High Performance and Optimum Design of Structures and Materials III最新文献_第2页

EXPERIMENTAL STUDY OF TIMBER–TIMBER COMPOSITE MEMBERS 木材-木材复合构件试验研究

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180091

F. Nouri, M. Bradford, H. Valipour

{"title":"EXPERIMENTAL STUDY OF TIMBER–TIMBER COMPOSITE MEMBERS","authors":"F. Nouri, M. Bradford, H. Valipour","doi":"10.2495/HPSM180091","DOIUrl":"https://doi.org/10.2495/HPSM180091","url":null,"abstract":"Timber is a sustainable construction material having a higher strength to density ratio, lower embodied energy and a lower carbon footprint when compared with conventional construction materials such as steel and concrete. Furthermore, the advent of engineered wood products including glued laminated timber (Glulam), cross laminated timber (CLT) and laminated veneer lumber (LVL) with improved mechanical properties and dimensional stability has provided the opportunity to construct multi-storey timber buildings with robustness and reliability comparable to steel and reinforced concrete structures, but with far less environmental intrusion. This paper investigates the behaviour of CLT panels connected to LVL and/or Glulam timber joists by coach screws, creating a timber–timber composite (TTC) member. The load-slip behaviour and failure modes of the CLT–LVL and CLT–Glulam composite members are characterised by conducting push-out tests and the effect of the CLT lamellae orientation, screw size and inclination and the edge distance in conjunction with the type of timber joist (LVL, softwood/hardwood Glulam) on the structural behaviour of the TTC members are investigated. Finally, an empirical model for the load-slip response of the TTC members with dowel connections is developed and calibrated from non-linear regression of the push-out test data.","PeriodicalId":340058,"journal":{"name":"High Performance and Optimum Design of Structures and Materials III","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124937650","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: 3

A NEW APPROACH FOR THE PREDICTION OF TRAFFIC-INDUCED GROUND VIBRATION USING A HYBRID OPTIMIZED ANFIS-BASED MODEL 基于混合优化模型的交通诱发地面振动预测新方法

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180201

S. Lubej, A. Ivanič

引用次数: 1

CREEP RUPTURE LIFE AND INTERLAMINAR SHEAR STRENGTH OF WATER-ABSORBED GREEN COMPOSITE WITH PLAIN WOVEN NATURAL FIBER CLOTH 天然纤维平纹织物吸水绿色复合材料的蠕变断裂寿命和层间剪切强度

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180061

H. Katogi, K. Takemura, Atsuhiro Hayamori

{"title":"CREEP RUPTURE LIFE AND INTERLAMINAR SHEAR STRENGTH OF WATER-ABSORBED GREEN COMPOSITE WITH PLAIN WOVEN NATURAL FIBER CLOTH","authors":"H. Katogi, K. Takemura, Atsuhiro Hayamori","doi":"10.2495/HPSM180061","DOIUrl":"https://doi.org/10.2495/HPSM180061","url":null,"abstract":"To ensure safety of electric vehicles using green composites, this study examined the interlaminar shear strength, creep rupture strength, and useful life of plain woven jute fiber cloth reinforced polylactic acid after water immersion. The fiber volume fraction of the green composite was 40%. Water absorption tests were conducted of the green composite comprising jute fiber and polylactic acid (PLA). Tensile creep tests of green composite and jute fiber were conducted after water immersion. The maximum stress was 60–90% of tensile strength. The environmental temperature was room temperature. Short beam testing of double-notched green composite was also conducted after water immersion. Results show the following. When water absorption tests were conducted, the water absorption rates of green composite, jute fiber and PLA at 24 hr were 9%, 3.4% and 0.3%, respectively. The creep rupture strength of 9% water absorbed green composite was lower than that of non-water-absorbed (non-absorbed) green composite. However, the creep rupture strength of 3.4% water absorbed jute fiber was slightly higher than that of non-absorbed jute fiber. For maximum stress of 40 MPa, the creep rupture life of 9% water absorbed green composite was much shorter than that of the non-absorbed green composite. Interlaminar shear strength of 9% water absorbed green composite was lower by 11% than that of the non-absorbed green composite. Water penetrated to the fiber–resin interface when water absorption test of green composite was conducted until 24 hr. Therefore, the interlaminar shear strength, creep rupture life, and green composite strength were decreased mainly because of the decrease of fiber–resin interfacial adhesion as a result of water penetration.","PeriodicalId":340058,"journal":{"name":"High Performance and Optimum Design of Structures and Materials III","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128786857","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

EXPERIENCES ON STRUCTURAL OPTIMIZATION UNDER UNCERTAINTY IN AEROSPACE COMPONENTS 航空航天部件不确定条件下结构优化研究

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180121

A. Baldomir, S. Hernández, C. López, C. Cid

引用次数: 0

ECONOMICALLY OPTIMUM STRUCTURAL DESIGN: METHODOLOGY AND CASE STUDY 经济上最优的结构设计:方法和案例研究

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180151

M. Holicky, D. Diamantidis, M. Sýkora

引用次数: 0

DETERMINING OPTIMAL DESIGNS OF TIMBER BEAMS WITH NON-UNIFORM CROSS-SECTION 非均匀截面木梁优化设计的确定

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180171

P. Jelušič

引用次数: 4

SUSTAINABLE SYNTHESIS AND OPTIMIZATION OF ENGINEERING SYSTEMS 工程系统的可持续综合与优化

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180191

M. Bogataj, L. Čuček, T. Zula, S. Kravanja, Z. Kravanja

{"title":"SUSTAINABLE SYNTHESIS AND OPTIMIZATION OF ENGINEERING SYSTEMS","authors":"M. Bogataj, L. Čuček, T. Zula, S. Kravanja, Z. Kravanja","doi":"10.2495/HPSM180191","DOIUrl":"https://doi.org/10.2495/HPSM180191","url":null,"abstract":"The solutions to engineering systems should not only be feasible but should also be beneficial to all the pillars of sustainable development (economic, environmental and social) to the greatest possible extent. However, due to the inherent trade-offs among the three components of sustainable development, identifying such solutions is not a straightforward task. In this manuscript, we present a simultaneous approach for sustainable synthesis and optimization of engineering systems based on a mixed-integer (non)linear programming MI(N)LP. The approach aims at providing sustainable solutions and an insight into the trade-offs among the economic, environmental and social component of sustainable development. Maximization of a sustainability profit, which is a composite criterion comprised of economic, ecoand social profits, is applied in order to obtain the optimal sustainable solutions. The solutions are compared to those obtained by maximizing either pure economic profit or minimizing Green House Gas emissions. The approach is tested on two case studies and the results are compared. The first example is a simple example from the field of civil engineering. The example presents the synthesis/optimization of a 5.5 meters long cantilever beams. The second example represents supply chain synthesis/optimisation of a biogas production plant in Slovenia. The results for the first case study indicate that 23% increase in sustainability profit causes slight decrease in economic profit (6%). On the other hand, the results for the second case study indicate that a slight increase in sustainability profit (6%) causes a 27% decrease in economic profit. Nevertheless, the solutions obtained by maximizing the sustainability profit remain economically viable due to its composite nature that properly captures and reflects the trade-offs.","PeriodicalId":340058,"journal":{"name":"High Performance and Optimum Design of Structures and Materials III","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116097068","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: 3

EFFECT OF RIB ROOT SHAPE ON THE TENSILE STRENGTH OF PRESS AND INJECTION HYBRID MOLDED PRODUCTS MADE WITH CF/PA6 RANDOM PREPREG SHEET 肋根形状对cf / pa6随机预浸板压注复合成型制品抗拉强度的影响

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180101

Kazuto Tanaka, M. Kaetsu, T. Katayama, T. Ishikawa

{"title":"EFFECT OF RIB ROOT SHAPE ON THE TENSILE STRENGTH OF PRESS AND INJECTION HYBRID MOLDED PRODUCTS MADE WITH CF/PA6 RANDOM PREPREG SHEET","authors":"Kazuto Tanaka, M. Kaetsu, T. Katayama, T. Ishikawa","doi":"10.2495/HPSM180101","DOIUrl":"https://doi.org/10.2495/HPSM180101","url":null,"abstract":"The use of carbon fiber reinforced thermoplastic (CFRTP) contributes to weight reduction of automobiles and offers better gasoline mileage. Recently, to mold CFRTP with high-strength and highstiffness for complex shaped products with ribs and bosses, the hybrid molding system has been developed by combining press molding and injection molding. Although rib root shape is the important factor in the press and injection hybrid molding, the effect of rib root shape on the rib root strength has not been clarified yet. In this study, carbon fiber reinforced polyamide 6 composites were molded by press and injection hybrid molding. Rib root tensile test of T-shaped specimen cut out from the hybrid molded products and in-plain tensile test of the outer shell laminate were conducted to clarify the effect of rib root shape (radius of curvature R = 0 and 2.5). For rib root tensile test of T-shaped specimens, higher strength was obtained in the molded products with R = 0 than those with R = 2.5. On the other hand, in the case of in-plain tensile strength of outer shell laminate, higher tensile strength was obtained in the molded products with R = 2.5 than those with R = 0.","PeriodicalId":340058,"journal":{"name":"High Performance and Optimum Design of Structures and Materials III","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127170264","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

TOWARDS OPTIMUM DESIGN FOR CRACK WIDTH LIMIT STATES: THE NEED FOR FURTHER DEVELOPMENTS 裂缝宽度极限状态的优化设计:需要进一步发展

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180141

M. Sýkora, M. Holicky, J. Marková

{"title":"TOWARDS OPTIMUM DESIGN FOR CRACK WIDTH LIMIT STATES: THE NEED FOR FURTHER DEVELOPMENTS","authors":"M. Sýkora, M. Holicky, J. Marková","doi":"10.2495/HPSM180141","DOIUrl":"https://doi.org/10.2495/HPSM180141","url":null,"abstract":"Serviceability limit states including cracking are of increasing importance and often dominate the design of reinforced concrete structures. Furthermore, actual crack widths and their shape play an important role in the assessment of service life of existing reinforced concrete structures. Crack width is inherently a random variable of considerable scatter due to randomness of material properties, geometry of the structure, loading and model uncertainty in crack width estimates. The state-of-the-art concepts for serviceability verifications were recently presented in fib Model Code 2010 that is jointly with Eurocode EN 1992-1-1 considered as key background materials in this study. To assess the sufficiency of code requirements and design procedures, crack widths of water retaining structures are investigated in detail using probabilistic methods of structural reliability. The current codes seem to be well calibrated to reach a target reliability index of 1.5 in the serviceability limit states. The two variables dominating structural reliability are uncertainty in crack width model and concrete cover. Numerous topics need to be further investigated including revision of crack width limits, improvements of mechanical models, quantification of model uncertainty, methodology for load combinations, treatment of spatial variability for large structures, and optimisation of target reliabilities.","PeriodicalId":340058,"journal":{"name":"High Performance and Optimum Design of Structures and Materials III","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126833544","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

A 2.1 GPA TRIPLE-PHASE SPRING STEEL 2.1 gpa三相弹簧钢

High Performance and Optimum Design of Structures and Materials III Pub Date : 2018-07-11 DOI: 10.2495/HPSM180011

Liang Zhongyang, W. Zhou, Xuan Wang, D. Northwood, Cheng Liu

{"title":"A 2.1 GPA TRIPLE-PHASE SPRING STEEL","authors":"Liang Zhongyang, W. Zhou, Xuan Wang, D. Northwood, Cheng Liu","doi":"10.2495/HPSM180011","DOIUrl":"https://doi.org/10.2495/HPSM180011","url":null,"abstract":"The key way of achieving sustainability of a product is to design a manufacturing process that increases the mechanical properties of traditional materials, e.g. steel, whilst also increasing processing efficiency, and diminishing energy consumption. A novel process has been developed that allows for a traditional spring steel (60Si2Mn) to be produced with a high level of strength (tensile strength is over 2100 MPa, bending strength is 4100 MPa, yield strength is 1700 MPa as well as hardness of 59 HRC), also retaining reasonable ductility on an industrial scale. It is shown that a triple-phase microstructure comprising lenticular prior martensite, nano-scaled needle/lath-like bainitic ferrite and film retained austenite, is obtained. The excellent combination of strength and ductility is attributed to a synergistic multi-phase strengthening effect. The nano-scaled structure exhibits a good balance between strength and toughness. The presence of prior martensite provides the kinetics of subsequent nano-scaled bainitic transformation by bainitic laths nucleating at the martensite–austenite interfaces. This design methodology potentially broadens the application of spring steel to components that experience more demanding service environments, such as heavy loads.","PeriodicalId":340058,"journal":{"name":"High Performance and Optimum Design of Structures and Materials III","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133964465","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