基于DBJ/T 15-92—2021《高层建筑混凝土结构技术规程》设计的RC结构抗侧超强能力试验研究  

Experimental study on lateral overstrength capacity of RC structures designed with DBJ/T 15-92-2021 ‘Technical specification for concrete structures of tall building’

作　　者：凌育洪[1,2,3] 张浩鹏 周靖 方小丹[1,3,4] LING Yuhong;ZHANG Haopeng;ZHOU Jing;FANG Xiaodan(State Key Laboratory of Subtropical Building and Urban Science,South China University of Technology,Guangzhou 510640,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;Engineering Seismic Research Center of Guangdong,Guangzhou 510640,China;Architectural Design and Research Institute of South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学亚热带建筑与城市科学全国重点实验室,广东广州510640 [2]华南理工大学土木与交通学院,广东广州510640 [3]广东高校工程抗震研究中心,广东广州510640 [4]华南理工大学建筑设计研究院有限公司,广东广州510640

出　　处：《建筑结构学报》2024年第12期1-18,共18页Journal of Building Structures

基　　金：国家自然科学基金项目(12172135,52378512);广东省自然科学基金项目(2022A1515010878)。

摘　　要：为研究钢筋混凝土(RC)结构的抗侧超强能力与安全储备,进行了缩尺平面结构试件的低周反复试验与实际结构的Pushover分析。考虑抗震构造等级,采用允许应力法设计3个12层RC框架结构和3个12层RC框架-剪力墙结构。选取底部3层1榀平面结构,缩尺比为1/4,分2批共制作12个缩尺平面结构试件,对其进行拟静力试验。考虑高度、楼板翼缘与填充墙等参数,采用Perform-3D建立模型开展Pushover分析探讨抗侧力体系超强系数与侧向延性的变化规律。试验结果表明:12个缩尺平面试件以压弯破坏模式为主,滞回曲线饱满、延性较大,框架结构试件、框架-剪力墙结构试件的屈服超强系数平均值分别为2.21和2.26;抗震构造等级高的试件,呈现超强能力更高、延性更大的趋势。Pushover分析结果表明:罕遇地震作用下RC结构性能点抗侧力超过屈服荷载、未到达峰值荷载,结构超强能力满足设防烈度地震后不坏、罕遇地震后可修、不倒塌的抗震设计要求。建议按DBJ/T 15-92—2021《高层建筑混凝土结构技术规程》设计的RC抗震结构的屈服超强系数值取2.0。In order to study the lateral overstrength capacity and safety reserve of reinforced concrete(RC)structure,the low-cyclic reversed loading tests of the scaled plane structural specimens were conducted,as well as the pushover analysis of the prototype building structure.Taking seismic structural level as the parameter,the allowable stress method was adopted to design three twelve-storey RC frame structures and three twelve-storey RC frame-shear wall structures.One-bay plane structure at bottom three-stories was selected to conduct the seismic test of twelve(1/4 scaled)specimens,which included two batches of specimens constructed by two groups at various periods.Taking the building height,slab flange and infill wall as the parameters into consideration,the structural models were established with using the Perform-3D to conduct the pushover analysis,the change mechanism of different parameters was researched,such as the overstrength coefficient of lateral-force resisting system and the lateral ductility.The low-cyclic reversed loading experimental results indicate that the main damage mechanism of the twelve scaled plane specimens is compression and bending damage.The hysteresis curves are full,the ductility is relatively large.The average of yielding overstrength coefficient is 2.21 for frame structure specimens and 2.26 for frame-shear structure specimens.The tendency indicates that the overstrength capacity is higher and the ductility is better for specimens designed with higher seismic structural level.Pushover analysis results indicate that the lateral force-resisting capacity at performance-point of RC structures after encountering an earthquake of rare intensity exceeds the yielding load,rather than the peak load,which illustrates that the overstrength capacity satisfies the seismic design requirements of not damaged after a fortification intensity earthquake,and reparable or not collapsed after a rare earthquake.The recommended value of yielding overstrength coefficient is 2.0 for the RC seismic structures d

关 键 词：RC结构 抗侧超强能力 低周反复试验 PUSHOVER分析 允许应力法 

分 类 号：TU525.9[建筑科学—建筑技术科学]