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### Crane Runway Girder Design Example (ASD)

Example 14.1.1—Crane Runway Girder Design Example (ASD) Given: Use ASCE/SEI 7-16 to design an ASTM A992 W-shape runway girder for a CMAA Class B crane. Assume no reduction in allowable stress due to fatigue. The design parameters are: Type of control: cab-operated Crane capacity = 20 tons (40 kips) Bridge weight = 57.2 kips Combined trolley and hoist weight = 10.6 kips Maximum wheel load (...

### calculation Stress girder Overhead Crane

To calculate the stress in an overhead crane girder, you will need to consider the following factors: 1. Dead Load: This is the weight of the girder itself, including any attachments and accessories. The dead load is a constant and can be easily calculated based on the material weight and dimensions of the girder. 2. Live Load: This is the weight of the crane and the load it carries. The live lo...

### calculation joint plate girder Overhead Crane

Certainly! The calculation of joint plates for a girder typically involves determining the size and thickness of the plate required to transfer the stresses at the joint between the girder and another structural member, such as a column or beam. Here are the general steps for calculating joint plates for a girder: 1. Determine the load conditions and stresses at the joint. This includes the magn...

### Crane Terminology

ADJUSTABLE FREQUENCY DRIVE – A motor controller designed to convert fixed frequency AC power to available frequency power for AC motor speed control. The system is used in conjunction with a squirrel cage motor to control speed over a relatively wide, constant torque range, by maintaining a constant voltage / frequency ratio. This type of control “leashes” the in-rush current to deliver startup p...

### Bridge Structure Inspections

Item Description Points of Interest for Inspection 1 Trolley rail bolted splices. Loose and missing splice bolts, check for improper hardware.  Joint bar bolts have straight shanks to the head and are made per ASTM A449.  Nuts are per A563 grade B.   A325 bolts and nuts may also be used.  Check/tighten splice bolts every 3 months.  Fasteners should include a helical spring l...

### Eye Self Locking Hook

An eye self-locking hook is a type of hook used for lifting and rigging heavy loads. It is designed with a self-locking mechanism that helps to prevent accidental disconnection of the load. The hook has a latch or locking mechanism that must be manually opened to insert or remove the load, and then closes automatically to secure the load in place. The "eye" in the name refers to the shape of th...