CRANES + STRUCTURES / PROJECT EXPERIENCE

Batch-House Crane Arrangement

A Maintenance Crane Was Required Above An Operating Batch-House, But Structural Records Were Incomplete. The Proposed Orientation Restricted Useful Reach And The Supplied Crane Interface Did Not Match The Existing Supporting Steel.

WHAT HAD TO BE PROVED

The Revised Base And Existing Supporting Steel Could Carry The Reactions After The Crane Was Rotated For Useful Maintenance Reach.

Hand calculations remained the design basis. A local finite-element model covered the new base plate, gussets and the first length of supporting steel—not the whole building. Its purpose was to examine load introduction that code formulae represent coarsely: local plate bending, weld-toe hot spots and whether the existing web required a stiffener.

LOAD INTRODUCTION / REVISED CRANE BASE

LOCAL MODEL EXTENT

Column → plate → gussets → beam web and flanges → supporting connection and anchors

CHECK

PURPOSE

STATUS AFTER REVISION

Hand calculations

PURPOSE

DESIGN BASIS

Local shell model

Plate bending and load introduction

CHECKED

Weld detail review

Load path and weld-toe sensitivity

REVISED

Existing beam web

Need for local stiffening

CHECKED

Fabrication interface

Fit to verified existing steel

REVISED

WHAT THE ANALYSIS CHANGED

Crane Rotated. Plate Enlarged. Load Transfer Gusseted. Interface Redesigned To The Steel That Was Actually There.

TYPICAL JOBS Crane Will Not Reach The Job Chute Worn Out, Drawings Wrong Fan Not Making The Duty Existing Steel, No Reliable Drawings

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