7/30/2019 Sis Mor Resistent e

http://slidepdf.com/reader/full/sis-mor-resistent-e 1/2

LIST OF MAJOR EARTHQUAKES

In Peru there have been major earthquakes that have cost the lives of thousands of people and

millions in losses. These have led to continued research of earthquakes and their scope in the

Peruvian engineering. A clear example is the constant review and change of the standard

seismic over the years.

As a first major earthquake in Peru could mention, it was occurred on October 17, 1970 in the

department of Ancash, in the north of the country. The magnitude recorded was 7.8. Given the

high vulnerability of the area, there were more than 50,000 deaths and cities were destroyed.

The vast majority of these victims were the result of a flood that buried the town of Yungay.

Four years later, there was another important magnitude earthquake (Ms = 7.5) that struck the

city of Lima on October 3. Many were quantified damage.

On 23 June 2001, an earthquake of great magnitude (Mw = 8.4) in southern Peru, which left a

toll of 100 people dead and destroyed numerous structures. This earthquake caused a tsunami

on the coast south of Lima.

How last major earthquake in Peru, it has happened in the city of Pisco on August 15. The

magnitude was 8.0 and reached practically left the city in ruins with over 500 dead.

A major earthquake mentioned was the case in Chile on February 27, 2010 (Mw = 8.8), which

had numerous aftershocks and triggered a tsunami in the Chilean coast. The earthquake

sparked interest Peruvian engineering by the good performance of seismic protection devices

tested during the earthquake.

STRUCTURAL SYSTEM IN PERU

Structural systems used in the country are varied. It can be found made of adobe structures in

most villages far from major cities. However, you do not develop in this report since reaching

maximum 2 stories and not viable seismic protection.

In the major cities of Peru, the predominant building material is concrete. There are some

mixed steel buildings but in less number.

In the case of residential buildings, which get to be between 4 and 20 floors, the structural

system is the most widely used of reinforced concrete walls, known in the trade as buildings

limited ductility walls (EMLD). You can also find dual systems (frames more walls) for this type

of housing.

For commercial and office buildings structural system is the most widely used dual

combination of gates and walls. The tallest building currently is 40 floors and is for this type of 

building.

The Peruvian Earthquake Resistant Design Standard E.030 stable qualifying other buildings that

are worth highlighting.

7/30/2019 Sis Mor Resistent e

http://slidepdf.com/reader/full/sis-mor-resistent-e 2/2

According to the structural system and the material used, determines the E.030 standard

reduction parameter R, ductility or coefficient for buildings as follows:

TABLE No. 6 of standard E.030

For the movement may suffer side buildings, the E.030 standard limits the relativedisplacements of mezzanine, drifts, as the chart below shows that depends on the material

used in the structure:

TABLE No. 8 Standard E.030

Additionally, the Standard E.030 classifies buildings according to their use in determining the

seismic parameter U. This classification divides the buildings in essential, important, and less

common.

PERUVIAN BUILDINGS WITH RECENT SEISMIC PROTECTION

Currently the country has a limited number of buildings with seismic protection. However,

project has several buildings with these systems.

The types of protection systems are used by seismic energy dissipation and insulation at the

base.

Of the most commonly used types of energy dissipation in Peru are the viscous fluid coolers

and heatsinks hysteretic (or creep). The viscous fluid type heat sinks have the peculiarity of 

being constituted by metallic bracing elements, which contain a device viscoelastic damper.

The heat sinks are devices hysteretic steel sheets compounds as ADAS.

In the case of the insulation system in the base, the most widely used type of insulator is

compound elastomeric neoprene sheets and steel and lead core.

Below are different constructions presenting seismic protection system. Some are

reinforcement of existing structures and others are new or proposed structures. For each

describes the structural system and seismic protection system with that account.