Title:
Stress Distribution and Cracking Behavior at Anchorage Zones in Prestressed Concrete Members
Author(s):
Byung Hwan Oh, Dong Hwan Lim, and Sung Soo Park
Publication:
Structural Journal
Volume:
94
Issue:
5
Appears on pages(s):
549-557
Keywords:
anchorage zone behavior; stresses; strains; failure; local stress
distribution;modes of failure; spalling;
DOI:
10.14359/504
Date:
9/1/1997
Abstract:
Recently, several prestressed concrete structures have experienced severe cracking along the tendon path when prestress force has been transferred in the anchorage zone. The purpose of the present study is to explore characteristics of the local stress distribution and to study the failure mechanism on the anchorage zones of the precast prestressed concrete structures. To accomplish these objectives, a comprehensive experimental and analytical study has been conducted. Major variables include section geometry, tendon profile and types of local reinforcements. From this study, it is found that the failure of the anchorage zones is initiated by the cracks along the tendon path and eventually sudden explosive failure with complete destruction on the anchorage zones. Section geometry such as tendon inclination, tendon eccentricity and concrete cover thickness affect the cracking and ultimate loads. The cracking and ultimate load capacities for spirally reinforced anchorage zones are found to be larger than those for orthogonal reinforced anchorage zones. A new concept of failure mechanism on the anchorage zone is suggested, and the proposed concept describes well the failure process of prestressed concrete members.