scholarly journals Specified Domain in Nu-Mu Interaction Diagram for Logical Judgment in Numerical Analysis on Compression Reinforced Concrete Members

2014 ◽  
Vol 8 (1) ◽  
pp. 400-405
Author(s):  
Yingjie Jia ◽  
Peng Chang ◽  
Jing Sun
Keyword(s):  
Numerical Analysis ◽  
Eccentric Load ◽  
Reinforcement Scheme ◽  
Interaction Diagram ◽  
Concrete Members ◽  
Load Combination ◽  
Steel Consumption ◽  
Section Design ◽  
Physical Information ◽  
Varied Reinforcement

A series of specified domains in Nu-Mu interaction diagram are proposed to determine optimal reinforcement schemes for rectangular RC column sections subjected to uniaxial eccentric load. These domains divide the area covered by interaction diagram into four regions of safety zone, compression-controlled zone, balanced failure zone and tensioncontrolled zone, which can help engineer to understand all possibilities of section failure under varied reinforcement scheme when they carried out a section design for columns with numerical analysis. With the physical information included in the diagram, the domains help to establish logical judgment between practical reinforcement schemes specified by the Chinese code (GB50010-2010) and corresponding load combination (Nu, Mu) in interaction diagram, and also provide physical interpretation on any calculated result of steel consumption.

Reliability Calibration of a Waves–Icebergs Interaction Load Combination Factor

2004 ◽  
Author(s):  
Ricardo O. Foschi ◽  
Michael Isaacson ◽  
Norman Allyn
Keyword(s):  
Numerical Analysis ◽  
Offshore Structures ◽  
Combined Effects ◽  
Limit States ◽  
Sea State ◽  
Load Effect ◽  
Design Load ◽  
Load Combination ◽  
Wave Parameters ◽  
Design And Construction

The Canadian Standards Association [1] has developed and published a code for the design and construction of fixed offshore structures. One of the limit states relates to the combined effects of waves and iceberg collision loading. The Code uses a load combination factor to determine the design load effect. The present paper describes a recent study on the appropriateness of the recommended value of the combination factor. The study involves a numerical analysis in which loads have been calculated, at different probability levels, for a range of iceberg and wave parameters, considering waves alone, an iceberg alone, and an iceberg and waves in combination. The paper thereby makes recommendations for the load combination factor as a function of iceberg and sea state parameters.

scholarly journals Study on Deep and Large Foundation Pit of a National First-Class Key Tomb Protection Project

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jiagang Zhang ◽  
Zhimin Chen ◽  
Mingzhu Hu ◽  
Zhaoguo Wu
Keyword(s):  
Numerical Analysis ◽  
Large Range ◽  
Retaining Wall ◽  
Bending Moment ◽  
Foundation Pit ◽  
Reinforcement Scheme ◽  
Bored Pile ◽  
Maximum Value ◽  
The Stability ◽  
Support Engineering

For the support engineering of the deep and large foundation pit (DLFP) due to tomb protection, there are still no clear standards. The construction of DLFP will introduce large-range transverse and longitudinal disturbance on the stratum; therefore, it should be reinforced. In this paper, the reinforcement of the deep and large foundation pit of a national first-class key tomb protection project is studied. By comparing the existing supporting scheme and the stress conditions of the reinforced tomb, the combination reinforcement scheme by bored pile and pile slab retaining wall is found to be safe and feasible. Furthermore, according to the simulated bending moment, displacement, and axial force of the tomb by numerical analysis, an economic and reasonable mixed anchor support scheme is selected. In order to ensure the stability of the tomb during the supporting process of the foundation pit, a maximum value of 10 mm for the overall settlement of the tomb can be treated as the control benchmark based on the support and anchorage schemes in each specification and the in-site measured settlement values of the tomb. The determined support, anchorage schemes, and the control benchmark can provide certain technique guidance and research significance for the protection of similar ancient buildings in the future.

Combined wave – iceberg loading on offshore structures

1996 ◽  
Vol 23 (5) ◽  
pp. 1099-1110 ◽  
Author(s):  
Ricardo Foschi ◽  
Michael Isaacson ◽  
Norman Allyn ◽  
Steven Yee
Keyword(s):  
Numerical Analysis ◽  
Offshore Structures ◽  
Wave Forces ◽  
Combined Effects ◽  
Ocean Engineering ◽  
First Order ◽  
Load Combination ◽  
Wave Parameters ◽  
Annual Probability ◽  
Verification Process

The Canadian Standards Association has developed and published a code for the design and construction of fixed offshore structures. This code has been subjected to a comprehensive verification process which has identified several issues warranting further study. One of these relates to the combined effects of wave and iceberg collision loading. At present, this combination is treated by the use of a load combination factor specified in the Code. The present paper describes a recent study which was undertaken to determine the appropriateness of the recommended value of the load combination factor. The study involves a numerical analysis in which loads due to waves alone, an iceberg alone, and an iceberg and waves in combination have been calculated for a range of iceberg and wave parameters. These results have been applied to a first-order reliability analysis in order to study the force levels corresponding to an annual probability of 10−4 or to the onset of global sliding with an annual probability of 10−4. The paper thereby makes recommendations for load combination factors applicable to combined wave–iceberg loading. Key words: hydrodynamics, icebergs, ocean engineering, offshore structures, wave forces, waves.

Fatigue of Combined Drag and Inertial Forces

2014 ◽  
Author(s):  
Wenbo Huang
Keyword(s):  
Numerical Analysis ◽  
Fatigue Damage ◽  
High Frequency ◽  
Low Frequency ◽  
Inertial Force ◽  
Frequency Domain Method ◽  
Inertial Forces ◽  
Combined Load ◽  
Drag Forces ◽  
Load Combination

Based on the rain-flow counting technique, a frequency domain method is developed for calculating the fatigue damage caused by the combined drag and inertial loads. Firstly, by observation of the combined signal simulated, the combined load can be considered as the oscillation of the high frequency inertial force around the low frequency drag force with the random amplitudes, which makes it possible to identify the rain-flow large and small cycles. The cyclic range of rain-flow small cycles are determined by considering the reduced effect of the low frequency drag forces on the cyclic range of high frequency inertial forces. The cyclic ranges of rain-flow large cycles are determined by means of Turkstra’s rule of load combination. The numerical analysis show that the damages estimated by the developed method are very close to the rain-flow damages.

Numercial Analysis of Square Steel Tubular Columns Filled with Steel Reinforced Concrete Subjected to Eccentric Load

2012 ◽  
Vol 446-449 ◽  
pp. 922-925
Author(s):  
Guo Feng Yu ◽  
Xu Dong Zhao ◽  
Hai Yu Sui
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Bearing Capacity ◽  
Analysis Program ◽  
Analysis Method ◽  
Eccentric Load ◽  
Steel Reinforced Concrete ◽  
Numerical Analysis Method ◽  
Tubular Columns

This paper developed numerical analysis program. Results agree well with the tested ones.So the numerical analysis method can be used to estimate the bearing capacity and deformation.

scholarly journals Verifying the Shear Load Capacity of Masonry Walls by the V Rd–N Ed Interaction Diagram

2021 ◽  
Vol 1203 (2) ◽  
pp. 022031
Author(s):  
Radosław Jasiński
Keyword(s):  
Cross Section ◽  
Load Capacity ◽  
Shear Walls ◽  
Horizontal Wind ◽  
Masonry Walls ◽  
Shear Load ◽  
Vertical Load ◽  
Interaction Diagram ◽  
Load Combination ◽  
Load Carrying

Abstract Verification of shear load capacity is required for all shear walls that take horizontal wind loads, loads imposed by ground action or other non-mechanical (rheological or thermal) loads. Shear walls are exposed not only to shear forces, but also vertical actions caused by dead load or imposed loads as shear walls also usually function as bearing walls. This load combination is quite important as shear load capacity V Rd depends on mean design stresses σd which, in turn, depend on design forces N Ed. Interactions between shear V Rd and vertical load N Ed in shear walls are the consequence of observed combinations of actions in these types of walls. Additionally, the vertical load N Ed acts on the wall at certain eccentricity eEd, which can result in a change in the length of the compressed part of the cross-section l c. This paper describes the procedure for verifying shear load capacity by means of the interaction diagram drawn as specified in Eurocode 6 (prEN 1996-1-1:2017). Necessary equations for determining load-carrying capacity of cross-section against vertical load N Ed were worked out. The effect of wall shape and eccentricity of vertical load on the shape of the interaction diagram was analysed.

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