The Study of Diaphragm Beam Influence to Load Transverse Distribution of T-Beam Bridge

2011 ◽  
Vol 368-373 ◽  
pp. 557-562
Author(s):  
Guo Hui Gao ◽  
Zhen Yu Xie ◽  
Ran He ◽  
Jian Yi Song
Keyword(s):  
Theoretical Data ◽  
Mechanical Analysis ◽  
Concentrated Load ◽  
Transverse Distribution ◽  
Finite Element Software ◽  
Bridge Model ◽  
Diaphragm Beam ◽  
Beam Bridge ◽  
Bridge Models ◽  
T Beam

Diaphragm beam has grate influence to load transverse distribution factors of T-beam bridge. Two steel T-beam bridge models were made in this article, one have diaphragm beam and the other one have not. Concentrated load was applied to both of them, and mechanical analysis of the T-beam bridge model was carried out by finite element software. Compared with experiment data and theoretical data, it shows that: when the concentrated load was applied to mid-span of 1#,2# and 3# beam of the two kind bridges, the 1#,2# and 3# beam load transverse distribution factors of T-beam bridge without diaphragm beam is larger than that of T-beam bridge with diaphragm beam by 19.3%~23.2%、25.3%~30.6% and 48.1%~50.1% respectively.

scholarly journals Development of heavy truck models and their effects on girder bridges

2021 ◽  
Author(s):  
Lang Liu ◽  
◽  
Lexian Zhang ◽  
Jie Wang ◽  
Hong Yang ◽  
...  
Keyword(s):  
Bending Moment ◽  
Highway Bridges ◽  
Load Effect ◽  
Girder Bridges ◽  
Heavy Trucks ◽  
Bridge Model ◽  
Potential Factor ◽  
Heavy Truck ◽  
Beam Bridge ◽  
T Beam

The traffic on highway bridges has been increasing in both volume and magnitude, which even has become one of the main reasons leading to damages and collapse of bridges. Most of the existing regulations for overloading checking are carried out based on various limits of gross vehicle weights and axle loads. However, the results of relevant researches show that weight is only a potential factor but not the dominating factor in threatening the safety of bridges. In this study, the concept of load-effect-based heavy truck is proposed for overloading checking, and then three years of WIM data were collected and used to develop heavy truck models for each truck type, based on the understanding of the characteristics and configurations of heavy trucks as well as the distribution of their main parameters. Furthermore, the typical heavy truck models selected and their possible combinations are applied to a simply supported pre-stressed concrete T-beam bridge model with three loading levels, considering one-lane, two-lane and three-lane loaded respectively, then the induced load effect, deflection and stress are discussed for 20 loading cases. The results show the bending moment caused by heavy trucks moving on multiple lanes is 1.6 times the value of the standard truck model in Chinese specification, and the eccentric loading due to a very heavy vehicle moving on single lane usually lead to more severe effect.

Towards an efficient method of predicting vehicle-induced response of bridge

2016 ◽  
Vol 33 (7) ◽  
pp. 2067-2089 ◽  
Author(s):  
Zhen Sun ◽  
Zilong Zou
Keyword(s):  
Iterative Method ◽  
Design Methodology ◽  
Computational Algorithm ◽  
Interaction Force ◽  
Induced Response ◽  
Vehicle Model ◽  
Content Type ◽  
Bridge Model ◽  
Beam Bridge ◽  
Bridge Models

Purpose The purpose of this paper is to present a practical and efficient iterative method for predicting vehicle-induced response of bridge. Design/methodology/approach The vehicle-bridge interaction (VBI) problem is generalized mathematically and a computational algorithm for VBI is proposed. This method rests on an iterative procedure, which utilizes the whole interaction process for iteration. By this means, vehicle and bridge become totally uncoupled and are only linked by the contact force history. This method provides flexibility to choose simplified or refined vehicle and bridge models for the VBI problem, as well as open options for different commercial FEM software without specialized codes. Findings The method is verified through two numerical examples. The first example uses a simple 1D beam bridge model, which illustrates the procedure of this method and demonstrates its fast convergence in several iterations. The second example employs a realistic full 3D finite element bridge model, which shows that the method easily connects complex FEM bridge models in ABAQUS with a calibrated vehicle model in Matlab. The dynamic response of the bridge is reliably calculated within only a few iterations. Originality/value The proposed iterative method separates vehicle and bridge into independent subsystems in the computational process, thus providing more flexibility to utilize commercial FEM softwares. Its efficiency is realized through choosing the whole interaction force process for iteration, which considerably reduces the iteration steps.

scholarly journals A Mathematical Model to Simulate Static Characteristics of T-Beam Bridge with Wide Flange

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Xiaomeng Zang ◽  
Genhui Wang ◽  
Jianchang Li ◽  
Rongcheng Hou ◽  
Yanan Gan ◽  
...  
Keyword(s):  
Mechanical Analysis ◽  
Static Characteristics ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Stress Equilibrium ◽  
Lag Effect ◽  
Natural Boundary Conditions ◽  
Beam Bridge ◽  
T Beam ◽  
Warping Stress

This study considers various factors, such as shear lag effect and shear deformation, and introduces the self-stress equilibrium for shear lag warping stress conditions to analyze the static characteristics of T-beam bridges accurately. In the mechanical analysis, three generalized displacement functions are applied, and the governing differential equations and natural boundary conditions of the static characteristics of T-beams are established on the basis of the energy variational principle. In the example, the influences of the shear lag effect, different load forms, and span ratio on the mechanical properties of T-beam bridges are analyzed. Therefore, the method of this study enriches and develops the theoretical analysis of T-beams, and it plays a certain guiding role in designing such a structure.

Comparative Study of T Beam Bridge with Conventional Method and Finite Element Analysis

2019 ◽  
Vol 15 (1) ◽  
pp. 62-70
Author(s):  
Raghabendra Yadav ◽  
Binay Kumar Sah ◽  
Indra Narayan Yadav ◽  
Dinesh Kumar Gupta
Keyword(s):  
Finite Element ◽  
Conventional Method ◽  
Concrete Slab ◽  
Bending Moment ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Analysis And Design ◽  
Finite Element Software ◽  
Beam Bridge ◽  
T Beam

The most commonly and popular type of bridge used in Nepal is T beam bridge due to it's simple in design, construction and maintenance than other types. T-beam Bridge comprises of a concrete slab integral with girders. This type of bridges is more preferred when it comes to connectivity to short distances. So, it is necessary to update the analysis and design methods. Here, in this paper, there is an attempt to study the comparison of maximum bending moment due to live load in a girder and slab bridge for varying span length as 15m, 20m and 25m respectively of T Beam bridge using conventional method. The same bridge is analyzed as a three-dimensional model in finite element software as SAP2000, apply the same loading done for conventional methods and compared the results. The maximum bending moment results obtained from finite element model are lesser than Courbon's method which looks more conservative.

Experimental study on blast damage of RC T-beam bridge

Sensor Review ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sheng Peng ◽  
Lu-jun Cai ◽  
Tian-hua Jiang ◽  
Xu Kai
Keyword(s):  
Damage Evaluation ◽  
Concrete Material ◽  
Content Type ◽  
Blast Damage ◽  
Damage Repair ◽  
Expansion Stage ◽  
Technical Specifications ◽  
Beam Bridge ◽  
Bridge Models ◽  
T Beam

Purpose The purpose of this paper is to investigate the explosive performance and explosion damage mechanism of T-beam bridge structure. Design/methodology/approach On the basis of the existing specification, two T-beam bridge models were designed and fabricated. Test specimens of different explosive dosage and different blast height were carried out. The mechanical process, failure mode, blast damage model, damage identification mechanism and blast evolution law and quantitative evaluation were taken into account. Findings The results revealed that the web plate fracture failure is the key to the unstable failure of the whole T-beam bridge. The explosion failure phenomenon and blast damage evaluation criterion of RC T-beam bridge was divided into five stages: the original cracks stage of concrete material (D = 0 ∼ 0.1), the fractures initiation stage of concrete material (D = 0.1 ∼ 0.3), the stable expansion stage of cracks in concrete material (D = 0.3 ∼ 0.55), the unstable expansion stage of cracks in concrete material (D = 0.55 ∼ 0.8), the explosion fracture of steel bars and the overall instability and damage of the bridge (D = 0.8 ∼ 1.0), which can also be described as basically intact, slight damage, moderate damage, severe damage and collapsed. Social implications The research result will provide basis for the antiknock evaluation and damage repair technical specifications of the RC T-beam bridge. Originality/value The research results of damage evaluation serve as a basis for damage repair and reinforcement of bridge structures after explosion.

Study on Damage Effect of Concrete Bridge Model under Blast Loading

2015 ◽  
Vol 777 ◽  
pp. 116-120 ◽  
Author(s):  
Lei Chen ◽  
Tian Hua Jiang ◽  
Jie Gong ◽  
Lu Jun Cai
Keyword(s):  
Rapid Development ◽  
Blast Loading ◽  
Damage Effect ◽  
Bridge Structure ◽  
Bridge Model ◽  
Bridge Damage ◽  
Beam Bridge ◽  
The Impact ◽  
T Beam ◽  
Damage Rule

With the rapid development of transportation, the vulnerability of bridge under blast loading has more and more attracted people's attention. To ensure the safety of the bridge under the impact of blast loading is very important. This article describes the current situation of bridge structure antiknock research in China and other countries. What’s more, pointed out the shortcomings of existing research and presented that the antiknock research of bridge structure should combine numerical simulation with model test at the same time. This article researches the stress, strain and bridge damage rule of 1: 5 model of T-beam Bridge under explosion effect of small doses explosive.

Dynamic Instability Analysis and Design Charts of Curved Panels with Linearly Varying Periodic In-Plane Load

2021 ◽  
pp. 2150130
Author(s):  
G. Patel ◽  
A. N. Nayak ◽  
A. K. L. Srivastava
Keyword(s):  
Finite Element ◽  
Boundary Conditions ◽  
Dynamic Instability ◽  
Excitation Frequency ◽  
Instability Region ◽  
Concentrated Load ◽  
Simply Supported ◽  
Finite Element Software ◽  
Design Charts ◽  
Curved Panels

The present paper reports an extensive study on dynamic instability characteristics of curved panels under linearly varying in-plane periodic loading employing finite element formulation with a quadratic isoparametric eight nodded element. At first, the influences of three types of linearly varying in-plane periodic edge loads (triangular, trapezoidal and uniform loads), three types of curved panels (cylindrical, spherical and hyperbolic) and six boundary conditions on excitation frequency and instability region are investigated. Further, the effects of varied parameters, such as shallowness parameter, span to thickness ratio, aspect ratio, and Poisson’s ratio, on the dynamic instability characteristics of curved panels with clamped–clamped–clamped–clamped (CCCC) and simply supported-free-simply supported-free (SFSF) boundary conditions under triangular load are studied. It is found that the above parameters influence significantly on the excitation frequency, at which the dynamic instability initiates, and the width of dynamic instability region (DIR). In addition, a comparative study is also made to find the influences of the various in-plane periodic loads, such as uniform, triangular, parabolic, patch and concentrated load, on the dynamic instability behavior of cylindrical, spherical and hyperbolic panels. Finally, typical design charts showing DIRs in non-dimensional forms are also developed to obtain the excitation frequency and instability region of various frequently used isotropic clamped spherical panels of any dimension, any type of linearly varying in-plane load and any isotropic material directly from these charts without the use of any commercially available finite element software or any developed complex model.

A Study on the Restrainer for Isolated Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 5208-5213
Author(s):  
Yong Feng Du ◽  
Xiao Yu Sun
Keyword(s):  
Lateral Displacement ◽  
Time History ◽  
Nonlinear Characteristics ◽  
Isolation System ◽  
Finite Element Software ◽  
Continuous Beam Bridge ◽  
History Analysis ◽  
Isolated Bridge ◽  
Isolated Bridges ◽  
Beam Bridge

As a result of adopting isolated bearings, it is inevitable to increase the lateral displacement of the superstructure and the chance of girder falling. However, the shear keys that just satisfies the structural design is far from meeting the requirements of displacement of isolated bridge restrictions. On account of this, given the nonlinear characteristics of bearings and the restrainer, the authors make the study on the "damping rubber with coupling collar" restrainer, and then establish isolation system model of continuous beam bridge with finite element software named Midas. Meanwhile, the effect of the restrainer on the dynamic response of isolated bridges is presented by time-history analysis, which reveals the great value in the application of limiting displacement of isolated bridge.

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