3.    Laboratory Equipment  29

3.1.     Shake Tables  29

3.1.1.1.  Physical data of Shake Tables  30

3.1.1.2.  Tables Extensions  31

3.1.1.3.  Performance Data   32

3.1.1.4.  Drawings  33

3.1.2.     Shake table O – 6 dof  36

3.1.2.1.  Physical data   37

3.1.2.2.  Capacity data   37

3.1.2.3.  Drawings  37

3.1.3.     Single degree-of-freedom shake table   39

3.1.3.1.  Physical data   39

3.1.3.2.  Capacity data   39

3.1.3.3.  Drawings  40

3.2.     Reaction walls   40

3.2.1.     Reaction Wall –Test Area 2   40

3.2.1.1.  Physical data   40

3.2.1.2.  Capacity data   41

3.2.1.3.  Drawings  43

3.3.     Strong Floors  45

3.3.1.     Strong Floor O – Test Area 1   45

3.3.1.1.  Physical data   45

3.3.1.2.  Capacity data   45

3.3.1.3.  Drawings  45

3.3.1.4.  Simulation Drawings  45

3.3.2.     Strong Floor – Test Area 2   45

3.3.2.1.  Physical data   45

3.3.2.2.  Capacity data   46

3.3.2.3.  Drawings  47

3.4.     Hydraulic Power Supply Systems  47

3.4.1.     Test Area 1   47

3.4.2.     Test Area 2   48

3.4.2.1.  Layout  48

3.4.2.2.  Pumps  49

3.4.2.3.  Service manifolds (ports)  52

3.4.2.4.  Oil Filtration and Cleanliness  53

3.5.     Loading Systems  53

3.5.1.     Hydraulic actuators  53

3.5.1.1.  Hydraulic cylinders  58

3.5.1.2.  Servo-valves  58

3.5.1.3.  Servo-Controllers  59

3.5.1.4.  Hydraulic Service Manifolds  60

3.5.1.5.  Integration options – actuators, controllers, manifolds  61

3.5.2.     Testing Machines  61

3.5.2.1.  MTS Universal Tension Machine - 150 kip (667kN)  61

3.5.2.2.  MTS Axial-Torsion Machine   62

3.5.2.3.  Generic Large Bearing Testing Machine   62

3.5.2.4.  Generic Small Bearing Testing Machine   63

3.5.2.5.  Tinius-Olsen Universal testing Machine–300 kips (1350kN)  63

3.6.     Other Testing Systems  64

3.6.1.     Geotechnical Laminar Box  64

3.6.1.1.  Geometry   64

3.6.1.2.  Features  66

3.7.     Instrumentation   68

3.7.1.     Sensors  68

3.7.1.1.  Motion   68

3.7.1.1.1.  Displacement  68

3.7.1.1.2.  Acceleration   69

3.7.1.1.3.  Rotation   70

3.7.1.2.  Loading   71

3.7.1.3.  Strain   74

3.7.1.4.  Video   75

3.7.1.5.  Images – Still 76

3.7.2.     Conditioners  77

3.7.3.     Electronic Instruments  78

3.7.3.1.  Oscilloscopes  78

3.7.3.2.  Digital Multimeters and Voltage Standards  78

3.7.4.     Instrumentation frames  79

3.7.5.     Instrumentation Databases  80

3.7.5.1.  Instrumentation calibration   80

3.7.5.1.1.  Lab procedures  80

3.7.5.1.2.  Calibration examples and databases  80

3.8.     Data Acquisition Systems  80

3.8.1.     Pacific Instruments  80

3.8.2.     Optim MegaDac   80

3.8.3.     Krypton K600 Portable CMM System    81

3.8.4.     Dell Workstations – Portable DAQ   83

3.8.5.     Dell PC & Data Translation 12 bit Desktop System    84

3.9.     Networks  84

3.9.1.     Description   84

3.9.2.     Schematics  85

3.9.2.1.  Wired   85

3.9.2.2.  Wireless  85

3.9.3.     Servers  86

3.9.3.1.  NEESpop   87

3.9.3.2.  NEES TPM    87

3.9.3.3.  Webserver & Domain Servers  87

3.9.3.4.  Email Server  87

3.9.4.     Mass Storage   88

3.9.4.1.     Data Archival and Organization    88

3.9.5.     Telepresence   89

3.9.6.     Multipurpose Workstations  90

3.9.7.     Computational Workstations  90

 

3.     Laboratory Equipment

3.1.  Shake Tables

Shake table A and B – 6 DOF

Key elements of the SEESL are the two movable, six degrees-of-freedom, shake tables, which can be rapidly repositioned from directly adjacent to one another to positions up to 100 feet apart. Together, these tables can host specimens of up to 100 metric tons and as long as 120 feet, and subject them to fully in-phase or totally uncorrelated dynamic excitations.

Figure 3.1‑1: Shake Table A with Instrumentation Frame and specimen (w/o table extension)

Figure 3.1‑2: Shake Table B (w/o table extension)

 

3.1.1.1.        Physical data of Shake Tables

 

Each shake table has plan dimensions of 3.6 x 3.6 meter and is made of a welded steel construction with a weight of approximately 8 tons. Each table has a painted top surface.

A Parking Frame System consisting of a welded steel frame with electric actuators raises each table for repositioning within the length of the trench. The carrier capable of raising the table with the (4) horizontal actuators, (2) actuator buttresses, and (4) vertical actuators is attached. A steel beam is used for securing the horizontal actuator buttresses to the table during movement. The carrier rides on polyurethane wheels for ease of positioning and tracks along a center rail embedded in the trench floor being moved with a winch system.

Each shake table is driven by the following hydraulic actuators:

1. Longitudinal (X and Y-axis) hydraulic actuators (quantity = 2 each axis)

MTS Model 244.4 Hydraulic Actuator with a dynamic force rating of 21 metric ton and a dynamic stroke of 300 mm (±150 mm). The actuator assembly includes the following:

a. Hollow single piece rod

b. Model 256.25S servovalve rated at 1000lpm

c. LVDT type stroke transducers

d. Swivel heads and bases

e. Close-coupled pressure and return accumulators

f. Differential pressure cells.

2. Vertical (Z-axis) hydraulic actuator (quantity =4)

MTS Model 206.S Hydraulic Actuator with a dynamic force rating of 25 metric ton and a dynamic stroke of 150 mm (±75 mm). The actuator assembly includes the following:

            a. Hollow single piece rod

b. Model 256.18s servovalve rated at 650lpm

c. LVDT type stroke transducers

d. Swivel heads and bases

e. Close-coupled pressure and return accumulators

f. Differential pressure cells

g. Integral static support with 20 ton capacity (total static support capacity is 20 ton x 4 = 80 ton) will all necessary nitrogen supply and control system.

The Hydraulic Power Supply (HPS) subsystem for both shake tables consists of four MTS Model 506.92 pumps rated at 185gpm (700lpm) at 3,000psi (207 bar) each.

3.1.1.2.        Tables Extensions

There are the two 7 x 7 meter shake table extension platforms available for each of the shake tables. The Platforms are of welded steel construction with a weight of approximately 9.8 tons. The extensions have painted top surface.

 

Figure 3.1.1.2‑1: View of both shake tables with extension platforms in place

 

Figure 3.1.1.2‑2: Shake Table B with extension platform

3.1.1.3.        Performance Data

The two six degrees-of-freedom shake tables are designed for the nominal performance shown in Table 1. These performance data are based continuous uniaxial sinusoidal motion with 20-ton rigid specimen. System performance levels will be reduced with payloads larger than nominal.

 

Table 1: Performance data of six degrees-of-freedom shake tables.

3.1.1.4.          Drawings

Figures 1 to 5 present construction drawings for the six degrees-of-freedom shake tables. Figure 1 presents general plan view of the laboratory floor including the two shake tables in the trench next to a reaction wall. Figure 2, 3 and 4 shows top, bottom, and side views of one of the shake tables, respectively. Figure 5 shows details of the mounting bolts used to anchor a test specimen on the shake tables.

Figure 3.1.1.4‑1: General plan view of laboratory floor

Figure 3.1.1.4‑2: Top view of six degrees-of-freedom shake tables

 

Figure 3.1.1.4‑3: Bottom view of six degrees-of-freedom shake tables

Figure 3.1.1.4‑4: Side view of six degrees-of-freedom shake tables

Figure 3.1.1.4‑5: Mounting bolts details of six degrees-of-freedom shake tables

 

Figure 3.1.1.4‑6: Plan view of table extension

 

Figure 3.1.1.4‑7: Plan view of table extension, Detail 1

3.1.2.   Shake table O – 6 dof

Located in the original SEESL, the 3.66 by 3.66 m shake table has six controlled degrees of freedom (excluding the transverse translational movement). The longitudinal (horizontal), vertical and roll degrees of freedom are programmable with feedback control to simultaneously control displacement, velocity, and acceleration.

 

3.1.2.1.        Physical data

 The five degree-of-freedom shake table has payload capacity of 50 tons and a useful frequency range of 0 to 50 Hz. The table is normally furnished with a reinforced concrete testing platform of 6.1 m by 3.66 m plan dimensions that extends the useful testing area beyond the table's dimensions but limits the payload to 42.5 tons. The testing platform has holes on a one foot square grid for attaching test specimens.

3.1.2.2.        Capacity data

The five degrees-of-freedom shake table is designed for the nominal performance shown in Table 2. These performance data are based continuous uniaxial sinusoidal motion with 20-ton rigid specimen. System performance levels will be reduced with payloads larger than nominal.

 

Table 2 : Performance data of five degrees-of-freedom shake tables

3.1.2.3.        Drawings

Figure 3.1.2.3‑1 represents a perspective view of the five degrees-of-freedom shake table and foundation Figure 3.1.2.3‑2 presents a top view of the testing platform of the five degrees-of-freedom shake table. Figure 3.1.2.3‑3 presents a photograph of the five degrees-of-freedom shake table with a test specimen installed on it.

 

Figure 3.1.2.3‑1: Five degrees-of-freedom shake table and foundation

Figure 3.1.2.3‑2: Top view of testing platform of five degrees-of-freedom shake table

 

 

Figure 3.1.2.3‑3: Photograph of five degrees-of-freedom shake table with specimen

3.1.3.   Single degree-of-freedom shake table

The SEESL also hosts a smaller (0.91m x 1.52m) single degree-of-freedom (horizontal) shake table that has a payload capacity of at least 3 tons. The specimen height for the single degree-of-freedom shake table is restricted by uplift conditions since the table rides on slide bearings. The single degree-of-freedom shake table is suitable for use with an available three-story, 3 tons steel model structure.

3.1.3.1.        Physical data

The single degree-of-freedom shake table is driven by a 25kN actuator equipped with two 15gpm (56.78lpm) servovalves.

3.1.3.2.        Capacity data

The single degree-of-freedom shake table is designed for the nominal performance shown in Table 3. These performance data are based continuous uniaxial sinusoidal motion with a 3 ton rigid specimen. System performance levels will be reduced with payloads larger than nominal.

 

Table 3: Performance data of single degree-of-freedom shake tables

 

3.1.3.3.        Drawings

Figure 3.1.3.3‑1: Photograph of single degree-of-freedom shake table with dedicated 3-ton specimen

3.2. Reaction walls

3.2.1.   Reaction Wall –Test Area 2

Reaction Walls and Strong Floors allow 2 for testing of structual components such as steel trusses and concrete slabs.

3.2.1.1.        Physical data

Reaction Wall next to Strong Floor:

·         Length: 41'-0''

·         Height: 30'-0'’

·         Thickness: 2'-0''

 

Reaction Wall next to Shake Table Trench:

·         Length: 23'-0''

·         Height: 30'-0''

·         Thickness: 2'-0''

 

3.2.1.2.        Capacity data

 

Table 4: Strong Wall Capacity Data