Construction of the First Footbridge Made of UHPC in the Czech Republic

2015 ◽  
Vol 1106 ◽  
pp. 8-13 ◽  
Author(s):  
Petr Koukolík ◽  
Jan L. Vítek ◽  
Robert Brož ◽  
Robert Coufal ◽  
Milan Kalný ◽  
...  
Keyword(s):  
Czech Republic ◽  
Experimental Verification ◽  
High Performance ◽  
High Performance Concrete ◽  
Structural Elements ◽  
Ultra High Performance Concrete ◽  
The Czech Republic ◽  
Material Parameters ◽  
Load Carrying ◽  
Utility Vehicle

Footbridge over the Labe River in Celakovice is a cable stayed structure with the main span 156 m long. It is designed for pedestrians, cyclists and also a light utility vehicle may pass over the footbridge. Until now, the footbridge has a record span of the cable stayed structure in the Czech Republic. The ultra high performance concrete (UHPC) was first applied for the load carrying structure on the footbridge at the Czech Republic. The pylons are made of steel and the stays are made of locked coil strands. Since no obligatory codes were available for the design of structures made of UHPC, the extensive experimental verification of material parameters and structural elements was necessary.

Experimental Verification of Pre-Stressed Beams

2014 ◽  
Vol 1054 ◽  
pp. 116-121
Author(s):  
Jan Tichý ◽  
Renata Cvancigerová
Keyword(s):  
Czech Republic ◽  
High Performance ◽  
Applied Research ◽  
High Performance Concrete ◽  
Specific Production ◽  
Ultra High Performance Concrete ◽  
The Czech Republic ◽  
Manufacturing Facility

The paper is a follow-up to previous presentations regarding the experience with ultra-high-performance (UHPC) concrete in the Czech Republic. It will present specific production and testing of pre-stressed beams in the company Skanska a.s. In 2013, the manufacturing facility of the company Skanska a.s. in Štětí, the Prefa plant, produced several series of pre-stressed beams made of ultra-high-performance concrete. The last series of pre-stressed beams was kept in a storage facility in Štětí over winter. In February 2014, destructive tests were carried out on two of the beams in the Štětí facility directly. Another two beams are used for monitoring the long-term changes under continuous load. A description of the tests and their results will be published in the paper. At the same time, a number of accompanying tests were carried out in the Klokner Institute of ČVUT in Prague. The results of these tests will also be mentioned in this paper. The experience and results have been achieved thanks to the grant project no. TA01010269 “Applied research of ultra-high-performance concrete (UHPC) for precast units of structures” subsidized by the Technology Agency of the Czech Republic.

scholarly journals Determination of Axial Capacity for Enhanced Normal and Ultra - High Performance Concrete Columns

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sarmad Shafeeq Abdulqader ◽  
Asmaa Ali Ahmed ◽  
Nawfal Shihab Ahmed
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Peak Load ◽  
Concrete Cover ◽  
Ultra High Performance Concrete ◽  
Concrete Technology ◽  
Compression Load ◽  
Axial Capacity ◽  
Load Carrying ◽  
Normal Strength

Abstract Concrete Technology has been developing for more than a century. One of the most exceptional achievements in concrete technology is the evolving of Ultra-High Performance Concrete (UHPC) which has been a research focus in a wide applications diversity. In this paper, an experimental work has been carried out for investigating the transverse and longitudinal reinforcements’ variation influence on the axial capacity of UHPC columns. Eight columns (five UHPC columns and three Normal Strength Concrete (NSC) columns) have been poured and tested under a concentric axial compression load till a failure is reached. Then, the results are reported herein. The experimental results show that UHPC columns failed in a controlled manner and no concrete chips or a concrete cover spalling are observed. Also, the longitudinal reinforcements have not buckled away beyond the peak load because of the presence of the reinforcing steel fibers in UHPC. Correspondingly, the steel ties spacing proportionally affects the load carrying capacity of columns as presented hereinafter.

Structural Design and Experimental Verification of Precast Columns from High Performance Concrete

2015 ◽  
Vol 1106 ◽  
pp. 110-113 ◽  
Author(s):  
Ctislav Fiala ◽  
Jaroslav Hejl ◽  
Vladimira Tomalova ◽  
Vlastimil Bilek ◽  
Tereza Pavlu ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Experimental Verification ◽  
High Performance ◽  
Energy Savings ◽  
High Performance Concrete ◽  
Concrete Columns ◽  
Building Envelope ◽  
Structural Elements ◽  
Reinforced Concrete Columns ◽  
Common Solution

Paper presents some results of long-term research of a new optimized subtle precast construction system based on high performance silicate composites. The system is particularly aimed for building construction in passive or zero-energy standard. Subtle structural elements from high performance concrete (HPC) can be integrated into building envelope of energy efficient buildings with significant reduction of envelope structure and avoiding risk of thermal bridges. Significant advantages of subtle elements are material and energy savings during production, transport, manipulation and construction on building site.Paper presents experimental verification of connection between columns and beams ensured by Peikko ́s PCs corbels. Moreover, production of two prototypes of high performance fibre reinforced columns over two floors is presented. Prototypes were casted in ŽPSV a.s. plant, Litice nad Orlicí in June 2014. Complex LCA analysis of three various reinforced concrete columns was performed. Analysis covers construction life phase. Consequently, environmental impacts of assessed variants were compared and evaluated. Results show that it is possible to reduce some impacts on the environment from 16 up to 65% in comparison with common solution of reinforced concrete columns due to the utilization of excellent mechanical properties of high performance concrete that enables the design of subtle structural elements.

Retrofitting and Strengthening Interventions of RC Members Using Ultra High Performance Concrete (UHPC)

2018 ◽  
Author(s):  
Wee Teo ◽  
Kazutaka Shirai ◽  
Yin Hor
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Shear Cracks ◽  
Ultra High Performance Concrete ◽  
Flexural Failure ◽  
Load Carrying ◽  
Rc Slab ◽  
Shear Cracking ◽  
Rc Slabs ◽  
Ultimate Load Carrying Capacity

<p>Two test series with various UHPC strengthening interventions were conducted in this study to investigate the behaviour of composite reinforced concrete (RC) slabs strengthened with UHPC. The first, RE series is a retrofit interventions, tested UHPC as patch material for repairing deteriorated concrete structures. As for the second, OV series is a UHPC overlay interventions, was used to strengthen soffit of RC slab members. The results showed that, in RE series, UHPC safeguard against diagonal cracking compare to conventional RC slab. The UHPC exhibited excellent energy absorption with extensive deflection hardening and ductility during the post cracking range. In OV series, all slabs showed formation of diagonal shear cracks and sign of debonding modes. The UHPC overlay delayed the development of shear cracking. The ultimate load carrying capacity and tendency of flexural failure increase with the overlay thickness.</p>

Cable-Stayed Footbridge with UHPC Segmental Deck

2014 ◽  
Vol 629-630 ◽  
pp. 64-70 ◽  
Author(s):  
Milan Kalný ◽  
Vaclav Kvasnička ◽  
Jan Komanec ◽  
Jan L. Vítek ◽  
Robert Broz ◽  
...  
Keyword(s):  
Life Cycle Cost ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Light Weight ◽  
Ultra High Performance Concrete ◽  
Ongoing Research ◽  
The Czech Republic ◽  
The Public ◽  
Design And Implementation

Ongoing research and development of ultra-high performance concrete (UHPC) in the Czech Republic has been utilized in design and implementation of light-weight segmental deck of the cable-stayed footbridge over the Labe River in Celakovice with main span of 156 m. Detailing, design issues, construction method and efficiency of using UHPC on this large span lightweight bridge is described in the paper. The superstructure of the Celakovice footbridge was completed in the December 2013 and the bridge was opened for the public in April 2014. Main advantages of this project is not only low maintenance and reasonable life cycle cost but also favourable tender price which was achieved by the contractor Metrostav a.s. due to combination of high-strength modern materials steel and UHPC.

Prestressed I-Beams Made of Ultra-High Performance Concrete for Construction of Railway Bridges

2014 ◽  
Vol 578-579 ◽  
pp. 776-778
Author(s):  
Petr Tej ◽  
Jiří Kolísko ◽  
Petr Bouška ◽  
Miroslav Vokáč ◽  
Jindřich Čech
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Load Test ◽  
Bottom Flange ◽  
Structural Elements ◽  
Ultra High Performance Concrete ◽  
Actual Structure ◽  
Railway Bridges ◽  
Four Point Bending

This paper focuses on research into prestressed I-beams made of ultra-high-performance concrete, which are designed to be structural elements in small and medium span railway bridges. Prestressed concrete I-beams are designed with ten prestressing cables in the bottom flange. The prestressed beams are laid close together in the actual structure with panels inserted between them. The entire structure will subsequently become monolithic. At the present time, I-beams made of rolled steel are commonly used as structural elements in this type of structure. The advantage of these types of structures lies in their having a low construction height. This paper presents a computer and experimental analysis of the loading of UHPC prestressed I-beams. For the purpose of the experiments, several specimens of 7 m span were made. The specimens were subsequently tested in the laboratory in four-point bending tests. The paper presents the process and results of the experiments. Simultaneously with the experiments, computer analyses were created in which optimization of the material and geometric parameters of the beams were carried out. The paper demonstrates the correspondence of the experimental and computer-simulated load test results.

Behavior of Prestressed Ultra High Performance Concrete Beams

2008 ◽  
Vol 400-402 ◽  
pp. 385-390 ◽  
Author(s):  
Jian Yang ◽  
Zhi Fang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Strain Curve ◽  
Experimental Program ◽  
Load Carrying Capacity ◽  
Ultra High Performance Concrete ◽  
Stress Strain Curve ◽  
Structure Response ◽  
Flexural Response ◽  
Load Carrying

An experimental program was formulated to investigate the characteristics of complete stress-strain curve of UHPC in uniaxial compression and flexural behaviors of prestressed UHPC beams. The particular focus was the influence of the partial prestress ratio and jacking stress on the flexural response of UHPC beams. The tests of beams demonstrated that the UHPC beams have an excellent behavior in load carrying capacity, crack distribution and deformability; their ultimate deflection can reach 1/34～1/42 of the span. Based on this investigation, theoretical correlations for the prediction structure response of UHPC beams are proposed.

Cyclic Test of Concrete Bridge Column Utilizing Ultra-High Performance Concrete Shell

2020 ◽  
Vol 2674 (2) ◽  
pp. 158-166 ◽  
Author(s):  
Nerma Caluk ◽  
Islam M. Mantawy ◽  
Atorod Azizinamini
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Plastic Hinge ◽  
Protective Layer ◽  
Structural Elements ◽  
Ultra High Performance Concrete ◽  
Reinforced Concrete Column ◽  
Construction Time ◽  
The North ◽  
Drift Ratio

Ultra-high performance concrete (UHPC) is a durable material that can be used in constructing new and unique structural elements. This research utilizes UHPC to construct prefabricated shells that act as stay-in-place forms for bridge columns and eliminate the use of traditional formwork. These innovative structural elements reduce the on-site construction time, improve the structural performance of the column, and act as a protective layer in aggressive environments. Generally, during the construction process, the prefabricated UHPC shell is placed around the column reinforcement, which is fabricated using conventional methods. To connect the UHPC shell and column reinforcement with the footing and footing dowels, a step made of UHPC is utilized. The UHPC step connection is designed to shift the plastic hinge away from the column-to-footing interface. In the next stage, normal concrete is cast inside the shell, forming a concrete-filled UHPC shell. The final stage of construction involves placing and connecting a prefabricated cap-beam using the same UHPC step connection. The column specimen was tested under constant axial load and incremental lateral load. In this test, the UHPC shell cracked on the north side at a drift ratio of 3%; however, the column had a significant capacity and behaved similarly to a conventional reinforced concrete column during higher cycles of drift ratios. The test was completed after the column had reached a drift ratio of 7.5% when the first bar ruptured. No damage occurred in the footing and UHPC step which proved that the design was successful in shifting the plastic hinge away from the column-to-footing interface.

Push-Out Test on Shear Connectors Embedded in UHPC

2013 ◽  
Vol 351-352 ◽  
pp. 50-54 ◽  
Author(s):  
Jee Sang Kim ◽  
Sang Hyeok Park ◽  
Chang Bin Joh ◽  
Jong D.K. Kwark ◽  
Eun Suk Choi
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Experimental Investigations ◽  
Load Carrying Capacity ◽  
Ultra High Performance Concrete ◽  
Shear Connectors ◽  
Aspect Ratios ◽  
High Durability ◽  
Load Carrying ◽  
Push Out

The various push-out tests have been performed to investigate the load carrying capacity and ultimate behavior of headed studs in UHPC (Ultra High Performance Concrete), which has high compressive and tensile strength as well as high durability compared to ordinary concrete. The test program included the studs with a diameter of 16mm and 22mm for various aspect ratios (height to depth ratio of a stud) and cover depths. This paper presents the main results of the experimental investigations.

Experimental Verification of Subtle Frame Components Prototypes from High Performance Concrete for Energy Efficient Buildings

2016 ◽  
Vol 249 ◽  
pp. 301-306
Author(s):  
Ctislav Fiala ◽  
Jaroslav Hejl ◽  
Vlastimil Bílek ◽  
Jan Růžička ◽  
Tomáš Vlach ◽  
...  
Keyword(s):  
Cross Sections ◽  
Experimental Verification ◽  
High Performance ◽  
Energy Savings ◽  
High Performance Concrete ◽  
Building Envelope ◽  
Bending Test ◽  
Structural Elements ◽  
Load Bearing ◽  
Energy Efficient Buildings

Mechanical properties of high performance concrete (HPC) enable design of subtle structural elements. Subtle HPC frame concept comes from the effort to integrate load bearing elements into building envelope in order to reduce risks of thermal bridges. Substantial advantages of subtle structural elements are material and energy savings during production, transportation, manipulation and assembling. Paper presents preparation and implementation of construction of experimental frame at University Centre UCEEB in Buštěhrad. Individual structural elements were made in prefa plant ŽPSV a.s. in Litice nad Orlicí. Construction of frame prototype is the result of long term research when the vertical and horizontal structural elements and their connections were successively designed and experimentally verified. This article shows experimental results of horizontal load bearing structures - floor panels and beams - in detail. Samples were tested by four-point bending test and also creep of floor panels was measured. Accomplished calculations, experimental verification and analysis have showed that subtle HPC frame is the effective solution from reliability aspects as well as from environmental and economical parameters. Minimal columns cross sections enable their complete implementation into building envelope and they also contribute to high quality architectonic solution of buildings interiors.

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