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.

Evaluation of shear strength of deep beams with stirrups

Abstract: The effectiveness of the shear reinforcement of stirrups in deep beams has yet to be satisfactorily verified. Therefore, in the past, their effectiveness was not considered in the design of reinforced concrete (RC) structures when the shear strength of deep beams was calculated. In this research, model load tests of deep beams with stirrups were performed to examine their shear strength. As a result of the experiments, it was verified that the shear span and the shear reinforcement ratio influence the effectiveness of the shear reinforcement. A method of evaluating shear strength of deep beams with stirrups proposed.

Earthquake Analysis of Arch Dams. I: Dam‐Foundation Interaction

Abstract: A threedimensional boundary element technique for the earthquake analysis of arch dams is presented. The dam and the foundation rock are assumed to be viscoelastic domains, the latter being boundle...

Modeling of Inelastic Behavior of RC Structures under Seismic Loads

Abstract: Proceedings of the U.S.–Japan Seminar on Post-Peak Behavior of Reinforced Concrete Structures Subjected to Seismic Loads: Recent Advances and Challenges on Analysis and Design, held in Tokyo and Lake Yamanaka, Japan, October 25-29, 1999. Sponsored by the National Science Foundation, U.S.A.; Japan Society for the Promotion of Science; Japan Concrete Institute. This collection presents the latest ideas and findings on the inelastic behavior of reinforced concrete (RC) structures from the analysis and design standpoints. These papers discuss state-of-the-art concrete material models and analysis methods that can be used to simulate and understand the inelastic behavior of RC structures, as well as design issues that can improve the seismic performance of these structures. Topics include modeling of concrete behavior; modeling of RC structures (finite element approach and macro-element approach); and experimental studies, analysis, and design issues.

Residual Seismic Performance of Reinforced Concrete Bridge Piers After Moderate Earthquakes

Abstract: Although Korea has long been considered to be free of earthquake hazards, the number of low and moderate earthquakes has increased each year. This study investigates the residual seismic performance of earthquake-damaged reinforced concrete bridge piers that were constructed before or after the implementation of a seismic design code for Korea. Eight circular concrete columns 600 mm (23.6 in.) in diameter and 1500 mm (59.0 in.) in height were constructed with three test parameters: confinement ratio, lap-splice of longitudinal steel, and retrofitting fiber-reinforced polymer (FRP) materials. Reinforced concrete (RC) bridge piers were subjected to artificial earthquake motions using a pseudo-dynamic test (PDT), and then their seismic performance was examined in a quasi-static test (QST). The seismic enhancement of FRP wraps was also investigated. Six specimens were loaded to induce damage by a series of four artificial earthquakes representative of earthquakes in the Korean peninsula. Following the PDT, the six predamaged specimens were subjected to inelastic cyclic loading while under a constant axial load of 10% of the column axial capacity. Two reference specimens without predamage were subjected to similar quasi-static loads. Test results showed that all specimens behaved almost linearly under moderate artificial earthquakes. Except for the ordinary specimens with lap-spliced longitudinal bars, most specimens predamaged during the PDT generally demonstrated good residual seismic performance. The findings also showed that retrofitting RC bridge specimens with fiber composite wraps in the potential plastic hinge region enhanced flexural ductility even for a flexural shear failure mode.

Conceptual Seismic Design of Regular Frames Based on the Concept of Uniform Damage

Abstract: The objective of this study was to propose a seismic design methodology for moment-resisting frames to limit the extent of structural damage and distribute this damage uniformly along the height. This permits the efficient utilization of the energy dissipation capacity of most structural members to avoid undesirable dynamic responses, e.g., the formation of story mechanisms and/or the amplification of story drifts caused by P-delta effect. The proposed methodology is based on the utilization of seismic design lateral load patterns to obtain a uniform distribution of story ductility ratios along the height. It is demonstrated that, on average, frame structures designed based on the proposed approach exhibit a more uniform distribution of story ductility and story drift ratios when compared to the distributions obtained using current U.S. seismic code provisions. Designs based on the proposed approach are expected to provide increased protection against global collapse and loss of life during a strong earthquake event.