scholarly journals Forecasting of excavation problems for high-rise building in Vietnam using planet optimization algorithm

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thanh Sang-To ◽  
Minh Hoang-Le ◽  
Samir Khatir ◽  
Seyedali Mirjalili ◽  
Magd Abdel Wahab ◽  
...  
Keyword(s):  
Optimization Algorithm ◽  
Field Data ◽  
Source Code ◽  
Horizontal Displacement ◽  
Soil Parameters ◽  
Engineering Practice ◽  
Engineering Software ◽  
High Rise ◽  
Complex Calculation ◽  
Early Phases

AbstractIn this paper, a new method in forecasting the horizontal displacement of diaphragm wall (D.W.) for high-rise buildings is introduced. A new stochastic optimizer, called Planet Optimization Algorithm (P.O.A.), is employed to assess how proper finite element (F.E.) simulation is against field data. The process is adopted for a real phased excavation measured at the field. To automatically run the iterative optimization tasks, a source code is constructed directly in the Geotechnical Engineering Software (PLAXIS) by using Python to ensure that the operation between optimization algorithm and F.E. simulations are smooth to guarantee the accuracy of the complex calculation for the soil problem. The proposed process consists of two steps. (1) The parameters will be optimized at the early phases of the excavation. (2) The responses of D.W. displacements are forecasted at the subsequent phases. The aim of the process is to predict the displacements of D.W. of the building from the result of the nearby excavation or to provide early warning about the risks of excavation that may happen under vital phases. The proposed procedure also provides an effective method for optimization-based soil parameters updating in real engineering practice.

scholarly journals Monitoring and Analysis of Dynamic Characteristics of Super High-rise Buildings using GB-RAR: A Case Study of the WGC under Construction, China

2020 ◽  
Vol 10 (3) ◽  
pp. 808 ◽  
Author(s):  
Lv Zhou ◽  
Jiming Guo ◽  
Xuelin Wen ◽  
Jun Ma ◽  
Fei Yang ◽  
...  
Keyword(s):  
Wavelet Analysis ◽  
Dynamic Characteristics ◽  
Horizontal Displacement ◽  
Dynamic Monitoring ◽  
High Rise ◽  
The North ◽  
Study Results ◽  
Under Construction ◽  
East West

Accurate dynamic characteristics of super high-rise buildings serve as a guide in their construction and operation. Ground-based real aperture radar (GB-RAR) techniques have been applied in monitoring and analyzing the dynamic characteristics of different buildings, but only few studies have utilized them to derive the dynamic characteristics of super high-rise buildings, especially those higher than 400 m and under construction. In this study, we proposed a set of technical methods for monitoring and analyzing the dynamic characteristics of super high-rise buildings based on GB-RAR and wavelet analysis. A case study was conducted on the monitoring and analysis of the dynamic characteristics of the Wuhan Greenland Center (WGC) under construction (5–7 July 2017) with a 636 m design height. Displacement time series was accurately derived through GB-RAR and wavelet analysis, and the accuracy reached the submillimeter level. The maximum horizontal displacement amplitudes at the top of the building in the north–south and east–west directions were 18.84 and 15.94 mm, respectively. The roof displacement trajectory of the WGC was clearly identified. A certain negative correlation between the temperature and displacement changes at the roof of the building was identified. Study results demonstrate that the proposed method is effective for the dynamic monitoring and analysis of super high-rise buildings with noninvasive and nondestructive characteristics.

Study on the Stratum Displacement Changes Caused by the Vertical Shaft Construction in Saturated Ultra Soft Soil

2012 ◽  
Vol 170-173 ◽  
pp. 1005-1012
Author(s):  
Lin You Pan ◽  
Xiao Bing Li ◽  
Chuang Yu ◽  
Fu Xue Sun
Keyword(s):  
Soft Soil ◽  
Field Tests ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Soil Disturbance ◽  
Soil Parameters ◽  
Finite Element Software ◽  
Total Displacement ◽  
Calculation Results ◽  
Engineering Information

In view of Wenzhou saturated super soft soil, This article studied the influence of different soil parameters for the shaft excavation construction and the stratum displacement change law by using Plaxis finite element software, according to the data obtained in field tests. The considered factors included the lateral brace stiffness, the stiffness of the underground diaphragm wall, and the surrounding soil disturbance. The calculation results provided much important engineering information, such as the horizontal displacement nephogram, the vertical displacement nephogram and the total displacement incremental vector diagram of each construction steps, which can be referred for the construction of the similar underground projects in soft soil areas.

Shortcut Method for Pipe Expansion Loop Sizing

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Nikola Jaćimović ◽  
Miloš Ivošević
Keyword(s):  
Distribution Systems ◽  
Worked Examples ◽  
Engineering Practice ◽  
Piping System ◽  
Comprehensive Overview ◽  
Approximate Methods ◽  
Proposed Model ◽  
Piping Systems ◽  
Early Phases ◽  
Shortcut Method

Abstract In the engineering practice, it is often necessary to define supporting scheme and expansion loop requirements for piping distribution systems in very early phases of a project. While placing pipe supports is a relatively easy and straightforward task, providing accurate loop locations and dimensions for hot piping systems can often be challenging. In the early phases of any project, it is impractical, costly and time consuming to perform detailed stress analysis of a piping system to provide expansion loop dimensions, and therefore approximate methods are often used. Comprehensive overview of these existing procedures most commonly used in the engineering practice is given in this article. However, the fact is that most of the existing methods are based on the inconvenient charts and tables with scarce background data. Procedure proposed in this article is based on over 150 expansion loop models and provides a simple and accurate analytical method to size and verify piping loops. Two fully worked examples show the simplicity and accuracy of the proposed model and its advantages over the methods typically used in the engineering practice.

scholarly journals Numerical analysis of settlement of a high-rise building using two constitutive soil models

2019 ◽  
Vol 262 ◽  
pp. 04002
Author(s):  
Leszek Chomacki
Keyword(s):  
Numerical Analysis ◽  
Constitutive Models ◽  
Soil Parameters ◽  
Geotechnical Parameters ◽  
High Rise ◽  
High Rise Building ◽  
Perfectly Plastic ◽  
Calculation Process ◽  
Elastic Perfectly Plastic ◽  
Key Parameter

One of the basic roles of foundations is to safely transfer loads from the structure to the subsoil in a controlled manner. Often a key parameter in deciding whether the foundation was designed correctly is the value of settlement of the building and the ground around it. This paper attempts to numerically reproduce the measured settlement of a high-rise building using geotechnical parameters already available. For this purpose, numerical calculations were carried out using two constitutive soil models: the elastic-perfectly plastic model with Mohr-Coulomb plastic criteria (MC) model and the Hardening Soil (HS) model. The resulting settlement values were compared with surveying measurements taken during and after the building’s construction. In the summary the results obtained with the use of different constitutive models, the calculation process and the adopted soil parameters are analysed and discussed.

scholarly journals A new method for interpolating linear features in aeromagnetic data

Geophysics ◽  
2019 ◽  
Vol 84 (3) ◽  
pp. JM15-JM24 ◽  
Author(s):  
Tomas Naprstek ◽  
Richard S. Smith
Keyword(s):  
Field Data ◽  
Interpolation Method ◽  
Source Code ◽  
Synthetic Data ◽  
Aeromagnetic Data ◽  
Derivative Expansion ◽  
Linear Features ◽  
Interpolation Methods ◽  
Minimum Curvature ◽  
Linear Nature

When aeromagnetic data are interpolated to make a gridded image, thin linear features can result in “boudinage” or “string of beads” artifacts if the anomalies are at acute angles to the traverse lines. These artifacts are due to the undersampling of these types of features across the flight lines, making it difficult for most interpolation methods to effectively maintain the linear nature of the features without user guidance. The magnetic responses of dikes and dike swarms are typical examples of the type of geologic feature that can cause these artifacts; thus, these features are often difficult to interpret. Many interpretation methods use various enhancements of the gridded data, such as horizontal or vertical derivatives, and these artifacts are often exacerbated by the processing. Therefore, interpolation methods that are free of these artifacts are necessary for advanced interpretation and analysis of thin, linear features. We have developed a new interpolation method that iteratively enhances linear trends across flight lines, ensuring that linear features are evident on the interpolated grid. Using a Taylor derivative expansion and structure tensors allows the method to continually analyze and interpolate data along anisotropic trends, while honoring the original flight line data. We applied this method to synthetic data and field data, which both show improvement over standard bidirectional gridding, minimum curvature, and kriging methods for interpolating thin, linear features at acute angles to the flight lines. These improved results are also apparent in the vertical derivative enhancement of field data. The source code for this method has been made publicly available.

Inverse Design and Numerical Control Processing of the Little Bear Punch

2014 ◽  
Vol 687-691 ◽  
pp. 113-116
Author(s):  
Ge Zheng ◽  
Chun Wang ◽  
Bo Huang
Keyword(s):  
Geometric Modeling ◽  
Three Dimensional ◽  
Numerical Control ◽  
Inverse Design ◽  
Engineering Practice ◽  
Engineering Software ◽  
Nc Code ◽  
Three Dimensional Modeling ◽  
Machining Center ◽  
Means Of Measurement

Inverse design is the process of using a certain means of measurement to measure entity or model, and according to the measurements, refactoring physical CAD model through Three-dimensional geometric modeling methods. Basing on the little model, use reverse engineering methods, three-dimensional scanning technology and Raindrop Company produced the inverse engineering software to finish the reverse three-dimensional modeling design of little bear punch. Applying Master CAM to set parameters, simulation run, and automatically generate NC code, in the vertical machining center, complex curved surface NC machining of the model can be finished. In engineering practice, it can improve work efficiency, reduce the labor intensity of product development, and reduce the artificial error of the design.

RIGOROUS ENGINEERING PRACTICE AND FORMAL REASONING OF DEEP DOMAIN KNOWLEDGE—THE BASIS OF DEPENDABLE KNOWLEDGE BASED SYSTEMS FOR PROCESS PLANT CONTROL

1993 ◽  
Vol 03 (01) ◽  
pp. 53-98 ◽  
Author(s):  
SANDRO BOLOGNA ◽  
TERJE SIVERTSEN ◽  
HEIKKI VÄLISUO
Keyword(s):  
Artificial Intelligence ◽  
Domain Knowledge ◽  
Engineering Practice ◽  
Knowledge Based Systems ◽  
Control Engineering ◽  
Engineering Software ◽  
Knowledge Based ◽  
Process Plant ◽  
Verification Process ◽  
The Many

Knowledge based systems are often used to replace humans in solving problems for which only heuristic knowledge on the solution is available. However, there are also important application areas where nonheuristic knowledge is available e.g. in technical documents but where efficient use of the knowledge is impossible without the techniques provided by artificial intelligence. High dependability of these kinds of applications can be achieved if domain knowledge can be represented in a language providing both adequate representational constructs and the required level of formality. In addition, the language should be supported by powerful tools assisting in the verification process. Knowledge Based Systems, despite the different technology employed, are still nothing more than a computer program. Unfortunately, quite a few people building knowledge based systems seem to ignore the many good programming practices that have evolved over the years for producing traditional computer programs. What we need is a framework for the modelling of the KBSs development. In our work, it is claimed that these requirements can be met by utilizing and combining ideas from control engineering, software engineering and artificial intelligence.

Numerical Analysis of the Excavation of Deep Pit Based on Mohr-Coulomb Failure Model

2014 ◽  
Vol 919-921 ◽  
pp. 697-700
Author(s):  
Hai Jian Sun ◽  
Yong Quan Li
Keyword(s):  
Numerical Analysis ◽  
Numerical Method ◽  
Horizontal Displacement ◽  
Rate Dependence ◽  
Isotropic Hardening ◽  
Engineering Practice ◽  
Failure Model ◽  
Deep Pit ◽  
Coulomb Failure

The Principles of Mohr-Coulomb failure model and hardening and rate dependence are dealt with in detail. Based on Mohr-Coulomb failure model with isotropic hardening, numerical analysis is conducted . The results calculated show that the horizontal displacement and moment of the continuous wall, and the subsidence of surface outside the pit agree with the objective laws during the excavation. The method adopted and those results gained by numerical method may provide reference to engineering practice.

Numerical Analysis of Deformation of Foundation in the Process of Constructing Soil Dam

2014 ◽  
Vol 962-965 ◽  
pp. 2939-2943
Author(s):  
Hai Jian Sun ◽  
Yong Quan Li
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Numerical Method ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Engineering Practice ◽  
Consolidation Process

Matching Mohr-Coulomb parameters to the Drucker-Prager model is deduced and the method of transferring to equivalent sand wall in drain pile ground is introduced in detail. Numerical simulation is conducted in the process of constructing soil dam. The results show that the maximum vertical displacement happens in the center of the dam and the maximum horizontal displacement happens in the toe of the dam. The numerical method in this paper may be used to predict the consolidation process in drain pile ground in the process of constructing soil dam. Those results gained by numerical method may provide reference to engineering practice.

scholarly journals Study on Optimization Seismic Design of Tall Building Structure

2015 ◽  
Vol 4 (2) ◽  
pp. 17
Author(s):  
Lei Yang
Keyword(s):  
Seismic Design ◽  
Optimization Design ◽  
Engineering Practice ◽  
Building Structure ◽  
Design Code ◽  
Stage Design ◽  
High Rise ◽  
Seismic Design Code ◽  
Earthquake Performance ◽  
Property Losses

<p>The heavy casualties and property losses caused by the earthquake this huge disaster, making high-rise building seismic become the focus of attention. Our new building seismic design code (GB50011-2001) (hereinafter referred to as "Seismic Design Code”) continue to be used (GBJ-89) specification to determine the "three earthquake performance objectives, two-stage design step" seismic design, and made many important supplement and perfect. The new seismic design of buildings in terms of requirements for introducing means as constraints optimization design, optimization design closer to engineering practice.</p>

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