Abstract
To solve the conservatism of acceptance criteria in ASCE/SEI 41 provisions, a new concept of component performance is put forward and an alternative method based on the statistical distribution of component performance levels to evaluate structural performance level is proposed. Independent component performance levels are redefined in detail and component performance indicator limits are developed, which are different from acceptance criteria for integral target performance level of entire building proposed by ASCE standards. Structural components are classified into critical components and general components. The relationship between structural performance levels and the statistical distribution of component performance levels, including performance levels of critical components, general components and non-structural components, is proposed. A framework for applying this method will be discussed in detailand implemented to a seven-story moment frame. It is concluded that this new evaluation method is simple and meaningful for performance-based seismic assessment and design.
Highlights
From authors’ point of view, authors [20 - 26] have put forward a new concept of component performance levels and redefined them based on the damage degree of component itself and developed basic deformation limits for RC members of moment frames for these Component Performance Levels (CPLs) of new concept, which are similar to the acceptance criteria of RC members in ASCE/SEI 41
Seismic Evaluation of Moment frame with Infill Masonry Walls Modeled as Dead Loads, MF1 The elasto-plastic analysis of MF1 has been conducted and statistic distributions of CPLs of general components and critical components are presented in Table 8 and Table 9 respectively
This paper presents a new method for performance-based seismic assessment based on statistic distribution of component damage
Summary
Development of Performance-Based Seismic Assessment and Design (PBSAD) Since the 1990s, performance-based seismic engineering concepts and approaches have been developed by a series of documents including SEAOC version 2000 Report [1], ATC 40 Report [2], FEMA Report [3] and its companion documents the FEMA [4], FEMA 356 Report [5], FEMA 343 Report [6], ASCE/SEI 31-03 standard [7], ASCE/SEI 41-06 standard [8] and its Supplement 1 [9], and the latest Edition of ASCE/SEI 41 [10] published in 2013 and many other important reports These documents 1) outlined the initial concept of performance levels related to vulnerability and varied levels of seismic hazard; 2) introduced the concept of performance in terms of discretely defined performance levels with names intended to connote the expected level of damage: Collapse, Collapse Prevention, Life Safety, Immediate Occupancy, and Operational Performance, performance objectives were developed by linking one of these performance levels to a specific level of earthquake hazard; and 3) introduced the concept of performance related to damage of both structural and non-structural components. Rather than using discrete performance states like that used in ASCE/SEI 41 methodology, the FEMA P-58 methodology characterizes performance in the form of loss distributions, from which the probability of incurring earthquake impacts, exceeding various levels can be directly obtained
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