In order to avoid the possibility of further disputes, the British, Free State, and Northern Ireland governments agreed to suppress the overall report, and on 3 December 1925, instead of any changes being made, the existing border was confirmed by W. This was leaked to The Morning Post in 1925, causing protests from both unionists and nationalists. However, the Commission recommended relatively small transfers, and in both directions. Most Irish nationalists hoped for a considerable transfer of land to the Free State, on the basis that most border areas had nationalist majorities. The provisional border in 1922 was that which the Government of Ireland Act 1920 made between Northern Ireland and Southern Ireland. When the Northern government refused to cooperate, the British government assigned a Belfast newspaper editor to represent Northern Irish interests. The governments of the United Kingdom, of the Irish Free State and of Northern Ireland were to nominate one member each to the commission. The 1921 Anglo-Irish Treaty, which ended the Irish War of Independence, provided for such a commission if Northern Ireland chose to secede from the Irish Free State (Article 12), an event that occurred as expected two days after the Free State's inception on 6 December 1922, resulting in the Partition of Ireland. The Irish Boundary Commission ( Irish: Coimisiún na Teorann) met in 1924–25 to decide on the precise delineation of the border between the Irish Free State and Northern Ireland. The ultimate drift ratios of all specimens are greater than 1/70, which satisfy the design requirement of deformation capacity of reinforced concrete shear walls under rare earthquake level.A map showing the border between the Irish Free State and Northern Ireland, which was fixed in 1921 and confirmed in 1925 The drift ratio at peak load is about 1/80 and 1/140 for the specimens with and without increment of the overlapping reinforcement area, respectively. The peak load of the specimen with 33% increment of the overlapping reinforcement area increases about 12%. The moment resisting capacity of the specimens is about 1.06~1.21 times of the predicted value. The hysteretic curves of all specimens are quite plump but the curves of specimens with increment of the overlapping reinforcement area are plumper, the stiffness degradation is decreased and the energy consumption capacity is improved. The local deflection concentration and local damage near the bottom have been controlled significantly. Increasing the overlapping reinforcement can effectively shift the wall damage zone from the bottom horizontal joint to the top zone of the overlapping bars in the boundary elements. Two specimens with increment of the overlapping reinforcement area have more cracks and distribute more symmetrically and uniformly. The test results indicate that all specimens fail in flexural failure mode. The influences of axial force ratio, boundary element form and increment ratio of overlapping reinforcement area (0%, 25% and 33%) on specimens were analyzed. Three specimens included one specimen with confined boundary elements under axial force ratio of 0.2 and two specimens with construction boundary elements under axial force ratio of 0.1.
#Superimposed boundary full#
To research the seismic performance of this wall, experimental study on seismic behavior of three DSWPBE full scale specimens with height to depth ratio of 2.0 under lower axial force ratio was conducted. Regarding its local deflection concentration near the bottom seam, a double-superimposed shear wall with appropriate increment ratio on overlapping reinforcement area was designed. Double-superimposed shear wall with prefabricated boundary elements (DSWPBE) is an assembled shear wall with high precast ratio.
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