Staff Login


DURA® UB-X650 - Universal Beam 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 1: DURA® UB-X650 used in portal frame
Figure 2:Cost and environmental impact comparisons

Figure 3: Cross Section
x650-3-cross section

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
x650-6-experimental data


  1. composite with steel beams ;
  2. composite with in-situ cast RC slab ;
  3. composite with full precast RC slab;
  4. composite with half precast slab.



© 2009-2021 by GPIUTMD