scholarly journals Computational algorithm for the verification of reinforced concrete sections in fire situation

2019 ◽  
Vol 12 (4) ◽  
pp. 932-955
Author(s):  
E. P. G. PADRE ◽  
J. C. L. RIBEIRO ◽  
R. C. S. S. ALVARENGA ◽  
R. C. SILVA
Keyword(s):  
Reinforced Concrete ◽  
Structural Design ◽  
Room Temperature ◽  
Computational Algorithm ◽  
Technical Standards ◽  
Technical Literature ◽  
Element Mesh ◽  
Integration Algorithm ◽  
Stress Integration ◽  
In Fire

Abstract Reinforced concrete structures may have reduced strength due to the degradation of their mechanical properties by temperature. This can increase the risk of structural collapses. Thus, the structural design should consider its behavior at room temperature and in fire situation (ABNT NBR 14432:2001). This study presents the development of an algorithm to verify the strength of any reinforced concrete sections subjected to unsymmetrical bending at room temperature and in fire situation. For this purpose, a stress integration algorithm was implemented from the strain profile of the section according to ABNT NBR 15200:2012, linked to a finite element mesh generator and a thermal analysis algorithm. For validation of the developed program, called Pisafo, the results obtained were compared with those in the technical literature: obtained in experiments (with differences of up to 28.5%) and with recognized software solutions (with differences of up to -14.8%). The largest variations in relation to the experiments can be attributed to the differences between the thermal properties of the concrete in the experiments with those prescribed in the technical standards used by the program and the non-consideration of spalling in the computational analysis.

scholarly journals On the use of parameter γ z in fire situation

2019 ◽  
Vol 12 (6) ◽  
pp. 1327-1344
Author(s):  
E. A. K. NACCACHE ◽  
I. PIERIN ◽  
V. P. SILVA
Keyword(s):  
Reinforced Concrete ◽  
Room Temperature ◽  
Concrete Structures ◽  
Concrete Frames ◽  
Geometric Imperfections ◽  
Reinforced Concrete Frames ◽  
Load Combination ◽  
The Subject ◽  
In Fire ◽  
Horizontal Action

Abstract Herein will be presented a study on the use of parameter γz for reinforced concrete frames in fire situation. Currently, there are no results of similar research for concrete structures, since the subject has not received the adequate attention. In fire situation, many of the horizontal actions are no longer considered in exceptional load combination, leaving only the horizontal action due to the global geometric imperfections. Once the equivalent horizontal forces to these imperfections are obtained, the parameter is applied. One of the conclusions was that the parameter γz is not adequate, in particularly for high buildings, indicating that more research is necessary. Even so, using γz for room temperature, we conclude that fires that affect lower floors are more damaging to the building and more floors under fire also lead to worse results.

scholarly journals Analysis of the assessment methods of reinforced concrete beams in fire conditions proposed by NBR 15200

2018 ◽  
Vol 11 (6) ◽  
pp. 1308-1325
Author(s):  
F. L. BOLINA ◽  
B. BAQUES ◽  
B. F. TUTIKIAN ◽  
J. P. C. RODRIGUES
Keyword(s):  
Reinforced Concrete ◽  
Room Temperature ◽  
Test Methods ◽  
Reinforced Concrete Beams ◽  
Multiple Test ◽  
Design Time ◽  
Simplified Method ◽  
Tabular Method ◽  
In Fire ◽  
Fire Conditions

Abstract In Brazil, reinforced concrete structures designed based on NBR 6118 [1] must be assessed in fire conditions through NBR 15200 [2], which proposes multiple test methods. Concerning beams, this standard offers the tabular and simplified methods as possible choices. This study aimed to compare these two methods by applying their principles to isostatic and hyperstatic beams with section of 20x50 cm, designed at room temperature according to NBR 6118 [1]. The temperature distribution along sections was obtained by means of a software program. The results from this study indicated that the simplified method yielded higher fire-resistance ratings (FRR) in 75% of cases, although not surpassing the tabular method by 30 minutes. The simplified method allowed an optimization of the results, despite the longer design time.

scholarly journals Structure Analysis and Design of Automobile plastic clutch pump body based on friction welding

2020 ◽  
Vol 316 ◽  
pp. 02001
Author(s):  
Jing Sheng ◽  
Aamir Sohail ◽  
Mengguang Wang ◽  
Zhimin Wang
Keyword(s):  
High Temperature ◽  
Structural Design ◽  
Friction Welding ◽  
Room Temperature ◽  
Welding Process ◽  
Structure Type ◽  
Mechanical Analysis ◽  
Analysis And Design ◽  
Technical Requirements ◽  
Design Requirements

In order to realize the need for lightweight automobiles through replacing steel with plastics, the research and development of the plastic clutch pump body based on the friction welding was carried out. For the clutch pump body connected by friction welding process between the upper pump body and the lower pump body, the technical requirements of pressure 14 MPa and durability (high temperature 7.0 × 104 times, room temperature 7.0 × 105) are required. The structure type of the upper and lower pump bodies of the end face welding type was proposed. Through the static analysis of the pump body and weld and the mechanical analysis under the working condition, the structure of the clutch pump body (upper and lower pump body) was determined. According to the established welding process, the pressure of the clutch pump body is more than 15 MPa, and the number of high-temperature durable circulation and the number of room temperature durable circulation also reached 7.2×104 and 7.3×105 times respectively. The results show that the structural design of a clutch pump body meets the design requirements.

scholarly journals On-Site Structural Design Capacity Checker for Reinforced Concrete Beams

2018 ◽  
Vol 429 ◽  
pp. 012018
Author(s):  
S M Razak ◽  
M A Azizan ◽  
A Adnan ◽  
C H Ing ◽  
K W C Tan ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Structural Design ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Design Capacity

Fire Behaviors of Restrained RC Beams with Slab

2010 ◽  
Vol 163-167 ◽  
pp. 1445-1450
Author(s):  
Gui He Tang ◽  
Bo Wu
Keyword(s):  
Reinforced Concrete ◽  
Computer Program ◽  
Axial Force ◽  
Stiffness Ratio ◽  
Rc Beams ◽  
Slab Width ◽  
Standard Fire ◽  
Rotational Restraint ◽  
Simulation Results ◽  
In Fire

Using the computer program SAFIR, the behaviors of restrained reinforced concrete (RC) beams with slab exposed to ISO834 standard fire are analyzed. The influences of three parameters (i.e., width of slab, axial restraint stiffness ratio, and rotational restraint stiffness ratio) on the beams’ behaviors in fire are investigated. Simulation results show that: (a) the axial force in the slab is much larger than that in the beam on the whole; (b) after 0.5 hour of heating the axial force in the slab decreases gradually with an increasing of the slab width ranging from 1.0 m to 2.5 m, but the influence of the slab width ranging from 1.0 m to 2.5 m on the axial force in the beam is limited; and (c) the effect of the rotational restraint stiffness ratio on the axial force in the beam/slab is very limited, but the beam’s peak hogging moment increases gradually with an increasing of the rotational restraint stiffness ratio.

scholarly journals ELECTRONIC EVIDENCE IN THE ADMINISTRATIVE PROCEDURE IN UKRAINE IN THE LIGHT OF THE INFORMATIONAL APPROACH

2020 ◽  
pp. 80-91
Author(s):  
Vitalii Budkevych
Keyword(s):  
Deductive Reasoning ◽  
Scientific Paper ◽  
Legal Regulation ◽  
Technical Standards ◽  
Technical Literature ◽  
Electronic Evidence ◽  
Administrative Procedure ◽  
Legislative Amendments ◽  
Definition Of ◽  
Theory Of Evidence

The purpose of the scientific paper is to develop solutions for the improvement of the electronic evidence sub-institute in the administrative procedure in Ukraine based on the informational approach. The methodological framework for the research is represented by theoretical advances in the field of procedural law, with an emphasis on the theory of evidence and proof, as well as computer forensics, information law and technical literature. Comparative and formal legal methods, structural-functional analysis, inductive and deductive reasoning have been used to conduct the research. As a result of the research the analysis of the current theoretical developments in the study of the interdisciplinary sub-institute of the electronic evidence has been conducted; scientific comparison between the “objective” (traditional to the domestic theory of proof) and “informational” approaches to the definition of electronic evidence has been carried out; main theoretical and practical issues, arising from the application of different approaches to the perception of electronic evidence have been discovered and propositions for legislative amendments were made. Key findings of the study are briefly summarized below. In determination of the concept and the essence of electronic evidence an optimal combination of both objective and informational approaches to the perception of the electronic evidence should be applied. Differentiation between the original and the copy of electronic evidence should not be abandoned, and it should be allowed for the court to substantiate its findings with the copies of the electronic evidence in specific cases. Particular amendments to the Code of Administrative Procedure of Ukraine should be made with respect to: the definition of the original and the copy of electronic evidence; legal regulation of particular issues concerned with the use of originals and copies of the electronic evidence when proving the factual circumstances of the case (as well as when rendering the final and interim decisions by the court and when using the special knowledge) – primarily, in compliance with technical standards, that have recently been approved in Ukraine, regulating certain issues on the processing of electronic digital evidence.

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