scholarly journals AN INVESTIGATION INTO WORKING BEHAVIOR CHARACTERISTICS OF PARABOLIC CFST ARCHES APPLYING STRUCTURAL STRESSING STATE THEORY

2019 ◽  
Vol 25 (3) ◽  
pp. 215-227 ◽  
Author(s):  
Jun Shi ◽  
Kangkang Yang ◽  
Kaikai Zheng ◽  
Jiyang Shen ◽  
Guangchun Zhou ◽  
...  
Keyword(s):  
Structural Design ◽  
Strain Energy ◽  
Failure Load ◽  
Shape Function ◽  
Qualitative Change ◽  
State Theory ◽  
State Change ◽  
Strain Data ◽  
Definition Of ◽  
Behavior Characteristics

This paper conducts the experimental and simulative analysis of stressing state characteristics for parabolic concretefilled steel tubular (CFST) arches undergoing vertical loads. The measured stain data is firstly modeled as the generalized strain energy density (GSED) to describe structural stressing state mode. Then, the normalized GSED sum Ej,norm at each load Fj derives the Ej,norm-Fj curve reflecting the stressing state characteristics of CFST arches. Furthermore, the Mann-Kendall criterion is adopted to detect the stressing state change of the CFST arch during its load-bearing process, leading to the revelation of a vital stressing state leap characteristic according to the natural law from quantitative change to qualitative change of a system. The revealed qualitative leap characteristic updates the existing definition of the CFST arch’s failure load. Finally, the accurate formula is derived to predict the failure/ultimate loads of CFST arches. Besides, a method of numerical shape function is proposed to expand the limited strain data for further analysis of the stressing state submodes. The GSED-based analysis of structural stressing state opens a new way to recognize the unseen working behavior characteristics of arch structures and the updated failure load could contribute to the improvement on the structural design codes.

scholarly journals Stressing State Analysis of an Integral Abutment Curved Box-Girder Bridge Model

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1841
Author(s):  
Jun Shi ◽  
Jiyang Shen ◽  
Xiaohui Yu ◽  
Junran Liu ◽  
Guangchun Zhou ◽  
...  
Keyword(s):  
Failure Load ◽  
State Theory ◽  
Structural Failure ◽  
Integral Abutment ◽  
Box Girder ◽  
Future Design ◽  
Bridge Model ◽  
Variation Characteristics ◽  
Definition Of ◽  
Behavior Characteristics

This paper experimentally investigates the working behavior characteristics of an integral abutment curved box-girder (IACBG) bridge model based on the structural stressing state theory. First, the stressing state of the bridge model is represented by generalized strain energy density (GSED) values at each load Fj and characterized by the normalized GSED sum Ej,norm. Then, the Mann-Kendall (M-K) criterion is adopted to detect the stressing state mutations of the bridge model from Ej,norm-Fj curve in order to achieve the new definition of structural failure load. Correspondingly, the stressing state modes for the bridge model’s sections and internal forces are reached in order to investigate their variation characteristics and the coordinated working behavior around the updated failure load. The unseen knowledge is revealed by studying working behavior characteristics of the bridge model. Therefore, the analytical results could provide a new structural analysis method, which updates the definition of the existing structural failure load and provides a reference for future design of the bridges.

scholarly journals Stressing State Analysis of CFST Arch Supports in Deep Roadway Based on NSF Method

2019 ◽  
Vol 9 (20) ◽  
pp. 4238 ◽  
Author(s):  
Shen ◽  
Huang ◽  
Yang ◽  
Shi ◽  
Zheng
Keyword(s):  
Steel Tube ◽  
State Theory ◽  
Underground Structures ◽  
Damage Development ◽  
Future Design ◽  
Measured Strain ◽  
Definition Of ◽  
Behavior Characteristics ◽  
Different Characteristics ◽  
Arch Supports

This paper experimentally analyzes the working behavior characteristics of five concrete-filled steel tube (CFST) arch supports in deep roadway based on the numerical shape function (NSF) method and structural stressing state theory. First, the measured strain data are expanded by the NSF method and modeled as generalized strain energy density (GSED) to characterize the stressing state of the supports. Then, one of the supports is taken as an example and the Mann-Kendall (M-K) criterion is adopted to detect the mutation characteristics of the support, which derives the new definition of structural failure load. Correspondingly, the stressing state modes as well as strain and stress fields for the support are proposed to verify their mutation characteristics. Finally, the common and different characteristics of stressing state, damage development and internal forces for different supports are also summarized. The analytical results of the supports explore a new analysis method for underground structures and the unseen knowledge provides a reference to more rational future design.

scholarly journals Stressing State Analysis on a Single Tube CFST Arch Under Spatial Loads

2019 ◽  
Vol 9 (23) ◽  
pp. 5039
Author(s):  
Kangkang Yang ◽  
Jian Yuan ◽  
Jun Shi ◽  
Kaikai Zheng ◽  
Jiyang Shen
Keyword(s):  
Strain Energy Density ◽  
Strain Energy ◽  
Characteristic Curve ◽  
Arch Model ◽  
Average Strain ◽  
Bending Strain ◽  
Strain Data ◽  
Internal Forces ◽  
Arch Structures ◽  
Behavior Characteristics

This paper analyzes the stressing state characteristics of a concrete-filled steel tubular (CFST) arch model under spatial loads, using the method of modeling structural stressing state and the thin plate simulating interpolation (TSI) method. Firstly, the parameter-generalized strain energy density (GSED) is applied to model the stressing state of the arch. Then, the normalized GSED sum at each load plots the characteristic curve. The characteristic loads P (66 kN) and Q (85 kN) in the curve are distinguished by the Mann–Kendall (M–K) criterion. To characterize structural axial and bending stressing states, the parameters of the sectional average strain and generalized bending strain are proposed as stressing state submodes. Finally, the TSI method is used to interpolate strain data for deep analysis of internal forces. By modeling the structural stressing state, the working behavior characteristics of arch structures are greatly revealed in a particular view and the results could provide a reference for the development of bridge design.

scholarly journals Essential Stressing State Features of Laterally Loaded Masonry Wall Panels Revealed from Experimental Displacements

2021 ◽  
Author(s):  
Bai Liu ◽  
Rui Li ◽  
Yu Zhang ◽  
Guangchun Zhou
Keyword(s):  
Failure Load ◽  
Failure Process ◽  
Qualitative Change ◽  
Characteristic Parameter ◽  
Masonry Wall ◽  
State Theory ◽  
Structural Failure ◽  
Starting Point ◽  
Wall Panels ◽  
Laterally Loaded

Abstract This study reveals the essential and general working features of laterally loaded masonry (LLM) wall panels from their experimental displacements by applying structural stressing state theory. Firstly, the generalized work of force is proposed to express the stressing state mode and its characteristic parameter. Then, the Mann-Kendall criterion is applied to detect the mutation point in the curve of the characteristic parameter with the load increase. Correspondingly, it is verified that the evolution of the stressing state mode also embodies the mutation feature. The stressing state mutation feature is inherent and common as the embodiment of the natural law from quantitative change to qualitative change of a system. The stressing state mutation feature reveals the starting point of structural failure process, which could update the existing definition of structural failure load. Further, the elastoplastic branch (EPB) point is revealed referring to the updated failure load, which might be directly taken as the design load with the rational margin of safety. In a sense, this paper presents a new way to address the classic issue of structural load-bearing capacity uncertainty and to update the existing design codes of LLM wall panels.

scholarly journals STRESSING STATE ANALYSIS OF LARGE CURVATURE CONTINUOUS PRESTRESSED CONCRETE BOX-GIRDER BRIDGE MODEL

2019 ◽  
Vol 25 (5) ◽  
pp. 411-421 ◽  
Author(s):  
Jun Shi ◽  
Jiyang Shen ◽  
Guangchun Zhou ◽  
Fengjiang Qin ◽  
Pengcheng Li
Keyword(s):  
Structural Analysis ◽  
Prestressed Concrete ◽  
Qualitative Change ◽  
State Theory ◽  
Box Girder ◽  
Large Curvature ◽  
Bridge Model ◽  
Concrete Box Girder ◽  
Angle Of View ◽  
Behavior Characteristics

This paper experimentally analyzes the working behavior characteristics of a large-curvature continuous prestressed concrete box-girder (CPCBG) bridge model based on structural stressing state theory. First, the measured strain data is modeled as generalized strain energy density (GSED) to characterize the stressing state of the bridge model. Then, the Mann-Kendall (M-K) criterion is adopted to detect the stressing state leaps of the bridge model according to the natural law from quantitative change to qualitative change of a system, which derives the new definition of structural failure load. Correspondingly, the stressing state modes for the bridge model’s sections and internal forces are proposed to verify their changing characteristics and the coordinate working behavior around the characteristic loads. The analytical results reveal the working behavior characteristics of the bridge mode unseen in traditional structural analysis, which provides a new angle of view to conduct structural analysis and a reference to the improvement of design codes.

scholarly journals Study on Stressing State and Failure Criterion of Concrete-Filled Stainless Steel and Steel Tubular Column

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Baisong Yang ◽  
Wei Wang ◽  
Lingxian Yang ◽  
Guorui Sun ◽  
Sijin Liu
Keyword(s):  
Stainless Steel ◽  
Strain Energy ◽  
Mechanical Characteristics ◽  
Failure Load ◽  
Qualitative Change ◽  
Parameter Analysis ◽  
Finite Element Models ◽  
Simulation Data ◽  
Contour Maps ◽  
Stress Contour

In this paper, the mechanical characteristics of concrete-filled stainless steel and steel tubular (CFSSAST) columns under axial and eccentric loads are analyzed by using the theory of structural stressing state. Firstly, the sum of generalized strain energy density (GSED) values of the short column at every load value (Fj) is normalized as Ej,norm to describe the structural stressing state. Then, according to Mann–Kendall (M-K) criterion and the natural law from quantitative change to qualitative change, the transition of stressing state is distinguished, which leads to the update of failure load. Then, the corresponding finite element models are established, and the accuracy of the models is verified by the experimental data, and the stress contour maps are analyzed by simulation data. Finally, the simulation data are used to perform parameter analysis. This study explores a new method to reveal the invisible working characteristics of structures and provides a new reference for the study of similar structures.

scholarly journals On Galileo’s Tallest Column

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Mariano Vázquez Espí ◽  
Jaime Cervera Bravo ◽  
Carlos Olmedo Rojas
Keyword(s):  
Cross Section ◽  
Structural Design ◽  
Design Theory ◽  
Shape Function ◽  
Affirmative Answer ◽  
Infinite Height ◽  
The Subject ◽  
Definition Of ◽  
First Time ◽  
Constant Maximum

The height at which an unloaded column will fail under its own weight was calculated for first time by Galileo for cylindrical columns. Galileo questioned himself if there exists a shape function for the cross section of the column with which it can attain a greater height than the cylindrical column. The problem is not solved since then, although the definition of the so named “constant maximum strength” solids seems to give an affirmative answer to Galileo’s question, in the form of shapes which seem to attain infinite height, even when loaded with a useful load at the top. The main contribution of this work is to show that Galileo’s problem is (i) an important problem for structural design theory of buildings and other structures, (ii) not solved by the time being in any sense, and (iii) an interesting problem for mathematicians involved in related but very different problems (as Euler’s tallest column). A contemporary formulation of the problem is included as a result of a research on the subject.

A case for multiple views of function in design based on a common definition

2013 ◽  
Vol 27 (3) ◽  
pp. 271-279 ◽  
Author(s):  
Amaresh Chakrabarti ◽  
V. Srinivasan ◽  
B.S.C. Ranjan ◽  
Udo Lindemann
Keyword(s):  
State Change ◽  
Multiple Views ◽  
System Environment ◽  
Common Definition ◽  
Effect Model ◽  
Before And After ◽  
Definition Of

AbstractFunctions are important in designing. However, several issues hinder progress with the understanding and usage of functions: lack of a clear and overarching definition of function, lack of overall justifications for the inevitability of the multiple views of function, and scarcity of systematic attempts to relate these views with one another. To help resolve these, the objectives of this research are to propose a common definition of function that underlies the multiple views in literature and to identify and validate the views of function that are logically justified to be present in designing. Function is defined as a change intended by designers between two scenarios: before and after the introduction of the design. A framework is proposed that comprises the above definition of function and an empirically validated model of designing, extended generate, evaluate, modify, and select of state-change, and an action, part, phenomenon, input, organ, and effect model of causality (Known as GEMS of SAPPhIRE), comprising the views of activity, outcome, requirement–solution–information, and system–environment. The framework is used to identify the logically possible views of function in the context of designing and is validated by comparing these with the views of function in the literature. Describing the different views of function using the proposed framework should enable comparisons and determine relationships among the various views, leading to better understanding and usage of functions in designing.

scholarly journals Learning based on the project entitled "Design and construction of a wooden bridge"

2016 ◽  
Vol 6 (2) ◽  
pp. 135
Author(s):  
Cristina Barris ◽  
Lluís Torres ◽  
Enric Simon
Keyword(s):  
Structural Design ◽  
Failure Load ◽  
Theoretical Calculations ◽  
Project Based Learning ◽  
Course Content ◽  
The Third ◽  
Material Optimization ◽  
Engineering Degree ◽  
The University ◽  
Design And Construction

This article presents the results of a case involving the application of project-based learning carried out with students in the Mechanical Engineering degree program at the University of Girona. The project, entitled “Design and construction of a wooden bridge”, was conducted at the Polytechnic School in the third-year Structures course. This project required students to address, consider and solve different problems related to the resistance of materials, structural calculations, material optimization and structural design. The project also included the building of the bridge based on the calculations made, thus enabling the students to verify the suitability of the theoretical calculations as compared to real results. Finally, a competition was held to reward those teams who obtained the best ratio between the failure load and the weight of the bridge. The main conclusion observed from the implementation of only two editions of this project is the acquisition of the different proposed competences (both specific and cross-curricular) by the students. Finally, it was interesting to note that after completing the activity, the students were observed to be more motivated by the course content.

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