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Improving Resiliency in Buildings with Precast

机译：使用预制件提高建筑物的弹性

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Precast concrete for student housing, residential or commercial tower construction can not only provide owners with the efficiencies of prefabrication, but also with a high-performing resilient, earthquake resistant structure. The Escondido Village Graduate Residences project at Stanford University is a recent illustration of the resiliency of precast, in which the 10-story residential towers demonstrate inherent enhanced performance levels as defined by ASCE 41. The buildings are constructed entirely of precast concrete elements with no cast-in-place topping slabs for the main floor diaphragms. The precast integrated the building's architecture and concrete moment frame lateral system into unified components, eliminating the need for separate additional cladding to create the architectural art deco aesthetic. This paper demonstrates the performance benefits of precast concrete through the redundancy of almost every column and beam participate in the lateral force resisting system. In an environment where offsite labor was provided much more efficiently than on-site labor, every line of framing was designed as a lateral system moment frame, reducing costs that would typically increase on non-precast projects. Precast concrete also delivered the greatest cost benefit through repetition of element size and rebar detailing, which lend themselves well to a high level of structural redundancy and ductility. Additionally, this project's large columns, which were dictated by its architecture, coupled with the precast contractor's desire to have uniform rebar layouts, align succinctly with the ductile strong column-weak beam design mandated by moment frame systems. Making minor modifications to the code level reinforcing and providing uniform rebar sizing as dictated by Clark Pacific allowed the design team to easily meet the enhanced earthquake performance objective for the buildings with minimal added cost. As demonstrated by the Graduate Residences, precast building systems create a unique opportunity for engineers to provide owners with improved seismic resilience through a project delivery method that streamlines construction, eliminates the added cost of architectural cladding and significantly reduces onsite construction timelines.
机译：用于学生住房，住宅或商业塔楼建筑的预制混凝土不仅可以为业主提供预制效率，而且还可以提供高性能的抗震抗震结构。斯坦福大学的Escondido乡村研究生住宅项目是预制房屋弹性的最新例证，其中10层住宅塔楼显示出ASCE 41所定义的固有增强的性能水平。这些建筑物完全由预制混凝土构件建造而成，没有浇铸主地板隔膜的就地覆盖板。预制件将建筑物的建筑和混凝土弯矩框架的横向系统集成到统一的组件中，从而无需单独的附加覆层即可营造出建筑艺术装饰的美感。本文通过几乎每根立柱和梁参与侧向抗力系统的冗余性，证明了预制混凝土的性能优势。在提供比现场劳动力高效得多的非现场劳动力的环境中，每帧结构都被设计为横向系统力矩框架，从而降低了通常在非预制项目上会增加的成本。预制混凝土还通过重复单元尺寸和钢筋细化而获得了最大的成本收益，这使其自身具有很高的结构冗余度和延展性。此外，该项目的大型立柱由其架构决定，再加上预制承包商对钢筋布局的要求，使其与弯矩框架系统要求的延展性强的立柱弱梁设计简洁一致。根据Clark Pacific的要求，对代码级别进行了微小的修改以增强钢筋强度并提供统一的钢筋尺寸，从而使设计团队能够以最少的增加成本轻松实现建筑物的增强抗震性能目标。正如毕业生住宅所证明的那样，预制建筑系统为工程师提供了独特的机会，可以通过简化施工，消除建筑立面的额外成本并显着减少现场施工时间表的项目交付方法，为业主提供增强的抗震能力。

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