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Study on mechanism of fiber grouted material in pre-stressed anchor rope

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中国科学：技术科学英文版 2003年第Z1期46卷 188-197页

作者： HE Siming, QIAO Jianping & WANG Chenghua Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China Chinese Acad Sci Inst Mt Hazards & Environm Chengdu 610041 Peoples R China Minist Water Resources Chengdu 610041 Peoples R China

The fiber grouted material can reinforce the tension strength, shear strength as well as the index of fracture ductile, and remarkably improve the endurance of pre-stressed anchor rope under long-time loading. As a result, it has the better application foreground. Based on the shear log model and Hashin-Shtrikman upper and lower limited theorem, we have studied the mechanism of fiber grouted material applied in pre-stressed anchor rope and material property, and analyzed the effect of resistance strength of bond, resistance distribution of anchor section and the loading-deformation relationship of anchor body.

关键词： fiber grouted, pre-stressed anchor rope, shear log model, Hashin-Shtrikman upper-lower limited theorem.

Stress Analysis of New Type pre-stressed Anchor Bearing Plate Combining Stamping with Welding Forming and Its Anchorage Zone

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World Journal of Engineering and Technology 2017年第4期5卷 33-41页

作者： Daosen Chen Nianchun Deng Zanzhi Wang Haining Zuo Department of Civil Engineering and Architecture Guangxi University of Science and Technology Liuzhou China Department of Civil Engineering and Architecture Guangxi University Nanning China Liuzhou OVM Machinery Co. Ltd. Liuzhou China

An anchor bearing plate transfers the anchoring force from anchor plate to the concrete and the pre-stress is formed in the concrete structure. Currently, the main type of anchor bearing plate is cast iron. It is brittle during transportation and tension process. This paper presents a new type of anchor bearing plate combined stamping with welding forming. The structure of the new type anchor bearing plate is introduced. The stress states of the anchor bearing plate and anchorage zone under work are studied. Various specifications of anchor bearing plate are studied by ANSYS finite element analysis software following the AASHTO specification. The analysis results are compared with the results of the same type of OVM round-shaped anchor plate. The study results show that the new pre-stressed anchor plates combined stamping with welding forming are feasible and more sturdy which can meet the engineering demand.

关键词： pre-stressed Concrete Structure Finite Element Analysis Anchor Bearing Plate Stress of Anchorage Zone

Interaction between transverse isotropy rock slope and supporting structure

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Journal of Central South University 2008年第S1期15卷 415-423页

作者：段靓靓方理刚 College of Civil Engineering Architecture and MechanicsCentral South University of Forestry and Technology School of Architectural and Civil Engineering Central South University

In order to study the interaction between transverse isotropy rock mass and supporting structure,the laboratory tests for rock sampled from the slope at expressway project were carried out,and the parameters of elasticity for transverse isotropic rock were determined by the uniaxial compression tests for rock sample with different strike of stratification ***,based on the relationship of stress-stain for transverse isotropic rock mass,the analytical model was established for the interaction between transverse isotropic rock mass and frame beam with pre-stressed anchor ***,the conception of the best anchorage-angle in pre-stressed anchor cable was *** last,the parameters of the interaction between transverse isotropy rock mass and frame beam with pre-stressed anchor cable were investigated by finite element method,and the best anchorage-angle in pre-stressed anchor cable was *** rules of the influence of the directivity of stratification plane on supporting structure were *** results show that the analytical model and numerical method on the design of pre-stressed anchor cable with frame beam supporting for transverse isotropy rock slope are reasonable and reliable in practical engineering design.

关键词： rock mechanics transverse isotropy pre-stressed anchor cable frame beam finite element analysis anchorage angle

Effect of concrete creep on pre-camber of continuous rigid-frame bridge

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Journal of Central South University 2008年第S1期15卷 337-341页

作者：贺国京李媛媛邹中权段靓靓 College of Civil and Architecture and Mechanics Central South University of Forestry and Technology School of Civil and Architectural Engineering Central South University

The effect of concrete creep on the pre-camber of a long-span pre-stressed concrete continuous rigid-frame bridge constructed by cantilever casting method was *** difference of creep coefficients calculated with two Chinese codes was *** on the calculations,the pre-camber of a pre-stressed concrete continuous rigid-frame box bridge was computed for construction control *** results show that the short-term creep coefficient and long-term creep coefficient calculated with the CC-1985 are larger than those calculated with the CC-2004,while the medium-term creep coefficient calculated with the CC-1985 is smaller than that calculated with the *** difference of creep deformation calculated with these two codes is small,and the influences of concrete creep on the pre-camber for most of the segments are *** deflections and stresses of the box girder measured during the construction stages agree very well with the predictions.

关键词： creep pre-stressed concrete continuous rigid-frame bridge cantilever casting method pre-camber

Two new reinforcement techniques applicable in high steep slopes along the Chengdu-Lhasa Highway, Southwest China

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Science China(Technological Sciences) 2003年第Z1期46卷 156-162页

作者： YANG ZhifaZHU Jiewang ZHANG Luqing, CUI Peng, LI Xiao & SHANG Yanjun Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China Chinese Acad Sci Inst Mt Hazards & Environm Chengdu 610041 Peoples R China Minist Water Resources Chengdu 610041 Peoples R China

Anti-slide pile and anchoring hole are two types of reinforcement techniques popularly used in slope reinforcement. However, some defects of these two techniques are found in slope engineering practices. Utilizing higher tensile strength of pre-stressed structures, the authors devise two new types of slope reinforcement techniques, i.e. pre-stressed anchoring beam and pre-stressed anti-slide pile, in an attempt to overcome those defects of the existing techniques. These two new techniques are characterized by gathering multiple functions, e.g. engineering investigation, reinforcement, drainage, monitoring and strength supplement, so as to achieve high reinforcement efficiency, convenient checking, and higher ratio of function to cost. It is hoped that, if applying these two new techniques in remedies of landslide hazards along the Chengdu-Lhasa Highway, better reinforcement effects will be obtained.

关键词： rock slope, pre-stressed anchoring beam, pre-stressed anti-slide pile.

Inspection and Assessment of Highway Bridges in Jordan along the Desert Highway: A Case Study

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Open Journal of Composite Materials 2019年第3期9卷 249-259页

作者： Hamadallah Al-Baijat Mohammad Alhawamdeh Department of Civil Engineering Faculty of Engineering Tafila Technical University Tafila Jordan

Bridges, especially highway bridges, are a key factor in nations’ development and flourish. Thus, great care should be taken to maintain and inspect their safety and serviceability. An immediate repair will prevent the loss of life and vehicles damage while crossing underpass and overpassing the heavy deteriorated bridges. Reinforced or pre-stressed concrete bridge girders become structurally deficient because of severed reasons including, increasing in the load requirements, corrosion of pre-stressing strands or reinforcement bars and collision of over-height trucks with the bulb of the concrete girders. The purpose of this case study is to evaluate and assess the damages of the highway bridges in Jordan. Since there is no mandatory program in Jordan for inspection of bridges and evaluating their conditions, this paper presents an inspection and assessment of two highway bridges along the desert highway which is the essential nerve connecting Jordan cities, and it also serves as an international road between many middle east countries. These two Bridges have never been investigated or checked since their construction in the late 1980s. The study results showed that the main factor causing the deterioration of these bridges is the collision of the over-height trucks with their elements. Relying on the collected data, solutions and repair methods were introduced to rehabilitate these bridges and assure their structural safety.

关键词： Bridge Inspection Reinforced Concrete Beam pre-stressed Girder Concrete Steel Reinforcement Case Study

Strengthening of Concrete Box Girder Bridges under Close-in Detonations

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Journal of Civil Engineering and Architecture 2012年第6期6卷 699-706页

作者： Ahmed Ibrahim Hani Salim Department of Civil Engineering and Construction Bradley University Peoria IL 61625 USA Department of Civil and Environmental Engineering University of Missouri Columbia MO 65211 USA

The response of a bridge superstructure under blast loading might depend largely on the extent of the local damage experienced due to close-in explosion threats. This paper investigates the local and structural response of box girder bridge decks strengthened using CFRP （carbon fiber reinforced polymers） under close-in detonations. Due to the lack of experimental research on this topic, the study is conducted using the explicit finite element computer program LS-DY-NA. The numerical study will be verified using the results of strengthened reinforced concrete slabs under field detonations. The blast load was assumed to be detonated above the bridge deck. The key parameters investigated are the charge size, and the strengthening location on the deck. This paper will present the results of this investigation and provides recommendations for predicting the local damage level based on the CFRP strengthening design under blast threat.

关键词： pre-stressed blast box girder bridges carbon fiber.