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首页> 外文会议>Structural Engineers Association of California(SEAOC) Convention; 20050928-1001; San Diego,CA(US) >Seismic Retrofit of Orange Coast College Watson Hall
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Seismic Retrofit of Orange Coast College Watson Hall

机译：橙色海岸学院沃森大厅的抗震改造

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摘要

Watson Hall, a symbolic structure on the campus of Orange Coast College is a four-story reinforced concrete building that was constructed in the mid 1960's. As with most concrete buildings designed in California before 1976, the building's moment frame does not possess the ductility required to survive the displacements induced by large earthquakes. The lateral reinforcement is not anchored within the confined core and the shear capacity of columns and joints is typically less than the shear corresponding to the development of maximum moment in the columns. Nonlinear analyses confirmed that the existing building will not provide life safety protection to occupants during the Design Earthquake and needs to be rehabilitated. A retrofit design by prior consultants, which added new shear walls and involved extensive work to the foundations, was rejected because it was too expensive. Thus, a new design that improves the building's seismic performance and conforms to the project's budgetary constraints needed to be developed. The design team selected a retrofit scheme that utilizes chevron braces to reduce the earthquake-induced displacements to acceptable levels. Fiber reinforced polymers were also used to improve the shear capacity and ductility of the columns. Three types of brace schemes were studied -conventional braces, buckling reduced braces and braces with viscous dampers. This paper compares the approaches to the design of the various options and describes the advantages and challenges associated with each scheme.
机译：沃森大厅（Watson Hall）是位于橙色海岸学院校园内的象征性建筑，是一栋四层高的钢筋混凝土建筑，建于1960年代中期。与1976年之前在加利福尼亚设计的大多数混凝土建筑物一样，该建筑物的弯矩框架不具备承受大地震引起的位移所需的延展性。侧向钢筋没有锚固在承压芯中，并且柱和节点的抗剪承载力通常小于对应于柱中最大弯矩发展的剪力。非线性分析证实，现有建筑物在设计地震期间将无法为居住者提供生命安全保护，需要对其进行修复。以前的顾问进行的翻新设计增加了新的剪力墙，并为基础做了大量的工作，但由于成本太高而被拒绝。因此，需要开发一种改进建筑物抗震性能并符合项目预算约束的新设计。设计团队选择了一种改进方案，该方案利用人字形支撑将地震引起的位移降低到可接受的水平。纤维增强的聚合物也被用来提高柱子的剪切能力和延展性。研究了三种类型的支撑方案-传统支撑，屈曲减小支撑和带有粘性阻尼器的支撑。本文比较了各种方案的设计方法，并描述了每种方案的优点和挑战。

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