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首页> 外文会议>Triannual international conference on ports >Anticipated Changes to Los Angeles Building Code Due to IBC 2012: Impact on the Seismic Design of Building Foundations on Liquefiable Soils at the Port of Los Angeles
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Anticipated Changes to Los Angeles Building Code Due to IBC 2012: Impact on the Seismic Design of Building Foundations on Liquefiable Soils at the Port of Los Angeles

机译：预期由于IBC 2012而导致的洛杉矶建筑法规变更：对洛杉矶港可液化土壤上建筑地基的抗震设计的影响

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The 2009 International Building Code (IBC 2009) for the seismic design of building structures specifies the use of the Design Earthquake (DE) ground motion for most structural and geotechnical evaluations. However, the revised IBC 2012 specifies the use of increased ground motion requirements for liquefaction-related geotechnical evaluations based on the Maximum Considered Earthquake (MCE) rather than DE. This change will result in a 150 percent increase in the ground motion, since MCE is equivalent to 150 percent of the DE. As the IBC 2012 requirements will be adopted by the California Building Code, which in turn will be reflected in the City of Los Angeles Building Code, the revised IBC 2012 requirements may significantly impact the design of waterfront building structures at the Port of Los Angeles (POLA) built near dikes or slopes where liquefiable soils are present because of larger lateral spreading deformations. However, the new requirements will have minimal impact on building structures constructed on level ground since lateral ground deformation is not generally an issue for level-ground conditions. To illustrate the impact of the new IBC 2012 requirements, two dike configurations at the POLA, existing and new, were considered in a study commissioned by the POLA. The study concluded that lateral dike and slope deformations for the two dike configurations using site specific MCE ground motions developed per IBC 2012 requirements are expected to be about 200 percent to 400 percent of those estimated using the IBC 2009 requirements. New building construction at port and harbor facilities may require increased costs related to ground improvements to mitigate the increase in slope deformations. Similar to new construction, upgrades, repairs, and retrofits for existing structures may also require increased costs related to ground improvements and may result in structure replacements due to excessive ground movements under MCE. In this paper, background to the IBC 2009 liquefaction evaluation requirements and revisions incorporated in IBC 2012 are described together with impact case studies conducted for the POLA. Geotechnical and structural analyses for two of the case studies are then discussed to illustrate the impacts.
机译：针对建筑结构抗震设计的2009年国际建筑规范（IBC 2009）规定，大多数结构和岩土评估均使用设计地震（DE）地震动。但是，修订后的IBC 2012规定，在基于最大考虑地震（MCE）而非DE的基础上，将增加的地面运动要求用于与液化相关的岩土工程评估。这种变化将使地面运动增加150％，因为MCE相当于DE的150％。由于IBC 2012的要求将由《加州建筑规范》采用，而《加州建筑规范》又将反映在《洛杉矶市建筑规范》中，因此修订后的IBC 2012要求可能会严重影响洛杉矶港海滨建筑结构的设计（ POLA）建在堤坝或斜坡附近，由于较大的横向扩展变形而存在可液化土壤。但是，新要求对在水平地面上建造的建筑结构的影响最小，因为水平地面条件通常不会引起横向地面变形。为了说明新的IBC 2012要求的影响，在POLA委托进行的一项研究中，考虑了POLA的两种堤防配置（现有的和新的）。研究得出的结论是，根据IBC 2012要求开发的使用特定场地MCE地面运动的两种堤防配置的横向堤防和坡度变形，预计将是使用IBC 2009要求估算的横向堤防和坡度变形的200％至400％。港口和港口设施的新建筑可能需要增加与地面改良有关的成本，以减轻边坡变形的增加。与新建筑类似，对现有结构进行升级，维修和翻新可能还需要增加与地面改善有关的成本，并且可能会由于MCE下过多的地面移动而导致结构更换。本文介绍了IBC 2009液化评估要求和IBC 2012中纳入的修订的背景，以及针对POLA进行的影响案例研究。然后讨论了两个案例研究的岩土和结构分析，以说明影响。

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