The portland bridges that will collapse in an earthquake. Earthquake resistant or aseismic structures are designed to protect buildings to some or greater extent from earthquakes. This projects deals with an earthquake resistant s bridge. Lets take a look at some of the earthquake resistant techniques used by the engineers world over to minimize the damage to structures due to earthquakes floating foundation. The unsupported length of a wall between cross walls should not exceed 10 times the wall thickness, with a maximum of 7 m. Benefits of inclined pile foundations in earthquake. K singh hemant kumar 8200903 associate professor mujahid. However, the way this is done currently, the bridges become permanently damaged and cannot carry traffic anymore after the earthquake. Dampers can also be used to retrofit older buildings that might not have been designed as earthquake resistant structures. Request pdf benefits of inclined pile foundations in earthquake resistant design of bridges this paper studies the effects of the use of inclined pile foundations on the seismic response of. Strong, elastic smart materials aid design of earthquake. Factors that affect a structures seismic risk include. Well, everyone knows about the earthquake and an earthquake is an oscillation or the quivering.
There are many known and practiced measures to protect against seismic threats. In few cases the earthquake is fierce to the surface of the earth which delivers the energy in the crust of the earth, coming to the released energy then it is a quick and unexpected displacement of the parts of the crust. Engineering connections earthquake proof bridge science documentary reel truth science duration. Strong, elastic smart materials aid design of earthquakeresistant bridges 28 august 20, by misha raffiee traditional bridge columns are constructed from. In these tests, bridge columns built using memoryretaining nickeltitanium rods and flexible concrete composite returned to their original shape with an earthquake equal to 7. Closely spaced horizontal hoops, restraining the main vertical reinforcement bars of the substructure, are effectively used for this purpose. Apart form obviating the necessity of providing seismic restrainers andor wide support lengths for the. Design of earthquake resistant building project report 1. New bridge design improves earthquake resistance, reduces. A study on earthquake resistant construction techniques mohammad adil dar1, prof dr a.
You can never make something earthquake proof, but there are many things that can be done to resist earthquakes. How each of portlands bridges would fare in an earthquake. Reel truth science documentaries 1,718,310 views 49. The building and all its equipment and contents remained fully operational after the earthquake. For example, the akashi kaikyo bridge in japan is currently the longest span bridge in the world and is in a severe seismic zone. Hence, despite the great improvements recently made in modular bridge construction, a large amount of concrete is still cast in place to properly splice the reinforcements between the segments.
There duceddegree of indeterminacy of bridge structure stored used potential. Tegos2 1egnatia odos sa 2auth abstract the design of structural systems depends on a wide range of compliance criteria which are related to safety, functionality, economy, aesthetics, durability. There are longspan bridges built in earthquake zones. The problem of minimum cost for structural members of earthquake resistant bridges e. A stateoftheart text on earthquake proof design and retrofit of bridges. Afterward, each fuse section will be replaced and the hinge pipe beams will be ready to steady the bridge during the next earthquake. Engineers did not design bridges for major earthquake until the mid1990s. Design of earthquake resistant building project report. Earthquakeresistant bridge thanks to new flexible materials. Earthquake resistance techniques to protect against.
Earthquake resistant building construction seminar and ppt with pdf report. This document is intended to provide guidance for earthquake resistant design of routine retaining. New bridge design improves earthquake resistance, reduces damage and speeds construction june 30, 2014 this graphic illustrates a new design for the framework of columns and beams that support bridges, called bents, to improve performance for better resistance to earthquakes, less damage and faster onsite construction. The building is located 8 miles from the epicenter of the magnitude 6. The rcc design of superstructure is calculate by manual calculation and analysisby using staad. The objective is to build a small bridge from balsa wood that can withstand severe ground shaking recorded during actual earthquakes. Earthquakeresistant construction, the fabrication of a building or structure that is able to withstand the sudden ground shaking that is characteristic of earthquakes, thereby minimizing structural damage and human deaths and injuries. Techniques for earthquake resistant design of structures. Design of earthquake resistant bridges using rocking columns. Earthquakeresistant structures features seismic design and retrofitting techniques for low and high raise buildings, single and multispan bridges, dams and nuclear facilities. Tata cara perencanaan ketahanan gempa untuk jembatan jalan raya. Earthquake resistant bridge design competition goal and objective the goal of this project is to use basic engineering concepts to design and build a bridge that can resist the forces induced during an earthquake. Seismic design and retrofit of bridges fills the urgent need for a comprehensive and uptodate text on seismically resistant bridge design. Closely spaced horizontal hoops, restraining the main vertical reinforcement bars.
Earthquakes have caused numerous bridge collapses including in the u. Plastic hinging and durability there is a difference in seismic design aspects of bridges and buildings. Pdf earthquake resistant design standards for bridges. Smart materials improve earthquakeresistant bridge design. Earthquake resistant foundation design page 2 contents 4 4.
Since earthquakes release energy that pushes on a building from one direction, the strategy is. Spm022 third edition, amendment 2 effective from may 2016. Why its impossible to engineer earthquake proof buildings we the curious duration. While no structure can be entirely immune to damage from earthquakes, the goal of earthquake resistant construction is to erect structures that fare better during seismic activity than their conventional counterparts. The problem of minimum cost for structural members of. Dampers are like large shock absorbers used in cars, helping dissipate the energy generated during an earthquake thereby keeping the larger structure on top safe what kinds of buildings use it.
Department of homeland security by the national institute of building sciences building seismic safety council. Design of bridges for earthquake resistance is the first guide to focus specifically on en 19982 eurocode 8. Earthquakeresistant construction of adobe buildings. It is not intended to provide a fully comprehensive treatment of all aspects of retaining structure design and construction. How each of portlands bridges would fare in an earthquake would like to send you push notifications about the latest news and weather. As a result, following a strong earthquake, the bridge would remain open to emergency vehicles and other traffic. How can large bridges be made resistant to earthquakes. For the most part, the earthquake resistant bridge consists of the same materials many bridges are made of. Newer bridges, like the tilikum crossing over the willamette river, must be built to tougher standards. Earthquake resistant building construction pdf and ppt. Suitable construction methods are required to ensure that proper design objectives for earthquake resistance are met.
The author also compares and contrasts various seismic resistant techniques in usa, russia, japan, turkey, india. Part 2 bridges, the design standard for use in the seismic design of bridges in which horizontal seismic actions are mainly resisted through bending of the piers or at the abutments, however it can also. A study on earthquake resistant construction techniques. Saiid saiidi, civil engineering professor and researcher at the university of nevada reno, us, has tested new materials that can bend to build an earthquake resistant bridge that also remains usable. Strong, elastic smart materials aid design of earthquake resistant bridges more information. Earthquake resistant bridges are designed such that the columns are monolithically connected to the girder and the foundations. He is a chartered structural engineer from the institution of structural engineers. The wall height should not exceed eight times the wall thickness at its base, and in any case should not be greater than 3. Integral bridges can be made earthquake resistant more conveniently than bridges with bearings. For nearly 16 years, saiidi has kept busy inside the universitys earthquake engineering lab, testing a new kind of bridge that uses materials outside the typical steel and concrete. Blast and earthquake resistant bridge pier concept. An introduction to the nehrp recommended seismic provisions for new buildings and other structures. To design an earthquake proof building, engineers need to reinforce the structure and counteract an earthquake s forces. How earthquakeproof buildings are designed bigrentz.