Influence of the choice of the base model on the stress-strain state of the vertical load-bearing elements of a monolithic-frame house

Main Article Content

Viktor Nosenko
Ostap Kashoida

Abstract

Comparison of the stress-strain state of vertical elements of the frame of a monolithic house (basement, first and fourth floors), depending on the method of modeling the soil environment and piles, is carried out.


The use of pile foundations is due to the fact that they provide the transfer of loads to deeper soil layers and, as a rule, a greater bearing capacity compared to shallow foundations. In the design of foundations, engineers face the question of how to model the soil environment and piles?


This paper presents the influence of the decision taken (the selected soil model and the method of modeling piles) on the stress-strain state of the vertical load-bearing elements of the house frame.


Comparison of the stress-strain state of vertical elements of the frame (basement, first and fourth floors), which were obtained using the following models of the system «base - pile foundation - overhead supporting structures»:


1) the piles are modeled by single-node finite elements, have only vertical stiffness according to the results of testing the piles for vertical static pressing loads, the mutual influence of piles and soil characteristics are not taken into account (FE-56 hereinafter, this is the number of the finite element in the library of elements of the PС «Lira -SAPR»)


2) the piles are modeled by single-node finite elements, are located with a given step along the length of the pile and have rigidity in different directions and approximately take into account the surrounding soil around the pile and under its tip (FE-57);


3) the soil environment is modeled by volumetric elastic finite elements; piles - rod finite elements.


It is shown that the choice of the foundation model carries stress-strain state not only for the foundation structures, but also for the vertical bearing elements of the house. When using various options for modeling the base: using a single-node finite element that simulates a smoke like elastic ligature (FE-56), using a chain of single-node skinned elements (FE-57), or a volumetric soil massif, it is possible to obtain quantitative differences in stresses from 2 to 20%, and a qualitative change, which is observed in a change in the sign of bending moments.


 

Article Details

Section
Статті
Author Biographies

Viktor Nosenko, Kyiv National University of Construction and Architecture

Associate Professor of the Department of Geotechnics

Ph.D.

Associate Professor

 

Ostap Kashoida, Kyiv National University of Construction and Architecture

postgraduate of the Department of Geotechnics

 

References

Бойко І.П. Особливості взаємодії пальо-вих фундаментів під висотними будинка-ми з їх основою. / І.П.Бойко // Основи і фундаменти: Міжвідомчий науково-технічний збірник. – К.: КНУБА. – 2006. – Вип. 30. – С. 3-8.

Носенко В.С. Напружено-деформований стан пальово-плитних фундаментів сек-ційних висотних будинків: дис. ... канд. техн. наук: 05.23.02 / Носенко Віктор Сер-гійович. – К.: КНУБА, 2012. – 175с.

Підлуцький В.Л. Взаємодія фундаментної плити з палями різної довжини з грунто-вою багатошаровою основою: дис. ... канд. техн. наук: 05.23.02 / Підлуцький Василь Леонідович. – К.: КНУБА, 2013. – 230с.

Сахаров В.О. Моделювання взаємодії па-льового фундаменту з нелінійною осно-вою в умовах прибудови: дис. ... канд. техн. наук: 05.23.02 / Сахаров Володимир Олександрович. – К.: КНУБА, 2005. – 215 с.

Улицкий В.М. Расчеты и интерактивный мониторинг при строительстве зданий в сложных грунтовых условиях / В.М. Ули-цкий, К.Г. Шашкин, А.Г. Шашкин // Тех-нологии безопасности и инженерные си-стемы № 2(13). – С-Пб: Стройиздат. – 2007. – С. 16-19.

Шашкин К.Г. Взаимодействие здания и основания: Методика расчета и практиче-ское применение при проектировании / К.Г.Шашкин, А.Г.Шашкин. – С-Пб: Стройиздат, 2002. – 48с.

Boyko I.P. Finite element simulation of the loss of stable resistance in a foundation-soil system / I.P. Boyko, V.S. Boyandin, A.E. Delnik, A.L. Kozak, A.S. Sakharov // Archive of Applied Mechanics № 62. – 1992. – р. 316-328.

Городецкий А.С. Компьютерные модели конструкций / А.С. Городецкий, И.Д. Евзеров. – Київ: ФАКТ, 2007. – 392с.

Носенко В.С. Числове моделювання на-пружено-деформованого стану пальового фундаменту з використанням різних мо-делей ґрунтової основи / В.С. Носенко, О.О. Кашоїда // Основи і фундаменти: Науково-технічний збірник. – К.: КНУБА. – 2019. – Вип. 38. – С. 34-43.

Bоyko I.P. (2006). Osoblyvosti vzaiemodii palovykh fundamentiv pid vysotnymy budynkamy z yikh osnovoiu [Features of the interaction of pile foundations under high-rise buildings with their foundation]. Osnovu i fundamenty: Mizhvidomchyj naukovo-tekhnichnyj zbirnyk. Kyiv: KNUBA, 30, 3-8 (in Ukrainian).

Nosenko V.S. (2012). Napruzheno-deformovanyj stan paljovo-plytnykh fundamentiv sekcijnykh vysotnykh budynkiv [Stress-strain state of plate-pile foundations of sectional high-rise buildings]. Dys. kand. tekhn. nauk: 05.23.02. Kyiv: KNUBA, 175 (in Ukrainian).

Pidlutskyi V.L. (2013). Vzayemodiya fundamentnoyi plyty z palyamy riznoyi dovzhyny z gruntovoyu bagatosharovoyu osnovoyu [Interaction of a base plate with piles of different lengths with a soil multilayer basis]. Dys. kand. tekhn. nauk: 05.23.02. Kyiv: KNUBA, 230 (in Ukrainian).

Sakharov V.O. (2005). Modelyuvannya vzayemodiyi paljovogo fundamentu z nelinijnoyu osnovoyu v umovakh prybudovy [Modeling of the interaction of a pile foundation with a nonlinear basis in the conditions of an extension]. Dys. kand. tekhn. nauk: 05.23.02. Kyiv: KNUBA, 215 (in Ukrainian).

Ulitskiy V.M., Shashkin K.G., Shashkin A.G. (2007). Raschjoty i interaktivnyj monitoring pri stroitel`stve zdanij v slozhnykh gruntovykh usloviyakh [Calculations and interactive monitoring during the construction of buildings in difficult ground conditions]. Tekhnologii bezopasnosti i inzhenernye sistemy. S-Petersburg: Strojizdat, 2(13), 16-19 (in Russian).

Shashkin K.G., Shashkin A.G. (2002). Vzaimodejstvie zdaniya i osnovaniya: Metodika rascheta i prakticheskoe primenenie pri proektirovanii [Interaction of the building and the foundation: Method of calculation and practical application in the design]. S-Petersburg: Strojizdat, 48 (in Russian).

Boyko I.P., Boyandin V.S., Delnik A.E., Kozak A.L., Sakharov A.S. (1992). Finite element simulation of the loss of stable resistance in a foundation-soil system. Archive of Applied Mechanics, 62, 316-328.

Gorodetskiy A.S. (2007). Computer models of structures. Kyiv, FAKT, 392 (in Ukrainian)

Nosenko V.S., Kashoida O.O. (2019). Chyslove modelyuvannya napruzheno-deformovanoho stanu palʹovoho funda-mentu z vykorystannyam riznykh modeley gruntovoyi osnovy [Numerical simulation the stress-strain state of the pile foundation building using different soil models]. Osnovu i fundamenty: Naukovo-tekhnichnyj zbirnyk. Kyiv: KNUBA, 38, 34-43 (in Ukrainian).