Vasant Matsagar
Indian Institute of Technology Delhi, Civil Engineering, Faculty Member
- http://ltu.academia.edu/DrVasantMatsagaredit
A raised structure that allows the movement of vehicles or pedestrians over an obstacle. Introduction For millennia bridges have been used to cross barriers, typically a river, stream, or valley, by using locally available materials, such... more
A raised structure that allows the movement of vehicles or pedestrians over an obstacle.
Introduction
For millennia bridges have been used to cross barriers, typically a river, stream, or valley, by using locally available materials, such as stones, timber. Originally, cut trees were simply placed across streams to allow crossing. Later, pieces of wood were lashed together to make the improvements in functionality of the bridges. Such bridges are known as frame bridges. Since these early times bridge engineering has evolved into a major discipline in itself, one that benefits from the advances made in other engineering disciplines, such as engineering geology, water resources engineering, geotechnical engineering, and structural engineering. Based on these disciplines, modern bridge engineering mainly deals with (a) planning, (b) analysis, (c) design, (d) construction, (e) maintenance, and (f) rehabilitation. In modern society, bridges facilitate in surface transportation for roads and railways and carry facilities such as water/ sewer supply pipelines or electric/telephone communication lines across streams or gorges. In congested city centers, flyovers/overbridges serve to cross roads without mixing of the traffic moving across in different directions. Therefore, they are an essential part of daily life that aids a prospering trade and commerce in a city. Maintenance and repair of bridges, therefore, has consequences on the economy of the region, which mandates finding technological solutions for increasing their longevity. Bridgesarecalledlifelinestructuresbecauseapartfromthe day-to-day services, during natural calamities such as earthquakesor floods,they facilitate in providing emergency relief by enabling supply of food, medicine, etc., into hazard affected areas. Typically, structural redundancy in bridges is relatively low.
Introduction
For millennia bridges have been used to cross barriers, typically a river, stream, or valley, by using locally available materials, such as stones, timber. Originally, cut trees were simply placed across streams to allow crossing. Later, pieces of wood were lashed together to make the improvements in functionality of the bridges. Such bridges are known as frame bridges. Since these early times bridge engineering has evolved into a major discipline in itself, one that benefits from the advances made in other engineering disciplines, such as engineering geology, water resources engineering, geotechnical engineering, and structural engineering. Based on these disciplines, modern bridge engineering mainly deals with (a) planning, (b) analysis, (c) design, (d) construction, (e) maintenance, and (f) rehabilitation. In modern society, bridges facilitate in surface transportation for roads and railways and carry facilities such as water/ sewer supply pipelines or electric/telephone communication lines across streams or gorges. In congested city centers, flyovers/overbridges serve to cross roads without mixing of the traffic moving across in different directions. Therefore, they are an essential part of daily life that aids a prospering trade and commerce in a city. Maintenance and repair of bridges, therefore, has consequences on the economy of the region, which mandates finding technological solutions for increasing their longevity. Bridgesarecalledlifelinestructuresbecauseapartfromthe day-to-day services, during natural calamities such as earthquakesor floods,they facilitate in providing emergency relief by enabling supply of food, medicine, etc., into hazard affected areas. Typically, structural redundancy in bridges is relatively low.
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ABSTRACT The effectiveness of optimal single tuned mass damper (STMD) for wind and earthquake response control of high-rise building is investigated. Two buildings one 76-storey benchmark building and one 20-storey benchmark building are... more
ABSTRACT The effectiveness of optimal single tuned mass damper (STMD) for wind and earthquake response control of high-rise building is investigated. Two buildings one 76-storey benchmark building and one 20-storey benchmark building are modeled as shear type structure with a lateral degree-of-freedom at each floor, and STMD is installed at top or different floors. The structure is controlled by installing STMD at different locations. The modal frequencies and mode shapes of the buildings are determined. Several optimal locations are identified based on the mode shapes of the uncontrolled and controlled benchmark building. The STMD is placed where the mode shape amplitude of the benchmark building is the largest/larger in the particular mode and each time tuned with the corresponding modal frequency, while controlling up to first five modes. The coupled differential equations of motion for the system are derived and solved using Newmark’s step-by-step iteration method. The variations of buildings responses under wind and earthquake forces are computed to study the effectiveness of the STMD. In addition the optimum mass ratios for STMD are obtained. It is observed that the STMD is effective to control the responses of structures subjected to wind and earthquake. Further, STMD tuned to higher modal frequencies will be effective to reduce the responses of the building significantly.
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Research Interests: Earthquake Engineering, Seismic Hazard, Seismic Base Isolation, Natural Science, Base Isolation, and 10 moreStructural Earthquake Engineering, Seismic Engineering, Earthquakes, Storage Tanks, Liquid Sloshing, Seismic analysis and design, Tanks, Liquid Retaining Tanks, Finte Elemenrt Analysis of Water Tanks and Other Liquid Retaing Structure, and A
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The influence of isolator characteristics on the seismic response of multi-story base-isolated structure is investigated. The isolated building is modeled as a shear type structure with lateral degree-of-freedom at each floor. The... more
The influence of isolator characteristics on the seismic response of multi-story base-isolated structure is investigated. The isolated building is modeled as a shear type structure with lateral degree-of-freedom at each floor. The isolators are modeled by using two different mathematical models depicted by bi-linear hysteretic and equivalent linear elastic–viscous behaviors. The coupled differential equations of motion for the isolated system
Research Interests: Civil Engineering, Earthquake Engineering, Nonlinear Dynamics and Stochasticity, Structural Dynamics, Linear Elasticity, and 20 moreStructures and Fire Engineering, Seismic Base Isolation, Friction Models, Base Isolation, Nonlinear Control, High Frequency, Noise and Vibration Control and Prediction, Nonlinear Analysis, Damping, Earthquake Seismology, Characteristics, Mathematical Model, Linear System, Viscous damping, Hystersis Curve, Seismic response, Stiffness Degradation, Differential equation, Vibration Control and Analysis, and Degree of Freedom
Conference code: 101944, Export Date: 17 May 2014, Source: Scopus, Language of Original Document: English, Correspondence Address: Department of Civil Engineering, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi, India,... more
Conference code: 101944, Export Date: 17 May 2014, Source: Scopus, Language of Original Document: English, Correspondence Address: Department of Civil Engineering, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi, India, References: (1998) Design and Construction of Large, Welded, Low-pressure Storage Tanks, , API-620 . Washington D. C. USA: American Petroleum Institute;
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Research Interests: Economics, Composite Materials and Structures, Concrete, Composite Materials, Bridge Engineering, and 24 moreFinancial and Investment Analysis, Infrastructure Development, Reinforced Concrete Structures, prestressed Concrete, Infrastructure, CFRP, Construction Cost, Cost effectiveness, Life-Cycle Cost Analysis, Behavior of Concrete Structures Reinforced with FRP Composites, Probabilistic Analysis, Benefit Cost Analysis, Life cylce of the urban building stock, Reinforced concrete, Cost Efficiency, Asset and investment valuation, Cost Benefit Analysis, Service Life, carbon fiber reinforcement polymer (CFRP), Cement and Concrete Materials, Carbon Fiber Composites, Bridge Infrastructure Planning, Composites in Bridges, and Carbon Fiber Reinforced Polymer Sheets
Research Interests: Civil Engineering, Earthquake Engineering, Structural Dynamics, Structures and Fire Engineering, Seismic Base Isolation, and 12 moreEarthquake resistant design, Base Isolation, Seismic Engineering, Seismic Pounding, Retaining Wall, Acceleration, Earthquake Response, Multistorey building design, Seismic resistant design of structures, SEPARATION DISTANCE TO AVOID SEISMIC POUNDING OF structurs, Seismic response, and Pounding of Adjacent Structures
Abstract: The seismic response of simply supported base-isolated bridge with different isolators is presented. The isolated bridge deck is idealized using simplified model of a simply supported rigid deck with three degrees-of-freedom,... more
Abstract: The seismic response of simply supported base-isolated bridge with different isolators is presented. The isolated bridge deck is idealized using simplified model of a simply supported rigid deck with three degrees-of-freedom, two lateral translational, mutually orthogonal and one rotational. The rotational degree-of-freedom of the bridge deck may arise because of the dissimilarity in properties of different seismic isolation devices such as elastomeric and sliding systems supporting the bridge deck. The sources of dissimilarity in ...
Research Interests: Structural Engineering, Seismic Hazard, Structural Dynamics, Bridge Engineering, Seismic Base Isolation, and 12 moreBase Isolation, Structural Earthquake Engineering, Seismic Engineering, Structural Design, Structural Designs in Bridges, Asymmetry, Bridges, Seismic resistant design of structures, Seismic response, Ground Motion, HIGHWAY ROADS AND BRIDGES, and Comparative Study of Response of Bridges with and Without Seismic Isolation
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Liquid storage tanks are essential component of petroleum industries, thermal power plants, chemical factories and numerous other important industries along with civil society. Herein, seismic fragility of base-isolated liquid storage... more
Liquid storage tanks are essential component of petroleum industries, thermal power plants, chemical factories and numerous other important industries along with civil society. Herein, seismic fragility of base-isolated liquid storage tank is evaluated to assess the performance of various base isolation systems in enhancing the seismic protection. The liquid storage tank is modeled using lumped mass mechanical analog. Failure of the liquid storage tank is defined in terms of buckling of the tank wall in elastic range. The maximum displacement at isolation level is also considered in the failure criteria. The equations of motion are solved using Newmark’s method to obtain the peak response quantities of the base-isolated liquid storage tank. Two different configurations, i.e. broad and slender, of the base-isolated liquid storage tanks are chosen for the comparison. Monte Carlo (MC) simulation is used to obtain the probability of failure (p f) at different seismic intensity level. The probability of failure for the slender tank is observed more as compared to the broad tank. The seismic fragility of the base-isolated liquid storage tanks is evaluated considering the randomness in the earthquake ground motion. Seismic performance of fixed-base tanks are compared with the base-isolated tanks in terms of the probability of failure. It is observed that the base isolation enhances the seismic performance of the liquid storage tanks irrespective of the type of isolation system. However, enhancement in the seismic performance of the liquid storage tanks varies significantly for different isolation systems considered in the present study.
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For millennia bridges have been used to cross barriers, typically a river, stream, or valley, by using locally available materials, such as stones, timber. Originally, cut trees were simply placed across streams to allow crossing. Later,... more
For millennia bridges have been used to cross barriers, typically a river, stream, or valley, by using locally available materials, such as stones, timber. Originally, cut trees were simply placed across streams to allow crossing. Later, pieces of wood were lashed together to make the improvements in functionality of the bridges. Such bridges are known as frame bridges . Since these early times bridge engineering has evolved into a major discipline in itself, one that benefits from the advances made in other engineering disciplines, such as engineering geology, water resources engineering, geotechnical engineering, and structural engineering. Based on these disciplines, modern bridge engineering mainly deals with (a) planning, (b) analysis, (c) design, (d) construction, (e) maintenance, and (f) rehabilitation. In modern society, bridges facilitate in surface...