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首页> 外文会议>ATC SEI conference on improving the seismic performance of buildings and other structures >Historic Desmond Building Retrofit-A Case Study of the Seismic Retrofit of a Non-Ductile Concrete Building in the Los Angeles Area
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Historic Desmond Building Retrofit-A Case Study of the Seismic Retrofit of a Non-Ductile Concrete Building in the Los Angeles Area

机译：戴斯蒙德历史建筑的改建-以洛杉矶地区一座非韧性混凝土建筑的地震改建为例

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According to a Los Angeles Times report in Oct. 2013 (Los Angeles Times, 2013), by the most conservative estimate, as many as 50 old concrete buildings in the city of Los Angeles would be destroyed in a major earthquake, exposing thousands to injury or death. To address this concern, the City of Los Angeles recently proposed instituting what are arguably the most ambitious seismic safety regulations in California's history; regulations that would require building owners to retrofit thousands of building deemed to be at risk of collapse during a major earthquake. Non-ductile concrete buildings built before 1980 were singled out as one of two particularly vulnerable structural types requiring attention. This paper presents a case study of seismically retrofitting a historic concrete building located in Los Angeles, California. Designed in 1916, the building originally housed the Willy's Overland Company car dealership and assembly plant, which later became a Desmond's department store warehouse. After the retrofit, the five-story warehouse will be transformed into high quality, creative office space with a ground floor cafe and the addition of a 7,000-square-foot sixth floor that will bring the total size of the building to 82,000 square feet. The retrofit project is currently under construction with full occupancy expected in the summer of 2015. When it is complete, it will be the first of many potential renovations of historic properties located in the South Park district for creative office use. This case study presents an innovative but rigorous approach taken to enable the addition of a story to the existing building by not exceeding the gravity load and lateral force change triggers in Chapter 34 of the 2011 Los Angeles City Building Code (2011 LABC) necessitating retrofit. Although demonstrated to not be required by code, a seismic retrofit was nevertheless instituted; this while continuing to ensure that the changes in force effects in retained existing structural members did not exceed code retrofit triggers. All structural modifications made since the building was originally constructed using very low strength concrete were considered in the evaluations and retrofit design.
机译：根据2013年10月的《洛杉矶时报》报道（《洛杉矶时报》，2013年），根据最保守的估计，在一次大地震中，洛杉矶市多达50座旧混凝土建筑将被摧毁，数千人受伤或死亡。为了解决这个问题，洛杉矶市最近提议制定可以说是加利福尼亚历史上最雄心勃勃的地震安全法规。规定要求建筑物所有者对大地震期间可能倒塌的数千栋建筑物进行翻新。 1980年前建造的非延性混凝土建筑被选为需要特别注意的两种特别脆弱的建筑类型之一。本文介绍了对加利福尼亚州洛杉矶的一栋历史悠久的混凝土建筑进行抗震改造的案例研究。该建筑始建于1916年，最初是Willy's Overland Company汽车经销店和装配厂的所在地，后来变成了Desmond的百货商店仓库。改造后，这座五层楼的仓库将被改造成高品质的创意办公空间，包括一楼的咖啡厅，以及一个7,000平方英尺的第六层，使该建筑的总面积达到82,000平方英尺。改造项目目前正在建设中，预计将在2015年夏季全部使用。完成后，它将是南公园区历史性建筑的许多潜在翻新工程中的第一个，用于创意办公。本案例研究提出了一种创新而严谨的方法，该方法旨在通过不超过2011年《洛杉矶市建筑规范》（2011 LABC）第34章中的重力载荷和横向力变化触发因素而向现有建筑物中添加故事，从而需要进行改造。尽管证明不是代码要求的，但还是进行了地震改造。同时继续确保保留的现有结构构件中力影响的变化不超过规范更新触发器。在评估和翻新设计中考虑了自建筑物最初使用极低强度混凝土建造以来所做的所有结构修改。

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