CCTV新台址主楼高含钢率SRC柱承载性能研究  

Load-carrying capacity of high steel ratio SRC columns used in New CCTV Building

作　　者：盛和太[1] 郭彦林[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《建筑结构学报》2008年第3期47-53,共7页Journal of Building Structures

摘　　要：本文主要研究对象为中央电视台(CCTV)新台址工程主楼外筒中采用的高含钢率SRC柱。采用有限元方法中的六面体单元法和简化截面纤维单元法,分析了高含钢率SRC柱的计算模型和主要参数(含钢率、长细比、轴压比)对其承载力性能的影响,并对两种分析方法的计算结果进行了对比。计算结果表明,高含钢率SRC柱在常用长细比范围内,其承载力性能与短柱相似;同时在较高轴压比作用下,高含钢率SRC柱仍具有较好的延性;六面体有限单元法、简化截面纤维单元法均可用于高含钢率SRC柱的计算分析,基于平截面假定之上的简化截面纤维单元分析方法可以比较精确地分析高含钢率SRC柱的静力承载力;最后,通过比较不同计算方法所获得的计算结果,本文建议将《钢骨混凝土结构设计规程》(YB9082—97)所推荐的含钢率不大于15%作为高含钢率和普通含钢率SRC柱含钢率的分界点。这些结论对高含钢率SRC柱受力性能的进一步研究和实际工程推广应用提供了理论基础。Behavior of steel reinforced concrete （SRC） columns used in New CCTV Building was investigated theoretically in this paper. The calculation models, analytical methods and influences of parameters on SRC columns were focused. It is found that the high steel ratio SRC columns＇ behavior is similar to that of the short columns when their slenderness ratios range within the common used cases, and have higher strength and ductility when they are loaded under a higher compression ratio. It was pointed out that the calculation models and analytical methods described in this study are appropriately used to study the behavior of high steel ratio SRC columns and the simplified sectional fiber method can be used to analysis the SRC columns＇ static load-carrying capacity. It is proposed from a lot of numerical analysis results obtained in accordance with different analytical methods that the steel ratio of 15% may be the cut-off point between high steel ratio and ordinary steel ratio SRC columns. All these conclusions will provide a theoretical basis for further researches and applications of high steel ratio SRC columns.

关 键 词：SRC柱 高含钢率 承载力 有限元分析 长细比 轴压比 

分 类 号：TU375.302[建筑科学—结构工程] TU311.41