Studies on the static behaviors of unbonded prestressed steel reinforced low-strength concrete rectangular frame beams

Xiong, Xu; Yao, Gangfeng

doi:10.1016/j.engstruct.2018.02.007

Cited by 10 publications

(5 citation statements)

References 30 publications

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“…Unbonded prestressed concrete structures are a very efficient loadcarrying system, especially with the use of greased low-cost tendons protected by plastic sheathing. These elements have been used extensively in North America for over 50 years [3] and have become popular in the construction of medium rise buildings in Brazil in the last decades [4] .Prestressed steel-reinforced concrete has better service performance and applies to long span and heavy-load structures [1] .Since its inception in the early 1960s, prestressing has gone through dramatic changes in application, technology, and development.The use of the technique is especially advantageous for the new construction of structures as well as the strengthening and rehabilitation of existing ones [2] .…”

Section: Introductionmentioning

confidence: 99%

Research on Ultimate Stress Increment of Unbonded Prestressed Steel Bars Based on Reliability

Zhao,

Yang

2024

Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24–26, 2023

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Unbonded tendons have been widely used in practical engineering worldwide, and scholars from various countries have conducted extensive research on the ultimate stress increment of unbonded tendons. However, the current calculation methods usually calculate the ultimate stress increment of unbonded prestressed tendons which is smaller than the actual increment, and most of them tend to be unsafe. Therefore, this article is based on the ultimate state equation of the normal section bearing capacity of unbonded prestressed concrete beams, sorting out the statistical parameters and distribution types of each random variable in the ultimate state equation, and using the first order second moment method to solve the structural reliability. Based on the target reliability index, the main factors and calculation formulas that affect the ultimate stress increment of unbonded reinforcement were analyzed, and a correction coefficient was introduced to consider the impact of reliability on the ultimate stress increment. By calculating the uncertainty coefficients of resistance calculation modes corresponding to different correction coefficients, the value of the correction coefficient was determined, and a reliability based calculation formula was established.

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Section: Introductionmentioning

confidence: 99%

Research on Ultimate Stress Increment of Unbonded Prestressed Steel Bars Based on Reliability

Zhao,

Yang

2024

Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24–26, 2023

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“…In addition, some scholars [23][24][25][26][27][28][29] analyzed the failure mode, crack development, and stiffness change of PSRC members and explored the deformation capacity of PSRC beams based on the stiffness change of the section. Based on the study of the deformation capacity of PSRC beams, scholars from various countries [30][31][32][33] studied the seismic performance of PSRC frames and analyzed the formation position and rotation ability of plastic hinges in PSRC frames. As prestressed technology improves crack resistance, it also affects the plastic deformation ability of the structure; therefore, to better apply the PSRC structure to practical engineering, many scholars [34][35][36][37][38][39] have studied the displacement ductility and plastic deformation ability of PSRC beams.…”

Section: Introductionmentioning

confidence: 99%

Plastic Properties of Prestressed High-Strength Steel Reinforced Concrete Continuous Beams

Wang,

Yang

2024

Applied Sciences

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In this paper, the plastic properties of prestressed high-strength steel reinforced concrete (PHSSRC) beams are studied, by performing static load tests on eight built-in Q460 and Q690 prestressed high-strength steel reinforced concrete continuous beams and one built-in Q355 prestressed steel reinforced concrete (PSRC) continuous beam. The design parameters of the specimens were the steel strength grade, the steel ratio, the comprehensive reinforcement ratio, and the stirrup ratio. The failure mode, load–deflection curve, internal force redistribution ability, curvature ductility, plastic hinge performance, and moment modification coefficient of continuous beams under the influence of various parameters were analyzed to measure the plastic performance of the continuous beams. These results show that after the plastic hinge is formed in the middle support and mid-span of the prestressed high-strength steel reinforced concrete continuous beam, the test beam eventually becomes a rotating mechanism and is destroyed with increasing load. The built-in high-strength steel can significantly improve the bearing capacity of the specimen, and the maximum increase in the bearing capacity is 37.3%. The specimen still has a high bearing capacity after reaching the ultimate bearing capacity. With a decrease in the steel ratio, the degree of internal force redistribution is deepened, the curvature ductility is improved, and the plastic performance is enhanced. Increasing the comprehensive reinforcement ratio and the stirrup ratio can improve the plastic performance of the specimen. The calculation formula of the equivalent plastic hinge zone length is proposed. The calculation formula of the moment modification coefficient, with the relative plastic rotation angle and relative compression zone height as independent variables, is established. When the relative plastic rotation angle is not greater than 0.829 × 10−5, the moment modification coefficient increases with increasing plastic rotation angle and is not greater than 0.37. In the range of 0.3~0.4, the moment modification coefficient decreases with increasing height of the relative compression zone.

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“…Prestressed steel reinforced concrete structures have the advantages of high bearing capacity and good seismic performance, which have been widely used in practical engineering, especially in the super-span and out-jacketing frame structure [1][2][3][4]. However, due to the uneven distribution of lateral stiffness and bearing capacity along the height of the out-jacketing building, it is necessary to have a comprehensive grasp of its overall seismic performance under rare earthquakes [5,6].…”

Section: Introductionmentioning

confidence: 99%

Research on Hysteretic Models for Prestressed and Non‐Prestressed Steel Reinforced Concrete Frames

Luo

Wang

2021

Advances in Civil Engineering

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The beam-column fibre model is used to simulate the entire hysteretic process of the prestressed and non-prestressed steel reinforced concrete frame, and the results are compared with the test results. Based on the analysis of a large number of parameters, the hysteretic curve characteristics of this kind of composite frame are discussed, and the load-displacement hysteretic models of single-storey and single-span composite frame are established. The models can comprehensively consider the influence of axial compression ratio and column slenderness ratio and can predict the hysteretic behaviour of this kind of composite frame under horizontal loads. The load-displacement hysteretic models are consistent with the numerical simulation results. Relevant research can provide reference for simplifying the elastic-plastic dynamic analysis of structures.

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Studies on the static behaviors of unbonded prestressed steel reinforced low-strength concrete rectangular frame beams

Cited by 10 publications

References 30 publications

Research on Ultimate Stress Increment of Unbonded Prestressed Steel Bars Based on Reliability

Research on Ultimate Stress Increment of Unbonded Prestressed Steel Bars Based on Reliability

Plastic Properties of Prestressed High-Strength Steel Reinforced Concrete Continuous Beams

Research on Hysteretic Models for Prestressed and Non‐Prestressed Steel Reinforced Concrete Frames

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