{"title":"Response Modal Nonlinear Time-History Dynamic Analyses of the Northridge Earthquake of a Two- Storied Steel Structure with Rubber Isolator and Fixed-base Systems","authors":"Nader Zad","doi":"10.33552/ctcse.2021.08.000683","DOIUrl":"https://doi.org/10.33552/ctcse.2021.08.000683","url":null,"abstract":"This paper analyzes and compares the responses of a two-storied steel structure to the 1994 Northridge earthquake in California. Response modal nonlinear time-history dynamic analysis was especially used on the structure with fixed-base and base-isolated systems to show the realistic behavior of the structure. Intuitively, the best choice for the seismic isolation technique is the use of the flexible element, or an isolator, at the structure’s base, which ensures damping. The current research analyzed in depth the application of a base isolator in the structure. In this study, one structure with different support systems was analyzed to investigate the use of base isolation. The research compared the features and performance of a structure with and without base isolation. The steel building was analyzed subjected to earthquake-induced load with and without a base-isolated rubber bearing. The building was modeled by SAP2000 for nonlinear time-history analysis. Ground-motion simulations of the M6.69 1994 Northridge earthquake in California were applied to the steel base-isolated building model. Study results showed that the presence of an isolation system in a structure with 24 feet (7.31 m) height increased the time period of the structure significantly due to reduced resonance throughout the building.","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121953166","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}
{"title":"A Parametric Study on the Effects of Shear Wall Locations in a Typical Five-Story Reinforced Concrete Structure Subjected to a Severe Earthquake","authors":"Nader Zad","doi":"10.33552/ctcse.2021.07.000675","DOIUrl":"https://doi.org/10.33552/ctcse.2021.07.000675","url":null,"abstract":"This work is licensed under Creative Commons Attribution 4.0 License CTCSE.MS.ID.000675. Abstract To minimize earthquake-induced damages in structures, one of the most reliable ways to design and construct earthquake-resistant buildings is to utilize reinforced concrete shear walls because they increase the structural resistance to lateral loads and effectively stiffens and strengthens the structure. This is known as the best seismic-resistant design method that ensures the stability of multi-story buildings against lateral forces when subjected to strong earthquakes. This paper investigates the effects of the shear wall location in a typical low-rise building to improve earthquake resistance. The study initially models a five-story reinforced concrete structure without shear walls and then adds shear walls at different locations in the structure. SAP2000 is used to perform dynamic analysis under the 1994 Northridge earthquake, an example of severe seismic excitation. Response modal nonlinear time-history dynamic analysis is utilized to obtain an accurate representation of the structure’s behavior. The response of the building with and without shear walls is analyzed and compared for various locations of the shear walls in the structure. Study results show that shear walls effectively reduce horizontal displacements and story drifts to achieve compliance with seismic design codes. The use of shear walls also significantly reduces shear stresses, bending moments, and displacements of various members of the structure. Numerical values and maximum percent of possible changes in the design parameter are reported in the paper. Various seismic demands of the elastic models (with and without shear walls) have been evaluated and compared. The presented work claims that shear walls effectively reduce shear stresses. It is a fact that increasing the stiffness of the structure in severe seismic zones could simultaneously attract more seismic forces, and if the reinforcement is not detailed appropriately, it could reduce the ductility of the structure. The structural elements, including frame elements and the shear walls are inelastic.","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"63 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116381754","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}
{"title":"About the Sustainability of Buildings","authors":"C. Bob","doi":"10.33552/ctcse.2021.07.000668","DOIUrl":"https://doi.org/10.33552/ctcse.2021.07.000668","url":null,"abstract":"Buildings are very important industrial sector of sustainable development. The building industry represent approximately 40% of the total energy consumed. The energy used for heating and/or cooling, during the service life of a building is approximately 80% of the total energy consumed through building life cycle; 7% energy is used with row materials and contribution to energy due to demolition is 3%. According to some studies and to the paper of Y.J.GE and H.F. Xiang (IABSE Symposium Bangkok 2009) the Pyramid of Building Sustainability is presented in the Figure 2 (Figure 2).","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130864722","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}
{"title":"Errors in Construction of Facilities in Restricted Conditions","authors":"Sokolova Ns","doi":"10.33552/ctcse.2021.07.000667","DOIUrl":"https://doi.org/10.33552/ctcse.2021.07.000667","url":null,"abstract":"The construction of facilities in cramped conditions requires a special approach to the need to develop and implement measures to ensure the safe operation of the buildings surrounding the building within the limits of geotechnical influence. Builders often neglect the impact of the new facility technology on the possible negative effects (cracks on facades due to uneven precipitation, heels, etc.) of the buildings in use. The term «minimum price» is still used when part of a building is erected below zero. This approach completely disregards the notion of «technical utility». At the same time the builders go to any tricks to reduce the cost. This «irrational» way of construction may eventually result in a substantial increase in the cost of constructing a zero part of a building and, as a general rule, in a longer construction period (agreement on a new project as a result of substitution of another geotechnical technology, passing of new construction expertise). This article examines one negative case from the geotechnical practice of constructing 16 storey dwellings next to an existing five-storey dwelling house.","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129517230","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}
{"title":"Residential Property Development Feasibility Study – A Self-Fulfilling Prophecy?","authors":"S. Yu","doi":"10.33552/ctcse.2021.07.000666","DOIUrl":"https://doi.org/10.33552/ctcse.2021.07.000666","url":null,"abstract":"","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123677778","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}
{"title":"Literature Review: Concrete Filled Steel Tubes Under Transverse Impact Loading","authors":"K. Rahim","doi":"10.33552/ctcse.2021.07.000665","DOIUrl":"https://doi.org/10.33552/ctcse.2021.07.000665","url":null,"abstract":"This work is licensed under Creative Commons Attribution 4.0 License CTCSE.MS.ID.000665. Abstract This literature review paper presents the latest technologies, designs and technics which has been used to improve the transverse impact resistivity of Concrete Filled Steel Tubes (CFST). Moreover, this literature review paper has included past researchers in the field since 1976 up to 2020. Different types of concrete filled steel tube designs and materials subjected to lateral/transverse impact load were discussed, for example, (1) Concrete Filled single skin Steel Tubular CFST, (2) Concrete Filled Double skin Steel Tubular CFDST, (3) Concrete Filled Stainless Steel Tubular CFSST, (4) High Strength Concrete-Filled Steel Tubular HSCFST, (5) Concrete Filled Steel Tubular CFST structural elements strengthened with Fiber Reinforced Polymer FRP, (6) Reinforced Steel Concrete Filled Steel Tubular RSCFST, (7) Partially Concrete-Filled Steel Tubular PCFST structural elements. Besides, the methodologies used by past researchers were argued in terms of geometrical properties, type of analysis, material properties, cross sectional dimensions and boundary conditions of CFST’s. In addition, the numerical mesh, elements, loading conditions used by previous studies were illustrated. Furthermore, the results of previous researchers were examined in terms of failure modes, Impact Force versus Impact Time and Mid-span Deflection versus Impact Time and residual displacements. The core of the problem is the high deflection magnitudes in CFST structural members after being exposed to transverse impact loads. As such, this literature review paper proposes an innovative hybrid design using composite materials to improve the resistivity of concrete filled steel tubes after being exposed to transverse impact load.","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124927372","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}
{"title":"Experience of Using Drilling Injection EDT Piles in Emergency Response of a Public Building","authors":"Sokolova Ns","doi":"10.33552/CTCSE.2021.07.000663","DOIUrl":"https://doi.org/10.33552/CTCSE.2021.07.000663","url":null,"abstract":"The case of ill-considered construction of a two-storey brick building in the zone of geotechnical influence of the operated building which resulted in its emergency condition was considered. Timely accident prevention measures, including reinforcement of the foundation by means of drilled injection EDT piles and safety measures, such as arrangement of prestressed ties from eight rows of high-strength valves enclosing a supporting wall of two rows of drillinginjection EDT piles of Ø350mm, made by electric-discharge technology from the side of the altar, allowed to save the monument of federal architecture from collapse","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131837829","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}
{"title":"The New New? Curated Second Hand as a (Re)Construction Principle for Notre-Dame de Paris","authors":"Daniel Stockhammer","doi":"10.33552/CTCSE.2021.07.000662","DOIUrl":"https://doi.org/10.33552/CTCSE.2021.07.000662","url":null,"abstract":"In view of ever-increasing environmental and climate problems, a sustainable approach to dealing with the world’s resources is indeed being discussed, but the focus is placed primarily on the conservation of physical resources and much less on the reuse of intangible, non-reproducible cultural resources. In architecture, however, recycling cannot be reduced to atoms because both material and immaterial values are embodied within residual building mass [1]. When designing, reuse entails working and building with the past and its meaning for today. The more we understand the existing, “the less we must stand in opposition to it,” says Hermann Czech, “and the easier it will be to understand our decisions as a continuation of a whole” [2].","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126907285","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}
{"title":"Optimum Bored Pile Type Selection for Collapsible Soils","authors":"Sokolova Ns","doi":"10.33552/CTCSE.2021.07.000661","DOIUrl":"https://doi.org/10.33552/CTCSE.2021.07.000661","url":null,"abstract":"The operational reliability of the constructed buildings and structures depends on the rationally accepted type of foundation. In cases of presence of structurally unstable engineering-geological elements (EGE) in foundation, the increased requirements are imposed on design and construction of foundations. For foundation beds composed of collapsible soils of natural occurrence, the main deteriorating indicators are the relative collapsibility coefficient ɛse and the initial collapsible pressure Pse. The neglect of the influence of these indicators in most cases leads to deterioration in the reliable operation of the erected structures. The article presented here gives a case from geotechnical practice, when, a timely discovered error of not taking collapsible characteristics into account, made it possible to avoid an emergency situation at a structure under construction.","PeriodicalId":404185,"journal":{"name":"Current Trends in Civil & Structural Engineering","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125773720","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}