42 research outputs found
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Performance-Based Seismic Design and Assessment of Bridges
Current trends in the seismic design and assessment of bridges are discussed, with emphasis on two procedures that merit some particular attention, displacement-based procedures and deformation-based procedures. The available performance-based methods for bridges are critically reviewed and a number of critical issues are identified, which arise in all procedures. Then two recently proposed methods are presented in some detail, one based on the direct displacement-based design approach, using equivalent elastic analysis and properly reduced displacement spectra, and one based on the deformation-based approach, which involves a type of partially inelastic response-history analysis for a set of ground motions and wherein pier ductility is included as a design parameter, along with displacement criteria. The current trends in seismic assessment of bridges are then summarised and the more rigorous assessment procedure, i.e. nonlinear dynamic response-history analysis, is used to assess the performance of bridges designed to the previously described procedures. Finally some comments are offered on the feasibility of including such methods in the new generation of bridge codes
Discussion of “Comparison of Base Shears Estimated from Floor Accelerations and Column Shears”
Effect of variation on infill masonry walls in the seismic performance of soft story RC building
Evaluation of three-dimensional modal pushover analysis for unsymmetric-plan buildings subjected to two components of ground motion
Development and Validation of Finite Element Structure-Tuned Liquid Damper System Models
Non-linear seismic analysis and vulnerability evaluation of a masonry building by means of the SAP2000 V.10 code
Evaluation of Assumptions Used in Engineering Practice to Model Buildings Isolated with Triple Pendulum Isolators in SAP2000
Seismic reliability assessment of RC tunnel-form structures with geometric irregularities using a combined system approach
Tunnel-form structures represent a new type of structural systems with enhanced earthquake resistance and
considerably reduced construction times, if compared to conventional reinforced concrete frames and dual
systems. Due to the limited information about the seismic performance of tunnel-form buildings in the presence
of vertical and horizontal irregularities, seismic design standards generally prevent such irregularities and
therefore impose significant architectural limitations. To address this issue, a liability assessment is here conducted
on irregular 5- and 10-storey tunnel-form buildings subjected to 12 different earthquakes, representing a
design spectrum. The structural response of these buildings is obtained under both Design Basis Earthquake
(DBE) and Maximum Considered Earthquake (MCE) hazard levels by using time-history and nonlinear static
(pushover) analyses. The reliability of the buildings is then assessed by using a novel combined system approach,
in which the structural effects of walls and coupling beams at each storey are modeled as series and parallel subsystems.
The results of this study show that, despite the geometric irregularities, all the structural elements could
satisfy the Immediate Occupancy (IO) performance level under both DBE and MCE scenarios with over 95%
reliability. Therefore, enforcing the regularity for tunnel-form structures in current seismic design guidelines
appears to be too conservative; the results of this study can then prove useful for a more efficient design of
irregular tunnel-form structures in seismic regions