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Influence of Fatigue Loading on the Residual Stress Distribution in Prestressing Steel Wires
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作者 Jesús Toribio Miguel Lorenzo Diego Vergara 《Journal of Civil Engineering and Architecture》 2012年第10期1338-1344,共7页
This paper analyzes the influence of fatigue loading on the residual stress profile in high strength steel wires. To this end, different sinusoidal loads with diverse values of maximum loading level and number of cycl... This paper analyzes the influence of fatigue loading on the residual stress profile in high strength steel wires. To this end, different sinusoidal loads with diverse values of maximum loading level and number of cycles were simulated on wires in which several residual stress profiles had been previously introduced, some of them with a tensile state and others with a compressive state. An analysis was made of the evolution with time of such residual stress laws by comparing them at key instants of loading, that is, at initial instant, at maximum load, at minimum load and at final instant. Numerical results show only a minor influence of fatigue loading on the residual stress profile. 展开更多
关键词 prestressing steel wires cold drawing FATIGUE residual stress redistribution
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Cyclic test and numerical study of seismic performance of precast segmental concrete double-columns
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作者 ZOU Shuang WENLIUHAN Hei-sha +2 位作者 MAO Yong-ping YU Bi-peng ZHANG Chong-bin 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第8期2502-2512,共11页
The comparative research on the seismic performance of grouted sleeve connected pier(GS)and prestressed precast segmental concrete pier(PC)is mostly carried out by numerical simulation.In this study,the GS pier and th... The comparative research on the seismic performance of grouted sleeve connected pier(GS)and prestressed precast segmental concrete pier(PC)is mostly carried out by numerical simulation.In this study,the GS pier and the PC pier of the new railway project from Hetian to Ruoqiang are taken into consideration.Two kinds of 1/5-scale assembled double-column specimens are made,and the quasi-static tests are carried out.The overall seismic performance of the two spliced piers is studied,and compared in terms of failure mechanism,bearing capacity,ductility,stiffness and energy dissipation capacity.The results show that the failure modes of both GS pier and PC pier are characterized by bending.However,the specific failure location and form are different.The GS pier presents a complete hysteretic curve,large equivalent stiffness and strong energy dissipation capacity.The hysteretic area of the PC pier is small.However,it has good self-reset ability and quasi-static residual displacement.Finite element models are set up using DispBeamColumn fiber elements and ZeroLength elements.The models that are calibrated with the test data can effectively simulate the damage development under monotonic loading.The load−displacement curves are in good agreement with the backbone curves of the test results. 展开更多
关键词 pseudo static test seismic performance prestressed precast segmental concrete double-column piers steel sleeve connection precast concrete prestressed steel
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Health Monitoring-Based Assessment of Reinforcement with Prestressed Steel Strand for Cable-Stayed Bridge
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作者 Kexin Zhang Tianyu Qi +2 位作者 Dachao Li Xingwei Xue Yanfeng Li 《Structural Durability & Health Monitoring》 EI 2022年第1期53-80,共28页
This paper presents the method of reinforcing main girder of reinforced concrete cable-stayed bridge with prestressed steel strands.To verify the effectiveness of external prestressed strand reinforcement method.Stati... This paper presents the method of reinforcing main girder of reinforced concrete cable-stayed bridge with prestressed steel strands.To verify the effectiveness of external prestressed strand reinforcement method.Static load tests and health monitoring-based assessment were carried out before and after reinforcement.Field load test shows that the deflection and stress values of the main girder are reduced by 10%~20%after reinforcement,and the flexural strength and stiffness of the strengthened beam are improved.The deflection and strain data of health monitoring of the specified section are collected.The deflection of the second span is 4 mm~10 mm,the strain range of the upper edge of the second span is-10με~-40με,and the strain range of the lower edge is 30με~75με.These values show the deflection and strain values fluctuate within a prescribed range,verifying the safety of the bridge.The reinforcement method of prestressed steel strand is feasible and effective.It can provide reference basis for the application of external prestressed strand reinforcement technology in similar projects. 展开更多
关键词 Prestressed steel strand REINFORCEMENT cable-stayed bridge load testing health monitoring
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The Design and Analysis of Long-Span and Low-Depth Prestressed Composite Steel-Concrete Beam Bridge
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作者 张俊平 黄海云 黄道沸 《Journal of Southwest Jiaotong University(English Edition)》 2002年第1期57-67,共11页
The design scheme of long span and low depth composite steel concrete beams is introduced, and the methods of avoiding the cracking of concrete deck in the negative moment regions are proposed. Moreover, significa... The design scheme of long span and low depth composite steel concrete beams is introduced, and the methods of avoiding the cracking of concrete deck in the negative moment regions are proposed. Moreover, significant exploration for problems of the composite beams has been made, such as optimizing construction steps to regulate the stress, applying jacking technique to exert prestress on the concrete deck, investigating the uplifting force principle of the shear connectors by means of model test and non linear finite element analysis, and pointing out the countermeasure to reduce tension force of the shear connectors. 展开更多
关键词 prestressed composite steel concrete beam construction step jacking technique shear connector
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Test analysis on prestressed concrete composite beams with steel boxes subjected to torsion and combined flexure and torsion 被引量:2
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作者 HU ShaoWei CHEN Liang 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第12期3302-3310,共9页
While modem prestressed techniques have improved the torsion properties of high-strength concrete (HSC) composite beams with prestressed steel (PS) boxes, no research has been reported in either the national or in... While modem prestressed techniques have improved the torsion properties of high-strength concrete (HSC) composite beams with prestressed steel (PS) boxes, no research has been reported in either the national or international literature on the an- ti-torque and composite torque properties of this type of beam. With the aim of understanding the torque properties of these beams, this paper presents results of ten comprehensive tests; three of these were based on stirrup spacings and prestressing levels as the main parameters, while the other seven were based on torsional rates. The torsion tests were conducted on the re- sults which established several key parameters, including curves of constant torsion, strain curves of steel torsion, strain distri- bution of steel beams and concrete, curves of bending-moment and mid-span deflection, as well as cross strain distribution.The prestressing impact-factor method was adopted to deduce semiempirical equations for cracking torque in such composite beams. Furthermore, this involves the use of the equation of ultimate torque based on tress-model-theory of the distortion an- gle, the calculated results show good agreement with the measured values. In summary, this paper offers theoretical analysis for future applications of HSC composite beams with PS boxes, and provides both validation of the methods employed and a reference point for on-going research on composite beams and related anti-torque studies. 展开更多
关键词 high-strength concrete composite beams prestressed steel boxes torsion property cracking torque ultimate torque combined torsion torsion-bending correlation equation
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