Earthquake resistant structures

About: Earthquake resistant structures is a research topic. Over the lifetime, 1126 publications have been published within this topic receiving 27467 citations.

Seismic studies of the articulation for the dumbarton bridge replacement structure. volume 2. numerical studies of steel and concrete girder alternates

Abstract: The influences of various girder types and joint articulations on the seismic responses of long multi-span highway bridges are reported. The girder types are of cast-in-place and precast concrete constructions and steel twin-box sections. Various types of expansion joints and girder to pier-cap connections are considered. A 7400 feet long bridge, that is to cross the lower arm of San Francisco Bay, is studied. The bridge is composed of 43 spans founded on various soil conditions, including Thick-Mud and Deep-Water sections. Response characteristics are determined for light, moderate, and severe ground motions of both sections. Time-history and spectral analyses based on design and response spectra are performed for two- and three-dimensional models. Interactions of water mass, soils, footings, and piling groups are considered. Volume 2 considers the following topics: Numerical results for the effects of longtiudinal and vertical ground motions; and Numerical results for the effects of transverse ground motions.

Evaluation of energy absorption characteristics of highway bridges under seismic conditions. volume ii. appendices

Abstract: Modern seismic design provisions for highway bridges rely on the energy-absorption capabilities of the ductile components and the ability of the overall system to dynamically respond so the ductile components can absorb energy. In the absence of physical data on the dynamic response of highway bridges, obtained either by physical tests or from actual earthquakes, bridge engineers must resort to analytical means to assess the dynamic response characteristics of bridges. Analytical procedures, which are developed herein for evaluating the energy-absorption characteristics of highway bridges, are incorporated into a new version (NEABS-II) of the computer program NEABS (Nonlinear Earthquake Analysis of Bridge Systems). A nonlinear beam-column element is developed for reinforced concrete bridge columns that has kinematic hardening, which permits the yield surface to translate in a force-space without changing size or shape. A gapped tension-compression, tie-bar element having bilinear force-displacement relationships was developed for the NEABS-II nonlinear expansion-joint element. Case studies are conducted with NEABS-II on three actual bridges having distinctly different dynamic response and energy-absorbing characteristics.

Performance and Analysis of Arifiye Overpass Reinforced Earth Walls During the 1999 Kocaeli (Turkey) Earthquake

Abstract: This chapter describes how, following the August 1999 earthquake in Kocaeli, Turkey, which had a 7.4 magnitude, the authors performed field investigation in the affected area in order to document the performance of improved soil sites and mechanically stabilized embankments. The seismic performance of a pair of conventional reinforced earth walls that were constructed of steel strips and compacted granular backfill is also described. The walls performed well and suffered only minor damage, despite being subjected to sever ground shaking and large ground displacements. Static and dynamic numerical analyses were performed to investigate the factors that contributed to this performance. The analyses were successful in predicting the observed wall behavior. The results suggest that conventionally designed reinforced earth walls perform relatively well during strong ground shaking and that displacement may be the controlling criterion as opposed to shear failure or collapse.