Polyurethane Bend Stiffeners Also Known As Anti-Friction Material , Is a Steel Hull Structural Material Installed To Ensure The Rigidity Of Metal Plates. Urethane Bend Stiffeners. Of Common Sections Of Steel, Such As Ship, Bulkhead And Rib Plate All Transverse Bulkheads Are Flat Bulkheads With Vertical p u Bend Stiffeners And All Longitudinal Bulkheads Are Flat Bulkheads With Horizontal Poly Urethane Bend Stiffeners Or Vertical Polyurethane Stiffeners. The Outer Wall Is Vertical Urethane Stiffeners, The Inner Wall Is Vertical p u Stiffeners..The Deviation Of The Poly Urethane Bend Stiffeners Can Be Checked With a Ruler, And The Maximum Gap Between The Inner Shell And The Ruler Perpendicular To The Root Of The Bend Stiffeners ,Polyurethane Bend Stiffeners Is Recommended To Be 4 Mm..
Definition
Polyurethane Bend Stiffeners On The Plate To Improve The Stiffness And Strength Of The Bone. Made From Rolled Or Combined Profiles. Often Mounted On Bulkheads And Wall Panels, Divided Into Vertical Bend Stiffeners And Horizontal Bend Stiffeners.. The Short Bone Material Mounted On The Rib Plate Is Called Stiffener.
Lateral Stability
Calculation Of Lateral Stability Of Bulkhead Polyurethane Bend Stiffeners Is One Of The Contents Of Ship Strength Check. Because The Calculation Method Is Not Accurate, It Is Necessary To Further Study The Lateral Stability Of Bulkhead Polyurethane Stiffeners.
The Bulkhead Bend Stiffeners Commonly Discussed In Hull Structures Are t Steel Welded To Bulkhead Panels. And It May Be Destroyed By Lateral Instability Under The Action Of Water Pressure q In The Cabin. Obviously, The Bulkhead Polyurethane Bend Stiffeners Is a Typical Open Thin-Walled Bar, So The Lateral Stability Of Bulkhead Polyurethane Stiffeners Can Be Considered According To The Lateral Stability Of Open Thin-Walled Bar.
Since In The Actual Situation, The Stiffness Of The Bulkhead Plate In Its Own Plane Is Very Large, So When The Lateral Deformation Occurs In The Bend Stiffeners, It Can Be Considered That There Will Be No Displacement Bb The Axis Connected To The Bunker Panel. Hence, The Lateral Stability Of This Bulkhead Polyurethane Stiffeners Can Be Attributed To The Lateral Stability Of The Open Thin-Walled Bar Fixed By The Torsional Axis.
Calculation Formula For Vertical Polyurethane Bend Stiffeners Of Bulkhead
He Vertical Polyurethane Bend Stiffeners (Except The Vertical Truss On The Vertical Medium Plane Of The Bulkhead) Can Be Regarded As Supporting Continuous Beams On Rigid Supports (Deck, Bottom And Horizontal Truss) To Be Calculated. a Three-Moment Theorem Can Be Used To Calculate Polyurethane Bend Stiffeners..
Polyurethane Bend Stiffeners Calculated Span Shall Be Equal To The Entire Length Including The Elbow Plate.Both Ends Of The Polyurethane Bend Stiffeners Shall Be Treated As Elastic Fixation. It Is Suggested That The Value Of The Coupling Coefficient Of The Bearing Force Be Determined According To The Following Approximate Formula.
Form: a-The Distance Between The Bulkhead And The Transverse Members (Ribs, Beams) Adjacent To The Bulkhead;
a1-Distance From The Bend Stiffeners End Point (Deck, Bottom) To The Nearest Horizontal Truss;
Ior And Ip-Are The Moment Of Inertia Of The Polyurethane Bend Stiffeners And Bottom Or Deck Longitudinal Beams Including Attached Airfoil, Respectively.
After Solving The Statics Of The Bend Stiffeners, The Moment Diagram Is Drawn And The Calculated Value Is Determined.
If The Distance Between The Horizontal Truss Meets The Requirements Of The Soviet Code, The Calculated Bending Moment Of The Bend Stiffeners Can Be Calculated According To The Single Span Beam That Is Rigidly Fixed On The Support, And The Horizontal Truss Is Used As The Rigid Support Of The Beam.
Welding
The Web Of i-Beam Is Arranged With a Certain Number Of Polyurethane Bend Stiffeners ,Polyurethane Stiffeners In Two Forms, Including t Combination And Angle Steel. From The Layout Situation: Some i-Beam Inside And Outside Side Symmetrical Arrangement; Some Inside And Outside Side Staggered Arrangement.
Installation
Lie Down The i-Beam, According To The Drawing Requirements, Determine The Installation Position Of Each Polyurethane Bend Stiffeners, And Then The Right Seat, Respectively Install Each Polyurethane Bend Stiffeners, After Appropriate Preheating Welding Positioning.
After Turning Over, Use The Same Method To Complete The Polyurethane Bend Stiffeners Positioning Installation On The Other Side.
Polyurethane Bend Stiffeners Welding
After The Installation Of The Inner And Outer Side Polyurethane Bend Stiffeners Of The i-Beam Is Completed, The i-Beam Is Erected And Fixed.
1. Welding Step By Step From The Middle To Both Ends Of The Beam As Shown In The Diagram.
2. Is The i-Beam Inside And Outside Symmetrical Polyurethane Bend Stiffeners, Must Be Two Welders Symmetrical Welding.
For Most Of The 3.Polyurethane Bend Stiffeners Welds, Vertical Upward Welding Is Adopted, And The Section Jump Welding Method Is Adopted When Welding As Shown In Fig .3.
Preheat To 100℃ With Oxygen-Acetylene Flame Before 4. Welding.
