Seismic Analysis of Municipal Solid Waste Landfill in India

2015 ◽  
Vol 6 (2) ◽  
pp. 35-55 ◽  
Author(s):  
B.P. Naveem ◽  
T.G. Sitharam ◽  
P.V. Sivapullaiah
Keyword(s):  
Seismic Analysis ◽  
Damping Ratio ◽  
Linear Method ◽  
Shear Stiffness ◽  
Field Testing ◽  
Unit Weight ◽  
Response Analysis ◽  
Msw Landfill ◽  
Semi Empirical ◽  
Equivalent Linear Method

This paper presents, unit weight, shear wave velocity, strain-dependent normalized shear modulus reduction and material damping ratio relationships for Mavallipura landfill are developed based on field testing, laboratory measurements and also validated using semi-empirical methods. In addition, one-dimensional seismic response analysis by an equivalent linear method for Mavallipura landfill, Bangalore using the software like SHAKE2000 and DEEPSOIL. Results indicated that the MSW landfill has less shear stiffness and more amplification due to the loose filling and damping, which need to be accounted for seismically safe MSW landfill design in India.

Seismic Behavior and Dynamic Site Response of Municipal Solid Waste Landfill in India

2018 ◽  
pp. 168-196 ◽  
Author(s):  
Naveen B. P. ◽  
Sitharam T. G. ◽  
Sivapullaiah P. V.
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Seismic Response ◽  
Seismic Behavior ◽  
Dynamic Properties ◽  
Site Response ◽  
Damping Ratio ◽  
Linear Method ◽  
Response Analysis ◽  
Msw Landfill

Seismic behavior of landfills need for a better understanding of the dynamic properties of municipal solid waste (MSW) and site response of MSW landfill during seismic events. This chapter presents unit weight, shear wave velocity, strain-dependent normalized shear modulus reduction, and material damping ratio relationships for Mavallipura landfill based on field testing, laboratory measurements, and validated using semi-empirical methods. In addition, one-dimensional seismic response analysis by an equivalent linear method for Mavallipura landfill, Bangalore is done using software like SHAKE2000 and DEEPSOIL. Results indicated that the MSW landfill has less shear stiffness and more amplification due to the loose filling and damping, which need to be accounted for by seismically safe MSW landfill design in India. Also, results of seismic response analyses performed by the authors and other researchers are examined to assess the impact of stiffness and height of the landfill refuse fill on the overall response.

Non Linear Response of Fixed Offshore Platforms to Seismic Excitation Including Soil-Pile-Structure Interaction

2008 ◽  
Author(s):  
Ehssan Zargar ◽  
Ali Akbar Aghakouchak ◽  
Amin Aghakouchak
Keyword(s):  
Seismic Analysis ◽  
Site Response ◽  
Damping Ratio ◽  
Geometrical Nonlinearity ◽  
Radiation Damping ◽  
Response Analysis ◽  
Offshore Platforms ◽  
Soil Layers ◽  
Structure Interaction ◽  
Nonlinear Site Response

A nonlinear seismic soil-pile-structure interaction (SSPSI) analysis of fixed offshore platforms constructed on pile foundations including both vertical and battered piles is presented. The analysis is carried out in time domain and the effects of soil nonlinearity, discontinuity at pile soil interfaces, energy dissipation through soil radiation damping, formation of soil layers on bed rock, structural material nonlinearity and geometrical nonlinearity are considered. A combination of FEM approach and BNWF approach is used in modeling pile (substructure), platform structure (superstructure) and soil media. Gapping in clay is modeled by a special connector configuration. To find out the ground motion of soil layers caused by earthquake excitations at bed rock, a nonlinear site response analysis is performed. The effects of soil-pile-structure interaction on nonlinear seismic analysis of offshore platforms are discussed. It is generally concluded that considering soil-pile-structure interaction causes higher deflections and lower stresses in the platform elements due to soil flexibility, nonlinearity and radiation damping and leads to a more feasible and realistic platform design. The sequence of generation of plastic zones in the structure and their distribution are also investigated. Sensitivity of results to soil layers configuration and soil material damping ratio are discussed.

Nonlinear Seismic Response Analysis of Canyons in Layered Sites

2013 ◽  
Vol 438-439 ◽  
pp. 1559-1562
Author(s):  
Jian Wen Liang ◽  
Ming Liang Liu
Keyword(s):  
Nonlinear Analysis ◽  
Seismic Response ◽  
Linear Method ◽  
Response Spectra ◽  
Linear Analysis ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Nonlinear Seismic Response ◽  
Transmitting Boundary ◽  
Equivalent Linear Method

This paper presents nonlinear seismic response analysis of canyons in layered sites. The equivalent linear method is used in the dynamic analysis and Lysmer-Kuhlemeyer transmitting boundary is added at the left and right boundaries of the computation region. It is shown through numerical examples that, soil nonlinearity has significant effect on seismic ground motion around canyons. There are differences between seismic response amplitudes in nonlinear analysis and those in linear analysis, but the differences are smaller for observation points inside canyons. There are shifts between response spectra in nonlinear analysis and those in linear analysis, but the differences are much larger for observation points inside canyons.

Verification of Seismic Safety Evaluation Program LSSRLI-1 Using Exact Solution

2013 ◽  
Vol 477-478 ◽  
pp. 1052-1055
Author(s):  
Rui Shan Li ◽  
Xiao Ming Yuan
Keyword(s):  
Exact Solution ◽  
Linear Method ◽  
Safety Evaluation ◽  
Wave Theory ◽  
Response Analysis ◽  
Building Structures ◽  
Seismic Safety ◽  
Seismic Safety Evaluation ◽  
Earthquake Response Analysis ◽  
Equivalent Linear Method

Seismic safety evaluation was commonly carried out using an equivalent linear method LSSRLI-1, proposed by Xiaojun Li in 1989, which greatly promoted the development of earthquake resistant engineering of China, for it solved the input problem of earthquake response analysis of building structures. The current situation of seismic response analysis for deposits is described first. Then, a series of deficiencies for the analysis program LSSRLI-1 found in the practice are represented. The exact solution based on the wave theory is used to verify the LSSRLI-1 results without iteration. Comparison show that LSSRLI-1 should be further perfected due to its deviation from exact values, especially when the soil is soft.

Seismic Response Analysis of Double Chains Suspension Bridge Considering Non-Classical Damping

2011 ◽  
Vol 255-260 ◽  
pp. 826-830 ◽  
Author(s):  
Nan Hong Ding ◽  
Li Xia Lin ◽  
Jia De Chen
Keyword(s):  
Seismic Response ◽  
Seismic Analysis ◽  
Damping Ratio ◽  
Suspension Bridge ◽  
Response Analysis ◽  
Equivalent Viscous Damping ◽  
Damping Theory ◽  
Damping Model ◽  
Equivalent Viscous Damping Ratio ◽  
Complex Damping

Damping in double chains suspension bridge is non-uniform, which leads to coupled motion equations in main coordinate system. Based on the complex damping theory to solve equivalent viscous damping ratio used to describe energy dissipation characteristics of non-classical damping system approximately, a method is proposed to analyze seismic response of double chains suspension bridge considering non-classical damping modified by measured value. Influence of different damping forms on seismic response of double chains suspension bridge is analyzed, considering classical damping and non-classical damping respectively, through an example of double chains suspension bridge. The analysis shows that non-classical damping has significant effect on seismic response, and response based on the classical damping model is not reliable to double chains suspension bridge. Non-classical damping model should be used in seismic analysis of double chains suspension bridge, however, the seismic response of non-classical damping system under the longitudinal or vertical seismic wave can be substituted approximately by the seismic response calculated according to damping ratio of concrete tower and steel stiffening girder respectively, which can simplify the calculation during preliminary analysis.

scholarly journals Identification of Dynamic Parameters of Pedestrian Walking Model Based on a Coupled Pedestrian–Structure System

2021 ◽  
Vol 11 (14) ◽  
pp. 6407
Author(s):  
Huiqi Liang ◽  
Wenbo Xie ◽  
Peizi Wei ◽  
Dehao Ai ◽  
Zhiqiang Zhang
Keyword(s):  
Negative Correlation ◽  
Dynamic Properties ◽  
Damping Ratio ◽  
Field Testing ◽  
The Body ◽  
Structural Vibration ◽  
Pedestrian Dynamics ◽  
Structure Interaction ◽  
Mass Spring ◽  
Stiffness And Damping

As human occupancy has an enormous effect on the dynamics of light, flexible, large-span, low-damping structures, which are sensitive to human-induced vibrations, it is essential to investigate the effects of pedestrian–structure interaction. The single-degree-of-freedom (SDOF) mass–spring–damping (MSD) model, the simplest dynamical model that considers how pedestrian mass, stiffness and damping impact the dynamic properties of structures, is widely used in civil engineering. With field testing methods and the SDOF MSD model, this study obtained pedestrian dynamics parameters from measured data of the properties of both empty structures and structures with pedestrian occupancy. The parameters identification procedure involved individuals at four walking frequencies. Body frequency is positively correlated to the walking frequency, while a negative correlation is observed between the body damping ratio and the walking frequency. The test results further show a negative correlation between the pedestrian’s frequency and his/her weight, but no significant correlation exists between one’s damping ratio and weight. The findings provide a reference for structural vibration serviceability assessments that would consider pedestrian–structure interaction effects.

Preliminary microzonation of the Memphis, Tennessee, area

1982 ◽  
Vol 72 (3) ◽  
pp. 1011-1024
Author(s):  
Sunil Sharma ◽  
William D. Kovacs
Keyword(s):  
United States ◽  
Soil Properties ◽  
Damping Ratio ◽  
Ground Surface ◽  
Strong Motion ◽  
Response Analysis ◽  
Borehole Data ◽  
Central United States ◽  
Hazardous Zone ◽  
High Level

abstract The city of Memphis, which is situated very close to the inferred epicenter of one of the three major 1811 to 1812 earthquakes, is in a potentially hazardous zone which will be susceptible to the usual seismic hazards. By recognizing the high level of seismicity in the New Madrid area, this study attempts to microzone the potential hazards by considering the following subjects: (i) the seismicity of the central United States; (ii) design earthquakes; and (iii) response analysis which allows construction of the necessary microzonation maps. The seismicity of the region is evaluated from state-of-the-art literature as there is no recorded strong-motion data available for the central United States. Synthetically generated accelerograms, simulating the design earthquakes, were used to represent the ground motions which were applied at a depth of 45 m, below ground surface, at numerous sites in Memphis. The soil stratigraphy was conceptualized from borehole data, made available by local sources, and dynamic soil properties estimated from available empirical correlations. The results of the response analysis were transformed into microzonation maps depicting: (i) zones showing qualitative estimates of ground response; (ii) zones showing the natural frequency of the soils; (iii) zones showing the peak spectral acceleration for 2 per cent damping ratio; and (iv) zones of liquefaction potential. These maps are useful for preliminary design and are not intended to be used on a quantitative basis. Further investigation is necessary in determining the stratigraphy and soil properties for a site-specific design and analysis.

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