Research on the Calculation Method of Vertical Seismic Capacity of the Multi-Ribbed Composite Slab

2010 ◽  
Vol 152-153 ◽  
pp. 1873-1877
Author(s):  
Qi Zhang ◽  
Qian Feng Yao ◽  
Yin Zhang ◽  
Wei Huang ◽  
Dong Bo Li
Keyword(s):  
Theoretical Calculation ◽  
Bearing Capacity ◽  
Influence Factors ◽  
Element Model ◽  
Paper Analysis ◽  
Engineering Practice ◽  
Calculation Formula ◽  
Seismic Capacity ◽  
Depth Analysis ◽  
Vertical Bearing

On the basis of experimental study on 5 standard slabs’ vertical bearing capacity, the paper makes an in-depth analysis on the ratio of axial compression stress to strength, the ratio of height to thickness and the influence of embedded block on the axial bearing capacity of the slabs. By establishing finite element model of the slab, the paper analysis the influence factors by means of numerical simulation and establishing the theoretical calculation formula of the slab. Compared with the experimental results, it is showed that the accuracy of the theoretical calculation formula can meet the practical requirements, which provides theoretical calculation basis for engineering practice.

Research and Analysis about Partical Compression for Individual Anchored Prestressed End Strength

2013 ◽  
Vol 395-396 ◽  
pp. 841-844
Author(s):  
Ping Pang
Keyword(s):  
Reinforced Concrete ◽  
Theoretical Calculation ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Calculation Formula ◽  
Concrete Member ◽  
Concrete Members ◽  
Standard Formula ◽  
Reinforced Concrete Member ◽  
Measured Load

According to the specification given, the theoretical calculation formula of the theoretical value is higher than the measured load values. Specifications given by the bureau of compressive bearing capacity formula is suitable for ordinary reinforced concrete member. For prestressed concrete members, especially scattered end anchorage of prestressed concrete member, the standard formula is not applicable.

Design and Bearing Capacity Study of Multi-Wing Branch Pile

2011 ◽  
Vol 243-249 ◽  
pp. 1311-1315
Author(s):  
Ying Li Liu ◽  
Chun Miao Li
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
Design Process ◽  
Scientific Research ◽  
Engineering Practice ◽  
Single Pile ◽  
Calculation Formula ◽  
Basic Principles

This paper describes the characteristics and construction processes of Multi-winged branches pile, it also introduces the basic principles and considerations should be followed in the design process by analyzing the mechanical properties of Multi-winged branches pile, and summarizes the calculation formula of bearing capacity for the single pile. This formula is suitable for Multi-winged branches pile and it can provide the reference for scientific research and engineering practice.

The Grouting Bored Pile Perfusing Pile Bearing Capacity after Effect Factors of the Finite Element Analysis

2012 ◽  
Vol 461 ◽  
pp. 351-354
Author(s):  
Shao He Li ◽  
Qun Xian Lin
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Bearing Capacity ◽  
Influence Factors ◽  
Element Model ◽  
Model Parameters ◽  
Single Pile ◽  
Element Analysis ◽  
Bored Pile ◽  
After Effect

This article take the Zhejiang some project engineering geology condition as a background, Through comparative analysis with single pile load, determine the model parameters of ANSYS finite element, The ANSYS finite element model of single pile, Respectively on the Grouting pile and Grouting for grouting of pile modulus change and Grouting in body size and changes of modulus of pile-end soils and a series of comparative analysis of the situation and analysis on bearing capacity of bored pile tip Grouting influence factors and of the main causes, draw some useful conclusions.

Study of Failure Modes of Suction Anchors

2011 ◽  
Author(s):  
Qiyi Zhang ◽  
Sheng Dong
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Failure Mode ◽  
Failure Modes ◽  
Limit Equilibrium ◽  
Element Model ◽  
Ultimate Bearing Capacity ◽  
Engineering Practice ◽  
Element Analysis ◽  
Limit Equilibrium State

Suction foundations are widely used in deep sea and their ultimate bearing capacity which is closely related with failure modes of suction anchor at limit equilibrium state is a key technology in offshore engineering practice. Based on Coulomb friction theory, an exact finite element model is presented in this paper. On the basis of this FEM model, by use of the finite element analysis software ABAQUS, the effect of mooring point and aspect ratio of a suction anchor on the ultimate bearing capacity and its stability are researched in detail. The results show that the ultimate bearing capacity and stability of the suction anchor are affected vastly by the position of mooring point, and the variation of mooring point on the suction anchor can lead to different failure modes. Simultaneously, the results also shows that tilted rotation of the soil along the direction of the mooring force will occur when the mooring point is near the top of the suction anchor, and the soil near the bottom of the fixed anchor rotates around the center of a circle, so the failure mode is called forward-tilted rotation in this paper; A general translation slip of the soil in front of the anchor along the direction of the mooring force will occur when mooring point is below midpoint of suction anchor, so the failure mode is called the translation slip failure mode in this paper. Anticlockwise tilted rotation of the soil along the direction of mooting force will occur when the mooring point is near the bottom of the anchor, and the soil at the top of the anchor rotates around the center of a circle, so the failure mode is called backward-tilted rotation in this paper.

A Study on the Failure Mechanism of Suction Caisson under Vertical Load

2012 ◽  
Vol 256-259 ◽  
pp. 1985-1989
Author(s):  
Shu Cheng Jin ◽  
Yong Tao Zhang ◽  
Qi He Wu
Keyword(s):  
Bearing Capacity ◽  
Failure Mechanism ◽  
Offshore Structures ◽  
Engineering Practice ◽  
Vertical Load ◽  
Suction Caisson ◽  
Methods Of Evaluation ◽  
New Type ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

As a new type of deep water offshore foundation, suction caisson is widely used to offshore structures. However, the current methods of evaluation and design cannot meet the increasing requirement of engineering practice. In this dissertation, the studies are emphasized on finite element method for analyzing the suction caisson bearing capacity behavior and the failure mechanism under the vertical load. Based on studying the vertical bearing behavior of caissons with different ratio of length to diameter L / D, it shown that as L / D increases, the vertical bearing capacity growth slowed.

Design and Numerical Simulation of High Strength Lightweight RPC Pole

2020 ◽  
Vol 984 ◽  
pp. 245-251
Author(s):  
Fang Da Fu ◽  
Lu Liang Wang ◽  
Hai Long Zhao ◽  
Jun Feng Bai ◽  
Xu Dong Zhou ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Calculation ◽  
High Strength ◽  
Element Model ◽  
Reactive Powder Concrete ◽  
Calculation Formula ◽  
Analysis Software ◽  
Element Analysis ◽  
Reactive Powder

In this paper, finite element model of reactive powder concrete (RPC) pole was established by using finite element analysis software ABAQUS, and the strength of RPC pole was checked. The results of finite element analysis and theoretical calculation are compared to provide a basis for determining the parameters used in finite element modeling and revising the theoretical calculation formula.

A SIMPLIFIED ANALYTICAL PROCEDURE FOR SEISMIC ANALYSIS OF TIMBER LIGHT-FRAME SHEAR WALLS

2019 ◽  
Vol 3 (Special Issue on First SACEE'19) ◽  
pp. 173-180
Author(s):  
Giorgia Di Gangi ◽  
Giorgio Monti ◽  
Giuseppe Quaranta ◽  
Marco Vailati ◽  
Cristoforo Demartino
Keyword(s):  
Analytical Procedure ◽  
Seismic Analysis ◽  
Shear Walls ◽  
Element Model ◽  
Sensitivity Analyses ◽  
Width Ratio ◽  
Damping Factor ◽  
Equivalent Viscous Damping ◽  
Design Variables ◽  
Depth Analysis

The seismic performance of timber light-frame shear walls is investigated in this paper with a focus on energy dissipation and ductility ensured by sheathing-to-framing connections. An original parametric finite element model has been developed in order to perform sensitivity analyses. The model considers the design variables affecting the racking load-carrying capacity of the wall. These variables include aspect ratio (height-to-width ratio), fastener spacing, number of vertical studs and framing elements cross-section size. A failure criterion has been defined based on the observation of both the global behaviour of the wall and local behaviour of fasteners in order to identify the ultimate displacement of the wall. The equivalent viscous damping has been numerically assessed by estimating the damping factor which is in use in the capacity spectrum method. Finally, an in-depth analysis of the results obtained from the sensitivity analyses led to the development of a simplified analytical procedure which is able to predict the capacity curve of a timber light-frame shear wall.

Lamellar Tearing Observations Regarding the Application of European Standards in the Field of Welded Steel Constructions

2018 ◽  
Vol 69 (6) ◽  
pp. 1352-1354
Author(s):  
Anamaria Feier ◽  
Oana Roxana Chivu
Keyword(s):  
Bearing Capacity ◽  
Brittle Failure ◽  
Engineering Practice ◽  
Steel Bridge ◽  
Railway Bridge ◽  
Welded Steel ◽  
Direct Replacement ◽  
Lamellar Tearing ◽  
European Standards ◽  
Comprehensive Study

The problem of corrosion for old steel bridges in operation is often solved by direct replacement of elements or structure. Only a few studies have been done to determine the efforts influenced by corrosion in those elements. In general, it is considered that a corroded element has exceeded the bearing capacity and should be replaced, but if the corroded element is secondary it could be treated and kept. A factor in the rehabilitation of an old steel bridge in operation is the aspect of structure. If the structure is corroded, rehabilitation decision is taken is easier. Lamellar tearing describes the cracking that occurs beneath the weld and can be characterized as a brittle failure of steel, in the direction perpendicular to the plane of rolling. The paper presents a comprehensive study on lamellar tearing and summarizes some conclusions about the prevention of them. The conclusions will be exemplified in the case of a railway bridge, with a main truss girder. The paper presents also some observations regarding the stress analysis in fillet welds, resulting from the engineering practice.

scholarly journals Characteristics Analysis and Modelling of a Pneumatic Underwater Launching System

2018 ◽  
Vol 232 ◽  
pp. 02005
Author(s):  
Bin Li ◽  
Song Guo ◽  
Wei Li ◽  
Deman Zhang ◽  
Nei Wang
Keyword(s):  
Theoretical Calculation ◽  
Calculation Formula ◽  
Numerical Work ◽  
Characteristics Analysis ◽  
Hydrodynamic Noise

Comprehensive characteristics of a pneumatic underwater launching system were analyzed and the simulation was carried out by simulink. The components of the pneumatic underwater launching system were introduced, and the theoretical calculation formula for the system was derived. A rated pressure of 3.5MPa and 5MPa was offered in the numerical work. Analyses in different piston height show good behaviors: Proper increase of piston-initial accumulator pressure is beneficial to reduce hydrodynamic noise, choose the appropriate pressure of accumulator. The hydrodynamic noise of the system can be significantly reduced by optimizing the structure of the double-acting cylinder, increasing the height of the piston and improving the structure of the piston.

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