CCTV新台址主楼外筒“米”形节点滞回性能的试验研究  

Experimental investigation to the complex connections in the external tube system of New CCTV Building

作　　者：郭彦林[1] 高巍[1] 林冰[1] 盛和太[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63-72,共10页Journal of Building Structures

摘　　要：中央电视台(CCTV)新台址主楼外筒由SRC组合斜柱、箱形截面钢支撑及工形截面钢梁组成,其外筒节点呈"米"形。本文对外筒中两种有代表性的"米"形节点进行了模型试验研究,考察了两个关键节点和两个典型节点在反复荷载作用下的延性性能和滞回性能,检验强节点弱构件的设计思想是否满足。试验采用对与节点相连的柱子施加恒定轴力,对两对交叉斜撑施加反复交叉拉压轴力,逐步循环加载直至节点破坏。试验现象及结果表明,所有试件在节点板区域破坏前,其所连接的杆件(斜撑)已失去承载力,节点板在杆件达到极限承载能力时部分进入塑性,但仍具有较高的安全储备。作者建议节点板与斜撑、柱连接处形成光滑过渡并在深化设计中改进,避免应力集中现象造成节点延性降低。The external tube system of New CCTV Building was composed of steel reinforced concrete columns, steel braces with box section and steel beams with ＂I＂ section, as well as the butterfly shape connection joints where these columns, braces and beams concentrated. The behavior of the butterfly shape connection joints were investigated experimentally in this study. A test program has been carried out to estimate cyclic behavior of these two kinds of representative connections, namely critical connections and typical connections. The experiment loading structure and experimental phenomenon have been described carefully, and the failure mechanisms of the models have been analyzed. It is proposed that the connection plates connecting braces, beams and column should be made smoothly between and among them to avoid stress centralization. The obtained results were evaluated and a conclusion was drawn, which may serve as the fundamental support and improvement to the design check and construction of New CCTV Building.

关 键 词：关键节点 典型节点 试验研究 破坏模式 

分 类 号：TU973.17[建筑科学—结构工程] TU317.1