首页 | 本学科首页   官方微博 | 高级检索  
     


Direct loss model for seismically damaged structures
Authors:John B. Mander  Jyotirmoy Sircar  Ivan Damnjanovic
Affiliation:1. Zachry Department of Civil Engineering, Texas A&M University, , College Station, TX, 77843‐3136 USA;2. Texas Transportation Institute, Texas A&M University, , College Station, TX, 77843‐3136 USA
Abstract:Loss ratio, which is the ratio of the repair cost to the total replacement cost, is an effective parameter for representing structural and nonstructural damage caused by earthquakes. A probabilistic loss estimation framework is first presented that directly relates hazard to response and hence to losses. A key feature of the loss estimation approach is the determination of losses without need for customary fragility curves. Relationships between intensity measures and engineering demand parameters are used to define the demand model. An empirically calibrated loss model in the form of a power curve with upper and lower cut‐offs is used in conjunction with the demand model to estimate loss ratios. Loss ratios for each of the damage states take into account epistemic uncertainty and an effect on price surge following a major hazardous event. The loss model is calibrated and validated for bridges designed based on the prevailing Caltrans, Japan, and New Zealand standards. The loss model is then transformed to provide a composite seismic hazard–loss relationship that is used to estimate the expected annual loss for structures. The closed‐form four‐step stochastic loss estimation model is applied to the bridges designed for ductility. Results of these ductile designs are compared to a bridge detailed to an emerging damage avoidance design philosophy. Copyright © 2011 John Wiley & Sons, Ltd.
Keywords:damage state  fragility curve  interstory drift  loss ratio  power curve  seismic loss modeling
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号