Analysis of Internal Force and Deformation for Pit Retaining Structure by Considering the Interaction of Pile Stiffness

2013 ◽  
Vol 838-841 ◽  
pp. 397-401
Author(s):  
Ming Li ◽  
Ren Wang Liang
Keyword(s):  
Finite Difference ◽  
Engineering Design ◽  
Axial Force ◽  
Influence Factors ◽  
Bending Moment ◽  
Internal Force ◽  
Equivalent Stiffness ◽  
Deep Excavation ◽  
Retaining Structure ◽  
Design Software

In this paper, taking one deep excavation engineering as an example, modeling by the FLAC3D finite difference software, combining with the Lizheng deep excavation supporting design software, taking the equivalent stiffness of combination pile as 2.300-4.789(10-2m3), and analyzing the pile body bending moment, anchor axial force and pit deformation by considering interaction of pile stiffness. In addition, in this paper the influence factors of pile stiffness has been discussed, and provides a reference for the engineering design.

scholarly journals Internal Force Analysis of Parabolic Arch Considering Shear Effect under Gradient Temperature

2021 ◽  
Vol 631 (1) ◽  
pp. 012053
Author(s):  
Fulin Shen ◽  
Xiaochun Song
Keyword(s):  
Temperature Gradient ◽  
Axial Force ◽  
Slenderness Ratio ◽  
Bending Moment ◽  
Internal Force ◽  
Gradient Field ◽  
Parameter Study ◽  
Linear Temperature ◽  
Linear Temperature Gradient ◽  
Parabolic Arch

Abstract This paper theoretical analysis the internal force of the fixed parabolic arches under radient temperature gradient field incorporating shear deformations. The effective centroid of the arch-section under linear temperature gradient is derived. Based on force method and energy method, the analytical solutions of the internal force of fixed parabolic arches at pre-buckling under linear temperature gradient field are derived. A parameter study was carried out to study the influence of linear temperature gradient on the internal force of the fixed parabolic arches with different rise-span ratio and varying slenderness ratio. It is found that the temperature gradient and the rise-span ratio has a significant influence on the internal force of the parabolic arches, the influence of shear deformation causes the bending moment increase while the axial force decreases, and the axial force of parabolic arches decreases as the rise-span ratio increases.

Nonlinear Behaviour of Equivalent Stiffness of Plates Clamped by Bolted Joints Under Loading

2009 ◽  
Author(s):  
Tomohiro Naruse ◽  
Yoji Shibutani
Keyword(s):  
Axial Load ◽  
Bending Moment ◽  
Internal Force ◽  
Bolted Joints ◽  
Axial Stiffness ◽  
Nonlinear Behaviour ◽  
Equivalent Stiffness ◽  
Contact Conditions ◽  
Linear Behaviour ◽  
Load Displacement

The equivalent stiffness of clamped plates is needed not only to evaluate the strength of bolted joints but also to estimate the deformation and vibration characteristics of practical structures with many bolted joints. The axial stiffness and bending stiffness of clamped plates were estimated using finite element (FE) analyses while taking the contact conditions on bearing surfaces and between plates into account. We constructed FE models with an M10 bolt and plate thicknesses of 3.2, 4.5, 6.0, or 9.0 mm, and subjected them to an axial load and a bending moment. The axial compliance was estimated using the load-displacement relation obtained from the FE results. When the axial load was lower than 110% of the clamping force, the load-displacement relation showed linear behaviour and the axial compliance was almost constant. When the axial load was higher than that, the axial compliance varied nonlinearly with changes in the contact conditions between clamped plates. The compliances of the clamped plates were compared with those specified in the German engineering society code VDI 2230 (2003), in which equivalent conical compressive stress fields in the plates had been assumed. When the load-displacement relation behaves linearly, the axial and bending compliances obtained in FE analysis can basically be expressed by the VDI 2230 (2003) code. However, this code gives the slightly large axial stiffness, and thus the internal force borne to the bolt is predicted in a little bit unsafe estimation. In addition, the code is not suitable for application in the case of clamped plates with different thicknesses due to the assumptions it makes with respect to models.

The Finite Element Analysis on Mechanical Properties of the Meridians Stair Skeleton of Medical Exhibition Center in Taizhou City

2011 ◽  
Vol 147 ◽  
pp. 140-144
Author(s):  
Jia Zhu Xue ◽  
Yv Zhang Chi ◽  
Xiang Cao Zhi
Keyword(s):  
Finite Element ◽  
Axial Force ◽  
Engineering Application ◽  
Bending Moment ◽  
Steel Structure ◽  
Internal Force ◽  
Mechanical Transmission ◽  
Element Analysis ◽  
Standard Requirement ◽  
Skeleton Structure

The alien space meridians stair steel structure is first adopted in Taizhou medical city exhibition center project. Based on the finite element calculation method for curved beam element stiffness matrix, convergence standard controls and iteration method of solving the modification and optimization in this paper, the complex alien space meridians framed calculation model is built, and the distribution of axial force and bending moment distribution of the stairs meridians skeleton structure are calculated, and the position and numbers are determined. Numerical results show that the maximum space alien meridians stair axial force is 34.5 KN and maximum bending moment is 5.9 KN•m, which satisfy the standard requirement, then the size curvature big, mechanical transmission line complex and local internal force big technology problem skeleton structure have been solved .Therefore, a strong engineering application value achieves in this paper.

Research on Internal Force Analysis of Shaking Table Test for Prestressed Pipe Piles Used in Tang Shan-Cao Feidian Expressway

2013 ◽  
Vol 740 ◽  
pp. 750-754
Author(s):  
Huan Sheng Mu ◽  
Ling Gao ◽  
Yu Guo Liang ◽  
Wen Dong Ma
Keyword(s):  
Axial Force ◽  
Shaking Table Test ◽  
Bending Moment ◽  
Internal Force ◽  
Sine Wave ◽  
Shaking Table ◽  
Pile Diameter ◽  
Pipe Model ◽  
Table Model ◽  
The Moment

In order to study the applicability of pipe piles in Tang-Cao expressway, shaking table model test was carried out. The results shows that, the internal force distribution of the pile under the action of seismic wave is basically the same with the behavior that is under the action of sine wave ; in the position of the 4 times pile diameter (distance the top of the pipe model about 200mm) appears the maximum axial force and bending moment; the change of the additional axial force in the upper portion of the pile is more complex, and tends to increase downward; the change of the moment tends to stable blow the distance of 20times the pile diameter from the pile top (distance the top of pipe model about 1000mm)

scholarly journals Preliminary Numerical Analysis of a Novel Retaining System in Dry Sandy Soil and Its First Application to a Deep Excavation in Wuhan (China)

2020 ◽  
Vol 10 (6) ◽  
pp. 2006
Author(s):  
Yapeng Zhang ◽  
Congxin Chen ◽  
Meiqing Lei ◽  
Yun Zheng ◽  
Haina Zhang ◽  
...  
Keyword(s):  
Numerical Study ◽  
Bending Moment ◽  
Bending Moments ◽  
Deep Excavation ◽  
Retaining Structure ◽  
Real World Application ◽  
New Form ◽  
Batter Piles ◽  
Levels Of Support ◽  
New System

A new form of retaining system for use in deep excavations in crowded cities is proposed in this paper. The new system, which we have coined the herringbone retaining system (HRS) involves the use of vertical and batter piles, capping beams, and wales. A numerical study was conducted (using the finite difference tool FLAC3D) to investigate various aspects of the behavior of the new system and reveal the mechanisms responsible for it. The HRS method was compared subsequently to two other commonly-used systems: the cantilever retaining structure (CRS) and horizontal-strutted retaining structure (HSRS). The results show that using the HRS method significantly reduces the deformation of the vertical piles and bending moments acting on them. More specifically, the maximum values of the deformation and bending moment were calculated to be 4.5% and 23.1% of the corresponding CRS values, respectively (the corresponding figures calculated for the HSRS method are 5.3% and 19.7%, respectively), so the HRS and HSRS methods provide similar levels of support. Finally, a real-world application of the system was presented to provide a valuable reference for the future use of HRS.

Engineering Design and Analysis for Four-Legged Steel Trellis Column

2010 ◽  
Vol 44-47 ◽  
pp. 1500-1504
Author(s):  
Jian Bin Chen ◽  
Hai Jun Xue
Keyword(s):  
Engineering Design ◽  
Design Process ◽  
Design Method ◽  
Bending Moment ◽  
Internal Force ◽  
Axial Pressure ◽  
Length Width ◽  
The Stability ◽  
Force Calculation

In this paper, the design process of the four-legged steel trellis column is introduced for an actual project. The internal force calculation including of axial pressure and bidirectional bending moment are discussed. The strength and stability satisfy the requisition by code. Confirm that the stability of sub pillar is key element for design of trellis column. The simulations show that the design method is safety and reasonable by STAAD.pro software. Different gridding is chosen based on length, width and thickness of members; excess larger or smaller gridding is improper. The conclusions and methods can be referred by later engineering.

Analysis of Dynamic Characteristics of Pile-Soil Coupling Effect in Consideration of Large Span Cable-Stayed Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1270-1273
Author(s):  
Wen Yuan Chen
Keyword(s):  
Axial Force ◽  
Soil Structure ◽  
Coupling Effect ◽  
Reaction Force ◽  
Bending Moment ◽  
Internal Force ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Pile Cap ◽  
Force Calculation

Using the viscouselastic artificial boundary, three conditions of long-span cable-stayed bridge are analyzed,such as pile cap consolidation, pile - structure and pile soil structure interaction. Natural frequency of bridge of pile - soil - structure coupling becomes small and cycle becomes long. The pile bottom reaction force decreased obviously, at the same time, the axial force , bending moment, axial force of cable, tower of axial force and bending moment is also reduced significantly. Cable-stayed bridge is a special flexible structure, so, static internal force calculation in the tower bottom consolidation pattern is safe, but the value is too large.

Research on the Bearing Capacity of Double Row Steel Sheet Pile Reinforcement Depth of the Based on Soil between Piles

2016 ◽  
Vol 25 ◽  
pp. 127-132
Author(s):  
Sun Hui
Keyword(s):  
Steel Sheet ◽  
Bending Moment ◽  
Element Model ◽  
Internal Force ◽  
Soil Reinforcement ◽  
Sheet Pile ◽  
Double Row ◽  
Peak Displacement ◽  
Retaining Structure ◽  
Before And After

With the complex force characteristics of double row steel sheet pile retaining structure. Through the PLAXIS 3D finite element model is established, the soil with HS-Small constitutive model, the cement soil reinforcement of double row steel sheet pile support retaining structure of pile soil, the simulation and analysis of the soil between piles reinforcement depth of double row steel sheet piles by the force and displacement. Analysis shows that with the increase of reinforcement depth:1） before and after the peak displacement of two rows of steel sheet pile becomes smaller; 2）outside row of pile axial force variation trend of different;3） outside row of steel sheet pile peak shear force and bending moment increases first and then decreases; 4）the peak reached maximum value when the reinforcement depth have different; 5）internal row pile internal force of absolute value was significantly larger than that of the outer row of piles, should according to the actual needs of the project using the appropriate reinforcement depth.

Monitoring and Analysis of a Deep Excavation in Hefei

2014 ◽  
Vol 1021 ◽  
pp. 91-95
Author(s):  
Xiao Qiang Wang ◽  
Li Jun Zhao
Keyword(s):  
Axial Force ◽  
Deep Excavation ◽  
Retaining Structure ◽  
Design Construction ◽  
Horizontal Support

A deep excavation in Hefei is proposed in this paper. Some useful conclusions are drawn through the analysis of the measured results including displacement of retaining structure, axial force of horizontal support and settlement of the surrounding buildings. It is useful for design, construction of similar engineering.

Simplified Method for Estimating the Inner Support and Internal Force through Stand Column Uplift of Foundation Pit in Soft Soil

2014 ◽  
Vol 580-583 ◽  
pp. 474-480
Author(s):  
Yan Liu ◽  
Jun Yan Liu ◽  
Tao Liu
Keyword(s):  
Soft Soil ◽  
Influence Factors ◽  
Bending Moment ◽  
Internal Force ◽  
Calculation Model ◽  
Practical Calculation ◽  
Foundation Pit ◽  
Excavation Process ◽  
Simplified Calculation ◽  
Main Influence

In the excavation process of Foundation Pit in Soft Soil area, it will cause the large uplift of stand column, and may cause the instability and failure of foundation pit in case of being serious; but the additional internal force of support system caused by the uplift and sinking of stand column currently has no practical calculation model in the foundation pit design. This article discusses the reason and mechanism for uplift of stand column in the foundation pit, proposes the simplified calculation method of estimating the additional bending moment of inner support through uplift of stand column in allusion to two main influence factors of bottom heave and vertical load caused by the excavation of foundation pit, inversely calculates the permissible additional bending moment of inner support based on this, verifies by combining the monitoring data for uplift of stand column in the actual project, and finally, further proposes the project measures corresponding to the uplift of stand column, hoping to provide beneficial reference for the similar project.

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