Australian Journal of Structural Engineering最新文献_第4页

Investigating the dynamic behaviour of a railway bridge subjected to over-height vehicle collision 铁路桥梁在车辆碰撞作用下的动力特性研究

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2023-02-21 DOI: 10.1080/13287982.2023.2176972

Amirhesam Taghipour, J. Zakeri, M. Jahangiri, S. Mosayebi

{"title":"Investigating the dynamic behaviour of a railway bridge subjected to over-height vehicle collision","authors":"Amirhesam Taghipour, J. Zakeri, M. Jahangiri, S. Mosayebi","doi":"10.1080/13287982.2023.2176972","DOIUrl":"https://doi.org/10.1080/13287982.2023.2176972","url":null,"abstract":"ABSTRACT Full service without defects of railway bridges is more important than highway bridges because failure at a part of the bridge results in the blockage of the entire track and the stopping of the trains. In recent years, the problem of an over-height vehicle collision to the bridge superstructure has occurred more frequently. These collisions damage the bridge superstructure and affect the safety of the train causing many problems in railway transportation. In this study, first, a model of the concrete girder bridge was used to validate the effect of the collision load applied to the bottom of the concrete girder bridge. Then, the dynamic responses of the railway bridge simulated as concrete girders and bridge deck also track including rail, sleeper, and ballast are presented by using the finite element method. Finally, the different sensitivity analyses express that changing the bridge span length, and the value of collision loads affect the concrete girder lateral displacement at the contact area. The results show that the lateral displacements decrease with increasing the span length. Additionally, by increasing the collision forces due to increasing the velocity of the impacting object, the lateral displacement at the bottom of the girder reduces.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85363663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Reliability interpretation of redundancy on design and seismic behaviour of steel conveyors 钢输送机设计和抗震性能冗余的可靠性解释

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2023-02-19 DOI: 10.1080/13287982.2023.2176025

L. Haj Najafi, H. Rajabi

{"title":"Reliability interpretation of redundancy on design and seismic behaviour of steel conveyors","authors":"L. Haj Najafi, H. Rajabi","doi":"10.1080/13287982.2023.2176025","DOIUrl":"https://doi.org/10.1080/13287982.2023.2176025","url":null,"abstract":"ABSTRACT This study investigates the effect of redundancy incorporation as static indeterminacy and possibility to utilise alternative load paths in design and seismic behaviour of steel truss bridge conveyors by conducting complementary reliability assessments. The results could be supportive in adjusting the degree of indeterminacy, especially for long structures, to convince the design goals. It is conceived that the design approach with lower indeterminacy donates to less structural weight in addition to a bit more fundamental period contributing to less earthquake-induced demands and easily controllable lateral drifts in the end reference points which are very crucial in view of connecting to the adjacent structures. On the other hand, providing more indeterminacy in conveyor design could bring about more ductility, nonlinear displacement and earthquake energy dissipation as well as closer nonlinear behavioural parameters to the amounts recommended by the design code. In reliability assessments by increasing the degree of indeterminacy, the failure probability is reduced which contributes to the design with higher reliability indexes and higher collapse safety margin and it is expected that the incorporation of redundancy effects would be more perceivable by providing models with more redundancy discrepancy.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90897306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural reliability and partial safety factor assessment of unreinforced masonry in vertical bending 无筋砌体竖向弯曲结构可靠性及部分安全系数评定

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2023-02-17 DOI: 10.1080/13287982.2023.2173868

Andrea Isfeld, M. Stewart, M. Masia

{"title":"Structural reliability and partial safety factor assessment of unreinforced masonry in vertical bending","authors":"Andrea Isfeld, M. Stewart, M. Masia","doi":"10.1080/13287982.2023.2173868","DOIUrl":"https://doi.org/10.1080/13287982.2023.2173868","url":null,"abstract":"ABSTRACT This paper focuses on a structural reliability-based assessment of clay brick unreinforced masonry (URM) walls subjected to uniformly distributed out-of-plane loads in one-way vertical bending. Stochastic models combining finite element analysis (FEA) and Monte Carlo simulations (MCS) are used to account for spatial variability of the flexural tensile bond strength when estimating the wall failure loads. The strength of URM walls is known to be influenced by the flexural tensile bond strength, which is subject to high spatial variability as batching, workmanship, and environmental exposure alter the strength of this bond. For this assessment, single skin walls have been considered with bond strength statistics seen in typical construction. The model error statistics available for similar walls are combined with the results of the spatial stochastic FEA and probabilistic load models to determine the reliability index corresponding to the Australian Standard for Masonry Structures AS 3700 design of members in vertical bending. It was found that existing levels of reliability exceed target reliabilities, and the capacity reduction factor can be increased from 0.60 to 0.65 for URM walls in one-way vertical bending while still providing an acceptable level of reliability. A sensitivity analysis showed this finding to be robust.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75756575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Evaluation of mechanical properties of steel slag as replacement for fine and coarse aggregate in concrete 钢渣替代粗、细骨料在混凝土中的力学性能评价

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2023-01-17 DOI: 10.1080/13287982.2023.2167644

B. Pushpakumara, Ttd Silva

{"title":"Evaluation of mechanical properties of steel slag as replacement for fine and coarse aggregate in concrete","authors":"B. Pushpakumara, Ttd Silva","doi":"10.1080/13287982.2023.2167644","DOIUrl":"https://doi.org/10.1080/13287982.2023.2167644","url":null,"abstract":"ABSTRACT Steel slag is a melted by-product that mainly consists of calcium carbonate and metal oxides generated in the process of steel manufacturing. The main objectives of this study are to evaluate the effectiveness of steel slags as fine and coarse aggregates in concrete and to determine the optimum quantity of steel slag as fine and coarse aggregates to enhance the strength of concrete. Concrete cubes were cast by mixing steel slag as replacement (i.e. 0%, 10%, 25%, 50%, 75% and 100%) for fine and coarse aggregate, separately. Abrasion test, sieve analysis, water absorption and specific gravity test were conducted to determine the properties of raw materials. Unit weight, workability, compressive strength, splitting tensile strength and the possibility of corrosion were experimentally evaluated to determine the effectiveness of steel slag. It is found that 75% steel slag mixed concrete indicates improvements in compressive strength, splitting tensile strength and unit weight, respectively. Further, it was noted that steel slag aggregates were not corroded after conducting the Accelerated Corrosion Test Method (ACTM). Therefore, the use of steel slag as fine and coarse aggregates for concrete would improve the mechanical properties of concrete and reduce the adverse environmental impact.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89657971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Shear strengthening design of pre-cracked reinforced concrete beams using bonded and bolted steel plates 预裂钢筋混凝土梁用粘结和螺栓连接钢板的抗剪加固设计

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2022-12-12 DOI: 10.1080/13287982.2022.2156167

M. Rakib, Abu Zakir Morshed

{"title":"Shear strengthening design of pre-cracked reinforced concrete beams using bonded and bolted steel plates","authors":"M. Rakib, Abu Zakir Morshed","doi":"10.1080/13287982.2022.2156167","DOIUrl":"https://doi.org/10.1080/13287982.2022.2156167","url":null,"abstract":"ABSTRACT A design guideline for shear strengthening of pre-cracked reinforced concrete (RC) beams using steel plates has been presented in this research by modifying the available shear capacity formulas. An experimental investigation was also carried out in order to validate the proposed guideline. Total five RC beams were fabricated, among which four beams were pre-cracked in shear by applying preloads. Two of the cracked beams were then strengthened with adhesive bonded steel plates while the rest two were strengthened with bolted steel plates. Variation was made in plate depth and bolt layers. The shear performance of the strengthened beams was evaluated by testing the beams to their ultimate capacity. Experimental results indicated that the shear capacity, ductility and stiffness of the pre-cracked beams increased significantly after strengthening with continuous steel plates. The shear capacity varied from 131% to 201% for strengthened beams compared to the control beam. Deeper plates offered better shear performance than the shallower plates. Modification of the existing formulas by introducing preload factors for estimating the shear capacity of the strengthened beams showed a good agreement with the experimental shear capacity.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74286776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the dynamic behaviour of Bafgh-Bandar Abbas lane railway bridge for structural health monitoring purpose 巴格尔-阿巴斯港线铁路桥结构健康监测动力特性研究

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2022-11-27 DOI: 10.1080/13287982.2022.2149975

Amir Pourtarki, H. Badri Ghavifekr, H. Afshin

{"title":"Study on the dynamic behaviour of Bafgh-Bandar Abbas lane railway bridge for structural health monitoring purpose","authors":"Amir Pourtarki, H. Badri Ghavifekr, H. Afshin","doi":"10.1080/13287982.2022.2149975","DOIUrl":"https://doi.org/10.1080/13287982.2022.2149975","url":null,"abstract":"ABSTRACT This paper uses the vibration-based damage detection method for structural health monitoring of a Railway Bridge. Hence, the bridge had been exactly modelled in finite element analysis software. Due to the elastomeric bridge bearing, direct calculating of the natural frequencies and extracting the mode shapes of the bridge is not suitable and effective. Therefore, a time-dependent transient analysis of the train movement on the bridge is done and then the vibrations of all truss cells during the train crossing period were extracted. Afterwards, the relevant data is transformed, which represents the natural frequencies of the bridge vibration and their amplitude at each point. In the following, the mode shapes of vibration and the distribution of vibration energy are calculated. Applying any artificial damages in the model, occurring changes in the natural frequencies, mode shapes, and the vibration energies of the modes, are examined. Consequently, detecting and locating damages in the structure has been done with acceptable accuracy. Finally, for validation of the results, an accelerometer is installed on the bridge truss in the middle part of the bridge to extract the acceleration of bridge vibration at the train crossing time interval. In the end, the results are compared and presented.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90066601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Response of perforated H-pile subjected to coupled lateral displacement history and axial loading 横向位移历史和轴向荷载耦合作用下h形孔桩的响应

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2022-11-25 DOI: 10.1080/13287982.2022.2149914

Hrishikesh N. Shedge, Manoj Kumar

{"title":"Response of perforated H-pile subjected to coupled lateral displacement history and axial loading","authors":"Hrishikesh N. Shedge, Manoj Kumar","doi":"10.1080/13287982.2022.2149914","DOIUrl":"https://doi.org/10.1080/13287982.2022.2149914","url":null,"abstract":"ABSTRACT The substructure of an integral abutment bridge is designed to accommodate the lateral demand induced by the expansion and contraction of the bridge deck. The assembly of H-piles oriented about their weak axis of bending and aligned in a single row with a rigid connection to the abutment is most preferred for supporting the integral abutment bridges. The weak axis orientation of H-pile allows for higher displacement capacity, thus accommodating the cyclic thermal demand induced by a superstructure. The hysteretic response of H-piles is suggestive of the early onset of the plastic hinge formation, which helps in accommodating the cyclic demand. The H-piles in the integral abutment bridge experience low cycle fatigue induced by cyclic thermal variations, resulting in the buckling of flanges at the critical zone. This study assesses the impact of perforation made on H-pile flanges at the critical buckling zone. In this study, six unique geometries of perforations are modelled and analysed using combined nonlinear kinematic and isotropic hardening formulation. The hysteretic response of the perforated H-pile models has been compared with an unperforated model to assess the proposed perforation geometry's impact on the H-pile's hysteretic response.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81903510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical study on the stiffness and ultimate strength of cold-formed steel C-shaped connectors under pull-out failure 冷弯型钢c形连接件拉拔破坏下刚度和极限强度的数值研究

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2022-11-24 DOI: 10.1080/13287982.2022.2149977

M. Obeydi, Iman Mohammadpoor Baltork, M. Zeynalian

引用次数: 1

Seismic performance evaluation of code compliant and non-compliant RC walls 符合规范和不符合规范的RC墙抗震性能评价

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2022-10-26 DOI: 10.1080/13287982.2022.2133721

Ali Siddique, Tahir Mehmood, S. Qazi, Shahzad Khan, Adnan Nawaz, R. F. Tufail

{"title":"Seismic performance evaluation of code compliant and non-compliant RC walls","authors":"Ali Siddique, Tahir Mehmood, S. Qazi, Shahzad Khan, Adnan Nawaz, R. F. Tufail","doi":"10.1080/13287982.2022.2133721","DOIUrl":"https://doi.org/10.1080/13287982.2022.2133721","url":null,"abstract":"ABSTRACT Pakistan’s unique geographical location has made it seismically vulnerable. Owing to this, recent earthquakes have revealed the susceptibility of the existing reinforced concrete (RC) buildings in Pakistan. This has raised concerns about the structural performance of RC buildings because most mid-rise RC buildings in Pakistan have shear wall lateral force resisting systems. In this study, a survey of existing mid-rise RC buildings in Pakistan's capital territory is used to develop a database of existing RC shear walls. By using this database, this research aims to provide a seismic performance assessment of existing RC shear walls to determine their deficiencies and provide necessary experimental data for retrofitting. Two RC shear wall specimens SW1 and SW2, representing the characteristics of existing RC shear walls are tested under quasi-static loading. The seismic response of the existing RC mid-rise walls is assessed through the mode of failure, hysteretic behavior, energy dissipation, flexure and shear stiffness, and curvature distribution. The findings reveal that the existing mid-rise RC walls in the region did not satisfy the performance criteria recommended by different seismic codes. Hence a comprehensive retrofitting strategy with building code compliance are prerequisites to avoid infrastructural and economic losses due to seismic activity.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80086986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilistic assessment of ACI 318 minimum thickness requirements for two-way slabs 双向板aci318最小厚度要求的概率评估

IF 1.1

Australian Journal of Structural Engineering Pub Date : 2022-10-19 DOI: 10.1080/13287982.2022.2134354

Khaled Ahmat, Samer M. Barakat, S. Altoubat, Mohamad Alhalabi

{"title":"Probabilistic assessment of ACI 318 minimum thickness requirements for two-way slabs","authors":"Khaled Ahmat, Samer M. Barakat, S. Altoubat, Mohamad Alhalabi","doi":"10.1080/13287982.2022.2134354","DOIUrl":"https://doi.org/10.1080/13287982.2022.2134354","url":null,"abstract":"ABSTRACT Following the ACI 318 design code and to control deflections, structural engineers must adhere to minimum thickness requirements for reinforced concrete (RC) slabs. However, these requirements do not account for various influencing variables such as span length, aspect ratio and applied live load. This paper assesses the adequacy of the ACI 318 minimum thickness requirements for two-way RC slabs through a probabilistic approach using Monte Carlo simulation (MCS). The probability distribution of the span-to-depth ratio (SDR) was fitted to the Burr distribution, and the goodness-of-fit test was applied to assess the fitting. Then, the effect of span length, aspect ratio, and live load on the maximum allowable SDR was evaluated, considering all material properties and applied loads as random variables. The analyses have shown a high correlation between the studied variables and the SDR. Therefore, multiple regression analysis was carried out, and four prediction models were proposed to conservatively predict the SDR for two-way slabs. The accuracy of the prediction models was statistically tested by comparing calculated to predicted SDR values, and a 10% maximum relative error was exhibited. The proposed prediction models were accurate for all practical ranges of span length, aspect ratio and live load in two-way slabs.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89360305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1