Seismic analysis of structures ppt

Cold War - Blast Analysis 2. Quake Engineering Research 3. State And Federal Freeway System 4. Manned Space Program 5. Offshore Drilling 6. Nuclear Reactors And Cooling Towers.

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Period Of Very High Productivity 2. No Formal Research Institute 3. Free Exchange Of Information — Gave projects to calling preceding distribution 4. Worked Closely With Mathematics Group 5. Students Were Very Successful. Figure Major Approximation The burdens are connected straightforwardly to the structure; while, the genuine tremor removals are connected at the establishment of the genuine structure.

The SRSS blend principle, connected to measure up to spectra, produces indistinguishable results for all reference frameworks and requires stand out examination to deliver all configuration strengths and removals. The CQC3 strategy ought to be utilized where the flat orthogonal segments of the seismic info are not equivalent. If there should arise an occurrence of the seismic investigation of structures almost a shortcoming, the issue typical and parallel movements are not equivalent.

Where the powers following up on the edge component cross-area at time "t" are including the static powers before the use of the dynamic burdens. The experimental constants are code and material ward and are ordinarily characterized as. The particular time the Maximum Peak Values happen is diverse for each period. It is the duty of the designer to glorify the structure effectively and accept accountability for the results. Reaction Spectra Seismic Analysis is an Approximate Method and is limited to straight basic conduct and may fulfill a configuration code.After you enable Flash, refresh this page and the presentation should play.

Get the plugin now. Toggle navigation. Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics. Title: Seismic analysis and design of. Factor depends on ductility. Soil factor.

Important factor Tags: analysis design ductility seismic. Latest Highest Rated. Ahmed Ghobarah 2 Description of the Project Location of the project Height type of the project -The structure is 40 stories office building, m high.

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Live Load L. Earthquake Load E. Wind Load W. OW exterior walls Concrete density? Flooring weight was assumed to be 1. Total No. Height of wall 3.

seismic analysis of structures ppt

Wall length 6 m. L 11 Live Load L. L Axial Load from the L. L on the wall Live Load L. F - Live Load L. F B tributary area.

Flooring 1. Mu Mu - For the edge -ve moment Mu - For the interior -ve moment Mu - L and L.It allows a clear understanding of the contributions of different modes of vibration. It offers a simplified method for finding the design forces for structural members for earthquake. It is also useful for approximate evaluation of seismic reliability of structures. For seismic design, these maximum stresses are of interest, not the time history of stress.

Equivalent lateral force for an earthquake is defined as a set of lateral force which will produce the same peak response as that obtained by dynamic analysis of structures. The equivalence is restricted to a single mode of vibration. Using the acceleration response spectrum, an equivalent static load is derived which will provide the same maximum response as that obtained in each mode of vibration.

Maximum modal responses are combined to find total maximum response of the structure. The first two steps do not have approximations, while the third step has some approximations. As a result, response spectrum analysis is called an approximate analysis; but applications show that it provides mostly a good estimate of peak responses.

Method is developed for single point, single component excitation for classically damped linear systems. As the contributions of responses from different modes constitute the total response, the total maximum response is obtained by combining modal quantities. It ignores the algebraic sign of the response.

Actual time history analysis shows modal peaks occur at different times as shown in Fig. Thus, the combination provides a conservative estimate of response.

When frequencies are not well separated, some errors are introduced due to the degree of correlation of modal responses which is ignored.

Seismic analysis and design of - PowerPoint PPT Presentation

The CQC rule called complete quadratic combination rule takes care of this correlation. Contd 2 max 1 5. Due to the second term, the peak response may be estimated less than that of SRSS. Various expressions for are available; here only two are given : Contd 2 1 1 1 5. Because of the underlying principle of random vibration in deriving the combination rules, the peak response would be better termed as mean peak response.

Fig 5. This relationship is investigated for the smoothed curves of the two. Here a relationship proposed by Kiureghian is presented Contd 0 2. Sway d. For each mode find Eq. Example 5. Contd DYN d.Learn something new every day More Info Seismic analysis is the study of how earthquakes and other seismic events affect buildings, soils and the rocks of the Earth itself.

As a field of study within structural engineeringseismic analysis is often used to study potential damage to buildings and other structures due to earthquakes.

In geologyseismic analysis is used to study the interior of the Earth by analyzing the way seismic waves travel through the materials that make up the planet. Structural engineers employ seismic analysis in a number of ways.

Existing buildings and other structures as well as the surrounding and underlying soils and rocks may be studied with sophisticated simulation software to try to predict how they will act during an earthquake. This study is useful for emergency management, as well as for determining the relative safety and durability of buildings and other structures during and after earthquakes.

These simulations allow structural engineers to recommend possible improvements and retrofits to existing structures to improve their ability to withstand earthquakes and to suggest changes or updates to building codes for areas prone to earthquakes. Architects often work with structural engineers during the design phase of a new building or structure to determine how it will behave if struck by an earthquake.

Many factors, including building design, materials, and the make up of underlying soils and rocks influence how a building will behave during and after an earthquake. Seismic analysis can help determine if a proposed design is strong and safe enough to adequately withstand earthquakes.

Geologists employ seismic analysis to study the interior of the earth. By studying the way seismic waves, either from earthquakes or from man made events like detonations of explosives, travel through the ground, they are able to learn much about the rocks and soils through which the seismic waves travel.

seismic analysis of structures ppt

Seismographs, extremely sensitive instruments that are designed to detect seismic waves, along with other instruments and computers, allow geologists to study layers of the Earth far beneath the surface that they would not otherwise be able to access.

In the mining industryseismic analysis is used by geologists and mining engineers to determine potential places to look for mineral and petrochemical resources.

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Seismic analysis may also be used to predict potential safety problems in mines. Concerns about safety can arise because of the structure of the rocks and soils in which the mining is done as well as because of the way those rocks and soils might act during an earthquake.

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View slideshow of images above. Watch the Did-You-Know slideshow. Follow wiseGEEK. Did You Know? An estimated 15 million girls under age 18 get married every year; that equates to 41, child brides every day. This Day in History. You might also Like. What Is Seismic Data Acquisition?

What Is Seismic Interpretation?

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What Is Seismic Inversion? What Is Seismic Data Processing?It is a big subject and mainly deals with earthquake as a geological process. However, some portions of seismology are of great interest to earthquake engineers. They include causes of earthquake, earthquake waves, measurement of earthquake, effect of soil condition on earthquake, earthquake pre- diction and earthquake hazard analysis.

Understanding of these topics help earthquake engineers in dealing seismic effects on structures in a better way.

Further knowledge of seismology is helpful in describing earthquake inputs for structures where enough recorded data is not available. Before earthquake is looked as a geological process, some knowledge about the structure of earth is in order. In-side the earth. Mantle: lithosphere km ; asthenosphere-plastic molten rock km ; bottom- homogenous; variation of v is less km - km. Lithosphere floats as a cluster of plates with different movements in different directions.

Fig 1. At mid oceanic ridges, two continents which were joined together drifted apart due to flow of hot mantle upward. Flow takes place because of convective circulation of earth's mantle; energy comes from radioactivity inside the earth.

Hot material cools as it comes up; additional crust is formed which moves outward. Concept of plate tectonics evolved from continental drift. New crust sinks beneath sea surface; spreading continues until lithosphere reaches deep sea trenches where subduction takes place. As a result, motions take place through sliding of lithosphere in pieces- called tectonic plates. They move in different directions at different speeds.

Three types of Inter plate interactions exist giving three types of boundaries. Tectonic plates pass each other at the transform faults. Faults at the plate boundaries are the likely locations for earthquakes - inter plate earth- quake. Earthquakes occurring within the plate are caused due to mutual slip of rock bed releasing energy- intra plate earthquake. Slip creates new faults, but faults are mainly the causes rather than results of earthquake.

At the faults two different types of slipage are observed- Dip slip; Strike slip. In reality combination of the types of slipage is observed at the fault line. This accumulation of stresses finally results in inter plate or intra plate earthquakes. In inter- plate earthquake the existing fault lines are affected while intra-plate earthquake new faults are created. During earthquake, slip takes place at the fault; length over which slip takes place could be several kilometres; earthquake origin is a point that moves along the fault line.

Elastic rebound theory, put forward by Reid, gives credence to earthquake caused by slip along faults. Large amplitude shearing displacement that took place over a large length along the San andreas fault led to elastic rebound theory.

Owing to various slow tectonic activities, strains accumulate at the fault over a long time. Strained layers of rock masses bounces back to its unstrained condition. This situation is equivalent to two pairs of coupled forces suddenly acting and thus, moving masses of rock leading to radial waves propagating in all directions. Seismology T. The majority of the waves travels through the rocks within the crust and then passes through the soil to the top surface. Other theory of tectonic earthquake stipulates that the earthquake occurs due to phase changes of rock mass, accompanied by volume changes in small volume of crust.

Those who favour this theory argues that earthquakes do occur at greater depths where faults do not exist.In addition, the process to generate floor response spectra to determine the accelerations and required attachment forces for nonstructural components and systems will be presented. Finley A. Charney, Ph. Marshall, Ph. Course Outline. Contact the Continuing Education Department.

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Help Contact Us. How They Work. Seismic Analysis of Building Structures.

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Instructors Finley A. ASCE Course Benefits Understand the theoretical basis and the appropriate methodology for implementing three primary seismic analysis methods needed to determine the seismic force and deformation demands in ASCE 7 for building structures and nonbuilding structures.

Understand determination of force and deformation demands on nonstructural components in terms of floor spectra which can be easily developed from linear response history analysis. Enhance structural analysis skills for engineers who design structures for seismic loads. Apply equivalent static and linear dynamic analysis methods for determination of seismic demands. Determine which analysis methods are permitted for seismic analysis in accordance with ASCE 7 for a given structure based on the structure characteristics and seismic hazard.

Apply the Equivalent Lateral Force method of analysis to determine seismic demands on building structures as a final design or as a preliminary design for more rigorous analysis methods. Perform unified linear dynamic seismic analysis of structures using either the Modal Response Spectrum or Linear Response History Analysis method to determine seismic force and displacement demands in structures.

Who Should Attend? Practicing Engineers with a basic background in seismic design looking to further develop their skills in the three linear seismic analysis methods in ASCE 7. Course Outline Credits 2.After you enable Flash, refresh this page and the presentation should play.

Get the plugin now. Toggle navigation. Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics.

Description: Seismic Fragility Analysis of Typical. Develop seismic fragility curves to provide a probabilistic description of Tags: midrise analysis concrete fragility low reinforced seismic structures typical. Latest Highest Rated. Earthquake ground motion simulation. Probabilistic ground motions for selected cities in the upper Mississippi embayment. Seismic design criteria for slab-column connections.

Probabilistic capacity models and fragility estimates for reinforced concrete columns based on experimental observations. Journal of Engineering Mechanics, V. Seismic retrofit of a reinforced concrete flat-slab structure Part II seismic fragility analysis.

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