あと施工アンカーによる直線定着主筋を有するRC壁柱状部材の履歴復元力特性 [in Japanese] HYSTERETIC RESTORING FORCE CHARACTERISTICS OF RC WALL COLUMN SPECIMEN USING POST-INSTALLED ADHESIVE ANCHORS FOR MAIN BARS [in Japanese]
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<b>1. Introduction</b><br> This paper describes investigation about hysteretic restoring force characteristics of reinforced concrete wall column specimens. Static loading tests of three specimens were conducted. Nonlinear finite element analysis were conducted for three specimens. The objective in this paper is to investigate effect of bond behavior of post-installed adhesive anchors on restoring force characteristics.<br> <b>2. Outline of the Static Loading Tests</b><br> Three specimens were tested. One of them, WS485, was ordinal reinforced concrete specimen, while in the other specimens, post-installed adhesive anchors were used for main bar anchorages. The difference between the other two specimens was anchor length of main bars. One of them, the specimen named as WA485 had the same length as the RC specimen WS485. The other post-installed adhesive anchor specimen, named as WA265 had shorter length of anchorage than the other two specimens. As the test results, yielding of the main bars were observed for all specimens and three specimens had almost same capacities. Slip behaviors were observed in WA265 and WS485, and energy dissipation capacity of specimen WA265 was lower than those of the other specimens.<br> <b>3. Modeling for Nonlinear Finite Element Analysis</b><br> Three-dimensional nonlinear finite element analyses were conducted using “FINAL”. Concrete was modelled using eight-node hexahedral element and main bar was modelled using truss element. Four-node joint type elements were inserted between hexahedral elements and truss elements of main bars for the purpose of incorporating bond slip behavior. For the specimens WA485 and WA265, the perimeter length of post-installed adhesive anchor was calculated from the diameter of drill instead of main bar.<br> <b>4. Comparisons of Analytical and Experimental Results</b><br> Crack patterns were shown in Figure 5, and load-displacement relationships were compared in Figure 6. Horizontal cracks along the main bars in stub were observed in both experimental and analytical results. Slip behavior in load-displacement relationship for the specimen WA265 and WS485 obtained from the analyses were observed similar to the experimental results. Although the equivalent viscous damping ratios of analytical results for specimen WS485 and WA485 were slightly underestimated to the experimental results, analytical results for the specimen WA265 showed good accordance with experimental ones. Load and flexural, or shear, displacement relations were shown in Figure 11. Fig. 11 shows that the slip behavior was observed in flexural mode. Figure 12 shows the stress distribution of main bars for both analytical and experimental results. Although the analytical results in tension corresponded well to the experimental ones, analyses underestimated in compression.<br> <b>5. Conclusion</b><br> Restoring force characteristics of RC wall column specimens were investigated both experimentally and analytically. Three types of main bar anchorage were investigated. One was ordinal type, while the other two were post-installed adhesive anchors. Anchor length was varied in the latter two specimens. The specimen WA265, which had shorter length anchorage showed lower energy dissipation characteristics than the other two specimens and slip behavior was observed. Analytically, these behaviors were shown with good accordance with the experimental results. Stress distribution of main bars derived from analytical results corresponded well to the experimental ones only in tension.<br> <b>Acknowledgement</b><br> Static loading tests were conducted through the project: “study on confirmation methods of structural performances for RC members using post-installed adhesive anchors”, which was supported by the subsidies for the project servicing the architectural standard from the Ministry of Land, Infrastructure, Transport and Tourist.
- Journal of Structural and Construction Engineering (Transactions of AIJ)
Journal of Structural and Construction Engineering (Transactions of AIJ) (749), 1041-1050, 2018-07
Architectural Institute of Japan