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Design of the Tallest Reinforced Concrete Structure in California – a 58-Story Residential Tower in San Francisco

机译:加利福尼亚州最高的钢筋混凝土结构设计–旧金山的58层住宅塔楼

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This paper summarizes the analysis and design aswell as special component testing performed forthe Millennium Tower project located at 301Mission Street in San Francisco. Whencompleted in 2008, at 645 feet, this project will bethe tallest reinforced concrete structure situated ina seismic zone 4 region, the 4thtallest structure inthe City of San Francisco, and the tallestresidential building in the U.S. west of Chicago.The tower has 58 occupied floors and combineswith an adjacent 12-story tower and surroundingpodium to provide over 1,150,000 sf of luxurycondominiums and recreational amenities. Thetower's immense height posed many challengesand required the creative use of technologies andcutting edge innovations.The tower's dual lateral system iscomprised of a 36-inch-thick concrete shear wallcore and partial perimeter Special MomentResisting Frames (SMRF). The heaviest buildingever constructed in San Francisco on a psf basis,the tower is supported by a mat foundation restingon 950 130-ton piles, each approximately 80 feetin length. Outrigger trusses connect the interiorcore with robust perimeter super-columns at threeintermediate levels to control lateral deflections. In order to reduce the required floor-to-floorheights, shallow steel link beams are used within the shear wall core as coupling beams, in lieuof deeper diagonally reinforced concrete beams.Closely spaced ties in columns and walls posed a challenge to the placement of the highstrength 10 ksi concrete needed for this project. To alleviate some of this congestion, DeSimonespecified a system of Welded Reinforcement Grid (WRG) that eliminated all hooks, significantlyreduced the volume of rebar, and decreased overall labor costs. A successful laboratory test
机译:本文将分析和设计总结如下: 以及为执行的特殊组件测试 位于301的千禧塔项目 在旧金山任务街。什么时候 该项目将于2008年完工,高度为645英尺 最高的钢筋混凝土结构位于 地震带4区,第四区 最高的结构 旧金山市,最高的 美国芝加哥以西的居民楼。 塔楼有58层被占用并合并 以及毗邻的12层塔楼和周围 讲台提供超过1,150,000平方英尺的豪华房 公寓和娱乐设施。这 塔的巨大高度带来了许多挑战 并要求创造性地使用技术和 尖端的创新。 塔的双向系统是 由36英寸厚的混凝土剪力墙组成 核心和局部周边的特殊时刻 抵抗框架(SMRF)。最重的建筑 曾经在旧金山以每平方英尺为单位建造, 塔架由垫子基础支撑 在950 130吨的桩上,每桩约80英尺 在长度上。支腿桁架连接内部 核心,带有坚固的周边超级柱(三个) 中间水平来控制横向偏斜。为了减少所需的地板到地板 高度,在剪力墙芯内使用浅钢连接梁作为耦合梁,代替 更深的对角钢筋混凝土梁。 柱子和墙壁中紧密间隔的系带给高架的放置带来了挑战 该项目需要的强度为10 ksi的混凝土。为了缓解这种拥堵,DeSimone 指定了一个焊接钢筋网(WRG)系统,该系统消除了所有挂钩 减少了螺纹钢的数量,并降低了整体人工成本。成功的实验室测试

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