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Development of component stiffness equations for thread-fixed one-side bolt connections to an enclosed rectangular hollow section column under tension

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Frontiers of Structural and Civil Engineering 2024年第4期18卷 568-586页

作者： Fu-Wei WU Yuan-Qi LI Department of Structural Engineering Tongji UniversityShanghai 200092China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

The derivation and validation of analytical equations for predicting the tensile initial stiffness of threadfixed one-side bolts(TOBs),connected to enclosed rectangular hollow section(RHS)columns,is presented in this *** unknown stiffness components are considered:the TOBs connection and the enclosed RHS ***,the trapezoidal thread of TOB,as an equivalent cantilevered beam subjected to uniformly distributed loads,is analyzed to determine the associated *** on the findings,the thread-shank serial-parallel stiffness model of TOB connection is *** analysis of the tensile stiffness of the enclosed RHS face due to two bolt forces,the four sidewalls are treated as rotation constraints,thus reducing the problem to a two-dimensional plate *** to the load superposition method,the deflection of the face plate is resolved into three components under various boundary and load *** to the plate deflection theory of Timoshenko,the analytical solutions for the three deflections are derived in terms of the variables of bolt spacing,RHS thickness,height to width ratio,***,the validity of the above stiffness equations is verified by a series of finite element(FE)models of T-stub *** proposed component stiffness equations are an effective supplement to the component-based method.

关键词： initial stiffness component based method thread-fixed one-side bolt rectangular hollow sections analytical equation

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Experimental testing and evaluation of real-scale lap-splice bolted connections used in typical lattice steel transmission towers

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THIN-WALLED STRUCTURES 2022年 171卷 108790-108790页

作者： Taha, A. M. Dabaon, M. A. El-Boghdadi, M. H. Hassanein, M. F. Tanta Univ Fac Engn Dept Struct Engn Tanta Egypt Horus Univ Fac Engn New Damietta Egypt

Typically, lattice steel transmission towers (LSTTs) are built using bolted connections, although the performances of these connections are complicated. Generally, lap-splice bolted connections are used for long primary (leg) members to ensure their continuity. Herein, 17 lap-splice bolted joints, with real-scale dimensions as used in three LSTTs, are experimentally tested under compression, with the bolts being under shear. The considered three LSTTs carry 33 kV double-circuits overhead transmission lines, where the loading conditions and design are complied with the relevant requirements of the technical specification of ASCE-10/97 (2000). The main objective of this paper is to study the behaviour and failure mode of the lap-splice bolted joints of such three LSTTs, which are often considered either pinned or fully-rigid in practice. The joints relationships by means of the axial load versus joint deformation under shear forces on bolts are measured and evaluated, where the lap-splice bolted joints are found to show pre-slippage, slippage, bearing and plastic stages. The joints are found to fail due to bearing of either inner angle members or the splice plates. The axial stiffness of the lap-splice bolted joints is then obtained from these load-displacement curves. Moreover, stiffness and shear strength of the current joints are compared with the component based method (CBM), as presented in EN 1993 - 1 - 8 (2005). In this method, the structural steel joint under shear loading is treated as a multi-spring model composed of in-series springs, which enables obtaining its force-displacement relationship. The initial stiffness and strength comparison based on this simple method shows a good agreement with the experimental results. Additionally, the strength obtained by CBM is shown to conform to the experimental failure modes. based on the results, the laboratory experimental compression tests as well as CBM estimations of bolted lapsplice joints connections are usefu

关键词： Towers joints stiffness Lap-splice bolted connection Laboratory compression tests Lattice steel transmission towers Shear bolted connections component based method

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Analytical Investigation of Beam-to-Column Endplate Connections at Elevated Temperatures

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INTERNATIONAL JOURNAL OF STEEL STRUCTURES 2019年第2期19卷 398-412页

作者： Li, Yandi Zhao, Jincheng Shanghai Jiao Tong Univ Dept Civil Engn Shanghai 200240 Peoples R China

An analytical model to estimate the complete moment-rotation curve of steel beam-to-column endplate connections is presented in this paper. The method is based on the component-based concept and is capable of predicting the behavior of connections considering the influence of beam axial forces and temperature variations. Significant consideration is devoted to the reliable simulation of T-stub component. A recently developed T-stub model, which is based on the thin plate theory, is able to capture the force-deformation response of a T-stub assembly under fire situations. Verification of the analytical model is carried out by comparing with available experimental results of isolated connections in other literatures. The analytical model is also validated against a 3D finite element model, considering different axial load levels at different temperatures. The validation results illustrate the reliability and efficiency of the analytical model in predicting the initial stiffness and ultimate moment resistance of connections. However, the prediction of rotation capacity still needs some improvements, since the simulation of some basic components at elevated temperatures is not quite accurate. Also, some valuable rules are concluded on the behavior of connections subjected to different beam axial loads at different temperatures.

关键词： Steel connection Elevated temperatures component based method Bending moment and axial force Rotation capacity

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Modeling methods for Electric Loads in a Real Power Grid 5

Modeling Methods for Electric Loads in a Real Power Grid

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5th International Conference on Electrical and Electronics Engineering (ICEEE)

作者： Ju, Ping Wu, Feng Chen, Qian Han, Jingdong Tang, Yong Fan, Yue Hohai Univ Coll Energy & Elect Engn Nanjing Jiangsu Peoples R China China Elect Power Res Inst Beijing Peoples R China Northwest China Power Grid Xian Shaanxi Peoples R China

ISBN: (纸本)9781538663929

The electrical load has significant impact on the operation of power system. In the past decades, the component based method and the measurement based method were developed to build the load models. However, with the features of the randomness, variation and high order non-linearity, it is difficult to test the accuracy of the built load models. A load modeling method verification strategy is proposed in this paper. The component based load modeling method is performed based on the investigation of the electrical load composition to aggregated the parameters of the load model, while, the measurement based load modeling method uses dynamic measurement to estimate the parameters of the load model. They build the load model via different ways. In this condition, if the parameters obtained by different methods are similar, the effectiveness of the load modeling methods can be verified. These two load modeling methods are carried out in China North West power grid. The results demonstrate that the parameters of the load model obtained by different methods are close with each other. Hence, the component based method and the measurement based method are both effective in the modeling for the real electrical load.

关键词： power system electric load modeling component based method measurement based method

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A NUMERICAL INVESTIGATION OF STEEL FRAME ROBUSTNESS IN FIRE

A NUMERICAL INVESTIGATION OF STEEL FRAME ROBUSTNESS IN FIRE

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第八届结构火灾安全国际会议

作者： L.Chen China Building Technique Group CO. Ltd

This paper reports the results of a series of numerical parametric studies on robustness of steel frame in ***,it investigates effectiveness of providing alternative load paths as outlined in the UK Building Regulations[1].The scenario is removal of an internal column and the alternative load path is catenary action in the connected *** this situation,joint behaviour is the key to control progressive collapse whether at ambient temperature or in *** research incorporates realistic *** will investigate how joint details may be changed to improve structural robustness in *** results of this research indicate that it is not possible for a frame to survive fire attack without progressive collapse if one corner column is *** of removal of an internal column is possible,but only by hanging the beams on the upper ***,the vertical fire spread should be prevented to avoid structural progressive collapse.

关键词： Fire Robustness Catenary action Steel frame Joint component based method

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Development of component stiffness equations for bolted connections to RHS columns

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JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 2012年 70卷 137-152页

作者： Park, A. Y. Wang, Y. C. Univ Manchester Sch Mech Aerosp & Civil Engn Manchester M13 9PL Lancs England

This paper presents the derivation and validation of analytical equations for prediction of initial stiffness in bolted endplate connections to RHS columns based on the component method of joint characterisation. Analytical derivation of the equations is presented along with explanation of assumptions and simplifications used to reduce complexity. A comparative study with finite element simulation results shows that the equations for the RHS in transverse tension component can be used for all realistic joint geometries with an error of less than 10%. Validation against experimental results from France et al. (1999) show that when used in conjunction with existing equations given in Eurocode 3 Part 1.8 for other joint components such as endplate and bolts, predictions of joint initial stiffness had an average 9.2% error and a maximum 21.4% error which is acceptable for practical use. This is a significant improvement over existing equations where range of validity is severely limited and there is large error in predictions. (C) 2011 Elsevier Ltd. All rights reserved.

关键词： Initial stiffness component based method Joint Hollow section Analytical method

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Efficient modelling of large deflection behaviour of restrained steel structures with realistic endplate beam/column connections in fire

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ENGINEERING STRUCTURES 2012年 43卷 194-209页

作者： Chen, L. Wang, Y. C. Univ Manchester Sch Mech Aerosp & Civil Engn Manchester M13 9PL Lancs England

This paper compares the simulation results of three methods of using the commercial finite element package ABAQUS to model the very large deflection behaviour of steel structures with realistic endplate joints in fire. The results of a set of fire tests on restrained steel beam-column assemblies were used to check the accuracy of these different modelling methods. In the first modelling method, the fire exposed structural members, including the connections, were simulated using detailed solid elements to enable detailed behaviour of the structure to be faithfully represented. In the second method, the unexposed segments of the columns were represented by conventional line (beam) elements, the joints were represented using springs (Connector Elements) based on the component based method, and the beam was modelled using solid elements. In the third method, the joints were modelled using springs as in the second method and the beam and columns were simulated using line (beam) elements. As expected, the detailed simulation method was extremely time-consuming, but was able to produce accurate results. The simulation results from the second and third methods contained some inaccuracy, but depending on the simulation objective, their simulation results may be acceptable. In particular, the third simulation method was very efficient, suitable for simulating complete frame structures under very large deflections in fire. This paper will compare results from the three different simulation methods for different parts of the structure, including the fire exposed beam, the connection components and the columns, through different stages of fire exposure, from initial exposure to fire to the development of catenary action in the beam. From these comparisons of simulation results, this paper will recommend appropriate methods of modelling steel framed structures with realistic joints for different design objectives. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Restrained beam Joints component based method Large deflection Fire Elevated Temperatures Simulation methods

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Performance based Fire Engineering Research of Steel and Composite Structures: a Review of Joint Behaviour

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ADVANCES IN STRUCTURAL ENGINEERING 2011年第4期14卷 613-624页

作者： Wang, Yong C. Univ Manchester Sch Mech Aerosp & Civil Engn Manchester M60 1QD Lancs England

Joints are critical members of a structure at both ambient temperature and in fire. Under fire conditions, joint behaviour has crucial influence on control of fire induced progressive collapse of the structure. Joint behaviour in fire is also considerably more complex than that at ambient temperature, because the joint forces change at elevated temperatures in fire. This paper will present a review of some recent research studies on steel joint behaviour under fire conditions. These studies include temperatures in different components of different types of joint, mechanical behaviour of different joint components. experimental study and numerical modelling of joint behaviour, either as an individual joint or as part of a structure. Afterwards, this paper will present some results of the influence of joint behaviour on structural fire behaviour. Compared with other aspects of steel structural fire behaviour, research on joint behaviour in fire is relatively recent so comprehensive design guides are not yet available. Nevertheless, it is possible to provide some guidance on potential joint influence on improving steel structural fire resistance or reducing the risk of fire-induced progressive structural collapse.

关键词： joint connection fire resistance component based method component behaviour temperature calculation modelling structural interaction joint failure robustness joint design

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Fatigue Damage Assessment for Drillship Structure based on Stochastic method

Fatigue Damage Assessment for Drillship Structure based on S...

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18th International Offshore and Polar Engineering Conference (ISOPE 2008)

作者： Park, Sung-Gun Jang, Chang-Hwan Park, Jae-Hyung Heo, Joo-Ho Daewoo Shipbldg & Marine Engn Co Struct R&D Team Geoje Si Gyeongsangnam D South Korea

ISBN: (纸本)9781880653708

TOI drillship, first drillship of DSME, was designed to have more than 25 years' fatigue life against given environmental conditions. Fatigue damage in hull and hull-topside interface structures was assessed based on stochastic method. D-SAFS, developed by DSME, generates stress RAO based on 'component based method'. Structural analyses were carried out for each load component. Resultant stress was combined with wave load analysis results. Whole ship FE models having fine mesh in fatigue sensitive area were used in structural analysis. According to the agreement with Owner the vessel is assumed to spend 20% of her life in North Atlantic and 80% in On-site (Gulf of Mexico or Shetland in Summer Season). Some hot spots did not satisfy design fatigue life of 25 years for given sea states. Through geometry modification, structural reinforcement or improving fabrication method such as grinding, all structural details could satisfy design fatigue life of 25 years.

关键词： Drillship Fatigue component based method Stochastic Interface Structure stress RAO Moon Pool

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