長締め高力ボルト引張接合によるコンクリート充てん角形鋼管柱・梁接合部に関する研究 : その1 ボルト軸力導入時の挙動

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The objective of this paper is to investigate the elemental behavior of concrete filled RHS col-umn subjected to prestresses caused by tightening long high strength bolts (HT bolts). In this study, the encased concrete is partially placed in the column to H beam connections to prevent local failure of the columns. The connections which are devised to develop an easier fabrication technique of moment con-nections by HT bolts as shown in Fig. 1. The stress distribution of concrete and the load carrying share of RHS column walls as the pres-tress is introduced by HT bolts The objective of this paper is to investigate the elemental behavior of concrete filled RHS column subjected to prestresses caused by tightening long high strength bolts (HT bolts). In this study, the encased concrete is partially placed in the column to H beam connections to prevent local failure of the columns. The connections which are devised to develop an easier fabrication technique of moment connections by HT bolts as shown in Fig. 1. The stress distribution of concrete and the load carrying share of RHS column walls as the pres-tress is introduced by HT bolts are examined, experimentally and analytically. The summary is as follows: 1. As the results of the tests, it is shown that the length of encased concrete is sufficient when the distance from the end of concrete core to the outer surface of H beam flange is equal to the column depth (D), and that the relaxation of tensile force in the HT bolts caused by concrete creep is about 15 % in 22 weeks, which corresponds to the results concerned with the HT bolts coated with zinc for usual steel joints. 2. The stress distributions of encased concrete can be roughly estimated by the FEM analysis and the analysis of beams on elastic foundation. 3. The effective width of column web (_sB_e) and the effective cross-sectional area of encased concrete (A^*_e) when the prestress is introduced are obtained from the analytical study. The _sB_e and A^*_e can be used for a simple prismatic model of the connection.
社団法人日本建築学会の論文
1990-08-30

長締め高力ボルト引張接合によるコンクリート充てん角形鋼管柱・梁接合部に関する研究 : その1 ボルト軸力導入時の挙動

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