大连国际会议中心支撑筒设计与试验研究

大连国际会议中心工程以平面分布不规则的14个筒体为整个工程结构水平和竖向主要支承构件。由于结构形式的特殊性,筒体受力形式有别于传统高层建筑结构中的核心筒。为满足抗震设计及结构连接构造的需要,工程采用内藏带斜支撑型钢桁架混凝土组合筒体,并针对受力特点采取必要的构造措施。为深入研究该筒体性能,结合工程实际进行了缩尺筒体模型抗震试验研究,包括刚度及其退化过程、承载力、延性、抗震耗能能力及破坏特征、构造措施有效性等。根据试验结果,针对试验中薄弱部位采取进一步加强措施,提高筒体抗震能力。研究表明,内藏带斜支撑型钢桁架混凝土组合筒体具有很高的承载能力;内藏钢框架可明显提高筒体承载力、延性,阻止刚度退化;筒体不规则洞口形成薄弱部位,虽然采取若干措施,支撑筒整体承载力仍然有较明显的降低,因此应尽量减少短墙开洞,同一截面处不应开多个洞口。

Design and test research on the support tube in Dalian International Conference Center

The structure of Dalian International Conference Center consists of 14 concealed steel frame reinforced concrete transport cylinders resisting the entire building vertical load and horizontal lateral.Due to the peculiar structure of the cylinder,the force is different from the traditional structure of the high-rise building of the core barrel.In order to meet the aseismic design and connection construction of structure,the hide inside with inclined brace steel truss concrete composite cylinder was used in this project,and tectonic measures were taken according to the necessary stress characteristics.For the further study of the cylinder performance,the scale cylinder model experiment was studied on the seismic behavior combined with practical engineering,including its stiffness and deterioration process,bearing capacity,ductility,energy dissipation capacity,failure characteristics and tectonic measures effectiveness.Based on the test results,further measures were taken for the test of weak parts in the engineering in order to improve the seismic capacity of cylinder.Research shows that inside with inclined brace steel frame reinforced concrete combined cylinder has high bearing capacity.Concealed steel frame can obviously improve the cylinder bearing capacity,ductility,stiffness degradation of cylinder block.Irregular hole forms a weak position,although a number of measures are taken,the bearing capacity of support tube is still obviously decreased.Therefore,minimizing openings in the short wall is necessary and the same section should not have more than one hole.