scholarly journals The Effect of Concrete Footing Shape in Differential Settlement: A Seismic Design

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Abdoullah Namdar ◽  
Yun Dong ◽  
Yin Deyu
Keyword(s):  
Strain Energy ◽  
Damping Ratio ◽  
Research Work ◽  
Interaction Mechanism ◽  
Cyclic Strain ◽  
Differential Settlement ◽  
Failure Patterns ◽  
Carry Capacity ◽  
Soil Foundation ◽  
Concrete Footing

This paper presents the numerical results of concrete footing-soil foundation seismic interaction mechanism. The concrete footing has been made with two different shapes, but with the equal volume of concrete material. The concrete footing-soil foundation has been analyzed using nonlinear finite elements, with the fixed-base state. The simulated near-fault ground motions have been applied to the concrete footing-soil foundation. The problem has been formulated based on the settlement controlled analysis. The local geotechnical conditions of all configurations have been analyzed. The numerical analysis results indicate that the shape of a concrete footing alters seismic response, revises inertial interaction, enhances damping ratio, improves load carry capacity, modifies cyclic differential settlement, revises failure patterns, minimizes nonlinear deformation, and changes cyclic strain energy dissipation. The novelty of this research work is the strain energy has more been dissipated with artistic concrete footing design.

scholarly journals Seismic Resistance and Displacement Mechanism of the Concrete Footing

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Abdoullah Namdar ◽  
Yun Dong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain Energy ◽  
Seismic Behavior ◽  
Experimental Results ◽  
Seismic Resistance ◽  
Load Response ◽  
Seismic Simulation ◽  
Soil Foundation ◽  
Concrete Footing

A realistic seismic simulation of the concrete footing has been made by using finite element method (FEM) software called ABAQUS. The effect of concrete footing embedment in soil on concrete footing-soil foundation interaction has numerically been simulated for considering displacement, stress, strain, and seismic acceleration load response at the base of a concrete footing. The results showed that the height of embedded concrete footing in soil foundation controls (i) mechanism and magnitude of lateral, vertical, and differential displacements of the concrete footing, (ii) strain energy, the acceleration load response, and stress paths, and (iii) concrete footing-soil foundation interaction. Compared with various theoretical and experimental results reported in the literature, the present study provides realistic seismic behavior of concrete footing-soil foundation interaction.

An Energy-Based Approach to the Generalized Optimal Locations of Viscous Dampers in Two-Way Asymmetrical Buildings

2014 ◽  
Vol 30 (2) ◽  
pp. 867-889 ◽  
Author(s):  
Jui-Liang Lin ◽  
Manh-Tien Bui ◽  
Keh-Chyuan Tsai
Keyword(s):  
Strain Energy ◽  
Ground Motions ◽  
Damping Ratio ◽  
Intrinsic Property ◽  
Simple Approach ◽  
Engineering Practice ◽  
Viscous Dampers ◽  
Response Parameter ◽  
Control Target ◽  
Target Performance

This paper proposes a simple approach to the generalized optimal locations of linear viscous dampers in elastic two-way asymmetrical buildings under bi-directional ground excitations. The control target used in this optimization process is to maximize the average dissipation rate of the overall strain energy of the two-way asymmetrical building under the ground excitation of two bi-directional unit impulses. The proposed control target, referred to as the smeared damping ratio, is an intrinsic property of the building system. Two advantages of the proposed approach appeal to engineering practice. First, the proposed approach does not require a complicated optimization algorithm. Second, due to the employment of an intrinsic property rather than a certain response parameter as the target performance index, the optimal damper locations resulting from the proposed approach are generalized, which are independent on the characteristics of input ground motions.

scholarly journals Evolution Mechanisms of Thermal Shock Cracks in Ceramic Sheet

2016 ◽  
Vol 83 (7) ◽  
Author(s):  
Xianghong Xu ◽  
Zhongkang Lin ◽  
Shilong Sheng ◽  
Wenjun Yuan
Keyword(s):  
Thermal Shock ◽  
Elastic Strain ◽  
Strain Energy ◽  
Damage Mechanics ◽  
Interaction Mechanism ◽  
Elastic Strain Energy ◽  
Water Quenching ◽  
Multiple Cracks ◽  
Failure Evolution ◽  
Cracks Interaction

Knowledge of crack initiation, propagation, and corresponding thermal shock failure evolution is prerequisite for effective maintenance of civil engineering so as to avoid disaster. Experimental analysis of the cracking in the ceramic sheets subsequent to water quenching has been conducted. Based on statistical mesoscopic damage mechanics, it was revealed that there are four stages in the process of thermal shock evolution of ceramics subjected to water quenching. The multiple cracks interaction mechanism has been analyzed from the viewpoint of the evolution of the elastic strain energy and stress intensity factor.

Variations of Mechanical Parameters and Strain Energy Dissipated During Tension-Torsion Loading

2012 ◽  
Vol 57 (1) ◽  
pp. 193-197 ◽  
Author(s):  
T. Szymczak ◽  
Z. Kowalewski
Keyword(s):  
Yield Point ◽  
Strain Energy ◽  
Tensile Deformation ◽  
Complex Loading ◽  
Cyclic Strain ◽  
Plane Stress State ◽  
Mechanical Parameters ◽  
Hardening Modulus ◽  
Plastic Strain Energy ◽  
Energy Dissipated

Variations of Mechanical Parameters and Strain Energy Dissipated During Tension-Torsion LoadingThe paper presents behaviour of materials under complex loading being combinations of torsion-reverse-torsion cycles superimposed on monotonic tensile deformation. The 2024 aluminium alloy, P91 steel and M1E copper were investigated under plane stress state using thin-walled tubular specimens. All tests were strain controlled and a total strain was less than 1%. An influence of torsion cycles on tensile characteristic was manifested by lowering of the proportional limit and yield point. This effect was increased with magnification of cyclic strain amplitude and in the case of copper a reduction of yield point was equal around 90%. A character of this effect was checked using the yield surface concept after each test. The papers also presents, variations of tangential hardening modulus and plastic strain energy dissipation.

Analysis of Differential Settlement Influence on Internal Force of Box Culvert Structure

2013 ◽  
Vol 353-356 ◽  
pp. 225-228
Author(s):  
Fang Ding He ◽  
Jin Ping Cui ◽  
Jun Sui ◽  
Yi Fan Yu
Keyword(s):  
Traffic Safety ◽  
Soft Soil ◽  
Internal Force ◽  
Differential Settlement ◽  
Highway Engineering ◽  
Foundation Treatment ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Box Culvert ◽  
Powder Spraying

The foundation settlement of soft soil highway engineering is too large, resulting in pavement wave-like because of differential settlement between the structure and adjacent soft soil foundation, which seriously impacts on traffic safety. Considering the soft soil foundation in the foundation treatment methods of CFG pile, sand bag well, powder spraying pile, we analyze differential settlement on the degree of influence structure internal force distribution, then provide the reference for the design and calculation.

scholarly journals Towards Understanding Fatigue Disbond Growth via Cyclic Strain Energy

2014 ◽  
Vol 3 ◽  
pp. 610-615 ◽  
Author(s):  
J.A. Pascoe ◽  
R.C. Alderliesten ◽  
R. Benedictus
Keyword(s):  
Strain Energy ◽  
Cyclic Strain

Damage Parameter Assessment for Energy Based Fatigue Life Prediction Methods

2012 ◽  
Author(s):  
Casey M. Holycross ◽  
John N. Wertz ◽  
Todd Letcher ◽  
M.-H. Herman Shen ◽  
Onome E. Scott-Emuakpor ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Energy Dissipation ◽  
Strain Energy ◽  
Life Prediction ◽  
Low Cycle Fatigue ◽  
Cyclic Strain ◽  
Damage Parameter ◽  
Fatigue Life Prediction ◽  
Cyclic Behavior ◽  
Fracture Processes

An energy-based method used to predict fatigue life and critical life of various materials has been previously developed, correlating strain energy dissipated during monotonic fracture to total cyclic strain energy dissipation in fatigue fracture. This method is based on the assumption that the monotonic strain energy and total hysteretic strain energy to fracture is equivalent. The fracture processes of monotonic and cyclic failure modes can be of stark contrast, with ductile and brittle fracture dominating each respectively. This study proposes that a more appropriate damage parameter for predicting fatigue life may be to use low cycle fatigue (LCF) strain energy rather than monotonic energy. Thus, the new damage parameter would capture similar fracture processes and cyclic behavior. Round tensile specimens machined from commercially supplied Al 6061-T6511 were tested to acquire LCF failure data in fully reversed loading at various alternating stresses. Results are compared to both monotonic and cyclic strain energy dissipation to determine if LCF strain energy dissipation is a more suitable damage parameter for fatigue life prediction.

scholarly journals Interlaminar Fatigue Crack Propagation in Mode I of Carbon Fiber/PEEK Composites

1993 ◽  
Vol 2 (1) ◽  
pp. 096369359300200
Author(s):  
G C Christopoulos ◽  
S A Paipetis
Keyword(s):  
Strain Energy ◽  
Strain Energy Release Rate ◽  
Double Cantilever Beam ◽  
Cyclic Strain ◽  
Strain Energy Release ◽  
Mode I ◽  
Interlaminar Fracture Toughness ◽  
Fatigue Cycle ◽  
Delamination Growth ◽  
Thermoplastic Matrix

A study of the mode I interlaminar fracture toughness of a unidirectional carbon fibre reinforced thermoplastic matrix composite has been made using Double Cantilever Beam, DCB, specimens. Delamination growth per fatigue cycle, da/dN, was related with the maximum applied cyclic strain energy release rate, GIMAX, using a power law.

Introducing Dynamic Nonlinear Soil-Foundation-Structure Interaction Effects in Displacement-Based Seismic Design

2013 ◽  
Vol 29 (2) ◽  
pp. 475-496 ◽  
Author(s):  
Roberto Paolucci ◽  
Raffaele Figini ◽  
Lorenza Petrini
Keyword(s):  
Seismic Design ◽  
Damping Ratio ◽  
Time History ◽  
Nonlinear Behavior ◽  
Interaction Effects ◽  
Structure Interaction ◽  
Soil Foundation ◽  
Displacement Based ◽  
Dynamic Time ◽  
Displacement Based Seismic Design

An iterative linear-equivalent procedure to take into account nonlinear soil-structure interaction effects in the displacement-based seismic design is presented for the case of shallow foundations. The procedure is based on the use of empirical curves to evaluate the stiffness degradation and the increase of damping ratio as a function of foundation rotation. Iterations are performed to ensure that admissible values of foundation rotations are complied with, in addition to the standard checks on structural displacements and drifts. Some examples of application of the approach to the design of bridge piers are provided. Design results are checked by means of nonlinear dynamic time-history analyses performed by a macro-element-based numerical tool, assuming nonlinear behavior of both structure and soil-foundation system.

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