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 Internal Forces Analysis of Prestressed Concrete Box Girder Bridge by Using Structural Stressing State Theory

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4671
Author(s):  
Shuo Liu ◽  
Yi Zhang ◽  
Jun Shi ◽  
Baisong Yang
Keyword(s):  
Prestressed Concrete ◽  
Failure Load ◽  
Progressive Failure ◽  
State Theory ◽  
Box Girder ◽  
Bridge Model ◽  
Variation Characteristics ◽  
Damage Process ◽  
Box Girder Bridge ◽  
Girder Bridge

This paper analyzes the working behavior characteristics of a prestressed concrete transverse large cantilever continuous (PCTLCC) box girder bridge model based on structural stressing state theory and the numerical shape function (NSF) method. At first, the normalized generalized strain energy density (GSED) is established to model the stressing state of the bridge model. Subsequently, the Mann Kendall (M–K) criterion is applied to detect three characteristic loads, respectively, elastic–plastic branch load P (200 kN), failure load Q (300 kN), and progressive failure load H (340 kN), and the failure load Q is found to be the starting load of the damage process of the bridge model, rather than the ultimate load where the structure has been destroyed. Finally, the NSF method is adopted to interpolate the test data, and a detailed analysis for the variation characteristics of the working behavior of the bridge model under loads is performed based on the interpolation results. The characteristic load detection method and experimental data extension method for PCTLCC box girder bridge established in this study can provide valuable references for the design and analysis of such 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 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 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 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 Working State of ECC Link Slabs Used in Continuous Bridge Decks

2019 ◽  
Vol 9 (21) ◽  
pp. 4667 ◽  
Author(s):  
Junfei Zhong ◽  
Jiyang Shen ◽  
Wei Wang ◽  
Jun Shi ◽  
Xiaocong Yang ◽  
...  
Keyword(s):  
Interpolation Method ◽  
State Theory ◽  
Structural Failure ◽  
Analysis Theory ◽  
Internal Forces ◽  
Failure Point ◽  
Behavior Characteristics ◽  
Yielding Point ◽  
Original Information ◽  
Loading Procedure

The working states of three types of engineered cementitious composites (ECC) link slabs subjected to vertical loads are investigated based on the structural working state theory. The scattered measured strains are firstly expanded into spatially continuous data using the response simulating interpolation method without loss of original information. The generalized strain energy density (GSED) is derived from these data and the sum of which are used to characterize the working states of ECC link slabs. Thereafter, the Mann-Kendall (M-K) criterion is introduced to detect the working state leaps during the whole loading procedure and two critical mutations are revealed: The yielding point and the initial structural failure point. Finally, the working state modes, the characteristics of strain fields and the development of internal forces are employed to verify the working state mutations around the revealed critical points. The GSED-based analysis of structural working state is an innovative method to discern some unseen working behavior characteristics which are ignored by traditional structural analysis theory. The work reported herein has a further effect in improving the structural design codes for ECC link slabs.

scholarly journals Computation of Deflections for PC Box Girder Bridges with Corrugated Steel Webs considering the Effects of Shear Lag and Shear Deformation

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Wei Ji ◽  
Kui Luo ◽  
Jingwei Zhang
Keyword(s):  
Shear Deformation ◽  
Prestressed Concrete ◽  
Displacement Function ◽  
Shear Lag ◽  
Longitudinal Displacement ◽  
Box Girders ◽  
Element Analysis ◽  
Box Girder ◽  
Bridge Model ◽  
Bridge Models

Prestressed concrete (PC) girders with corrugated steel webs (CSWs) have received considerable attention in the past two decades due to their light self-weight and high prestressing efficiency. Most previous studies were focused on the static behavior of CSWs and simple beams with CSWs. The calculation of deflection is an important part in the static analysis of structures. However, very few studies have been conducted to investigate the deflection of full PC girders or bridges with CSWs and no simple formulas are available for estimating their deflection under static loads. In addition, experimental work on full-scale bridges or scale bridge models with CSWs is very limited. In this paper, a formula for calculating the deflection of PC box girders with CSWs is derived. The longitudinal displacement function of PC box girders with CSWs, which can consider the shear lag effect and shear deformation of CSWs, is first derived. Based on the longitudinal displacement function, the formula for predicting the deflection of PC box girders with CSWs is derived using the variational principle method. The accuracy of the derived formula is verified against experimental results from a scaled bridge model and the finite element analysis results. Parametric studies are also performed, and the influences of shear lag and shear deformation on the deflection of the box girder with CSWs are investigated by considering different width-to-span ratios and different girder heights. The present study provides an effective and efficient tool for determining the deflection of PC box girders with CSWs.

Study of a curved continuous composite box girder bridge

1993 ◽  
Vol 20 (1) ◽  
pp. 107-119 ◽  
Author(s):  
S. F. Ng ◽  
M. S. Cheung ◽  
H. M. Hachem
Keyword(s):  
Finite Element ◽  
Structural Response ◽  
Shell Element ◽  
Elastic Response ◽  
Box Girder ◽  
Girder Bridges ◽  
Bridge Model ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Critical Sections

To better understand the behaviour of curved box girder bridges in resisting eccentric design truck loads, and the influence of plan curvature on the structural response, a model study was conducted at the University of Ottawa. In this study, the elastic response of a curved composite box girder bridge model was evaluated experimentally and confirmed analytically using the finite element method. Analytical predictions of both vertical displacements and normal stresses at critical sections compared fairly well with those evaluated experimentally. The isoparametric thin shell element employed in the analysis proved to be versatile and provided an accurate representation of the various structural components of a curved box girder bridge. Despite the eccentric nature of the applied OHBDC design truck loads and the bridge plan curvature, it was evident that in resisting the applied live loads, the girders at critical sections share equal proportions of the applied bending moments. Key words: bridge, curved, cellular, composite, eccentric loads, static, linear, experimental, finite element.

Histories of Design Pedagogy Virtual Special Issue for the Journal of Design History 2016

2016 ◽  
Vol 33 (1) ◽  
pp. e1-e24 ◽  
Author(s):  
Maya Oppenheimer
Keyword(s):  
Design Education ◽  
Design History ◽  
Design Practice ◽  
Design Pedagogy ◽  
Future Design ◽  
Practice Elements ◽  
Key Issues ◽  
Interdisciplinary Scholarship ◽  
Definition Of

Abstract ‘Histories of Design Pedagogy’ gathers material from across three decades of the Journal of Design History to juxtapose distinct investigations into design education across various geographies, contexts, relationships and methodological concerns. By isolating three overarching themes to structure twelve articles, this introduction also makes an argument towards future design pedagogy, suggesting an Urmodell, or master plan, of elements in design pedagogy that is informed by key issues debated by and through the articles presented. ‘Design Systems and Projects’ addresses the meaning and concept of design, relationships between education and industry, and design training networks. ‘Ethics and Methods’ advocates greater attention to the identities, subjectivities and roles of the designer and of the user as stakeholders in a designed system, the increasing role of research in design practice, elements that affect practice from global design to emerging technologies, and object collections research. The final theme, ‘Critical Histories and Theories’, looks to changes in design history and design studies to inform interdisciplinary scholarship and the future of design practice. Tensions over proportions, boundaries and structures are addressed by this Urmodell, but in the preferred definition of modelling as a mediator, it exists here as a malleable framework over a steadfast solution.

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