之字大厦，郑州 / 非常建筑

Typological analysis
无明确使用方的办公楼设计通常被安全、日照等常规因素所左右。在分析了很多办公楼案例之后，我们决定在这个位于郑东新区的高层建筑中采用典型的直线形平面加核心筒结构，同时积极寻找改进的机会。
The design of speculative office towers is usually dictated by sets of conventions such as safety concerns and natural light. The project, a high-rise speculative office tower, is located at the Zhengdong New District in the city of Zhengzhou. After studying various precedents, we decided to accept the prototypical, rectilinear plan with centralized cores as a starting point while looking actively for improvements during the design process.
▼之字大厦南侧视角，View Zigzag Tower from south © 田方方

基地形状
Site geometry
场地的条件恰好提供了改进上述原型的机会：环绕人工湖的一组建筑形成了一个巨大的圆环，作为圆环一部分的场地为带有少许弧度的矩形。我们认为尽管这个弧度很含蓄，但也应该体现出来，于是我们把典型平面的矩形平面变成了“之”字形，从而为原本呈方形的建筑体量增加了一种垂直性。
▼体形生成分析，Shape generation analysis © FCJZ

An opportunity for improvement was presented by the site itself—a slightly curved rectilinear parcel that is a part of a monumental ring around an artificial lake. We believe the curvature, however subtle, should be acknowledged and so transformed the rectangular plan into a zigzagged configuration. Such move also added a sense of verticality to an otherwise blocky volume.
▼航拍郑州龙湖金融岛，Aerial view of Zhengzhou Financial Island © 田方方

▼鸟瞰之字大厦，Bird’s eye view of Zigzag Tower © 田方方

平面和空间
Floor plan and space
“之”字形的折线形成锯齿形平面，提供了更多的阳角空间和更好的视野，使开放空间的感受更像一组小尺度空间的组合。在剖面上，两个核心筒之间设置了一个中庭，两组廊桥穿越其中，这样人们在建筑内部也可以感受到建筑的垂直性以及空间的戏剧性。
▼结构体系，Structural system © FCJZ

▼通风分析，Ventilation analysis © FCJZ

The zigzag configuration offers a floor plan with multiple corners for better views and a sense of spatial aggregation brought by the smaller increments. In sectional design, we devised between the cores an atrium that penetrates all floors and spanned by footbridges so the building’s dramatic verticality can be experienced from within.
▼之字大厦主立面，Façade of Zigzag Tower © 田方方

▼西北侧视角，View from northwest © 田方方

▼折线形立面，Zigzag elevation © 田方方

▼核心筒，Core tube © 田方方

▼中庭连桥，Footbridges in the atrium © 田方方

结构和经济
Structure and economy
我们采用了核心筒+外围密柱的无梁钢筋混凝土结构，空间完全开放、灵活，可以根据需要分隔成不同大小的办公室。无梁结构使我们得以在降低层高的同时保持空间净高，在建筑总高度不变的情况下多做出一层使用空间。
▼核心筒分析，Core tubes analysis © FCJZ

▼结构体系，Structural system © FCJZ

The beam-free, reinforced-concrete structural system with central cores and peripheral columns creates a total open space flexible for further division. Without beams, we were able to reduce the floor height— but not the ceiling height— to include an extra floor within the building height limit.
▼室内空间，Interior space © 田方方

▼通风窗，Airy window © 田方方

立面设计
Facade design
外围的密柱为承重与自然通风的功能相间布置，密柱被设在围护界面之外，进一步加强了建筑的垂直感。我们将柱子在高楼层扭转一定的角度，到低楼层则每两根合为一根，保证低楼层的室内外空间有充分互动。
▼立面体系，Facade system © FCJZ

Peripheral columns for load bearing and natural ventilation are placed in alternation outside the building enclosure, reinforcing the vertical composition of the volumes. Neighboring columns twist and converge with the descending height for better indoor-outdoor interaction on the lower floors.
▼低楼层立面局部，Elevational details at lower floors © 田方方

▼高层密柱的扭转面，The panel of the twisting columns on the upper floors © 田方方

▼夕阳中的之字大厦， Zigzag Tower in the sunset © 田方方

▼之字大厦总图，Site plan © FCJZ

▼之字大厦首层平面，Ground floor plan © FCJZ

▼之字大厦标准层平面，Typical floor plan © FCJZ

▼之字大厦剖面，Section © FCJZ

▼之字大厦立面，Elevations© FCJZ