seismic design of structures.

CIVILPRINCESS · 2010-02-02T23:42:58+00:00

Buildings are the Worst Killers than the Earthquake. Earthquakes don’t kill; badly built houses do. Neglecting earthquake hazards in the design of buildings will not be fair designing. I got to present a paper on the seismic design of structures.and I thought it would be nice to share it with all CEans.but i am not master at this and am trying to post the little that i know. so I will update this thread on the seismic design of structures. The most extensively discussed among the seismic resistant construction are the new methods like rubber bearings, base insulation, seismic dampers, and energy dissipation devices. In certain hilly areas there were many traditional methods of construction which could allow the buildings to withstand the high intensities of earthquakes for more than 500 years. in this thread I shall brief you all about the various modern methods of seismic design and shall give you a glimpse into the traditional methodologies that were used to protect the houses from these earthquakes. P.S: updates can be from your side too 😁

seismic design of structures.

CIVILPRINCESS

Member

Updated: Oct 26, 2024

Views: 1.4K

Buildings are the Worst Killers than the Earthquake. Earthquakes don’t kill; badly built houses do. Neglecting earthquake hazards in the design of buildings will not be fair designing.

I got to present a paper on the seismic design of structures.and I thought it would be nice to share it with all CEans.but i am not master at this and am trying to post the little that i know. so I will update this thread on the seismic design of structures.

The most extensively discussed among the seismic resistant construction are the new methods like rubber bearings, base insulation, seismic dampers, and energy dissipation devices. In certain hilly areas there were many traditional methods of construction which could allow the buildings to withstand the high intensities of earthquakes for more than 500 years.

in this thread I shall brief you all about the various modern methods of seismic design and shall give you a glimpse into the traditional methodologies that were used to protect the houses from these earthquakes.

P.S: updates can be from your side too 😁

0

Replies

Howdy guest!

Dear guest, you must be logged-in to participate on CrazyEngineers. We would love to have you as a member of our community. Consider creating an account or login.

Replies

CIVILPRINCESS

Member • Feb 4, 2010

When we speak of seismic design of structures, we mostly speak of the modern methods.
Two basic technologies are used to protect buildings from damaging earthquake effects. These are Base Isolation Devices and Seismic Dampers.

let us have a detailed idea about the base isolators first.

BASE ISOLATION:
The idea behind base isolation is to detach (isolate) the building from the ground in such a way that earthquake motions are not transmitted up through the building or at least greatly reduced. A base isolated structure is supported by a series of bearing pads, which are placed between the buildings and building foundation. The bearing is very stiff and strong in the vertical direction, but flexible in the horizontal direction.

the closer look at the rubber bearings will be as follows:

A lead–rubber bearing is made from layers of rubber sandwiched together with layers of steel. In the middle of the bearing is a solid lead "plug." On top and bottom, the bearing is fitted with steel plates which are used to attach the bearing to the building and foundation. The bearing is very stiff and strong in the vertical direction, but flexible in the horizontal direction.

in the next post i will brief you about the spherical isolating system.

Are you sure? This action cannot be undone.
Cancel
NKuzmick

Member • Aug 18, 2010

This is a great post on the usefulness of rubber bearings in building safety design - I thought I'd give it a bump.

I also recently came across some good literature about this topic courtesy of #-Link-Snipped-#

In issue 13 of their natuurrubber publication from 1999 they discuss the uses of natural rubber in building design in depth - it's a pretty informative article

To find the article online go to the newsletter tab and click on #13 - that will load the PDF of the newsletter.

Cheers

Nick Kuzmick
Timco Rubber Products
<a href="https://www.timcorubber.com/" target="_blank" rel="nofollow noopener noreferrer">Custom Rubber Products & Parts Supplier | Timco Rubber</a>
#-Link-Snipped-#

Are you sure? This action cannot be undone.
Cancel
theconstructor

Member • Sep 16, 2010

I have got something to share. visit #-Link-Snipped-# for earthquake related design guide. there is nothing complicated there, just small things that we should keep in mind while designing a building so that it does not collapse during earthquake..

I hope you will find it useful.

Are you sure? This action cannot be undone.
Cancel
CIVILPRINCESS

Member • Sep 17, 2010

Spherical Sliding Isolation Systems

Spherical Sliding Isolation Systems are another type of base isolation. The building is supported by bearing pads that have a curved surface and low friction.
During an earthquake, the building is free to slide on the bearings. Since the bearings have a curved surface, the building slides both horizontally and vertically. The force needed to move the building upwards limits the horizontal or lateral forces which would otherwise cause building deformations. Also, by adjusting the radius of the bearing's curved surface, this property can be used to design bearings that also lengthen the building's period of vibration.

the following is a picture of spherical isolating structure :

Are you sure? This action cannot be undone.
Cancel
gohm

Member • Sep 17, 2010

What are the pros & cons of the two systems discussed so far and what applications are they best suited for in building design?

Are you sure? This action cannot be undone.
Cancel
CIVILPRINCESS

Member • Sep 18, 2010

though both these satisfy the need, people mostly use only lead rubber bearing in practical application since it is cheap and also easily fixed. but the only disadvantage of lead rubber bearings is that the middle layer of lead gets damaged after some quakes. so it will require maintenance.

Are you sure? This action cannot be undone.
Cancel
maria flor

Member • Dec 24, 2010

I'm a 3rd yr. civil engineering student. I just want to ask what is the difference between a roller or hinge and how can we create a roller or hinge in actual.

Are you sure? This action cannot be undone.
Cancel
CIVILPRINCESS

Member • Mar 16, 2011

hinge is actually a type of connection in the beams and structures that restrict movement right? the rollers support but they allow movement. that the difference i guess. 😀

Are you sure? This action cannot be undone.
Cancel
maria flor

Member • Mar 17, 2011

Do rollers really gives freedom to columns and beams to expand and contract during hot or cold temperature???

Are you sure? This action cannot be undone.
Cancel
maria flor

Member • Mar 17, 2011

What is this energy dissipation devices???

Are you sure? This action cannot be undone.
Cancel
Nachko

Member • May 14, 2012

Only hinges here. I have made these photos in Budapest, Amsterdam and Berlin.
And yes, rollers really allow expansion and contraction 😀

Oops! On the fifth photo from the top you can see a kind of a roller - a thick lead plate that allows side movement - not too big, but enough to be considered a "roller" type. The lead plates are old fashion, now polymers or real rollers are used.

Are you sure? This action cannot be undone.
Cancel
Prerna Singh

Member • Jun 3, 2012

the traditional methods discussed include one of the structure called the KOTI BANAL in uttarakhand.these structures are standing for the past 500 years n are made using timber n stone rubble masonry.....

Are you sure? This action cannot be undone.
Cancel
Kaustubh Katdare

Administrator • Jun 3, 2012

Interesting - what makes these houses so strong?

Are you sure? This action cannot be undone.
Cancel