scholarly journals Correspondence Analysis of Soil around Micropile Composite Structures under Horizontal Load

2015 ◽  
Vol 2015 ◽  
pp. 1-12
Author(s):  
Hai Shi ◽  
Mingzhou Bai ◽  
Chao Li ◽  
Yunlong Zhang ◽  
Gang Tian
Keyword(s):  
Theoretical Approach ◽  
Composite Structures ◽  
Internal Force ◽  
Current Approach ◽  
Winkler Foundation ◽  
Beam Model ◽  
Horizontal Load ◽  
Pile Deformation ◽  
Rigidity Coefficient ◽  
Force Calculation

The current approach, which is based on conformal transformation, is to map micropile holes in comparison with unit circle domain. The stress field of soil around a pile plane, as well as the plane strain solution to displacement field distribution, can be obtained by adopting complex variable functions of elastic mechanics. This paper proposes an approach based on Winkler Foundation Beam Model, with the assumption that the soil around the micropiles stemmed from a series of independent springs. The rigidity coefficient of the springs is to be obtained from the planar solution. Based on the deflection curve differential equation of Euler-Bernoulli beams, one can derive the pile deformation and internal force calculation method of micropile composite structures under horizontal load. In the end, we propose reinforcing highway landslides with micropile composite structure and conducting on-site pile pushing tests. The obtained results from the experiment were then compared with the theoretical approach. It has been indicated through validation analysis that the results obtained from the established theoretical approach display a reasonable degree of accuracy and reliability.

Dynamic Response and Internal Force of Partially Embedded Single Pile with Distributed Loads

2013 ◽  
Vol 353-356 ◽  
pp. 324-328
Author(s):  
Hong Yong Lv ◽  
Qing Ren
Keyword(s):  
Dynamic Characteristics ◽  
Transfer Matrix Method ◽  
Internal Force ◽  
Beam Model ◽  
Single Pile ◽  
Lateral Vibration ◽  
Vibration Model ◽  
Internal Forces ◽  
Model Transfer ◽  
Pile Deformation

Dynamic characteristics of pile under distributed loads have aroused strong attention in the engineering field. Based on the Winkler beam model, transfer matrix method is used to build lateral vibration model for the partially embedded single pile with distributed loads. The method for solving pile deformation and internal force is shown. The influence to deformation and internal forces of partially embedded pile by load form is analyzed.

Elastic Modulus Reduction Method Based Limit Analysis of Steel Lined Reinforced Concrete Penstocks Containing Flaws

2013 ◽  
Vol 671-674 ◽  
pp. 879-883
Author(s):  
Shu Lin Liu ◽  
Chuan Xiong Fu ◽  
Wei Zhang
Keyword(s):  
Elastic Modulus ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Reduction Method ◽  
Internal Force ◽  
Ultimate Bearing Capacity ◽  
Curve Beam ◽  
Beam Model ◽  
Force Calculation ◽  
Modulus Reduction

In the context of ultimate bearing capacity of steel lined reinforced concrete penstock (SLRCP) containing flaws, the use of the elastic modulus reduction method (EMRM) in conjunction with curve beam based internal force calculation is presented. The corrosion models for steel bar and lining are introduced from the literature. The SLRCP is considered bearing load together with lining and reinforced concrete, and its internal force is determined based on a simplified curve beam model. The element bearing ratio of SLRCP is given through the internal force and sectional strength, and is employed by the EMRM. The change of ultimate bearing capacity of some typical SLRCP within their operating life is then evaluated.

Study on Damage Mechanism for Foundation Pile of Girder Bridge under Seismic Influence

2012 ◽  
Vol 530 ◽  
pp. 115-121
Author(s):  
Hong Kai Chen ◽  
Hong Mei Tang ◽  
Xian Tao Zhao ◽  
Yi Hu ◽  
Xiao Ying He
Keyword(s):  
Dynamic Response ◽  
Failure Modes ◽  
Slenderness Ratio ◽  
Damage Mechanism ◽  
Internal Force ◽  
Seismic Load ◽  
Dynamic Resistance ◽  
Winkler Foundation ◽  
Beam Model ◽  
Girder Bridge

Based on the analysis for seismic load and failure modes of pile foundation, this article adopts dynamic Winkler foundation beam model, and employs continuous distributional and independent spring and damper, instead of the dynamic resistance of the soil around the pile, and to explore interaction between pile and soil dynamic at horizontal load. In consideration of six kinds of boundary conditions combination, this paper proposes the solution method for displacement and internal force on pile. From analysis of cases, it finds that the effect of pile’s length on dynamic response can be negligible when pile slenderness ratio l/d>20, and the pile can be simplified into infinite long pile. Dynamic response of pile increases with the increase of stiffness ratio. When establish the control equations, influence of axial force can not be ignore. Otherwise, results will be small than the actual value.

Structural Analysis and Internal Force Calculation of Variable Cross-Section Silo

2012 ◽  
Vol 446-449 ◽  
pp. 429-434
Author(s):  
Rui Ting Ma
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Internal Force ◽  
Variable Cross ◽  
Axially Symmetric ◽  
Internal Forces ◽  
Differential Element ◽  
Symmetric Load ◽  
Force Calculation ◽  
Constant Section

In this paper, the differential element of constant-section silo wall suffering from axially symmetric load is analyzed. From the results of constant-section silo, the author derives the displacements and internal forces of variable cross-section silo. Through a specific example, this paper compares the displacements , internal forces and concrete consumption of variable cross-section silo with those of constant-section silo, and discusses the merits of variable cross-section silo.

Internal force calculation of half through arch bridge based on elastic foundation beam algorithm

2021 ◽  
Author(s):  
Yurong Ma ◽  
Yuyi Zhang ◽  
Qianwen Han ◽  
Feng Wang ◽  
Yaqiong Jiang ◽  
...  
Keyword(s):  
Elastic Foundation ◽  
Internal Force ◽  
Arch Bridge ◽  
Force Calculation ◽  
Elastic Foundation Beam

scholarly journals Impact Pseudostatic Load Equivalent Model and the Maximum Internal Force Solution for Underground Structure of Tunnel Lining

2016 ◽  
Vol 2016 ◽  
pp. 1-16
Author(s):  
Xuan Guo ◽  
Xiao Xin Zhang
Keyword(s):  
Model Test ◽  
Internal Force ◽  
Measured Data ◽  
Tunnel Lining ◽  
Theoretical Solution ◽  
Equivalent Model ◽  
Theoretical Formula ◽  
Circular Tunnel ◽  
Lining Structure ◽  
Force Calculation

The theoretical formula of the maximum internal forces for circular tunnel lining structure under impact loads of the underground is deduced in this paper. The internal force calculation formula under different equivalent forms of impact pseudostatic loads is obtained. Furthermore, by comparing the theoretical solution with the measured data of the top blasting model test of circular formula under different equivalent forms of impact pseudostatic loads are obtained. Furthermore, by comparing the theoretical solution with the measured data of the top blasting model test of circular tunnel, it is found that the proposed theoretical results accord with the experimental values well. The corresponding equivalent impact pseudostatic triangular load is the most realistic pattern of all test equivalent forms. The equivalent impact pseudostatic load model and maximum solution of the internal force for tunnel lining structure are partially verified.

Uncertainty Bounding of CFRP Beams Towards Robust Control of Flexible Composite Structures

2017 ◽  
Author(s):  
Alexander H. Pesch ◽  
Tamunomiesiya LongJohn ◽  
Kristopher Wagner ◽  
Brian J. McAndrews
Keyword(s):  
Composite Materials ◽  
Robust Control ◽  
Composite Structures ◽  
Flexible Structures ◽  
Element Model ◽  
Modal Parameters ◽  
Parametric Uncertainties ◽  
Beam Model ◽  
Carbon Fiber Reinforce Polymer ◽  
Control Framework

As composite materials are becoming increasingly applied in actively controlled flexible structures, the need for practical uncertainty bounding to capture the effect of normal manufacturing variations on their dynamic behavior is also increasing. Currently, there is a lack of quantification of manufacturing variation of composite materials cast in a robust control framework. This work presents a simple experimental study on a particular case of composite member. The modal parameters of a set of 12 unidirectional carbon fiber reinforce polymer beams are identified. A nominal finite element model is numerically fit to the average experimental natural frequencies and antiresonances. The model is augmented with real parametric uncertainties placed on the modal parameters. The bound on the uncertainties is found both deterministically, to capture all experimentally observed data, and stochastically using a predetermined confidence interval. The two uncertainty bounding approaches are compared through the resulting bound on the beam model frequency response. Also, simulations are conducted to compare possible time responses using the two uncertainty bounds. It is found that the utilized structure of parametric uncertainties is effective at capturing the experimentally observed behavior.

scholarly journals Stability Analysis of Rib Pillars in Highwall Mining Under Dynamic and Static Loads in Open-Pit Coal Mine

2021 ◽  
Author(s):  
Haoshuai Wu ◽  
Yanlong Chen ◽  
Haoyan Lv ◽  
Qihang Xie ◽  
Yuanguang Chen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Stability Analysis ◽  
Theoretical Calculation ◽  
Open Pit ◽  
Winkler Foundation ◽  
Beam Model ◽  
Mining System ◽  
Static Loads ◽  
Pillar Stability ◽  
Highwall Mining

Abstract The highwall miner can be used to mine the retained coal in the end slope of an open-pit mine. However, the instability mechanism of the reserved rib pillar under dynamic and static loads is not clear, which restricts the safe and efficient application of the highwall mining system. In this study, the load-bearing model of the rib pillar in highwall mining was established, the cusp catastrophe theory and the safety coefficient of the rib pillar were considered, and the criterion equations of the rib pillar stability were proposed. Based on the limit equilibrium theory, the limit stress of the rib pillar was analyzed, and the calculation equations of plastic zone width of the rib pillar in highwall mining were obtained. Based on the Winkler foundation beam theory, the elastic foundation beam model composed of the rib pillar and roof under the highwall mining was established, and the calculation equations for the compression of the rib pillar under dynamic and static loads were developed. The results show that with the increase of the rib pillar width, the total compression of the rib pillar under dynamic and static loads approximately decreases in an inverse function, and the compression of the rib pillar caused by static loads of the overlying strata and trucks has a decisive role. Numerical simulation and theoretical calculation were performed in this study. In the Numerical simulation, the coal seam with a buried depth of 122 m and a thickness of 3 m was mined by the highwall miner. According to the established rib pillar instability model of the highwall mining system, it is found that when the mining tunnel width is 3 m, the reasonable width of the rib pillar is at least 1.3 m, and the safety factor of the rib pillar is 1.3. The numerical simulation results are in good agreement with the results of theoretical calculation, which verifies the feasibility of the theoretical analysis of the rib pillar stability. The research results can provide an important reference for the stability analysis of rib pillars under highwall mining.

Inner Force Analysis of Two Typical Frames with Vertical Displacement

2008 ◽  
Vol 400-402 ◽  
pp. 341-346
Author(s):  
Wei Zhou
Keyword(s):  
External Load ◽  
Bending Moment ◽  
Simple Calculation ◽  
Basic Structure ◽  
Vertical Displacement ◽  
Internal Force ◽  
Moment Redistribution ◽  
Calculation Results ◽  
Vertical Chain ◽  
Force Calculation

Finite element method is often used to obtain exact solution in the course of internal force calculation of some complex frames which contain nodal vertical displacement such as frames with transferring layer and mega-frames with sub-structure. In the phase of scheme comparison and schematic design, methods which can quickly produce calculation results of the above said frameworks are necessary. Based on the basic principle of displacement method, this paper proposes a simple analytical method for frameworks that contain nodal vertical displacement. According to the proposal, the basic structure for calculation is the framework in which is added vertical chain-pole at relevant node; the basic unknown quantities are the nodal vertical displacement of the basic structure; the basic equation is fixed according to the equilibrium of node forces; unit vertical displacement as well as bending moment and shear diagram of the basic structure under external load are respectively obtained by using moment redistribution method; nodal vertical displacement is determined through substitution of shear force of relevant rod into the equilibrium equation of the chain-pole node; the actual internal force is determined through superposition of actual vertical displacement and internal force diagram algebra of the basic structure under vertical external load. An engineering example is introduced, which is intended to provide reference for the simple calculation for the above said complex frameworks.

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