Serviceability Assessment of Composite Footbridge Under Human Walking and Running Loads

2015 ◽  
Vol 74 (4) ◽  
Author(s):  
Faraz Sadeghi ◽  
Ahmad Beng Hong Kueh
Keyword(s):  
Concrete Slab ◽  
Model Verification ◽  
Human Walking ◽  
Steel Beams ◽  
Vibration Source ◽  
Design Standards ◽  
Reinforced Concrete Slab ◽  
Codes Of Practice ◽  
Current Design ◽  
Vibration Responses

Footbridge responses under loads induced by human remain amongst the least explored matters, due to various uncertainties in determining the description of the imposed loadings. To address this gap, serviceability of an existing composite footbridge under human walking and running loadings is analyzed dynamically in this paper employing a finite element approach. The composite footbridge is made-up of a reinforced concrete slab simply supported at two ends on top of two T-section steel beams. To model the walking and running loads, a harmonic force function is applied as the vibration source at the center of the bridge. In the model verification, the computed natural frequency of footbridge exhibits a good agreement with that reported in literature. The vibration responses in terms of peak acceleration and displacement are computed, from which they are then compared with the current design standards for assessment. It is found that the maximum accelerations and displacements of composite footbridge in presence of excitations from one person walking and running satisfy the serviceability limitation recommended by the existing codes of practice. In conclusion, the studied footbridge offers sufficient human safety and comfort against vibration under investigated load prescription.

scholarly journals Vibration Characteristics of Composite Footbridges under Various Human Running Loads

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Faraz Sadeghi ◽  
Ahmad Kueh ◽  
Ali Bagheri Fard ◽  
Nasim Aghili
Keyword(s):  
Vibration Characteristics ◽  
Model Verification ◽  
Structural Performance ◽  
Step Frequency ◽  
Design Standards ◽  
Maximum Acceleration ◽  
Current Design ◽  
Vibration Responses ◽  
Human Running ◽  
Good Agreement

Various types of human running dynamic loads are numerically studied and compared to assess vibration characteristics of the light and slender composite footbridges. Running, which is a common human activity, has been categorized with respect to its intensity into jogging, normal running, and sprinting. To explore the footbridge’s performance, the vibration responses are investigated through a series of analyses in terms of the peak accelerations and displacements. In the model verification, the acquired first natural frequency of structure has shown good agreement with the value reported in the literature. The structural performance of the slender composite footbridge is then evaluated with regard to the serviceability requirement given by the current design standards. It is generally found that the maximum acceleration of the composite footbridge due to the excitation of one person running varies under different running types because of diversities in the velocity and the step frequency. Furthermore, it is shown that the investigated structure provides sufficient human comfort against vibrations for all the examined three types of running loads.

Steel-Reinforced Concrete Floors With The Use Of Bent Steel Profiles

2020 ◽  
pp. 10-14
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Concrete Strength ◽  
Theoretical Research ◽  
Steel Beams ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Slab ◽  
Steel Reinforced Concrete ◽  
Advantages And Disadvantages ◽  
Concrete Strengthening

The issues of designing a steel-reinforced concrete floor using bent steel profiles are considered. The steel-reinforced concrete flooring consists of a monolithic reinforced concrete slab arranged on a removable formwork, and steel bent profiles. The removable formwork during the concreting process rests on steel beams without additional mounting posts in the floor span. Steel beams accept the weight of the formwork and concrete during the pouring, working on bending. After concrete strengthening, they mainly work on stretching as part of composite steel-reinforced concrete structure. The article has identified the advantages and disadvantages of steel-reinforced concrete flooring with the use of light steel thin-walled bent profiles. Checking the strength of the beam at the concreting stage and evaluating the load-bearing capacity of the floor after the concrete strength is set confirm the performance of this structure. Using the regulatory methodology for SP 266.1325800.2016, the area of implementation of steel and concrete flooring with CFS beams and the nomenclature of applied steel beams have been established. For practical application of the presented design, it is recommended to conduct experimental and theoretical research and develop engineering methods.

scholarly journals EXPERIMENTAL LOAD TESTS OF REINFORCED CONCRETE SLAB

2016 ◽  
Vol 78 (5-5) ◽  
Author(s):  
Vojtech Buchta ◽  
Roman Fojtik ◽  
Jan Hurta
Keyword(s):  
Concrete Slab ◽  
Reinforced Concrete Slab ◽  
Design Models ◽  
Codes Of Practice ◽  
The World ◽  
Internal Forces ◽  
Load Tests ◽  
Foundation Structure ◽  
Research Analysis

Foundation structures, their testing and modelling their behavior is a wide area to research. Analysis of interaction between the subsoil and the foundation structures has been developed for many years. For the determination of stress in foundation structure is needed to determine the influence of the stiffness respectively pliability of subsoil to structural internal forces, and vice versa, how the stiffness of the foundation structure affects the resulting subsidence. A lot of different elements are tested or modeled in the world. Previous researches on loading of reinforced slabs have shown a number of phenomena significantly influencing their strength and behaviour. However, no general agreement is yet found on a physical theory (either in codes of practice or in design models) suitably describing the interaction between the subsoil and the foundation structures.  

scholarly journals Establishing the Optimal Solution for Obstacle Crossings. Application for Bridge Km.14+162 Placed on the Bypass of Bistrita City

2017 ◽  
Vol 13 (1) ◽  
pp. 12-20
Author(s):  
Radu Adrian Iordanescu
Keyword(s):  
Cross Section ◽  
Concrete Slab ◽  
Mathematical Optimization ◽  
Optimal Solution ◽  
Optimization Techniques ◽  
Point Of View ◽  
Steel Beams ◽  
Technical Solution ◽  
Reinforced Concrete Slab ◽  
Local Road

Abstract The Bistrita city bypass crosses obliquely at km 14+162 the Bistrita river and a local road. In the area where the bridge is situated the river has a width of about 50.00m and the local road has 5.00m, being located at 12.00m from the bank of Bistrita. The bridge should provide a roadway that is 7.80m wide and two sidewalks of 1.50m. The challenge is to design a bridge that allows the crossing of the two barriers (the river and the local road) in the most efficient way possible from an economical point of view, but in such a way that both the geometrical constraints and the design requirements contained in the family of the European standards Eurocodes are respected. In order to achieve this goal, the author has investigated the design situation by comparing different possible technical solutions, by conducting a series of parametric studies and by utilizing mathematical optimization techniques. Following these investigations a 100.00m long bridge resulted. The superstructure is a continuous beam with three spans: 20.00m + 60.00m + 20.00m and consists of a composite steel - concrete deck. The deck cross section is composed of two steel beams with variable height and a reinforced concrete slab disposed on top. This configuration of the superstructure leads to the development of negative reaction forces in the bearings located at the end points of the deck. The study has covered 8 key steps as follows: - Establishing the technical solution. - Establishing the number and the length of the spans. - Setting the static scheme. - Determining the optimal cross section of the steel beams. - Setting longitudinal beam geometry. - Establishing the number of beams in the cross section. - Determining the optimal mounting order of the concrete slabs. - Establishing the optimal type and distribution of the bearing devices.

scholarly journals To determine the optimal size of the elements of complex overlap

2019 ◽  
Vol 97 ◽  
pp. 04048
Author(s):  
Vitaly Kuznetsov ◽  
Yulia Shaposhnikova
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Strength Characteristics ◽  
Steel Beams ◽  
Optimal Size ◽  
Optimal Parameters ◽  
Limit States ◽  
Reinforced Concrete Slab ◽  
Object Of Study ◽  
Center Cell

The article discusses the possibilities of optimizing the size of elements of reinforced concrete ceilings along. The optimization of the overlap consists in finding such parameters of the reinforced concrete slab, profiled flooring and steel beams, in which their strength is fully used. For ceilings with steel beams included, the dimensions of the sections of the elements and their strength characteristics are determined by the requirements of the limit states of the second group (deflections), and the calculation of the forces in the slab and beams and strength calculations are performed taking into account the geometric and strength characteristics established from the calculation of deformations. To clarify the features of the calculation and verification of the main provisions, a numerical experiment was carried out, where the center cell of the steel concrete slab along metal rolling beams was selected as the object of study. Formulas are obtained for determining the forces using predetermined dimensions of the components of the overlap based on satisfying the requirements of the 2 groups of limit states. These studies can serve as a basis for further research on the search for optimal parameters of complex floors.

scholarly journals Experimental Investigation of Impact Concrete Slab on the Bending Behavior of Composite Bridge Girders with Sinusoidal Steel Web

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 273 ◽  
Author(s):  
Marcin Górecki ◽  
Krzysztof Śledziewski
Keyword(s):  
Steel Plate ◽  
Concrete Slab ◽  
Bending Moment ◽  
Bridge Girders ◽  
Steel Beams ◽  
Reinforced Concrete Slab ◽  
Plate Girders ◽  
Common Solution ◽  
Industrial Buildings ◽  
Corrugated Web

Until recently, steel plate girders with corrugated steel members were used primarily as poles and girders in the construction of industrial buildings. Currently, they are also being used in the construction of bridges. Compared to traditional steel and rolled girders, steel plate girders weigh less and are more stiff, while also having a neater appearance. In this paper, the results of an experimental study are present. The aim of the study was to determine the behavior of a bridge girder with sinusoidal web geometry when subjected to a bending moment. The study was focused on a composite steel and concrete structure with pin connections, which is currently the most common solution. Three near-real scale beams were subjected to bending tests. The study found that composite corrugated-web steel beams and non-composite corrugated-web steel beams showed similar forms of failure. A reinforced concrete slab did not prevent web stress concentration at the point of connection with the flange. Furthermore, the study indicates that corrugated steel webs in bridge girders can have a much smaller thickness (less than 8 mm) compared with the traditional solution.

Dimension and Frequency Profiles of Concrete Highway Bridges in New Madrid Region of Southeastern Missouri

1997 ◽  
Vol 1594 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Ralph Alan Dusseau
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Highway Bridges ◽  
Ambient Vibration ◽  
Earthquake Hazards ◽  
Empirical Formulas ◽  
Reinforced Concrete Slab ◽  
Box Girder ◽  
Bridge Spans ◽  
New Madrid

The results of a study funded by the U.S. Geological Survey as part of the National Earthquake Hazards Reduction Program are presented. The first objective of this study was the development of a database for all 211 highway bridges along I-55 in the New Madrid region of southeastern Missouri. Profiles for five key dimension parameters (which are stored in the database) were developed, and the results for concrete highway bridges are presented. The second objective was to perform field ambient vibration analyses on 25 typical highway bridge spans along the I-55 corridor to determine the fundamental vertical and lateral frequencies of the bridge spans measured. These 25 spans included six reinforced concrete slab spans and two reinforced concrete box-girder spans. The third objective was to use these bridge frequency results in conjunction with the dimension parameters stored in the database to develop empirical formulas for estimating bridge fundamental natural frequencies. These formulas were applied to all 211 Interstate highway bridges in southeastern Missouri. Profiles for both fundamental vertical and lateral frequencies were then developed, and the results for concrete highway bridges are presented.

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