The present paper describes the stress distribution around an anchorage rib which was constructed at an intermediate point along the length of a post-tensioned prestressed concrete member and a method of reinforcement for the concrete around the anchorage. The effects of several influencing factors on local tensile stress were investigated in detail by using the finite element method.
Based on the results obtained and the limitation of the variables studied here, the following conclusions were drawn.
(1) The distribution of bursting tensile stress (σ
y) in case of the rib-anchorage is similar to that of the normal anchorage without a rib which is used at one of the ends of a prestressed concrete member. Therefore, the informations on the stress σ
y and its resultant tensile force
P for the normal anchorage may be utilized to rib-anchorage.
(2) The direction of a principal tensile stress (σ
k) at the re-entrant corner of the rib-anchorage inclines by about 40° to the plane on which the prestressing force (
P1) is applied. This direction is little changed even though the angle of inclination of P
1 with respect to the axis of the member (θ=5°∼10°), the size of an anchor plate and the depth of the member (
H=17∼23cm) are changed.
(3) The resultant tensile force (
Zk) of σ
k is equal to about 15% of
P1, and it is little affected by the variables considered in this study.
In addition, it is pointed out that the corner zone of the rib can be designed by full prestressing.
抄録全体を表示