• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Structural Engineers Association of California(SEAOC) Convention; 20050928-1001; San Diego,CA(US) >Innovative Base-Isolation Design of an Essential Facility
【24h】

Innovative Base-Isolation Design of an Essential Facility

机译：基本设施的创新基础隔离设计

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A common problem that is encountered in the design of low-rise base-isolated buildings, where the gravity load on the isolators is relatively small, is the resistance to uplift, or net tension, which may be experienced under columns of lateral force-resisting frames. Rubber isolators have fairly low tension stiffness and strength and traditional spherical friction pendulum isolators operate based on contact and thus, have no tension resistance. As a result, most base-isolated buildings require a substantial number of braced frames bays in order to limit the tension demands on the isolators. In response to this concern, an innovative new uplift-prevention friction pendulum isolator, also known as a tension-restraint isolator, has been developed and is comprised of two perpendicular opposing concave rails that are connected such that tension can be transferred through the isolator. This paper describes the design of the Emergency Operation Center for the City of Los Angeles which utilizes tension-restraint friction pendulum isolators under the frame columns and traditional spherical friction pendulum isolators at the non-frame columns. The building is an 82,000 square-foot 2-story essential facility that houses emergency command centers for the City's police and fire departments. A performance-based design approach was utilized for this project in order to satisfy the enhanced seismic performance objectives dictated by the nature of the mission critical functions served by the building. These performance objectives include the following: (1) For a Design-Basis Earthquake (475-yr), the building is expected to be "Fully Operational" and (2) For a Maximum Considered Earthquake (2500-yr), the building is expected to be somewhere between "Life Safe" and "Operational." A three-dimensional computer model of the building was developed utilizing nonlinear elements for the friction pendulum isolators. Time history analyses were performed using seven sets of ground motion records for each level of seismic hazard and the sensitivity of the building response was investigated for the following parameters: (1) center of mass location, (2) orientation of the ground motion, and (3) isolator friction properties. The use of the tension-restraint friction pendulum isolators was beneficial to the project because it minimized the number of the braces required in the superstructure. The reduction in braces also afforded considerable architectural flexibility and minimized the impact on the functional layout of the building.
机译：在低层基础隔离建筑物的设计中遇到的一个常见问题是，隔离器上的重力载荷相对较小，这是在抗侧向力柱下可能会遇到的抗拉力或净拉力框架。橡胶隔离器具有相当低的拉伸刚度和强度，传统的球形摩擦摆式隔离器基于接触进行操作，因此没有抗拉性。结果，大多数基础隔离的建筑物都需要大量的支撑框架托架，以限制隔离器的拉力要求。针对这种担忧，已开发出一种创新的新型防抬起摩擦摆式隔离器，也称为张力约束隔离器，它由两个垂直相对的凹形导轨组成，两个垂直的相对凹形导轨连接在一起，从而可以通过隔离器传递张力。本文介绍了洛杉矶市紧急行动中心的设计，该中心在框架柱下使用张力约束摩擦摆式隔离器，在非框架柱上使用传统的球形摩擦摆式隔离器。该建筑是一个占地82,000平方英尺的2层重要设施，里面装有纽约市警察和消防部门的紧急指挥中心。此项目采用基于性能的设计方法，以满足建筑物所执行的关键任务功能的性质所指示的增强的抗震性能目标。这些性能目标包括：（1）对于设计基准地震（475年），预计该建筑物为“完全运行”；（2）对于最大考虑地震（2500年），该建筑物为预计介于“生命安全”和“运营”之间。利用摩擦摆式隔振器的非线性元件开发了建筑物的三维计算机模型。使用七组地面运动记录针对地震灾害的每个级别进行了时程分析，并针对以下参数研究了建筑物响应的灵敏度：（1）重心位置，（2）地面运动的方向和（3）隔离器的摩擦性能。张力约束摩擦摆式隔离器的使用对项目有益，因为它使上部结构中所需的撑杆数量最少。撑杆的减少还提供了相当大的建筑灵活性，并将对建筑物功能布局的影响降至最低。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号