Expansion Joints in Buildings





INTRODUCTION

A. PURPOSE OF REPORT

The purpose of this report is to provide federal agencies with practical procedures for evaluating the need

for through-building expansion joints in structural framing systems and with guidelines for designing expansion

joints for those systems when they are required.



B. SCOPE

The term “expansion joint” as used throughout this report refers to the isolation joints provided within a

building to permit the separate segments of the structural frame to expand and contract in response to

temperature changes without adversely affecting the building's structural integrity or serviceability.

This report is limited to the investigation of expansion joints that permit movement in the horizontal

direction only. All types of building and all climatic conditions experienced in the United States are considered.

Problems such as those associated with vertical movement of the structural frame, dimensional changes of

cladding, relative motion of cladding to frame, shrinkage of concrete, manufacturing errors in the length of

members, and differential settlement of foundations are not considered.





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