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 internally damped shearbeam model to analysis of buildings under earthquakes : Robust procedure for quick evaluation of seismic performance

Abstract: A step-by-step procedure for linear analysis of building structures with rigid floor beams is developed and presented. The method outputs the maximum story drift envelope, and consists of a series of explicit formulas that do not require iteration. The basis of the method is an internally damped shearbeam model. Drift demand spectra are used to provide information on the ground motion hazard of the site. In addition to the drift demand spectra, two additional spectra are incorporated, which describe the higher mode behavior. To test accuracy, three sample buildings structures (3-, 9-, and 20-story buildings at Los Angeles) are analyzed for five sample earthquake records using the proposed procedure, and conventional time history analysis. A comparison of the results shows that the proposed procedure is accurate enough for quick evaluation of seismic performance.

Composite materials for rehabilitation of civil structures and seismic applications

Abstract: The TYFO Fibrwrap System was conceived in 1988 as an attractive alternative to conventional steel jackets used to reinforce concrete bridge columns The System has undergone numerous structural tests to validate its use in providing ductility and shear strengthening to various structural elements Resulting from the extensive testing has been approval of the Fibrwrap System by the City of Los Angeles and the California Department of Transportation for its use in seismic retrofit applications Since its inception, the Fibrwrap System has been successfully installed on over 3500 structural elements worldwide, including two structures which performed as designed and withstood the 1997 Northridge Earthquake The System is currently used to strengthen columns, slabs, beams, and walls to improve seismic performance and load carrying capacity

Design And Analysis Of Base Isolated Structures

Abstract: Development in the design of earthquake resistant buildings has been growing since about 100 years ago. In the design of earthquake resistant buildings, the main aspects to consider are life safety and damage reduction on architectural element caused by the earthquake. However, with the development of age, modern buildings contain sensitive and expensive equipment that become vital for business, commercial, education and healthcare. Hence, the equipment inside the building needs to be protected when the earthquake occurs. The basic principle of a base isolation system is to provide flexibility in the building and at the same time provide damping to prevent amplification caused by the earthquake. By placing structure on the base isolation system, it will prevent horizontal movement of the ground transferred to the structure and produce a significant reduction in the acceleration of the earthquake. This paper explains about the design and analysis of a base isolated structure. The base isolation system used is Lead Rubber Bearings, High Damping Rubber Bearings, and a combination of those two bearings on a 20-story building. The main focus of this paper is the comparison of the response between a fixed base structure and the base isolated structure and the comparison of the response generated by each type of base isolation system. The compared responses are the natural vibration period, the base shear, and the base isolation hysteretic curve. The design procedure used is based on SNI 1726-2012. The conclusion of this paper is the effectiveness of a base isolated structure is based on the generated response.

Practical problems and costs of fabricating multistory models

Abstract: ONE OF THE FUNCTIONS OF THE CANADA EMERGENCY MEASURES ORGANIZATION IS TO REDUCE THE VULNERABILITY OF NORMAL BUILDINGS TO A VARIETY OF DYNAMIC LOADS, INCLUDING BLAST AND EARTHQUAKE. PART 1 OF THIS PAPER DESCRIBES THE PRODUCTION OF EIGHT SMALL STRUCTURES EACH WITH SEVEN STORIES AND 15 COLUMNS PER FLOOR. FOUR OF THE SEVEN-STORY MODELS HAVE BEEN DESIGNED IN ACCORDANCE WITH NORMAL STRUCTURAL ENGINEERING PRACTICE FOR DEAD LOAD, LIVE LOAD AND WIND, WHILE THE OTHER FOUR HAVE BEEN DESIGNED IN ACCORDANCE WITH THE NATIONAL BUILDING CODE (1965) REQUIREMENTS FOR EARTHQUAKE ZONE 3. THIS PAPER DISCUSSED SOME OF THE MAJOR PROBLEMS INVOLVED IN THE PLANNING PROCESS AND SPECIAL EQUIPMENT AND TECHNIQUES WHICH WERE DEVISED TO ALLOW MASS PRODUCTION OF THE 840-COLUMN CAGES AND THE 56 SETS OF SLAB REINFORCEMENT. THE DEVELOPMENT OF CASTING TECHNIQUES AND THE EVOLUTION OF FORMING TECHNIQUES ARE ALSO OUTLINED. PART 2 OF THIS PAPER DESCRIBES TECHNIQUES WHICH HAVE BEEN DEVELOPED FOR MASS PRODUCTION OF SMALL-SCALE SHEAR-WALL BUILDING MODELS USING MORTAR. IT INCLUDES A DESCRIPTION OF THE MORTAR WHICH WAS DESIGNED TO MINIMIZE SHRINKING AND TO OPTIMIZE PLACING AND CURING CONDITIONS, AS WELL AS A DESCRIPTION OF THE REUSABLE PLYWOOD FORMS WHICH WERE DEVELOPED FOR THE EXPERIMENT. THE MODELS ARE APPROXIMATELY 8 FT HIGH AND HAVE WALL THICKNESSES OF 1/2 INCH. THE PAPER ALSO INCLUDES A DISCUSSION OF THE TECHNIQUES USED IN MOUNTING THE MODEL ON A FIXED BASE AND ON ATTACHING LOADING DEVICES. /ACI/