Seismic performance and retrofit of precast concrete grouted sleeve connections

Abstract

All rights reserved. No part of this publication may be reproduced in any form or by any means, without the prior written permission of the Prestressed Concrete Institute. N ineteen seventy-nine was the 25-year Silver Jubilee of the founding of the Prestressed Concrete Institute. CONTENTS Part 6-Early History of Prestressed 163 Concrete in Colorado 'Ed Thwaits is now 85 years old and fives quietly in Denver, Colorado.

Cyclic shear tests on RC precast beam-to-column connections retrofitted with a three-hinged steel device

“…20 the envelope of 14 the shear test on the dowel connection (black solid curve) is showed up to the 20% strength 15 degradation, assumed as the attainment of the connection failure (see section 2). The comparison 16 demonstrates that the retrofitted connections (blue dash-dot and red dashed curves in Fig. 20) show 17 lower initial stiffness with respect to the dowel connection (black solid curve in Fig.…”

“…After the first 11 concrete crack, the dissipated energies in the dowel connection and in the retrofitted solutions were 12 quite similar, because of the increased deformability of the dowel connection due to the concrete 13 damage. The dissipated energy in the two retrofitted connections increased up to the end of the 14 shear tests; moreover, the deformation of the rubber hose around the horizontal dowel in the beam 15 led to larger relative displacements (lower stiffness of the beam-to-column connection) and 16 dissipation. This evidence resulted in larger values of the dissipated energy for test 2 than for the 17 test 1.…”

“…The two retrofitted connections and the retrofitting 15 systems have the same geometrical and mechanical features. 16 The same vertical and horizontal loads were applied in both tests according to the loading protocols 17 described in section 2. Since in retrofitted existing structures the gravity loads are applied to the 18 structure before the installation of the retrofitting system, in the performed tests the vertical load 19 was applied before tightening the connection device by means of nuts and washers.…”

An Experimental Study of Welded Bar Sleeve Wall Panel Connection under Tensile, Shear, and Flexural Loads

“…There could be other forces acting on the connection. Hence, experimental studies were conducted on the precast concrete frames with the connections of beam-to-beam (Aldin Hosseini et al 2015;Sayadi et al 2014), column-to-beam (Ameli et al 2015;Kim 2000), column-to-column (Tullini and Minghini 2016), wall-to-wall (Soudki et al 1995;Zhu and Guo 2016) and column-to-foundation (Haber et al 2014;Belleri and Riva 2012) to determine the structural performance.…”

Experimental study on Bond slip relationship of Steel sleeve

“…Chen, G. And Baker, G studied the influence of bond slip on the crack spacing of concrete by simulation in 2003,and believed that the influence of bond slip on the crack spacing is very obvious [9] . Belleri Andreaet al [10] put the grout sleeve for column and foundation connections in earthquake zones, and found that the grouting sleeve connection is similar to the traditional connection, which can ensure the ductility and energy dissipation capacity of the connection area.…”