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.

Application of Functional Bearing System to the Seismic Retrofit of Bridge

Abstract: Investigations on the 1999 Taiwan Chi-Chi earthquake indicate that most of the bridge columns experienced none to-minor damages except for those bridges directly crossed by the ruptured faults. Studies show that the functions of the bearing system, including non-bolted rubber bearings, shear keys and restrainers, plays an important role for the performance of the bridges during the earthquake. One of the reasons for this unexpected performance is the way of bridge bearing construction in Taiwan. CECI Engineering Consultants Inc. cooperated with NCREE(National Center for Research on Earthquake Engineering) to conduct 3 years research in CECI annual R&D plan. This presentation will show the difference of bridge damages due to earthquake in USA, Japan and Taiwan first, then present seismic retrofit methods will be braught up. Meanwhile, unlike traditional retrofit emphasizing on column ductility, a new retrofit tool named “functional bearing” aiming at the effect of bridge bearing systems is introduced. At the second half, results of experimental studies on rubber bearing mechanism is quoted from annual R&D project. The experimental results explain the special bridge damage patterns in Chi-Chi EQ. In addition, the research will develop new design methodologies to provide sufficient capacity on the existing or new design bridge, and the damage level should be limited by using “functional bearing” mechanism.

Seismic Evaluation and Retrofit of Deteriorated Concrete Bridge Components

Abstract: Corrosion of steel bars in reinforced concrete structures is a major durability problem for bridges constructed in New York State (NYS). The heavy use of deicing salt compounds this problem. Corrosion of steel bars results in loss of steel cross section, deterioration of bond between concrete and reinforcing bars, and more importantly, in most cases, it results in unsymmetrical concrete sections that are susceptible to shear stresses produced by torsion. Though earthquake frequency of occurrence and expected ground accelerations in NYS is less than in western states, the potential for earthquake damage in or around NYS is still very real. Given the level of deterioration in many reinforced concrete bridges in NYS, they are considered very vulnerable to major damage during a moderate seismic event. There is an urgent need for proper guidance for evaluation of deteriorated reinforced concrete bridge components that could assist structural engineers in estimating the reserved strength of deteriorated bridges and designing cost-effective methods for retrofit. Proper evaluation and retrofit of existing deteriorated reinforced concrete bridges will limit the collapse of bridges during moderate seismic events in NYS and the surrounding states, and consequently save people’s lives. The findings of this investigation suggest the need for seismic retrofit of deteriorated reinforced concrete bridge columns, particularly those with corroded lap splice in longitudinal reinforcement. The study also suggests the need for retrofit of corroded pedestals over piers and abutments, as they may cause sudden unseating of girders.

A New Approach in Equivalent Spring-Dashpot Method for Seismic Soil-Structure Interaction Analysis of Long Bridges Including Non-uniform Excitations

Abstract: This paper is conducted on evaluating the seismic responses of long bridges under the effect of the soil-structure interaction (SSI) and spatially varying earthquake ground motions (SVEGM). The commonly used spring-dashpot method for analysis of the pile-supported structures under the effect of (SSI) improves to a more capable model. Also, a comprehensive investigation of the dynamic response of a long bridge subjected to spatially varying earthquake ground motions (SVEGM) is performed based on a proposed analytical model which includes the effect of (SSI). The modeling methodology is discussed in detail. To emphasize the importance of the SVEGM and SSI, bridge responses are also determined for the uniform ground motion and fixed base cases. This study proposing a compatible analytical model concerns the relative importance of the SSI and SVEGM and shows that these effects cannot be neglected in seismic analysis and design of long bridges.

Analisis Perbandingan Simpangan Lateral Bangunan Tinggi dengan Variasi Bentuk dan Posisi Dinding Geser. Studi Kasus: Proyek Apartemen The Royale Springhill Residences

Abstract: A building should at least be able to bear the loads that work on the structure . Lateral loads such as wind loads and seismic loads that can cause lateral deflection and gravity loads including dead load and live load. The higher the building , the lateral deflection occurs also greater in atas. Structure Engingeer planners are required to better understand the design of earthquake resistant structures that are not just simply follow in designing the building , but must comply with the Earthquake Resilience Planning Procedures for Building a goal is for earthquake resistance of building structures are planned to function properly in designing a building structure must be considered rigidity , stability of the structure withstand any loading imposed on them and how the behavior of the structure to withstand such loads . ETABS is a 3D Extended program of Building Systems of Computer and Structure inc that use the Windows operating system . The use of simulation program ETABS memperlihat pattern collapse was going to happen so it can be input for the planning and construction of high-rise buildings better . In this study will be compared to the horizontal deflection obtained from the comparison position and shape shear walls . Results from this research is a comparison of deflection that occurs , a review of the limits of serviceability and ultimate limit each building models to be compared .