Newmark Structural Engineering Laboratory

Department of Civil and Environmental Engineering

College of Engineering

University of Illinois at Urbana-Champaign

   
 
   
         
 
 
Student Instrumentation Workshop
Machine Shop
Instrumentation
Hydraulic Equipment
Testing Floor
Structural Testing Hardware

Testing Floor

 

The Newmark testing floor encompasses a 15 x 40 m2 (49.2 x 131.2 ft2) area. The infrastructure of the floor is a 5 m (16.4 ft) deep concrete box girder design (right). The girder mass is approximately 2.72 x 106 kg (3 x 103 tons) and has been implemented for use on tests of full-scale bridge girders. The floor also acts as an effective reaction structure for dynamic experiments and it is now being used to support the new 6.80 x 105 kg cranes with capacities of 1.81 x 104 kg (20 tons) and 3.62 x 104 kg (40 tons) with a clear height of 9 m (29.5 ft).

Testing Floor
 
Box Beam
 
Hydraulic Fluid Piping System
 

In the testing area, the top slab is perforated 0.914 m (3 ft) on center by 75 mm (2 15/16 in) holes (left). The placement of the holes accommodates the installation of modular loading equipment for a variety of tests with vertical and horizontal loading. The bottom slab and basement tunnel walls are equipped with attachments for the installation of 3-dimensional loading equipment. Located in the basement are a pair of pumps, with a combined capacity of 2.04 x 107 m3/s (5.4 x 103 gal/s), that deliver hydraulic-ram fluid under pressure of 21 MPa (3 ksi) through an extensive piping network to all points on the testing floor (below). The hydraulic power supply (HPS) is being upgraded to 4.53 x 107 m3/s (1.2 x 104 gal/s).

Servo-controlled hydraulic actuators are available to meet virtually any demand of structural testing in terms of both load and displacement capacities. A biaxial INSTRON 8500 Plus controller can be used to drive either one or two actuators in any of three control modes: position, load, or strain. This controller is also equipped with a PC for both the use of control and for acquiring data, using LabView software, from 224 channels. The number of channels may be extended up to 1056 .

 
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