Investigation and improvement of strut-and-tie model for design of end anchorage zone in post-tensioned concrete structure

Abstract The strut-and-tie model (STM) is commonly used for the design of the end anchorage zone in post-tensioned concrete structures. In present work, the most accepted STMs in practice design for either centric or eccentric anchorage zone were inspected comprehensively based on experimental investigations and FEM simulations, to improve the models in accuracy, economy and efficiency. FEM was first employed to obtain the stress distribution in the anchorage zone, to reveal the influence of the anchor size and tension eccentricity on the compressive force, bursting force, spalling force and flexural tensile force. Based on FEM findings, the Morsch STM for the design of centric end anchorage zone was configured and modified by taking into account the counteractive effect of the spiral circle and reinforcement on the distribution of stress in the anchorage zone. The adjusted Morsch STM was employed for small eccentric end anchorage zone with the simplified equations from the FEM simulations. For the large eccentric end anchorage zone, a completely design procedure based on Schlaich model was offered by improving the determination method of the spalling force and bursting force in both values and locations. In above improvements on STMs, simplified equations were proposed for engineers to design the end anchorage zone more conveniently.

[1]  Daniel A. Kuchma,et al.  Automated Finite-Element-Based Validation of Structures Designed by the Strut-and-Tie Method , 2010 .

[2]  Jun Chen,et al.  A design approach for the interior anchorage zone of post-tensioned concrete structure , 2011 .

[3]  Walter Podolny,et al.  The Cause of Cracking in Post-Tensioned Concrete Box Girder Bridges and Retrofit Procedures , 1985 .

[4]  Olivier Burdet.  Analysis and Design of Anchorage Zones in Post-Tensioned Concrete Bridges , 1990 .

[5]  S. Shen,et al.  Ground Response to Multiple Parallel Microtunneling Operations in Cemented Silty Clay and Sand , 2016 .

[6]  Fritz Leonhardt,et al.  Prestressed concrete : design and construction , 1964 .

[7]  Shui-Long Shen,et al.  Assessment of internal forces for intermediate anchorage zone of post-tensioned concrete structure , 2014 .

[8]  Yi Min Xie,et al.  Generating optimal strut-and-tie models in prestressed concrete beams by performance-based optimization , 2001 .

[9]  M. Said,et al.  Analytical and experimental flexural behavior of concrete beams reinforced with glass fiber reinforced polymers bars , 2015 .

[10]  Junbok Lee,et al.  Effectiveness factor of strut-and-tie model for concrete deep beams reinforced with FRP rebars , 2014 .

[11]  Mete A. Sozen,et al.  DESIGN OF ANCHORAGE-ZONE REINFORCEMENT IN PRESTRESSED CONCRETE BEAMS , 1967 .

[12]  Ned H. Burns,et al.  Design of Prestressed Concrete Structures , 1963 .

[13]  S. Shen,et al.  Long-term settlement behaviour of metro tunnels in the soft deposits of Shanghai , 2014 .

[14]  Ernest Payson Goodrich,et al.  Concrete-steel Construction: , 2010 .

[15]  S. Shen,et al.  Analysis of shearing effect on tunnel induced by load transfer along longitudinal direction , 2008 .

[16]  Olivier Burdet,et al.  ANCHORAGE ZONE REINFORCEMENT FOR POST-TENSIONED CONCRETE GIRDERS , 1994 .

[17]  Jian Fei Chen,et al.  Interfacial stresses in soffit-plated reinforced concrete beams , 2004 .

[18]  Mete A. Sozen,et al.  PRACTICAL ANALYSIS OF THE ANCHORAGE ZONE PROBLEM IN PRESTRESSED BEAMS , 1965 .

[19]  Huai-Na Wu,et al.  Longitudinal structural modelling of shield tunnels considering shearing dislocation between segmental rings , 2015 .

[20]  J Schlaich,et al.  TOWARD A CONSISTENT DESIGN OF STRUCTURAL CONCRETE , 1987 .

[21]  Zhu Hehua,et al.  Model Experimental Study on Joints Stiff of Precast and Prestressed Concrete Lining in Shield Tunnels , 2009 .

[22]  Deric J. Oehlers.  Longitudinal splitting in the anchorage zones of post-tensioned members , 1997 .

[23]  Yi Min Xie,et al.  Topology Optimization of Strut-and-Tie Models in Reinforced Concrete Structures Using an Evolutionary Procedure , 2000 .

[24]  Huai-Na Wu,et al.  Evaluation of effect of basal geotextile reinforcement under embankment loading on soft marine deposits , 2015 .

[25]  Yang Sun,et al.  Application of strut-and-tie model for design of interior anchorage zone in post-tensioned concrete structure , 2010 .

[26]  K. T. Sundara Raja Iyengar,et al.  A three-dimensional stress distribution problem in the anchorage zone of a post-tensioned concrete beam , 1966 .