DYMAT® Structural Bearings

Sliding Bearings

Design

Type 1 Design

Total dead plus live load on bottom pad maximum of 1000 psi with maximum dead load of 750 psi

Maximum deflection at 2000 psi is approximately 10% of thickness of bottom pad. Design for 2% rotation in l direction

Design coefficient of friction 
A.  750 to 1000 psi of .04
B.  500 to 700 psi of .05

To design top plate overlap of bottom pad:  bottom pads less than 40 sq in / minimum edge is 1/2 in;
bottom pads more than 40 sq in / minimum edge is 3/4 in

Complete bearing assembly capable of test to 5000 psi for 5 minutes with no visible damage

Recommended operating temperature range is -40ºF to 180ºF

Neoprene material meets AASHTO specification. The bearings can also be manufactured in natural rubber to AASHTO specification.

 

Type 2 Design

Total dead plus live load on bottom pad maximum of 2000 psi with maximum dead load of 1700 psi

Maximum deflection at 2000 psi is approximately 10% of thickness of bottom pad. Design for 2% rotation in l direction

Design coefficient of friction
A.  1000 to 1500 psi of .04
B.   1500 to 2000 psi of .03

Complete bearing assembly capable of test to 5000 psi for 5 minutes with no visible damage

Recommended operating temperature range is -70ºF to 200ºF

Special polyurethane meets DYMAT™ material specification, which is available on request.

All other details and installation same as Type 1 bearings.

Type 1​

​Top Plate​

ASTM A36 or G40.21 steel plate 1/2 to 1 in thick with a 304 stainless steel highly polished bright annealed lower surface. The stainless steel sheet is continuously welded to the steel plate

​Bottom Pad

Consists of 60 Durometer Neoprene or natural rubber materials to meet the AASHTO specifications. One or two 1/8 in shims are molded into the pad with a minimum of 1/8 in cover of Neoprene over the edges of the steel shims. 1/32 in thick virgin Teflon® sheet is molded onto the top surface of the pad

ADDITIONAL CARBON FABRICS

DEWC

Carbon fabric for 0/90 degree pplication

DCBC

Carbon +/- 45 degree fabric

DCV

Carbon Veil fabric

Type 2​

Top Plate

ASTM A36 or G40.21 steel plate 1/2 to 1 in thick with a 304 stainless steel highly polished bright annealed lower surface. The stainless steel sheet is continuously welded to the steel plate

Bottom Pad

High quality polyurethane developed specially for application. The Teflon® sheet is bonded to 1/8 in thick fiberglass or steel sheet which is molded into pad. The Teflon® sheet is 1/32 in thick virgin Teflon®

Top Plate

l = plan dimension in direction of rotation w = plan dimension t = thickness excluding stainless steel

Bottom Pad

a = plan dimension in direction of rotation b = plan dimension c = thickness including Teflon®

Features

Installation

Pre-Cast Beam arrangement

Cast in place concrete bearing

Typical connection

Pre-cast concrete arrangement

Pipeline arrangement

Tank arrangement