Investigation and Development of the Design Process for a Pile Group with and without Lateral Resistance from the Soil
(2020) VBKM01 20201Division of Structural Engineering
Department of Building and Environmental Technology
- Abstract
- For bridges in weak ground conditions, piling is an appropriate type of foundation. To manually arrange the piles in a pile group is an iterative, time consuming process where the section forces in the piles must be verified for a large number of load cases. In addition, after installation, piles may have new positions and the capacity must be re-verified.
In this thesis, a software was developed to automatize the design process for pile groups, with the aim to increase the efficiency. The pile groups were optimized ac- cording to maximum and minimum normal forces in the piles, by simulating random pile groups using the Monte Carlo method. The randomly simulated pile parameters included the position, inclination and direction of the pile.... (More) - For bridges in weak ground conditions, piling is an appropriate type of foundation. To manually arrange the piles in a pile group is an iterative, time consuming process where the section forces in the piles must be verified for a large number of load cases. In addition, after installation, piles may have new positions and the capacity must be re-verified.
In this thesis, a software was developed to automatize the design process for pile groups, with the aim to increase the efficiency. The pile groups were optimized ac- cording to maximum and minimum normal forces in the piles, by simulating random pile groups using the Monte Carlo method. The randomly simulated pile parameters included the position, inclination and direction of the pile. Interviews with contractors were also carried out to obtain practical requirements, that were implemented in the program. To evaluate the program, four real cases have been studied that resulted in reasonable preliminary pile groups in an hour or less. In some cases, the number of piles could be reduced. The process still requires some manual surveillance, such as calibrating the input data and evaluating the feasibility of the generated pile groups. This is not necessarily negative, as the output always should be verified.
A separate investigation of the concept of the distance between pile center and load center was also done, to see if the concept can be used in optimization of pile groups. Correlation tests between this distance and resulting minimum normal forces were performed, where the method partly was unverified and therefore, little can be stated about the relevance of this concept. Thus, it seems more reasonable to evaluate pile groups directly by their section forces. (Less) - Abstract (Swedish)
- Pålning är en typ av grundläggning lämplig för att grundlägga broar vid svaga markförhållanden. Att manuellt utforma en pålgrupp är en iterativ, tidskrävande process där snittkrafterna i pålarna måste verifieras för ett stort antal lastfall. Efter installationen kan pålarna dessutom ha nya positioner och kapaciteten måste verifieras igen.
I detta projekt utvecklades en mjukvara för att automatisera dimensioneringsprocessen för pålgrupper, i syfte att öka effektiviteten. Utformningen av pålgruppen optimerades med avseende på största och minsta normalkraft i pålarna, genom att simulera slumpmässiga pålgrupper med Monte Carlo-metoden. De simulerade slumpvariablerna var pålens position, lutning och riktning. Intervjuer med entreprenörer... (More) - Pålning är en typ av grundläggning lämplig för att grundlägga broar vid svaga markförhållanden. Att manuellt utforma en pålgrupp är en iterativ, tidskrävande process där snittkrafterna i pålarna måste verifieras för ett stort antal lastfall. Efter installationen kan pålarna dessutom ha nya positioner och kapaciteten måste verifieras igen.
I detta projekt utvecklades en mjukvara för att automatisera dimensioneringsprocessen för pålgrupper, i syfte att öka effektiviteten. Utformningen av pålgruppen optimerades med avseende på största och minsta normalkraft i pålarna, genom att simulera slumpmässiga pålgrupper med Monte Carlo-metoden. De simulerade slumpvariablerna var pålens position, lutning och riktning. Intervjuer med entreprenörer genomfördes också för att inhämta praktiska önskemål, som implementerades i programmet. För att utvärdera programmet har fyra verkliga fall studerats som resulterade i rimliga preliminära pålgrupper på en timme eller mindre. I vissa fall kunde antalet pålar minskas. Processen kräver fortfarande viss manuell övervakning, till exempel för att kalibrera indata och utvärdera genomförbarheten för de genererade pålgrupperna. Detta är nödvändigtvis inte negativt, då utdatan alltid bör verifieras.
En separat undersökning utfördes av konceptet för avståndet mellan pålcentrum och lastcentrum, för att se om konceptet kan användas vid optimering av pålgrupper. Korrelationstester utfördes mellan detta avstånd och resulterande minsta normalkrafter, där delar av metoden ej var verifierad och därför är relevansen av detta koncept begränsad. Det verkar således rimligare att utvärdera pålgrupper direkt utifrån deras snittkrafter. (Less) - Popular Abstract (Swedish)
- År 2018 installerades cirka 270 mil pålar i Sverige. Om du lägger dessa pålar på linje efter varandra så kan du ringa in hela Sveriges kust. Genom att automatisera utformningen av en pålgrupp kan resurser i form av material, tid och pengar sparas. I detta projekt utvecklades ett program som kan hitta den bästa pålgruppen.
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9029551
- author
- Johansson, Linda and Liljefors, Frida LU
- supervisor
- organization
- course
- VBKM01 20201
- year
- 2020
- type
- H3 - Professional qualifications (4 Years - )
- subject
- keywords
- pile group optimisation, objective function, frame analysis method, lateral resistance of the soil, pålgrupp, optimering, målfunktion, ramanalys, sidomotstånd från jord
- report number
- TVBK-5281
- ISSN
- 0349-4969
- language
- English
- id
- 9029551
- date added to LUP
- 2020-09-28 14:49:20
- date last changed
- 2020-09-28 14:49:20
@misc{9029551,
abstract = {{For bridges in weak ground conditions, piling is an appropriate type of foundation. To manually arrange the piles in a pile group is an iterative, time consuming process where the section forces in the piles must be verified for a large number of load cases. In addition, after installation, piles may have new positions and the capacity must be re-verified.
In this thesis, a software was developed to automatize the design process for pile groups, with the aim to increase the efficiency. The pile groups were optimized ac- cording to maximum and minimum normal forces in the piles, by simulating random pile groups using the Monte Carlo method. The randomly simulated pile parameters included the position, inclination and direction of the pile. Interviews with contractors were also carried out to obtain practical requirements, that were implemented in the program. To evaluate the program, four real cases have been studied that resulted in reasonable preliminary pile groups in an hour or less. In some cases, the number of piles could be reduced. The process still requires some manual surveillance, such as calibrating the input data and evaluating the feasibility of the generated pile groups. This is not necessarily negative, as the output always should be verified.
A separate investigation of the concept of the distance between pile center and load center was also done, to see if the concept can be used in optimization of pile groups. Correlation tests between this distance and resulting minimum normal forces were performed, where the method partly was unverified and therefore, little can be stated about the relevance of this concept. Thus, it seems more reasonable to evaluate pile groups directly by their section forces.}},
author = {{Johansson, Linda and Liljefors, Frida}},
issn = {{0349-4969}},
language = {{eng}},
note = {{Student Paper}},
title = {{Investigation and Development of the Design Process for a Pile Group with and without Lateral Resistance from the Soil}},
year = {{2020}},
}