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首页> 外文会议>Structural Engineers Association of California(SEAOC) Convention; 20050928-1001; San Diego,CA(US) >Cable-nets and 'Rocker Mechanisms' The New Beijing Poly Plaza
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Cable-nets and 'Rocker Mechanisms' The New Beijing Poly Plaza

机译：有线网络和“摇晃机制”新北京保利广场

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摘要

Prominently located at a major intersection along Beijing's second ring road, northeast of the Forbidden City, the 100 meter-tall New Beijing Poly Plaza project includes 24 stories of office space, an eight story hanging museum 'lantern' structure and a 90 meter-tall atrium enclosed by what is expected to be the world's largest cable-net supported glass wall - a challenge amplified by the region's high seismicity. The cable-net wall is 90 meters high by 60 meters wide - dimensions that make a simple cable-net supported wall require uneconomical cable sizes and levels of pre-tension. The design is achieved by folding the cable-net around diagonal V-shaped, parallel-strand bridge cables, thus subdividing the wall into three planar facets and reducing the effective cable spans. The parallel-strand cables also support the 'lantern' as it hangs in the atrium space without any columns extending to grade. Gravity loads from the 'lantern' are used to induce high levels of pre-tension in the parallel-strand cables. As the parallel-strand cables diagonally connect diaphragms that are 11 stories apart, lateral drift in the base building due to seismic or wind loads causes brace forces in the diagonal cables, increasing the design forces beyond reasonable levels. An innovative 'rocker mechanism' is used to isolate the cable hanger system from forces induced by lateral drift. The 'rocker mechanism' is architecturally 'celebrated' - an exposed articulated joint mechanism made of rigid pin-connected castings which perform as a pulley equivalent. The mechanism allows the 'V'-shaped parallel strand cables to behave as a continuous cable running around a pulley, offsetting induced tensile and compressive brace forces in the cables as the building drifts. Following extensive aero-elastic wind tunnel testing, performance-based fire engineering, and scale-model shake table testing, the New Beijing Poly Plaza is presently under construction with the structure topped out, and the cable-net scheduled for completion in October 2005.
机译：这座100米高的新北京保利广场项目位于北京紫禁城东北沿北京二环路的主要交叉路口，包括24层办公空间，8层悬挂博物馆的“灯笼”结构和90米高的博物馆中庭被预计将是世界上最大的电缆网支撑的玻璃墙包围-该地区的高地震活动加剧了这一挑战。电缆网墙高90米，宽60米-尺寸使得简单的电缆网支撑墙需要不经济的电缆尺寸和预张力水平。通过将电缆网围绕对角V形，平行绞合的桥式电缆进行折叠来实现设计，从而将墙细分为三个平面，并减少有效的电缆跨距。平行线电缆还支持“灯笼”，因为它悬挂在中庭空间中，而没有任何柱子延伸至坡度。来自“灯笼”的重力载荷用于在平行绞线电缆中引起高水平的预应力。由于平行线电缆对角连接相距11层的膜片，基础建筑物在地震或风荷载作用下的侧向位移会在对角电缆中产生支撑力，从而使设计力超出合理水平。创新的“摇杆机构”用于将电缆吊架系统与横向漂移所产生的力隔离。 “摇杆机构”在结构上“受过赞誉”-由刚性销钉连接的铸件制成的裸露铰接式关节机构，其作用相当于皮带轮。该机制使“ V”形平行多股电缆的行为就像绕在滑轮上的连续电缆一样，抵消了建筑物漂移时电缆中的感应拉力和压缩拉力。经过广泛的空气弹性风洞测试，基于性能的消防工程和比例模型振动台测试，新北京保利广场目前正在建设中，其结构已达到顶峰，电缆网计划于2005年10月完成。

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