019，51(1): 104–111.
Yang Tao，Lian Jinming，Zhang Xide.Experimental study on progressive collapse performance of RC flat plate structures in the scenario of a side column loss[J].Advanced Engineering Sciences，2019, 51(1):104–111.
