A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Rational Shear Provisions for AASHTO LRFD Specifications: Technical Report
Prestressed concrete I-beams are used extensively as the primary superstructure components in Texas highway bridges. This research intends to solve one of the most troublesome problems in prestressed concrete, namely shear. The problem arises from the lack of a rational model to predict the behavior of prestressed concrete structures under shear action and the various modes of shear failures. Because of this deficiency, all the guidelines for shear design, such as ACI Codes and AASHTO Specifications, are empirical and have severe limitations. The research work was divided into two phases: Phase One consisted of developing the constitutive laws for prestressed concrete membrane elements and developing an analytical model for predicting the shear behavior of such elements. Crack simulation tests were first performed on rectangular prestressed beams to find the same cracking pattern of post-tensioned concrete with conduits as that in pre-tensioned concrete without conduits. Ten prestressed concrete panels (two series of five panels each) were tested. The first series of five panels was tested under sequential loading. The results of these tests were used to establish the constitutive relationships of materials (concrete and prestressing tendons). The second series of panels was tested under pure shear (a special case of proportional loading) to study the shear behavior of prestressed concrete membrane elements. Finally the Softened Membrane Model for Prestressed Concrete (SMM-PC) was developed to predict the response of prestressed concrete membrane elements under shear loading. Phase Two of the research dealt with testing of full-scale prestressed concreted I-beams and developing a new simplified equation for the shear design of prestressed concrete girders.
Rational Shear Provisions for AASHTO LRFD Specifications: Technical Report
Prestressed concrete I-beams are used extensively as the primary superstructure components in Texas highway bridges. This research intends to solve one of the most troublesome problems in prestressed concrete, namely shear. The problem arises from the lack of a rational model to predict the behavior of prestressed concrete structures under shear action and the various modes of shear failures. Because of this deficiency, all the guidelines for shear design, such as ACI Codes and AASHTO Specifications, are empirical and have severe limitations. The research work was divided into two phases: Phase One consisted of developing the constitutive laws for prestressed concrete membrane elements and developing an analytical model for predicting the shear behavior of such elements. Crack simulation tests were first performed on rectangular prestressed beams to find the same cracking pattern of post-tensioned concrete with conduits as that in pre-tensioned concrete without conduits. Ten prestressed concrete panels (two series of five panels each) were tested. The first series of five panels was tested under sequential loading. The results of these tests were used to establish the constitutive relationships of materials (concrete and prestressing tendons). The second series of panels was tested under pure shear (a special case of proportional loading) to study the shear behavior of prestressed concrete membrane elements. Finally the Softened Membrane Model for Prestressed Concrete (SMM-PC) was developed to predict the response of prestressed concrete membrane elements under shear loading. Phase Two of the research dealt with testing of full-scale prestressed concreted I-beams and developing a new simplified equation for the shear design of prestressed concrete girders.
Rational Shear Provisions for AASHTO LRFD Specifications: Technical Report
A. Laskar (author) / J. Wang (author) / T. T. C. Hsu (author) / Y. L. Mo (author)
2007
216 pages
Report
No indication
English
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