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DURA® UB-X650 - Universal Beam X650
Description
DURA® UB-X650 Universal Beam is a newly innovated product suitable especially for Industrial Building System (IBS) such as buildings or warehouses construction which required light-weight, long span and durable system. DURA® UB-X650 made from the revolutionary composite material of ultra-high performance concrete and high-carbon-high-tensile steel fibres (UHPdC). It is an excellent solution for buildings with long span requirements of up to 22 m without intermediate support.
Features
- DURA® UB-X650 consists of P.C. strands in longitudinal direction and typically prestress to 70~80% of the 'guaranteed' tensile strength of the strands. Strands used are 15.2 mm diameter 7-wire super strands (low relaxation) complying with AS 1311; with a guaranteed tensile load of 250 kN and ultimate breaking load of 270 kN.
- The UHPdC used for the DURA® UB-X650 has a characteristic compressive strength range between 120 to 140 MPa, and characteristic flexural strength of 20 MPa.
- DURA® UB-X650 eliminates the use of conventional steel reinforcing bars and stirrups (except starter-bars are provided at the end regions for connection purpose). All steel fibres used are made from high carbon steel wires with tensile strength over 2300 MPa.
Advantages of DURA® UB-X650
- DURA® UB-X650 is highly durable and impermeable. It is therefore suitable for use even in harsh environments.
- DURA® UB-X650 used "un-cracked section" design approach at SLS. Thus it further assures its serviceability and durability.
- DURA® UB-X650 is at least 2 times lighter than conventional precast RC beam (see Figure 2). Thus lead to ease of handling/transportation and installation.
- Scaffolding, props or formwork may or may not required over the supports (depends of design).
- Reducing construction site activities, improving safety margins and eliminating in-situ casting work (except sealing of the construction joints and some minor details).
- DURA® UB-X650 is guaranteed to be volumetrically stable as they are steam-cured to minimized creep. This process also accelerates all long term shrinkage of the UHPdC.
- DURA® UB-X650 frames can be produced to desired length as specified by the designers.
- Due to its high durability, high ductility and high fatigue strength, it provides excellent resistance against impact and abrasion loads.
- DURA® UB-X650 supports the 'Green' vision as it is a more environmentally freely material compare to conventional beam such as RC beam and structural steel beam (see Figure 2).
- DURA® UB-X650 used special fiber to provide sufficient resistance in the event of fire.
Figure 3: Cross Section |
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Table 1: Technical Data for DURA® UB-X650
Unit | UB650 | ||
Self-Weight | G | kg/m | 240 |
Length | L | m | 8 ~ 22 ¯ |
Sectional Area | Ag | x 103 mm2 | 100 |
Neutral Axis | ytop | mm | 325 |
ybot | mm | 325 | |
2nd Moment of Inertia | Ixx | x 109 mm4 | 6.708 |
Iyy | x 109 mm4 | 1.336 | |
Elastic Section Modulus X-X | Ztop,xx | x 106 mm3 | 20.64 |
Zbot,xx | x 106 mm3 | 20.64 | |
Torsion Constant | J | x 106 mm3 | 193.83 |
Warping Constant | Iw | x 1012 mm3 | 110.4 |
¯ - Can be customized
Table 2: Design Capacity of DURA® UB-X650
Unit | UB650 | |||||||
2/6S15 | 2/7S15 | 2/8S15 | 2/9S15 | 2/10S15 | 2/11S15 | |||
Top Strands | Nos. | 2 | 2 | 2 | 2 | 2 | 2 | |
Bottom Strands | Nos. | 6 | 7 | 8 | 9 | 10 | 11 | |
Cracking Moment | Mcr | kNm | 593 | 673 | 743 | 824 | 902 | 970 |
Ultimate Moment | Mu | kNm | 933 | 1085 | 1238 | 1386 | 1515 | 1657 |
Recommended Design Bending Moment (f = 0.8) | M* | kNm | 746 | 868 | 990 | 1109 | 1212 | 1326 |
Cracking Shear Strength | Vcr | kN | 225 | 225 | 225 | 225 | 225 | 225 |
Ultimate Shear Strength | Vu | kN | 350 | 350 | 350 | 350 | 350 | 350 |
Recommended Design Shear Strength (f = 0.7) | V* | kN | 245 | 245 | 245 | 245 | 245 | 245 |
↑ - f = strength reduction factor as per AS3600-2001
Figure 4: Experimental Data

Application
- composite with steel beams ;
- composite with in-situ cast RC slab ;
- composite with full precast RC slab;
- composite with half precast slab.