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Nonlinear experimental response of non-conventional composite steel and concrete connection

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Frontiers of Structural and Civil Engineering 2009年第1期3卷 42-49页

作者： Tobia ZORDAN bruno briseghella College of Civil Engineering Tongji UniversityShanghai 200092China IUAV University of Venice DCA Department of Construction of ArchitectureVeniceItaly

An experiment was carried out on a set of fullscale specimens of a non-conventional connection between a concrete column and a composite steel and concrete beam defined on the basis of a number of *** proposed connection,conceived in the ambit of semirigid joints,is aimed at combining general ease of construction with a highly simplified assembly procedure with a satisfying transmission of hogging moment at supports in continuous *** this purpose,the traditional shear studs used at the interface between the steel beam and the upper concrete slab,are also employed at the ends of the steel profiles welded horizontally to the end *** test is aimed at investigating the hogging moment response of the connection under incremental loads until failure.

关键词： composite connections nonlinear behaviour hogging moment monotonic tests

Curved footbridges supported by a shell obtained through thrust network analysis

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第1期6卷 65-75页

作者： Luigi Fenu Eleonora Congiu Davide Lavorato bruno briseghella Giuseppe Carlo Marano Department of Civil and Environmental Engineering and Architecture University of Cagliari Department of Architecture University of Roma Tre College of Civil Engineering Fuzhou University Department of Sciences of Civil Engineering and Architecture Polytechnic University of Bari

After Maillart's concrete curved arch bridges were built before the Second World War, in the second half of the past century and this century, many curved bridges have been built with both steel and concrete. Conversely, since the construction of Musmeci's shell supported bridge in Potenza, few shell bridges have been constructed. This paper explains how to design a curved footbridge supported by an anticlastic shell by shaping the shell via a thrust network analysis(TNA). By taking advantage of the peculiar properties of anticlastic membranes, the unconventional method of shaping a shell by a TNA is illustrated. The shell top edge that supports the deck has an assigned layout, which is provided by the road curved layout. The form of the bottom edge is obtained by the form-finding procedure as a thrust line, by applying the thrust network analysis(TNA) in a non-standard manner,shaping the shell by applying the boundary conditions and allowing relaxation. The influence of the boundary conditions on the bridge shape obtained as an envelope of thrust lines is investigated. A finite element analysis was performed. The results indicate that the obtained shell form is effective in transferring deck loads to foundations via compressive stresses and taking advantage of concrete mechanical properties.

关键词： Shell footbridges Cantilevered deck Anticlastic shell Thrust network analysis(TNA) Concrete

Finite element model updating of a tied-arch bridge using Douglas-Reid method and Rosenbrock optimization algorithm

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第4期1卷 280-292页

作者： Tobia Zordan bruno briseghella Tao Liu Department of Structural Engineering Tongji University College of Civil Engineering Fuzhou University Department of Architecture Construction and ConservationUniversity IUAV di VeneziaDorsoduroVeniceItaly

Condition assessment of bridges has become increasingly important. In order to accurately simulate the real bridge, finite element （FE） model updating method is often applied. This paper presents the calibration of the FE model of a reinforced concrete tied-arch bridge using Douglas-Reid method in combination with Rosenbrock optimization algorithm. Based on original drawings and topographic survey, a FE model of the investigated bridge is created. Eight global modes of vibration of the bridge are identified by ambient vibration tests and the frequency domain decomposition technique. Then, eight structural parameters are selected for FE model updating procedure through sensitivity analysis. Finally, the optimal structural parameters are identified using Rosenbrock optimization algorithm. Results show that although the identified parameters lead to a perfect agreement between approximate and measured natural frequencies, they may not be the optimal variables which minimize the differences between numerical and experimental modal data. However, a satisfied agreement between them is still presented. Hence, FE model updating based on Douglas-Reid method and Rosenbrock optimization algorithm could be used as an alternative to other complex updating procedures.

关键词： tied-arch bridge finite element model updating ambient vibration test experimental modal data Douglas-Reid method Rosenbrock algorithm

To compute or not to compute?

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第1期6卷 85-93页

作者： Alessandra Fiore Ivo Vanzi Camillo Nuti Cristoforo Demartino Rita Greco bruno briseghella Department of Engineering and Geology University of Chieti-Pescara "G.d'Annunzio" DICAR Department of Civil Engineering and Architecture Polytechnic University of Bari College of Civil Engineering Fuzhou University Department of Architecture Roma Tre University College of Civil Engineering Nanjing Tech University DICATECH Department of Civil Engineering Environment Territory Building and Chemical Polytechnic University of Bari

In a previous paper "to retrofit or not to retrofit?"(Nuti and Vanzi, 2003) a straightforward procedure able to forecast the economic return of seismic structural upgrading was presented. More recently, the authors realized that the final mathematical results can be much simplified so as to allow back-of-an-envelope computation. The title of this paper tries to highlight precisely this aspect, namely that for many a regular seismic structural upgrading cases, nearly no computation is needed(apart from one subtraction and one multiplication) to assess their economic convenience. These findings are presented and discussed in this paper, together with a state of the art on the cost-studies available in literature and technical codes. The mathematical formulation leading to the proposed approximation is suitably explained, underlining its applicability field and comparing it with the rigorous solution. Also a table and a formula are furnished that alternatively allows to calculate the maximum estimation errors, in order to obtain an upper and lower bound for the maximum amount of money which should be allocated for seismic structural upgrading.

关键词： Seismic retrofitting Structural reliability Safety Optimization Cost minimization

Parametric Analysis on an IAB Superstructure

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施工技术 2010年第1期39卷 111-119页

作者： Tobia Zordan bruno briseghella Cheng Lan University IUA V of Venice Venezia-Mestre 1-30173 Italy College of Civil Engineering Tongji University Shanghai 200092 China

Integral abutment bridges(IABs) are jointless bridges where the girder or the deck is continuous and connected monolithically to the abutments.A usual and important problem in the design of IABs is how to deal with the soil-structure interaction behind the abutments and next to the foundation piles: this can be considered as a fundamental aspect for the thorough understanding of this type of structures,which requires iterative and nonlinear *** this paper,a 2D simplified finite-element model of a real 400 meters long IAB,built in the Province of Verona-Italy,is implemented and used to perform non linear analysis on the bridge,whose superstructure response is examined in details in the present ***,the results obtained from a parametric study on the IAB,where the soil properties are varied behind the backwall and adjacent to the piles are varied,are *** the end,a pushover analysis is carried out to assess the failure pattern of the bridge due to temperature change,considered as one of the key parameters in IABs design;finally,the effect of abutment stiffness is also *** case study presented represents the world record for this kind of *** believe this can be a cost effective and an efficient strategy to improve the durability and extend the life span of commonly built simply supported flyovers prone to maintenance problems due to bearings and expansion joints durability.

关键词：道路建设 IABs 施工技术项目管理

Use of Plastic Correction Formula to Improve Accuracy of Welding Residual Stress Test with Blind-Hole Method

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Transactions of Tianjin University 2018年第5期24卷 480-488页

作者： Qiu Zhao Kongsheng Chen Meizhong Chen bruno briseghella Zhiyong Guo Guotao Yang College of Civil Engineering Fuzhou University School of Civil and Environmental Engineering Centre for Infrastructure Engineering and Safetythe University of New South WalesUNSW

The blind-hole method is the most widely used approach to experimentally determine the distribution of residual stress. This paper aims to improve test accuracy of welding residual stress and conducts an experimental study on the strain release factors involved when using the blind-hole method for Q235 and Q345, two steels commonly used in building structures. The ranges of strain release factors A and B in the elastic stage, the effects of strain release factors on residual stress calculated values, and the plastic corrected strain release factors are analyzed considering of the effect of plastic deformation around the blind hole on measurement accuracy. Finally, a simplified calculation formula to determine strain release factors is proposed for use with the blind-hole method. Results show that in the elastic stage, strain release factor A for Q235 and Q345 ranges from-0.399 to-0.525 and strain release factor B from-0.791 to-0.960. Changing the strain release factors A and B shows that calculated residual tensile stress varies in relation to a decrease in both factor values. However, there is a increase in calculated residual compressive stress with a decrease in the strain release factor A value, but there is an decrease with a decrease in strain release factor B value. Calculated residual stress applied to elastic strain release factors is compared with that applied to amended plastic strain release factors for Q235 steel. The maximum deviation between calculated residual stress and test stress is reduced from 21.1 to 1.0%,and for Q345 steel from 26.5 to 1.2%. It is thus evident that the plastic correction formula proposed in this paper can be used in calculations when conducting a residual stress test.

关键词： Blind-hole method Welding residual stress·Calibration test Strain release factor Plastic correction

Behaviour of a Moment Resisting Composite Steel and Concrete Joint Under Alternate Loading

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施工技术 2011年第6期40卷 93-101,110页

作者： Alberto Zanchettin bruno briseghella Tobia Zordan Università IUAV di Venezia College of Civil Engineering Fuzhou University College of Civil Engineering Tongji University

The authors show the results of a study conducted on a joint connecting a concrete column to a composite steel concrete floor,subjected to tension on the beams as a result of the decomposition of sagging bending *** beam to column connection is achieved by means of headed studs welded to the beam and embedded in the concrete *** different configurations have been tested at failure and the results are compared to formulae proposed in *** degrees of ductility,reliability and strength have been obtained varying geometry and reinforcement ratio on the joints tested.

关键词： composite steel concrete joint laboratory test analysis alternate loading

Design and field tests of a deck-extension bridge with small box girder

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Journal of Traffic and Transportation Engineering(English Edition) 2018年第6期5卷 467-479页

作者： Junqing Xue bruno briseghella Jianhui Lin Fuyun Huang Baochun Chen College of Civil Engineering Fuzhou University

A jointless bridge could fundamentally eliminate vulnerable deck joints, thereby meeting the need for sustainable development of bridges, especially for an expressway with highspeed traffic. In this paper, one jointless bridge(deck-extension bridge) with a small box girder in an expressway was chosen as a case study to examine the structural design,construction and field test. The field tests of the bridge indicated that the designed and constructed structures can satisfy the requirement for service performance of the deckextension bridge. Some key technologies, such as the position of longitudinal reinforcements in the superstructure-approach slab connections and the arrangement of the sliding material layers, were introduced. The longitudinal thermal movement of the superstructure in the deck-extension bridge with a small box girder could be predicted accurately by using the average temperature of the cross section of a small box girder. The finite element model, built by using the MIDAS program, was used to analyze the temperature distribution on the cross section of a small box girder, the accuracy of which could be verified by comparing with the measured values. The maximum longitudinal thermal movement of the superstructure in deck-extension bridges with a small box girder under historically extreme temperature conditions was predicted.

关键词： Jointless bridge Deck-extension bridge Small box girder Longitudinal thermal movement Temperature distribution Average temperature

Probabilistic seismic response and uncertainty analysis of continuous bridges under near-fault ground motions

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Frontiers of Structural and Civil Engineering 2019年第6期13卷 1510-1519页

作者： Hai-Bin MA Wei-Dong ZHUO Davide LAVORATO Camillo NUTI Gabriele FIORENTINO Giuseppe Carlo MARANO Rita GRECO bruno briseghella College of Civil Engineering Fuzhou UniversityFuzhou 350108China Department of Architecture Roma Tre UniversityRoma 00154Italy College of Civil Engineering and Architecture Politecnico di Bari UniversityBari 70126Italy

Performance-based seismic design can generate predictable structure damage result with given seismic ***,there are multiple sources of uncertainties in the seismic design process that can affect desired performance *** paper mainly focuses on the effects of near-fault pulse-like ground motions and the uncertainties in bridge modeling on the seismic demands of regular continuous highway *** modeling a regular continuous bridge with OpenSees software,a series of nonlinear dynamic time-history analysis of the bridge at three different site conditions under near-fault pulse-like ground motions are carried *** relationships between different Intensity Measure(IM)parameters and the Engineering Demand Parameter(EDP)are *** selecting the peak ground acceleration as the most correlated IM parameter and the drift ratio of the bridge column as the EDP parameter,a probabilistic seismic demand model is developed for near-fault earthquake ground motions for 3 different site *** this basis,the uncertainty analysis is conducted with the key sources of uncertainty during the finite element *** the results are quantified by the"swing"base on the specific distribution range of each uncertainty parameter both in near-fault and far-fault *** the ground motions are selected from PEER database,while the bridge case study is a typical regular highway bridge designed in accordance with the Chinese Guidelines for Seismic Design of Highway *** results show that PGA is a proper IM parameter for setting up a linear probabilistic seismic demand model;damping ratio,pier diameter and concrete strength are the main uncertainty parameters during bridge modeling,which should be considered both in near-fault and far-fault ground motion cases.

关键词： continuous bridge probabilistic seismic demand model Intensity Measure near-fault uncertainty