Pub Date : 2024-07-19DOI: 10.1007/s11012-024-01855-6
Chu Chen, Xu Zhuo, Li Hui, Xu Pei-yao, Sun Xian-chao, Gu Da-wei, Hu Chang-cheng, Li He, Wen Bang-chun
Theoretical modeling is established for an all-composite honeycomb core sandwich panel (ACHCSP) using the higher-order shear deformation theory and Gibson equivalent theory. The central honeycomb layer is equivalently modeled as a thick layer of orthotropic material. The vibration characteristics are solved using energy methods and orthogonal polynomial approaches. Experimental specimens of ACHCSP are fabricated, and a dedicated experimental setup is constructed for vibration response testing. The experimental results validate the accuracy of the theoretical model in predicting the intrinsic properties and vibration response of ACHCSP. A comparison between experimental and theoretical vibration response values indicates a maximum error of 10.91%. Finally, the impact of different fiber layer thicknesses, honeycomb cell wall thicknesses, and honeycomb cell wall lengths on the vibration characteristics of ACHCSP is discussed.
{"title":"Analysis of vibrational characteristics of all-composite honeycomb core sandwich panels: theoretical and experimental study","authors":"Chu Chen, Xu Zhuo, Li Hui, Xu Pei-yao, Sun Xian-chao, Gu Da-wei, Hu Chang-cheng, Li He, Wen Bang-chun","doi":"10.1007/s11012-024-01855-6","DOIUrl":"10.1007/s11012-024-01855-6","url":null,"abstract":"<div><p>Theoretical modeling is established for an all-composite honeycomb core sandwich panel (ACHCSP) using the higher-order shear deformation theory and Gibson equivalent theory. The central honeycomb layer is equivalently modeled as a thick layer of orthotropic material. The vibration characteristics are solved using energy methods and orthogonal polynomial approaches. Experimental specimens of ACHCSP are fabricated, and a dedicated experimental setup is constructed for vibration response testing. The experimental results validate the accuracy of the theoretical model in predicting the intrinsic properties and vibration response of ACHCSP. A comparison between experimental and theoretical vibration response values indicates a maximum error of 10.91%. Finally, the impact of different fiber layer thicknesses, honeycomb cell wall thicknesses, and honeycomb cell wall lengths on the vibration characteristics of ACHCSP is discussed.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141737779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-19DOI: 10.1007/s11012-024-01853-8
Julia de Castro Motta, Fernando Fraternali, Giuseppe Saccomandi
This study investigates the propagation of rarefaction solitary waves in one-dimensional, tensegrity-like mass-spring lattices that are subject to an initial state of pre-compression. The analyzed systems exhibit a cubic interaction potential between adjacent masses that accurately captures the constitutive response of tensegrity prisms with elastically softening behavior. Analytical results are presented for the propagation of rarefaction solitary waves that produce a reduction of the initial prestress exhibited by the system. It is known in the literature that the use of cubic interaction potentials in one-dimensional lattices enables the prediction of the propagation of solitary waves with sech(^2) profile. Investigating the particular case of pre-compressed, softening-type tensegrity lattices, this study shows that such a noticeable result can be derived using both the classical and the improved Boussinesq equation. The given results reveal the presence of rarefaction solitary waves in a suitable range of wave speeds, and offer an explicit formula for the upper bound of the rarefaction wave speed that leaves the system in a compressed state. The outcomes of the present work pave the way to the development of analytic models for the design of radically new, metamaterial-type impact protection systems. Numerical simulations show the ability of the tensegrity-like model in predicting the propagation of rarefaction solitary waves in a physical model of a tensegrity mass-spring chain.
{"title":"Rarefaction pulses on tensegrity lattices are just $$text {sech}^2$$ -solitary (dark) waves","authors":"Julia de Castro Motta, Fernando Fraternali, Giuseppe Saccomandi","doi":"10.1007/s11012-024-01853-8","DOIUrl":"https://doi.org/10.1007/s11012-024-01853-8","url":null,"abstract":"<p>This study investigates the propagation of rarefaction solitary waves in one-dimensional, tensegrity-like mass-spring lattices that are subject to an initial state of pre-compression. The analyzed systems exhibit a cubic interaction potential between adjacent masses that accurately captures the constitutive response of tensegrity prisms with elastically softening behavior. Analytical results are presented for the propagation of rarefaction solitary waves that produce a reduction of the initial prestress exhibited by the system. It is known in the literature that the use of cubic interaction potentials in one-dimensional lattices enables the prediction of the propagation of solitary waves with sech<span>(^2)</span> profile. Investigating the particular case of pre-compressed, softening-type tensegrity lattices, this study shows that such a noticeable result can be derived using both the classical and the improved Boussinesq equation. The given results reveal the presence of rarefaction solitary waves in a suitable range of wave speeds, and offer an explicit formula for the upper bound of the rarefaction wave speed that leaves the system in a compressed state. The outcomes of the present work pave the way to the development of analytic models for the design of radically new, metamaterial-type impact protection systems. Numerical simulations show the ability of the tensegrity-like model in predicting the propagation of rarefaction solitary waves in a physical model of a tensegrity mass-spring chain.</p>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141745723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Inspired that Kangaroo could buffer the shock and vibration from ground and keep the body and head steady and low/wide-frequency vibration isolation performance, a novel foot-leg coupling bio-inspired vibration isolation (FLBVI) system is proposed considering the synergy among skeleton, ligament/muscle and articulation. Based on the statics model, the static properties are investigated, and the idealized loading capacity and quasi-zero stiffness (QZS) range could be easily obtained by adjusting structure parameters. Combining with the dynamic model, the dynamic equation of the FLBVI structure is derived by Lagrange principle, and the nonlinear properties are analyzed by incremental harmonic balance method (IHBM). Based on verifying validity and feasibility of theoretical model with experiment results, the dynamic behaviors and vibration isolation performances of FLBVI structure are revealed from the visual angle of resonance characteristic and displacement transmissibility under different parameters. The results show that the FLBVI could availably reduce response amplitude, broaden the vibration isolation bandwidth, and then improve vibration isolation performance (below 5 Hz) and stability with proper parameters. The research of the FLBVI structure provides an innovative strategy of the designing bio-inspired vibration isolation structure.
{"title":"Dynamic stability and vibration isolation property of a foot-leg coupling bio-inspired vibration isolation structure","authors":"Shihua Zhou, Pengyang Wang, Yunchao Zhou, Chenhui Zhou, Zichun Zhou, XinHai Yu","doi":"10.1007/s11012-024-01858-3","DOIUrl":"10.1007/s11012-024-01858-3","url":null,"abstract":"<div><p>Inspired that Kangaroo could buffer the shock and vibration from ground and keep the body and head steady and low/wide-frequency vibration isolation performance, a novel foot-leg coupling bio-inspired vibration isolation (FLBVI) system is proposed considering the synergy among skeleton, ligament/muscle and articulation. Based on the statics model, the static properties are investigated, and the idealized loading capacity and quasi-zero stiffness (QZS) range could be easily obtained by adjusting structure parameters. Combining with the dynamic model, the dynamic equation of the FLBVI structure is derived by Lagrange principle, and the nonlinear properties are analyzed by incremental harmonic balance method (IHBM). Based on verifying validity and feasibility of theoretical model with experiment results, the dynamic behaviors and vibration isolation performances of FLBVI structure are revealed from the visual angle of resonance characteristic and displacement transmissibility under different parameters. The results show that the FLBVI could availably reduce response amplitude, broaden the vibration isolation bandwidth, and then improve vibration isolation performance (below 5 Hz) and stability with proper parameters. The research of the FLBVI structure provides an innovative strategy of the designing bio-inspired vibration isolation structure.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141745722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-17DOI: 10.1007/s11012-024-01777-3
M. Di Domenico, I. Carlomagno, A. Sellitto
{"title":"Wave propagation at nano-scale in coupled transport phenomena: application to thermoelectricity","authors":"M. Di Domenico, I. Carlomagno, A. Sellitto","doi":"10.1007/s11012-024-01777-3","DOIUrl":"https://doi.org/10.1007/s11012-024-01777-3","url":null,"abstract":"","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141829180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-17DOI: 10.1007/s11012-024-01761-x
Jiakun Wang, Junyi Liang, Bin Liu, Wenjuan Yao
The complex fluid–solid coupling movement of macro–micro structures and lymphatic fluid in the cochlea plays a crucial role in the mechanism of sound perception in the human ear. However, previous studies have primarily focused on the macrostructure and overlooked the microstructure of the Organ of Corti (OC). In reality, the microstructure of the OC can regulate the vibration of the basilar membrane, which is important for sound perception. To address this, a three-dimensional spiral passive cochlear model containing a complete OC that conforms to the real physiology of the human ear was developed, but the significant amplification of its motion by the action of outer hair cells (OHC) in the living cochlea was not considered. The fluid–solid coupling calculations were conducted on this model, specifically examining the mechanical response of the OC microstructure and the pressure changes in the lymphatic fluid. The results showed that the lower stiffness structure in the OC has a lower stress level, which contributes to the realization of sound perception. As the frequencies increases, the region of peak stress and displacement in the OHC moves from the apex to the base of the cochlea, reflecting frequency-selective characteristics. The tunnel of the OC amplifies pressure waves at specific locations, enabling more accurate frequency recognition. Furthermore, the presence of the OC not only causes significant radial differences in lymphatic fluid pressure in the scala vestibule, but also enhances internal cochlear vibration, playing an undeniable regulatory role in the sound perception.Kindly check and verify edit made in article title.We have checked and verified the editing in the article title.
{"title":"Fluid–solid coupling analysis of the whole spiral organ of Corti","authors":"Jiakun Wang, Junyi Liang, Bin Liu, Wenjuan Yao","doi":"10.1007/s11012-024-01761-x","DOIUrl":"10.1007/s11012-024-01761-x","url":null,"abstract":"<div><p>The complex fluid–solid coupling movement of macro–micro structures and lymphatic fluid in the cochlea plays a crucial role in the mechanism of sound perception in the human ear. However, previous studies have primarily focused on the macrostructure and overlooked the microstructure of the Organ of Corti (OC). In reality, the microstructure of the OC can regulate the vibration of the basilar membrane, which is important for sound perception. To address this, a three-dimensional spiral passive cochlear model containing a complete OC that conforms to the real physiology of the human ear was developed, but the significant amplification of its motion by the action of outer hair cells (OHC) in the living cochlea was not considered. The fluid–solid coupling calculations were conducted on this model, specifically examining the mechanical response of the OC microstructure and the pressure changes in the lymphatic fluid. The results showed that the lower stiffness structure in the OC has a lower stress level, which contributes to the realization of sound perception. As the frequencies increases, the region of peak stress and displacement in the OHC moves from the apex to the base of the cochlea, reflecting frequency-selective characteristics. The tunnel of the OC amplifies pressure waves at specific locations, enabling more accurate frequency recognition. Furthermore, the presence of the OC not only causes significant radial differences in lymphatic fluid pressure in the scala vestibule, but also enhances internal cochlear vibration, playing an undeniable regulatory role in the sound perception.Kindly check and verify edit made in article title.We have checked and verified the editing in the article title.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141829936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-17DOI: 10.1007/s11012-024-01850-x
Cristina Falcinelli, Aurora Angela Pisano, Marcello Vasta, Paolo Fuschi
The paper proposes a refined CT-based FE modelling strategy that implements a limit analysis numerical procedure, namely the Elastic Compensation Method (ECM), to estimate a lower bound to the collapse load of a human femur. In particular, the model geometry was obtained from CT images by segmentation of a fresh-frozen human cadaveric femur that was discretized with second-order tetrahedral 3D finite elements. A yield criterion of Tsai–Wu-type, expressed in principal stress space, was adopted to model the bone tissues for which the strength limit values in tension, compression and shear are computed locally from the femoral density distribution also derived from CT images. The developed CT-based numerical technique showed the ability to predict, at least for the examined femur for which the experimental collapse load is available, a lower bound to the collapse load. The proposed approach seems a promising and effective tool that could be adopted into clinical practice to predict the fracture risk of human femur starting from patient-specific data given by medical imaging.
{"title":"A computed tomography-based limit analysis approach to investigate the mechanical behavior of the human femur prone to fracture","authors":"Cristina Falcinelli, Aurora Angela Pisano, Marcello Vasta, Paolo Fuschi","doi":"10.1007/s11012-024-01850-x","DOIUrl":"10.1007/s11012-024-01850-x","url":null,"abstract":"<div><p>The paper proposes a refined CT-based FE modelling strategy that implements a limit analysis numerical procedure, namely the Elastic Compensation Method (ECM), to estimate a lower bound to the collapse load of a human femur. In particular, the model geometry was obtained from CT images by segmentation of a fresh-frozen human cadaveric femur that was discretized with second-order tetrahedral 3D finite elements. A yield criterion of Tsai–Wu-type, expressed in principal stress space, was adopted to model the bone tissues for which the strength limit values in tension, compression and shear are computed locally from the femoral density distribution also derived from CT images. The developed CT-based numerical technique showed the ability to predict, at least for the examined femur for which the experimental collapse load is available, a lower bound to the collapse load. The proposed approach seems a promising and effective tool that could be adopted into clinical practice to predict the fracture risk of human femur starting from patient-specific data given by medical imaging.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-024-01850-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141829995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-17DOI: 10.1007/s11012-024-01854-7
S. Defanti, M. Giacalone, S. Mantovani, Emanuele Tognoli
{"title":"Dimensional and mechanical assessment of gyroid lattices produced in aluminum by laser powder bed fusion","authors":"S. Defanti, M. Giacalone, S. Mantovani, Emanuele Tognoli","doi":"10.1007/s11012-024-01854-7","DOIUrl":"https://doi.org/10.1007/s11012-024-01854-7","url":null,"abstract":"","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141830905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-17DOI: 10.1007/s11012-024-01771-9
Kenjiro Shimano, Suguru Shiratori, Hideaki Nagano
Measurements of a single flow velocity component are still prevalent due to their reasonable costs and some difficulties in multiple-component measurements. If the transverse component can be obtained additionally by a numerical technique, qualitative features of the flow will be understood more effectively. In this context, methods based on the 2-dimensonal divergence-free assumption have been widely used for problems in which a single velocity component is measured over a planar domain. In this study, the authors proposed a method of approximating the second planar velocity component by minimising an objective function expressed with divergence and vorticity so that the mass transport in the out-of-plane direction could be taken into consideration. The present method was tested with numerically produced 3-dimensional flows in a hexahedral chamber and a flow around a bluff body measured by particle image velocimetry. There was a tendency that the present method calculated the second velocity component with smaller errors than existing divergence-free approaches. It was also shown that the present method had a high capability to locate strong suction and generation caused by the mass transport in the out-of-plane direction. The present method is deemed promising for many one-component flow measurements in engineering and medicine.
{"title":"A novel method of reconstructing planar flow field from given distribution of single velocity component: comparison to conventional divergence-free approach","authors":"Kenjiro Shimano, Suguru Shiratori, Hideaki Nagano","doi":"10.1007/s11012-024-01771-9","DOIUrl":"10.1007/s11012-024-01771-9","url":null,"abstract":"<div><p>Measurements of a single flow velocity component are still prevalent due to their reasonable costs and some difficulties in multiple-component measurements. If the transverse component can be obtained additionally by a numerical technique, qualitative features of the flow will be understood more effectively. In this context, methods based on the 2-dimensonal divergence-free assumption have been widely used for problems in which a single velocity component is measured over a planar domain. In this study, the authors proposed a method of approximating the second planar velocity component by minimising an objective function expressed with divergence and vorticity so that the mass transport in the out-of-plane direction could be taken into consideration. The present method was tested with numerically produced 3-dimensional flows in a hexahedral chamber and a flow around a bluff body measured by particle image velocimetry. There was a tendency that the present method calculated the second velocity component with smaller errors than existing divergence-free approaches. It was also shown that the present method had a high capability to locate strong suction and generation caused by the mass transport in the out-of-plane direction. The present method is deemed promising for many one-component flow measurements in engineering and medicine.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-024-01771-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141830023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-08DOI: 10.1007/s11012-024-01849-4
Ali Kaya, Boudjamaa Roudane, Süleyman Adanur, Fezayil Sunca, Ali Fuat Genç, Murat Gunaydin, Ahmet Can Altunişik
Seismic performance evaluation of masonry structures is of paramount importance for ensuring the safety and resilience of buildings in earthquake-prone regions. There are limited number of studies on pumice elements in the literature. In addition, there are almost no studies investigating the earthquake behavior of pumice masonry building as a whole structure. In this context, a comprehensive understanding of their seismic response and dynamic characteristics has been lacking. To address this knowledge gap, a shake-table experimental campaign was undertaken, wherein half-scale pumice masonry building was exposed to simulated seismic forces. To enhance the experimental findings, numerical simulations were performed to confirm and expand our comprehension of how the pumice masonry structure responds to dynamic forces. Integrating both experimental and numerical outcomes provides a holistic understanding of how pumice masonry buildings behave during seismic events. At the end of the experimental study, the frequency values of the pumice model were observed to decrease up to 23.5% in the modes compared to the undamaged state. In the numerical model, this value decreases up to 19.85%. For the undamaged and damaged model, the first three experimental mode shapes were similar to the numerical mode shapes. Both experimental and numerical results show that the expected damages occur in the same regions. These results show that nonlinear FE models can be helpful in determining potential damage model locations. The findings have implications for the seismic design and retrofitting of similar traditional masonry buildings, facilitating the development of resilient and sustainable engineering solutions in seismic-prone regions.
砌体结构的抗震性能评估对于确保地震多发地区建筑物的安全和抗震能力至关重要。文献中关于浮石构件的研究数量有限。此外,将浮石砌体建筑作为一个整体结构来研究其地震行为的研究几乎为零。在这种情况下,对其地震响应和动态特性缺乏全面的了解。针对这一知识空白,我们开展了一项振动台实验活动,将半比例浮石砌体建筑暴露在模拟地震力下。为了加强实验结果,还进行了数值模拟,以确认和扩展我们对浮石砌体结构如何对动态力做出反应的理解。综合实验和数值结果,我们可以全面了解浮石砌体建筑在地震事件中的表现。实验研究结束时,观察到浮石模型的频率值与未损坏状态相比降低了 23.5%。在数值模型中,这一数值降低了 19.85%。对于未损坏和损坏模型,前三个实验模态振型与数值模态振型相似。实验和数值结果都表明,预期的损坏发生在相同的区域。这些结果表明,非线性 FE 模型有助于确定潜在的破坏模型位置。这些研究结果对类似传统砌体建筑的抗震设计和改造具有借鉴意义,有助于在地震多发地区开发具有抗震能力的可持续工程解决方案。
{"title":"Structural response of half-scale pumice concrete masonry building: shake table/ambient vibration tests and FE analysis","authors":"Ali Kaya, Boudjamaa Roudane, Süleyman Adanur, Fezayil Sunca, Ali Fuat Genç, Murat Gunaydin, Ahmet Can Altunişik","doi":"10.1007/s11012-024-01849-4","DOIUrl":"10.1007/s11012-024-01849-4","url":null,"abstract":"<div><p>Seismic performance evaluation of masonry structures is of paramount importance for ensuring the safety and resilience of buildings in earthquake-prone regions. There are limited number of studies on pumice elements in the literature. In addition, there are almost no studies investigating the earthquake behavior of pumice masonry building as a whole structure. In this context, a comprehensive understanding of their seismic response and dynamic characteristics has been lacking. To address this knowledge gap, a shake-table experimental campaign was undertaken, wherein half-scale pumice masonry building was exposed to simulated seismic forces. To enhance the experimental findings, numerical simulations were performed to confirm and expand our comprehension of how the pumice masonry structure responds to dynamic forces. Integrating both experimental and numerical outcomes provides a holistic understanding of how pumice masonry buildings behave during seismic events. At the end of the experimental study, the frequency values of the pumice model were observed to decrease up to 23.5% in the modes compared to the undamaged state. In the numerical model, this value decreases up to 19.85%. For the undamaged and damaged model, the first three experimental mode shapes were similar to the numerical mode shapes. Both experimental and numerical results show that the expected damages occur in the same regions. These results show that nonlinear FE models can be helpful in determining potential damage model locations. The findings have implications for the seismic design and retrofitting of similar traditional masonry buildings, facilitating the development of resilient and sustainable engineering solutions in seismic-prone regions.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-024-01849-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-07DOI: 10.1007/s11012-024-01834-x
Chiara Masnata, Antonina Pirrotta
This paper presents the optimal design of improved inerter-based absorbers to effectively mitigate vibrations in structural systems. The improvement of the inerter is achieved by integrating it within a rhombus truss, composed of rigid rods interconnected by hinges. This arrangement exploits the geometrical amplification effect to enhance inertial properties, thus leading to superior control performance. Specifically, both ends of the inerter are anchored to opposite points along one diagonal of the rhombus, while along the other diagonal, one end is grounded, and the other is linked to the structural system itself or other mechanical systems. The motion of these systems triggers the activation of the inerter, contributing to vibration dissipation. Previous studies have combined this improved inerter with a spring-dashpot unit proposing the so-called Improved Tuned Inerter Damper (ITID). Extending prior research, this study integrates the improved inerter with common passive control devices, such as the Tuned Liquid Column Damper (TLCD) and Tuned Mass Damper (TMD), resulting in the development of the novel Improved Tuned Liquid Column Damper Inerters (ITLCDI) and Improved Tuned Mass Damper Inerter (ITMDI). The optimal calibration for the ITLCDI through an analytical approach is presented, assuming stochastic processes for modeling seismic actions. Furthermore, it discusses how the ITLCDI configuration can be adapted to yield the ITMDI and ITID configurations, providing closed-form solutions for all three absorbers. Validation of the proposed method is performed through numerical simulations, with a thorough analysis conducted to assess the effectiveness of the ITLCDI relative to the ITMDI and ITID configurations.
{"title":"Optimal design of inerter-based absorbers with amplified inertance: from the improved tuned liquid column damper inerter (ITLCDI) to the improved tuned mass damper inerter (ITMDI) and improved tuned inerter damper (ITID)","authors":"Chiara Masnata, Antonina Pirrotta","doi":"10.1007/s11012-024-01834-x","DOIUrl":"https://doi.org/10.1007/s11012-024-01834-x","url":null,"abstract":"<p>This paper presents the optimal design of improved inerter-based absorbers to effectively mitigate vibrations in structural systems. The improvement of the inerter is achieved by integrating it within a rhombus truss, composed of rigid rods interconnected by hinges. This arrangement exploits the geometrical amplification effect to enhance inertial properties, thus leading to superior control performance. Specifically, both ends of the inerter are anchored to opposite points along one diagonal of the rhombus, while along the other diagonal, one end is grounded, and the other is linked to the structural system itself or other mechanical systems. The motion of these systems triggers the activation of the inerter, contributing to vibration dissipation. Previous studies have combined this improved inerter with a spring-dashpot unit proposing the so-called Improved Tuned Inerter Damper (ITID). Extending prior research, this study integrates the improved inerter with common passive control devices, such as the Tuned Liquid Column Damper (TLCD) and Tuned Mass Damper (TMD), resulting in the development of the novel Improved Tuned Liquid Column Damper Inerters (ITLCDI) and Improved Tuned Mass Damper Inerter (ITMDI). The optimal calibration for the ITLCDI through an analytical approach is presented, assuming stochastic processes for modeling seismic actions. Furthermore, it discusses how the ITLCDI configuration can be adapted to yield the ITMDI and ITID configurations, providing closed-form solutions for all three absorbers. Validation of the proposed method is performed through numerical simulations, with a thorough analysis conducted to assess the effectiveness of the ITLCDI relative to the ITMDI and ITID configurations.</p>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141546364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}