Pub Date : 2024-02-13DOI: 10.1142/s1793431123500409
Kishor Timsina, Nikshan Amatya, Chaitanya K. Gadagamma, Kimiro Meguro
This research provides a practical and feasible retrofitting solution for soft story in reinforced concrete (RC) buildings with masonry infill walls for example in Nepal through numerical analysis. It is well understood that stiffness and strength of the soft story floor can be increased significantly by adding RC shear wall in the frame opening of the ground floor, making lateral deformation of that floor negligible. With this consideration, the authors have developed a numerical optimization framework for optimizing the RC shear wall in the open floor of soft story building incorporating socio-technical aspects from their previous publication [Timsina, K., Gadagamma, C. K., Numada, M. and Meguro, K. [2019b] “Development of a numerical optimization framework for solving soft-story problem in reinforced concrete frame buildings,” Seisan-Kenkyu]. The objective function for numerical optimization is cost minimization with the constraints of usability, performance, and complexity from a detailed field study. In this paper, the numerical optimization framework is developed and solved using the sequential quadratic programing (SQP). The whole scheme has been incorporated inside the 2D-Applied Element Method (AEM). The retrofitting solution thus obtained from the numerical optimization has been analyzed using the incremental dynamic analysis to know the capacity of the frame structure in earthquake ground motion. It shows that the retrofitting method can significantly enhance the soft story frame’s capacity and ensure the dwellers’ interests are not compromised.
本研究通过数值分析，为尼泊尔等国采用砌体填充墙的钢筋混凝土（RC）建筑的软弱楼层提供了切实可行的改造方案。众所周知，通过在底层框架开口处增加钢筋混凝土剪力墙，可以显著提高软弱楼层的刚度和强度，使该楼层的侧向变形可以忽略不计。考虑到这一点，作者开发了一个数值优化框架，用于优化软弱楼层建筑开敞楼层中的 RC 剪力墙，该框架结合了他们之前发表的社会技术方面的内容[Timsina, K., Gadagamma, C. K., Numada, M. and Meguro, K. [2019b] "Development of a numerical optimization framework for solving soft-story problem in reinforced concrete frame buildings," Seisan-Kenkyu]。数值优化的目标函数是成本最小化，并通过详细的实地研究确定了可用性、性能和复杂性等约束条件。本文开发了数值优化框架，并使用顺序二次编程（SQP）进行求解。整个方案已纳入二维应用元素法（AEM）。通过增量动态分析，对数值优化得到的改造方案进行了分析，以了解框架结构在地震地面运动中的承载能力。结果表明，改造方法可以显著提高软弱楼层框架的承载能力，并确保居住者的利益不受损害。
{"title":"Retrofitting Solution for Soft Story Mitigation in Reinforced Concrete Frame Buildings: A Socio-technical Approach Using Numerical Optimization","authors":"Kishor Timsina, Nikshan Amatya, Chaitanya K. Gadagamma, Kimiro Meguro","doi":"10.1142/s1793431123500409","DOIUrl":"https://doi.org/10.1142/s1793431123500409","url":null,"abstract":"<p>This research provides a practical and feasible retrofitting solution for soft story in reinforced concrete (RC) buildings with masonry infill walls for example in Nepal through numerical analysis. It is well understood that stiffness and strength of the soft story floor can be increased significantly by adding RC shear wall in the frame opening of the ground floor, making lateral deformation of that floor negligible. With this consideration, the authors have developed a numerical optimization framework for optimizing the RC shear wall in the open floor of soft story building incorporating socio-technical aspects from their previous publication [Timsina, K., Gadagamma, C. K., Numada, M. and Meguro, K. [2019b] “Development of a numerical optimization framework for solving soft-story problem in reinforced concrete frame buildings,” <i>Seisan-Kenkyu</i>]. The objective function for numerical optimization is cost minimization with the constraints of usability, performance, and complexity from a detailed field study. In this paper, the numerical optimization framework is developed and solved using the sequential quadratic programing (SQP). The whole scheme has been incorporated inside the 2D-Applied Element Method (AEM). The retrofitting solution thus obtained from the numerical optimization has been analyzed using the incremental dynamic analysis to know the capacity of the frame structure in earthquake ground motion. It shows that the retrofitting method can significantly enhance the soft story frame’s capacity and ensure the dwellers’ interests are not compromised.</p>","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":"68 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140147825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper studies the damage spectra of single-degree-of-freedom (SDOF) systems for tsunami loading. The 2011 Tohoku tsunami wave traces are computed and obtained by adopting the Cornell Multi-grid Coupled Tsunami (COMCOT) model and are further verified by the Tohoku Tsunami Joint Survey (TTJS) data. The tsunami response analyses of SDOF systems are conducted taking into account the dynamic analysis method. The classical ductility damage is considered as the damage performance. The damage spectra are computed for five force reduction factors and 791 tsunami loadings. The effects of inundation depths, hysteretic model, post-yield stiffness ratio, , viscous damping ratio, , are explored and interpreted scientifically and statistically. The results demonstrate that the effect of the hysteretic model, force reduction factor, R, post-yield stiffness ratio, , viscous damping ratio, , on the damage of the structure is evident. Comparison with the static method and influence analysis of structural damping indicate the necessity for the application of the dynamic method. A simplified predictive formulation is developed for the evaluation of structural damage for tsunami loadings.
{"title":"Damage Spectra of SDOF Structures Under Tsunami Actions Considering the Nonlinear Dynamic Analysis Method","authors":"Xiaolan Pan, Zhongyao Lin, Lianpeng Zhang, Zhi Zheng","doi":"10.1142/s1793431123500343","DOIUrl":"https://doi.org/10.1142/s1793431123500343","url":null,"abstract":"<p>This paper studies the damage spectra of single-degree-of-freedom (SDOF) systems for tsunami loading. The 2011 Tohoku tsunami wave traces are computed and obtained by adopting the Cornell Multi-grid Coupled Tsunami (COMCOT) model and are further verified by the Tohoku Tsunami Joint Survey (TTJS) data. The tsunami response analyses of SDOF systems are conducted taking into account the dynamic analysis method. The classical ductility damage is considered as the damage performance. The damage spectra are computed for five force reduction factors and 791 tsunami loadings. The effects of inundation depths, hysteretic model, post-yield stiffness ratio, <span><math altimg=\"eq-00001.gif\" display=\"inline\" overflow=\"scroll\"><mi>α</mi></math></span><span></span>, viscous damping ratio, <span><math altimg=\"eq-00002.gif\" display=\"inline\" overflow=\"scroll\"><mi>ξ</mi></math></span><span></span>, are explored and interpreted scientifically and statistically. The results demonstrate that the effect of the hysteretic model, force reduction factor, <i>R</i>, post-yield stiffness ratio, <span><math altimg=\"eq-00003.gif\" display=\"inline\" overflow=\"scroll\"><mi>α</mi></math></span><span></span>, viscous damping ratio, <span><math altimg=\"eq-00004.gif\" display=\"inline\" overflow=\"scroll\"><mi>ξ</mi></math></span><span></span>, on the damage of the structure is evident. Comparison with the static method and influence analysis of structural damping indicate the necessity for the application of the dynamic method. A simplified predictive formulation is developed for the evaluation of structural damage for tsunami loadings.</p>","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":"108 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140147822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-12-29DOI: 10.1142/s1793431123500380
Jie-Min Wang, Yuanyuan Liang, Zhe Wu, Ju Pu, Yonghong Li, P. Ma, Fengji Wang, Haitao Yin
{"title":"Quasi-real-time inversion of large earthquake rupture process based on Earthquake Early Warning System in China: Applications to 2017 MW 6.5 Jiuzhaigou and 2022 MW 6.7 Menyuan earthquakes","authors":"Jie-Min Wang, Yuanyuan Liang, Zhe Wu, Ju Pu, Yonghong Li, P. Ma, Fengji Wang, Haitao Yin","doi":"10.1142/s1793431123500380","DOIUrl":"https://doi.org/10.1142/s1793431123500380","url":null,"abstract":"","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":"11 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139147668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-12-29DOI: 10.1142/s1793431123500410
Guohuan Liu, Xinyang Li
{"title":"Theoretically derived transfer functions and specific framework for simulating spatially varying seismic underground motions of media-transition site","authors":"Guohuan Liu, Xinyang Li","doi":"10.1142/s1793431123500410","DOIUrl":"https://doi.org/10.1142/s1793431123500410","url":null,"abstract":"","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":"20 S36","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139146916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-12-29DOI: 10.1142/s1793431123500367
K. Hacıefendioğlu, K. Ozgan, S. Adanur, A. Altunışık, Betul Demirer, Murat Gunaydin
{"title":"Estimation of Damage Levels in Masonry Structures following Earthquake Impact using Deep Learning-Based Segmentation Method","authors":"K. Hacıefendioğlu, K. Ozgan, S. Adanur, A. Altunışık, Betul Demirer, Murat Gunaydin","doi":"10.1142/s1793431123500367","DOIUrl":"https://doi.org/10.1142/s1793431123500367","url":null,"abstract":"","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":"80 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139145886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-12-29DOI: 10.1142/s1793431123500422
Kooshyar Fadayi Asiabsary, Navid Hadiani, Amir Hossein Eghbali, Seyed Mohammad Ali Sadreddini
{"title":"Effects of Inclination of Longitudinal and Vertical Acceleration Components of Near-field Earthquake Records on Seismic Responses of Pile Foundation-Superstructure Systems in Liquefiable Soil Bed","authors":"Kooshyar Fadayi Asiabsary, Navid Hadiani, Amir Hossein Eghbali, Seyed Mohammad Ali Sadreddini","doi":"10.1142/s1793431123500422","DOIUrl":"https://doi.org/10.1142/s1793431123500422","url":null,"abstract":"","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":"6 9","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139147686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-12-29DOI: 10.1142/s1793431123500392
Yuebing Li, He Yuze, Liu Yang, Song Qushenglin, Shuang Xing
{"title":"Effect of Site Soil and Bus Bars on the Seismic Performance of an Isolated Power Transformer","authors":"Yuebing Li, He Yuze, Liu Yang, Song Qushenglin, Shuang Xing","doi":"10.1142/s1793431123500392","DOIUrl":"https://doi.org/10.1142/s1793431123500392","url":null,"abstract":"","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":"5 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139147887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Event Detection Techniques and Optimization for Earthquake Early Warning Application","authors":"Anubrata Roy, Siddhartha Sarkar, Amarendra Goap, Satish Kumar","doi":"10.1142/s1793431123500355","DOIUrl":"https://doi.org/10.1142/s1793431123500355","url":null,"abstract":"","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":" 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138620053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-11-24DOI: 10.1142/s1793431123500331
Anupama Das, Tanmoy Konar, Damodar Maity
{"title":"Numerical Investigation on Sloshing Phenomena in U-shaped Containers Subjected to Near-Fault Strong Ground Motions","authors":"Anupama Das, Tanmoy Konar, Damodar Maity","doi":"10.1142/s1793431123500331","DOIUrl":"https://doi.org/10.1142/s1793431123500331","url":null,"abstract":"","PeriodicalId":50213,"journal":{"name":"Journal of Earthquake and Tsunami","volume":"71 34","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139239873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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