Development of Hybrid OCB Beam for the Long-span Building Structures

Doo-sung Lee, Sang-Yeon Kim, Tae-Kyun Kim
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Abstract

The building structure in Korea is planned to maximize the use of space in recent. The hybrid OCB(Optimized Composite Beam) beam is developed to take advantage of using the space. The OCB beam is composed of the steel H-beam section reinforced by open strands in negative moment zone and the pretensioned PSC concrete section in positive zone. Flexural behavior of typical architectural hybrid OCB beam section was investigated by F.E.M. The 15m, 20m, 30m OCB models were tested on nonlinear material and geometry under static loading system. Following results are obtained from the analysis; 1)The OCB beam develop initial flexural cracking over full service loading. 2)Overall deflections of OCB beam under the service loads are less than those of the allowable limits in KCI Code(2012). 3)The ultimate load capacity get over the nominal strength of the OCB main section. The OCB beam is verified of structural reliability from the finite element analysis.
大跨度建筑结构混合OCB梁的研制
最近,韩国的建筑结构是为了最大限度地利用空间而设计的。为了充分利用空间优势,开发了混合型优化组合梁。OCB梁由负弯矩区开筋h型钢截面和正弯矩区预应力PSC混凝土截面组成。采用有限元法研究了典型建筑混合OCB梁截面的抗弯性能,并对15m、20m、30m的OCB模型进行了静力加载下的非线性材料和几何结构试验。分析得到以下结果:1) OCB梁在全荷载作用下出现初始弯曲开裂。2)使用荷载作用下OCB梁的总挠度小于KCI规范(2012)的允许限值。3)极限承载能力超过OCB主截面标称强度。通过有限元分析,验证了OCB梁的结构可靠性。
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