DURA® UB-X650 - Universal Beam X650
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.
- 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 2:Cost and environmental impact comparisons
|Figure 3: Cross Section|
Table 1: Technical Data for DURA® UB-X650
|Length||L||m||8 ~ 22 ¯|
|Sectional Area||Ag||x 103 mm2||100|
|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
|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
- composite with steel beams ;
- composite with in-situ cast RC slab ;
- composite with full precast RC slab;
- composite with half precast slab.