Engineering Journal最新文献

Torsional Design of Round HSS Members— A Critical Review 圆形高速钢构件的扭转设计--批判性评述

Engineering Journal Pub Date : 2024-07-01 DOI: 10.62913/engj.v61i3.1329

Bo Dowswell

引用次数: 0

Tensile Coupon Testing and Residual Stress Measurements of High-Strength Steel Built-Up I-Shaped Sections 高强度钢内置 I 形截面的拉伸试样测试和残余应力测量

Engineering Journal Pub Date : 2024-07-01 DOI: 10.62913/engj.v61i3.1326

Kara Stall, Andrea Culhane, Likun Sun, Rachel Chicchi Cross, Matthew Steiner

{"title":"Tensile Coupon Testing and Residual Stress Measurements of High-Strength Steel Built-Up I-Shaped Sections","authors":"Kara Stall, Andrea Culhane, Likun Sun, Rachel Chicchi Cross, Matthew Steiner","doi":"10.62913/engj.v61i3.1326","DOIUrl":"https://doi.org/10.62913/engj.v61i3.1326","url":null,"abstract":"High strength structural steels (with yield stresses greater than 65 ksi) may have notably different material characteristics when compared to structural steels conventionally used in building construction [i.e., ASTM A992/A992M (2022) or A572/A572M Gr. 50 (2021)]. This paper presents findings from an experimental program that investigated the material characterization of ASTM A656/A656M Gr. 80 (2024) plate steel. The results obtained were compared to conventional ASTM A572/A572M Gr. 50 steel. Two types of testing were performed for this work: tensile coupon testing and residual stress testing. The tensile coupon testing was carried out for both the A656/A656M Gr. 80 and A572/A572M Gr. 50 plate material. The A656/A656M Gr. 80 plate material showed more variation between the two different plate thicknesses in both mechanical behavior and microstructure due to differences in steel production. The 0.375 in. thick plate exhibited a clear yield plateau with an ultimate/yield stress ratio similar to the Gr. 50 material. In contrast, the 0.5 in. plate did not have a yield plateau and reached lower ultimate strain. The residual stress testing was performed using a sectioning technique for one A572/A572M Gr. 50 and five A656/A656M Gr. 80 built-up sections that were fabricated from 0.5 in. and 0.375 in. plate material. Residual stresses obtained from measurements were compared to previously published predictive models. The ECCS model and BSK99 models were found to be reasonable predictors of residual stresses for all specimens except the one section fabricated from 0.5 in. thick Gr. 80 plate. When comparing the Gr. 50 and Gr. 80 specimens of the same cross-sectional geometry, the residual stresses were similar, implying that cross-sectional geometry is more prevalent than the nominal yield stress in determining residual stresses in built-up I-sections.","PeriodicalId":11618,"journal":{"name":"Engineering Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141689183","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

Lateral-Torsional Buckling Modification Factors in Steel I-Shaped Members: Recommendations Using Energy-Based Formulations 钢 I 型构件的侧扭屈曲修正系数：使用基于能量的公式的建议

Engineering Journal Pub Date : 2024-07-01 DOI: 10.62913/engj.v61i3.1328

Namita Nayak, P.M. Anilkumar, L. Subramanian

{"title":"Lateral-Torsional Buckling Modification Factors in Steel I-Shaped Members: Recommendations Using Energy-Based Formulations","authors":"Namita Nayak, P.M. Anilkumar, L. Subramanian","doi":"10.62913/engj.v61i3.1328","DOIUrl":"https://doi.org/10.62913/engj.v61i3.1328","url":null,"abstract":"Lateral torsional buckling (LTB) is of concern in long-span flexural members, particularly in the negative flexure regions of continuous-span, steel I-shaped members and during construction. While the elastic critical LTB capacity of a simply supported I-shaped member subjected to uniform moment has a closed-form solution, most LTB modification factors for beams subjected to moment gradients in the literature are empirical and work well only for specific loading and boundary conditions. This paper investigates the suitability of the different LTB modification factors in literature and design specifications for various loading and boundary conditions, accomplished via comparisons with analytical solutions using the Rayleigh-Ritz method and numerical solutions from finite element analyses. The analytical LTB modification factors are derived for doubly symmetric I-shaped members with different combinations of ideal flexural and torsional boundary conditions (simply supported and fixed) and subjected to different loading scenarios. The validity of the LTB modification factors determined using the Rayleigh-Ritz method and other formulae in the literature are also assessed for realistic intermediate restraint conditions, which are neither fully pinned nor fixed, by examining laterally continuous beams. Demonstrating that current design specifications for elastic critical LTB modifications are overly conservative","PeriodicalId":11618,"journal":{"name":"Engineering Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141696688","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

Steel Structures Research Update: Innovative Steel Deck System for Highway Bridge Applications 钢结构研究最新进展：用于公路桥梁的创新型钢桥面系统

Engineering Journal Pub Date : 2024-04-01 DOI: 10.62913/engj.v61i2.1325

Judy Liu

引用次数: 0

Lateral Force Distributions in Braced-Moment Frames 支撑-力矩框架中的侧向力分布

Engineering Journal Pub Date : 2024-04-01 DOI: 10.62913/engj.v61i2.1322

Ralph M. Richard, Eric Keldrauk, Jay Allen

引用次数: 0

Investigation of Steel Plate Washer Thickness for Column Anchor Rod Applications 柱锚杆应用中钢板垫圈厚度的研究

Engineering Journal Pub Date : 2024-04-01 DOI: 10.62913/engj.v61i2.1324

Paul A. Cozzens, Gian Adrea Rassati, James A. Swanson, Thomas M. Burns

{"title":"Investigation of Steel Plate Washer Thickness for Column Anchor Rod Applications","authors":"Paul A. Cozzens, Gian Adrea Rassati, James A. Swanson, Thomas M. Burns","doi":"10.62913/engj.v61i2.1324","DOIUrl":"https://doi.org/10.62913/engj.v61i2.1324","url":null,"abstract":"Since the 13th edition, the AISC Steel Construction Manual has included provisions regarding the recommended minimum plate washer thickness used in a column base plate and anchor rod assembly. Each plate washer must have sufficient strength and stiffness to fully develop the anchor rod to which it is fastened without succumbing to pull-through, flexural, or cracking failure. Laboratory tensile testing of an anchor rod, nut, and plate washer assembly was conducted at the University of Cincinnati to study plate washer performance. This testing investigated the capacity of ASTM A572/A572M Grade 50 plate washers using the recommended minimum thicknesses as listed in Table 14-2 of the 15th edition of the AISC Steel Construction Manual, with anchor rods having ¾, 1, 1½, 2, and 2½ in. diameter. A total of 94 tests were conducted, after which the plate washers were visually assessed for signs of failure, including measurement of permanent out-of-plane deformation. This assessment established that a 40% relative deformation in plate washers could reasonably be judged as a failure threshold due to excessive deformation. Testing and assessment revealed that while 10 plate washers exhibited relative deformations in excess of 40%, the recommended minimum plate washer thicknesses found in AISC Manual Table 14-2 were sufficient in fully developing most anchor rods. The notable exception to the current minimum thickness recommendations were for washers in use with anchor rods with diameters of ¾, 1, and 1½ in. made from Grade 105 steel. For these anchor rods, a thicker plate washer than that currently specified is recommended. Testing also found that the anchor rod orientation and the variations of ultimate strength in individual anchor rods did not appear to be significantly associated with the performance of plate washers in these tests.","PeriodicalId":11618,"journal":{"name":"Engineering Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140784418","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

The Adoption of AISC 360 for Offshore Structural Design Practices 采用 AISC 360 进行海上结构设计实践

Engineering Journal Pub Date : 2024-04-01 DOI: 10.62913/engj.v61i2.1323

Albert Ku, Farrel Zwerneman, Steve Gunzelman, Jieyan Chen

{"title":"The Adoption of AISC 360 for Offshore Structural Design Practices","authors":"Albert Ku, Farrel Zwerneman, Steve Gunzelman, Jieyan Chen","doi":"10.62913/engj.v61i2.1323","DOIUrl":"https://doi.org/10.62913/engj.v61i2.1323","url":null,"abstract":"The offshore design standards for U.S. practices refer to AISC specifications when designing structural components with nontubular shapes. The widely used API RP-2A WSD standard (API, 2014) asks designers to use the 1989 AISC Specification. The newly published API RP-2A LRFD and RP-2TOP ask designers to use the 2010 AISC Specification. Although the 2010 AISC Specification has been partially adopted by API, the current offshore practice is still primarily dominated by the 1989 AISC Specification. The key issue hampering the offshore community’s full adoption of the 2010 AISC Specification is the relative ease of accounting for second-order effects in the 1989 AISC Specification. In 2019, API formed a Task Group dedicated to studying this issue, with the main findings summarized in this paper. By illustrating the key code check process in two examples with an easy-to-understand format, this paper aims to assist offshore structural engineers to better understand the latest AISC specification. The authors also hope that this paper will serve as a communication path between the offshore structural community and AISC for current and future standards’ adoption and harmonization.","PeriodicalId":11618,"journal":{"name":"Engineering Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140764272","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

Enhancing Infrastructure Safety: A UAV-Based Approach for Crack Detection 加强基础设施安全：基于无人机的裂缝检测方法

Engineering Journal Pub Date : 2023-12-31 DOI: 10.4186/ej.2023.27.12.11

Bandla Pavan Babu, Sarah Khandagale, Vedashree Shinde, Saurach Gargote, Kishore Bingi

引用次数: 0

Accuracy Verification of a Smartphone-Based PPK GNSS Surveying Technique and Earth Volume Determinations 基于智能手机的 PPK 全球导航卫星系统测量技术和地球体积测定的精度验证

Engineering Journal Pub Date : 2023-12-31 DOI: 10.4186/ej.2023.27.12.1

Nantapong Tantrakul, Thayathip Thongtan, Hung Kyu Lee, C. Satirapod

引用次数: 0

Note on Fourier Transform of Hidden Variable Fractal Interpolation 隐变量分形插值的傅立叶变换说明

Engineering Journal Pub Date : 2023-12-31 DOI: 10.4186/ej.2023.27.12.23

A. Agathiyan, A. Gowrisankar, Pankajam Natarajan, Kishore Bingi, N. Shaik

引用次数: 0