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Optimum Damage-Control Policies for Structural Systems under Seismic Risk Conditions

机译：地震风险条件下的结构系统的最佳损伤政策

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Performance-Based Earthquake Engineering (PBEE) aims at producing systems capable of accomplishing previously established performance objectives. Ideally, these objectives should be quantitatively expressed, they should recognize the uncertainties associated with all the agents involved (seismic excitations, structural response and capacity, damage and failure modes and consequences), and they should be referred to the expected life cycles of those systems. They should be optimal in some sense, and their achievement should be pursued by means of a number of engineering processes: design and construction (including quality control), repair and maintenance. The latter should include both preventive policies and specific actions established on the basis of the information provided by health monitoring programs. Devices and methods for active and passive structural control are here considered as elements of the system design: they contribute to determine its seismic response properties. The initial properties of such an engineering system are largely determined by the design criteria, by the construction methods and by the quality control programs. Those properties include the global and local values of strength and stiffness throughout the system, as well as the relative contributions of conventional structural members and passive control elements (energy dissipating devices) to those values. The establishment of structural design criteria for a system and of the repair and maintenance policies to be adopted should be formulated under the same optimization framework, accounting for the increase in vulnerability that may result from damage accumulation. The implementation of these policies is based on the use of information of different nature, coming from different sources. In some cases, damage can be estimated on the basis of the recorded responses of the system to sequences of seismic events. In others, only theoretical estimates may be feasible, taking into account whatever information is available about the probable values of their intensities and of the relevant detailed properties of the ground motion. Significant information can also be extracted from visual inspection, as well as from the records of structural response to micro-tremors and to low amplitude forced vibrations.
机译：基于性能的地震工程（PBEE）旨在生产能够完成以前建立的绩效目标的系统。理想地，这些目标应定量地表示，应该认识到与所涉及的所有试剂（地震激励，结构响应和容量，损坏和失效模式和后果）相关联的不确定性，它们应该被称为这些系统的预期寿命周期。他们应该在某种意义上是最优的，而他们的成就应该由若干工程流程来追求：设计和施工（包括质量控制），维修和保养。后者应包括预防性政策和卫生监测方案提供的信息的基础上建立的具体行动。有源和无源结构控制的装置和方法在此处被视为系统设计的元素：它们有助于确定它的地震响应特性。这样的工程系统的初始特性主要由设计标准来确定，由施工方法和由所述质量控制程序。这些性质包括强度和刚度整个系统的全局和局部值，以及常规的结构构件和被动控制元件（能量耗散设备）的那些值的相对贡献。结构设计标准的系统和维修保养政策，采取建立应在相同的优化框架下制定，占脆弱性的增加可能导致的损伤累积。这些政策的实施是基于使用不同性质的信息，从不同来源。在某些情况下，损坏可以在系统的地震事件序列记录的响应的基础上进行估计。在其他国家，只是理论上的估计可能是可行的，同时考虑到任何已有的信息对他们的强度和地面运动的相关详细属性的可能值。显著信息也可以从视觉检查提取的，以及从微结构震颤响应的记录和到低振幅受迫振动。

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