Demountable concrete buildings, structural design of floor slabs with concrete elements and aluminium foam

2007 ◽  
pp. 697-709
Author(s):  
Georg Christian Weiss
Keyword(s):  
Structural Design ◽  
Aluminium Foam ◽  
Concrete Buildings ◽  
Floor Slabs ◽  
Concrete Elements

Effects of Fibres on Improvement the Cracking in Concrete Slabs

2014 ◽  
Vol 1025-1026 ◽  
pp. 997-1004
Author(s):  
Arton Dautaj ◽  
Naser Kabashi ◽  
Cene Krasniqi ◽  
Patriot Ahmeti
Keyword(s):  
Structural Design ◽  
Composite Structures ◽  
Concrete Slab ◽  
Concrete Slabs ◽  
Design Requirement ◽  
Polypropylene Fibres ◽  
Hardening Process ◽  
Traditional Definition ◽  
Definition Of ◽  
Concrete Elements

The behaviour of concrete elements under loads, hydrated process and several conditions is one of the actually problems on improvement of structures or elements of structures. In this paper we analyze the problem of cracking, such a result of loading and hardening process of concrete. One of the way for improvement is using the polypropylene fibres , and creating the composite materials In this case of studies we used experimental examinations of concrete slab, such a model, for - slab (referent model) - slab with different percent of fibres The most of comparing results are on comparing the effect of fibres in improvement of energy capacity of concrete elements, and following the crack situation, or decreasing the dimensions of cracks. One of the most important value based on the behavior of the structure is ductility. The ductility is a structural design requirement in most design codes. The traditional definition of ductility cannot be applied to composite structures, but will be analyzed on the increasing the dissipations of energy. Several methods are used on the analyzing of this problem and propose to calculate the absorption the energy in concrete slab and to analyze the positions of cracks.

scholarly journals Effects of floor slabs on the flexural strength of beams in reinforced concrete buildings

2017 ◽  
Vol 50 (4) ◽  
pp. 517-526
Author(s):  
Toshimi Kabeyasawa ◽  
Toshikazu Kabeyasawa ◽  
Hiroshi Fukuyama
Keyword(s):  
Reinforced Concrete ◽  
Flexural Strength ◽  
Seismic Action ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Slab Width ◽  
Floor Slabs ◽  
Current Design ◽  
Loading Methods ◽  
Set Up

The effects of floor slabs on the flexural strength of beams in reinforced concrete buildings under seismic action were verified through tests of frame assembly specimens. A series of experimental and analytical investigations were conducted from 2010 to 2014 in order to further validate the current design practices in Japan. Loading methods in the past beam component tests were reviewed with probable effects of floor slabs. A special loading set-up was used for the frame assembly specimens consisting of four columns and four beams with lengths of one span and two half spans in two directions. The four columns were loaded laterally and independently at mid-height of the upper storey and supported at mid-height of the lower storey with pin-fixed and pin-roller so that axial elongation of the beams and slab would not be constrained by the lateral forces. It has been found from these new loading tests that the tensile stresses in the floor slab reinforcing bars are generally uniform at the beam critical sections and up to the full slab width for the flexural strength when the slab is subjected to tension bending around one percent storey drift, which is much wider than assumed in the current design evaluation.

Stochastic Optimization of a Reinforced Concrete Elements Using Heuristic Algorithm

2018 ◽  
Vol 272 ◽  
pp. 262-269
Author(s):  
Jakub Venclovský ◽  
Petr Štěpánek ◽  
Ivana Laníková
Keyword(s):  
Reinforced Concrete ◽  
Stochastic Optimization ◽  
Structural Design ◽  
Mathematical Optimization ◽  
Steel Reinforced Concrete ◽  
Reduced Gradient Method ◽  
Deterministic Problem ◽  
Reduced Gradient ◽  
Probabilistic Nature ◽  
Concrete Elements

It is possible to see various applications of mathematical optimization in civil engineering (structural design, reconstruction of transportation networks etc.) Initially, deterministic approaches have been introduced to solve these problems. But despite their complexity, these approaches are insufficient to comprehend the probabilistic nature of said problems and thus provide only suboptimal solutions. Hence the effort comes to reconsider these deterministic approaches and deal with uncertainties involved in said problems in less straightforward way. The goal of the paper is to present the algorithm for stochastic optimization of design of steel-reinforced concrete cross-section. This algorithm is based on internal cycle of deterministic optimization using reduced gradient method and external cycle of stochastic optimization using regression analysis. Firstly, the deterministic problem is introduced and described. It is followed by the description of uncertainties, which are involved in the process, and stochastic reformulation of the problem. Then the algorithm itself is introduced and the paper ends with presentation of the results of performed calculations.

scholarly journals Reliability of Concrete Elements Designed for Alternative Load Combinations Provided in Eurocodes

10.14311/382 ◽  
2003 ◽  
Vol 43 (1) ◽  
Author(s):  
M. Holický ◽  
J. Marková
Keyword(s):  
Structural Design ◽  
Structural Reliability ◽  
Reliability Theory ◽  
Probabilistic Methods ◽  
European Standard ◽  
Limit States ◽  
Design Procedures ◽  
Characteristic Features ◽  
Concrete Elements ◽  
Ultimate Limit

The basic European standard for design of buildings and other engineering works, EN 1990 "Basis of structural design", provides alternative design procedures, for which national choice is allowed. One of the most important questions concerns three fundamental combinations of actions for persistent and transient design situations in the Ultimate limit states. Simple examples of reinforced concrete elements show, that the alternative load combinations may lead to considerably different reliability levels. Probabilistic methods of structural reliability theory are used to identify characteristic features of each combination and to formulate recommendations. However, further calibration studies are urgently needed in order to prepare National annexes to EN 1990 on time.

scholarly journals Analisis Hubungan Balok Kolom Beton Bertulang Proyek Pembangunan Gedung DPRD-Balai Kota DKI Jakarta

2012 ◽  
Vol 3 (1) ◽  
pp. 711
Author(s):  
Agus Setiawan
Keyword(s):  
Reinforced Concrete ◽  
Structural Design ◽  
Critical Area ◽  
Reinforced Concrete Buildings ◽  
Good Ductility ◽  
Concrete Buildings ◽  
City Hall ◽  
Earthquake Resistant ◽  
Column Joint ◽  
Inelastic Region

In terms of structural design of reinforced concrete buildings for earthquake-resistant, the beamcolumn joint is a critical area that needs to be accurately designed properly so that the area is able to dissipate energy in the event of an earthquake. The ability of beam-column joint to deform in the inelastic region provides a structure that has a good ductility, so as to minimize the damage caused by earthquake shaking. This study aims to analyze the design of beam-column connection at the Parliament Building-City Hall of Jakarta. The analysis performed refers to the ”Tata Cara Perhitungan Struktur Beton Untuk Bangunan Gedung”, SNI 03-2847-2002. The analysis results shows that the terms of detailing in the field implementation have not been fulfilled properly.

Structural design constructability verification using BIM

2019 ◽  
Author(s):  
Dirk Kotze ◽  
Jan A. Wium
Keyword(s):  
Structural Design ◽  
Building Structures ◽  
Building Information Modelling ◽  
Analysis Process ◽  
Floor Slabs ◽  
Form Part ◽  
Building Information ◽  
Verification Process ◽  
Coordination And Collaboration

<p>Poor coordination and collaboration between designers and contractors are common within the Architecture, Engineering and Consulting (AEC) industry. The lack of collaboration in projects of building structures often results in unpractical designs which could incur unnecessary costs and time on projects. This study considered the design and construction of suspended floor slabs as a topic to investigate how Building Information Modelling (BIM) can be used as a tool to implement a constructability verification process in structural design.</p><p>Several factors affect constructability of floor slabs. These factors, identified from a previous case study and from literature, were used to derive questions for interviews with contractors. The information gathered during the interviews was used to identify a range of possible verifications which can form part of a proposed constructability analysis process.</p><p>A second round of interviews was conducted with experienced consultants to validate a proposed process and to obtain their preferences in terms of the implementation of the process. The input from the consultants were used to develop guidelines for the implementation of a proposed constructability analysis process.</p>

scholarly journals Relação entre os coeficientes α e γz para edifícios altos de concreto armado e alvenaria estrutural

2020 ◽  
Vol 1 (51) ◽  
pp. 158
Author(s):  
João Paulo Reis Menezes ◽  
Camila De Sousa Vieira ◽  
David Leonardo Nascimento de Figueiredo Amorim
Keyword(s):  
Reinforced Concrete ◽  
Structural Design ◽  
Second Order ◽  
Analytical Relation ◽  
Order Effects ◽  
Masonry Buildings ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Design Values ◽  
Second Order Effects

<p class="Normal1">The inherent relation between the instability parameters α and γz is studied in this paper. Such parameters are simplified criteria widely used in structural design in Brazil to evaluate the necessity to consider the global second order effects. Thus, an analytical relation between the parameters α and γz is proposed through a simple example. For this, design values of α and γz of thirty reinforced concrete buildings and twenty-two masonry buildings were used. The obtained results prove the accuracy of the proposed formulation for both types of construction</p>

scholarly journals Second-order torsion effects in concrete buildings

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Rodrigo Bezerra Andrade ◽  
Petrus Gorgônio Bulhões da Nóbrega
Keyword(s):  
Structural Design ◽  
Design Methodology ◽  
Global Analysis ◽  
Second Order ◽  
Order Effects ◽  
Concrete Buildings ◽  
Internal Forces ◽  
Second Order Effects

ABSTRACT: The internal forces due to torsion in global analysis of buildings, and its second-order effects, usually are not properly considered in structural design or even in design code’s prescriptions. Although the γZ coefficient, which is used to the evaluation of global second-order effects, has a wide, useful and consolidated application, it is true that specific torsional aspects are not well considered by it. This paper discusses the little-known γθ coefficient, an analogous proposition to the γZ coefficient, but focused specifically on the consideration of torsional effects. After the discussion on the concepts and the design methodology, several buildings are evaluated and their displacements and the coefficients γZ and γθ are calculated. Comparing these parameters, and also the results obtained by the P–Δ method, it is demonstrated the importance and the reliability of the γθ coefficient.

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