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Improving the Strength and Engineering Properties of Alkali-Activated Slag –Rice Husk Ash Paste at the Early Ages with Addition of Various Magnesium Oxide Content 添加不同氧化镁含量对碱活性矿渣-稻壳灰浆早期强度和工程性能的改善
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.8.3.210-214
C. Hwang, D. Vo, M. Yehualaw, Vu-An Tran
The aim of this study is to evaluate the effect of MgO on alkali-activated slagrice husk ash paste. The mixtures were prepared with GGBFS replaced with10% RHA and modified by 2.5%, 5% and 7.5% MgO. Then these mixtures were compared to the reference mixture (without RHA and MgO content). The properties of paste were tested by flow, compressive strength, thermal conductivity and UPV analysis. In terms of finding, using RHA and MgO remarkably reduced the workability of AASR paste. In additions, the mere use of 10% RHA slightly reduced the strength of paste. However, adding MgO significantly accelerated the hydration of AASR samples in the early age and improved the strength and engineering properties of AASR paste samples.  Key words—rice husk ash, Magnesium oxide, compressive strength, Engineering properties, alkali-activated slag
本研究的目的是评价氧化镁对碱活化稻壳灰浆的影响。用10%的RHA代替GGBFS,分别用2.5%、5%和7.5%的MgO改性。然后将这些混合物与对照混合物(不含RHA和MgO含量)进行比较。通过流动性能、抗压强度、导热性能和UPV分析测试了膏体的性能。结果表明,RHA和MgO的使用显著降低了AASR浆料的可加工性。此外,仅使用10% RHA,膏体强度略有降低。而MgO的加入显著加快了AASR试样早期水化过程,提高了AASR膏体试样的强度和工程性能。关键词:稻壳灰分;氧化镁;抗压强度
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引用次数: 3
Earthquake Remediation by Use of Rocking Columns–Finite Element Method Simulations 利用摇柱进行地震修复-有限元模拟
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.12.1.6-12
N. Javed, A. Turer
— Rocking columns have been used in ancient civilization in the form of large stone columns supporting massive stones above them in seismically active regions such as Greece and Rome; however, their behavior under earthquakes is not well investigated using modern computer simulation technologies. Rocking columns generate a form of seismic isolation of earthquake forces and unlike conventional seismic isolators, rocking columns do not have a constant period of rocking. The natural frequency and stiffness of a rocking column changes based on the amount of horizontal displacement. Therefore, the system over rocking columns has ever changing natural (fundamental) frequency and does not get into a resonance state with the dominant earthquake frequencies. This paper includes a detailed investigation of rocking columns by using nonlinear and large deformation analysis techniques, which were compared and validated against rocking columns in the lab. The verification process enabled simulation of full-size rocking columns of modern buildings.
-在古代文明中,在希腊和罗马等地震活跃地区,摇晃柱以大型石柱支撑其上方的巨石的形式被使用;然而,它们在地震作用下的行为并没有很好地利用现代计算机模拟技术进行研究。摇柱产生一种地震力的隔震形式,与传统的隔震器不同,摇柱没有固定的摇晃周期。摇摆柱的固有频率和刚度随水平位移量的变化而变化。因此,摇摆柱上的体系具有不断变化的固有(基频),不会与主导地震频率进入共振状态。本文采用非线性和大变形分析技术对摇摆柱进行了详细的研究,并在实验室中与摇摆柱进行了比较和验证。验证过程可以模拟现代建筑的全尺寸摇柱。
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引用次数: 0
Experimental Research on Creep Properties of Hard Rock under Long-term Load Conditions 长期荷载作用下硬岩蠕变特性试验研究
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.8.4.310-313
S. Yang, L. Zhang
— As the excavation depth of underground engineering increases, the engineering becomes more and more complex. The splitting failure of underground caverns of large hydropower station is a common phenomenon that was not accounted for theoretically so far, which is one of the important factors affecting the safety of underground construction and the long time running stability. Long-term load conditions and great depth are considered to be the main factors that lead to the creep deformation of underground hard rock mass. Therefore creep tests under long-term load conditions are conducted for the purpose of studying the creep properties of the deep hard rock mass. An important hydropower station is taken as the research background project, and the Granite is taken as the research object to carry out the long-term creep test. During the test, the effect of long-term load conditions of hard rock is mainly recorded. Based on the results of the systematic analysis, it is concluded that the mechanical properties of granite are largely affected by high stress: (1) The creep process of granite can be divided into three stages: the transient creep, the steady creep, and the accelerated creep, with different strain rate in each creep region. (2) The granite generates instantaneous deformation at every loading level, the higher the confining pressure, the greater the initial transient strain. (3) The creep deformations of specimens increase with time and stress, it begins to appear an obvious creep deformation when the stress level reaches a certain value, the higher the confining pressure, the greater the creep deformation, and the earlier the creep phenomenon. (4) The higher the confining pressure, the shorter the creep duration, and the more liable to be broken. (5) With the increase of confining pressure, the rock tends to shear failure.
-随着地下工程开挖深度的增加,工程变得越来越复杂。大型水电站地下洞室劈裂破坏是一种普遍存在的现象,但至今未在理论上加以解释,是影响地下施工安全和长期稳定运行的重要因素之一。长期荷载条件和大深度荷载条件是导致地下硬岩体蠕变的主要因素。为此,开展了长期荷载条件下的蠕变试验,研究深部硬岩体的蠕变特性。以某重要水电站为研究背景工程,以花岗岩为研究对象,进行长期蠕变试验。试验中主要记录了硬岩长期荷载条件的影响。根据系统分析结果,得出高应力对花岗岩力学性能影响较大的结论:(1)花岗岩的蠕变过程可分为瞬时蠕变、稳态蠕变和加速蠕变3个阶段,各蠕变区域应变速率不同;(2)花岗岩在各加载水平下均产生瞬时变形,围压越高,初始瞬态应变越大。(3)试件蠕变随时间和应力增大而增大,当应力水平达到一定值时开始出现明显的蠕变变形,围压越高,蠕变变形越大,蠕变现象发生越早。(4)围压越高,蠕变持续时间越短,越容易发生破坏。(5)随着围压的增大,岩石趋于剪切破坏。
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引用次数: 0
Analysis of Health Landscape Performance of Urban Parks in Severe Cold Regions Based on Citizen Satisfaction 基于市民满意度的严寒地区城市公园健康景观绩效分析
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.11.4.108-113
Yue Zhu
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引用次数: 0
Running Safety of Vehicle on the Bridge under the Sudden Change of Wind Loads Due to Wind Barriers 风障作用下桥上车辆在风荷载突变下的行车安全
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.8.2.165-170
Xinyu Xu, Xiaobo Zheng, Li Yongle
Wind barriers are the efficient and simplest devices for the wind protection of vehicle. To investigate the dynamic responses of vehicle passes through the transition section of wind barriers, a high-speed railway simplysupported beam bridge was taken as the research object. Aerodynamic characteristics of vehicle-bridge system were tested in wind tunnel tests, and the effects of wind barrier porosities were considered. The wind-vehicle-bridge (WVB) coupling analysis was conducted by Dummy Body Coupling (DBC) method. The results show that dynamic responses of the vehicle generally tend to increase with the increase in speed. In the wind barrier section, the dynamic responses would decrease, accounting for the wind shielding effects. The lateral and vertical accelerations are sensitive to the sudden changes of wind loads due to the wind barrier, while the lateral force and reduction rate of wheel load have little sudden change when the vehicle enters and leaves the wind barrier section.
防风屏障是最有效、最简单的车辆防风装置。为研究车辆通过风障过渡段时的动力响应,以某高速铁路简支梁桥为研究对象。通过风洞试验对车桥系统的气动特性进行了测试,并考虑了风障孔隙率对车桥系统气动特性的影响。采用假体耦合(DBC)方法进行了风-车-桥(WVB)耦合分析。结果表明,随着车速的增加,车辆的动态响应总体呈增大趋势。在风障截面,动力响应减小,这是由于风屏蔽效应的影响。横向加速度和垂直加速度对风荷载的突变敏感,而车辆进入和离开风荷载截面时,横向力和轮载减少率的突变较小。
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引用次数: 0
Advanced Scalar-valued Intensity Measures for Residual Drift Prediction of SMRFs with Fluid Viscous Dampers 带粘性阻尼器的smrf残余漂移预测的先进标度强度测度
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.12.1.20-25
F. Kazemi, B. Mohebi, N. Asgarkhani, Atefeh Yousefi
—Maximum Residual Inter-story Drift Ratio (RIDR max ) plays an important role to specify the state of a structure after severe earthquake and the possibility of repairing the structure. Therefore, it is necessary to predict the RIDR max of Steel Moment-Resisting Frames (SMRFs) with high reliability by employing powerful Intensity Measures (IMs). This study investigates the efficiency and sufficiency of scalar-valued IMs for predicting RIDR max of two sets of the 3-Story, 6-Story, and 9-Story SMRFs with and without using linear Fluid Viscous Dampers (FVDs). Incremental Dynamic Analysis (IDA) was performed with considering RIDR max as engineering demand parameters using Opensees. Results of analysis showed that two scalar-valued IMs of IM M (α=0.5 ) and Sa avg M-D had lower values of the variations of standard deviation of natural logarithm of IM of RIDR max , σlnIM RD , which shows the efficiency of these IMs. Moreover, these scalar-valued IMs achieved higher p - values with respect to seismic ground motion features of M, R, and Vs30, which shows the sufficiency of assumed IMs. Therefore, two scalar-valued IMs of IM M (α=0.5) and Sa avg M-D are proposed as optimal scalar-valued IMs for predicting the RIDR max of SMRFs
最大剩余层间位移比(RIDR max)对于确定结构在强震后的状态和修复结构的可能性具有重要作用。因此,有必要采用强有力的强度指标(IMs)来预测具有高可靠性的钢抗弯矩框架(SMRFs)的RIDR最大值。本研究探讨了标量值IMs在使用线性流体粘性阻尼器(fvd)和不使用线性流体粘性阻尼器(fvd)时预测3层、6层和9层smrf的两组RIDR最大值的效率和充分性。使用Opensees将RIDR max作为工程需求参数,进行增量动态分析(IDA)。分析结果表明,imm (α=0.5)和Sa avg M- d的两种标值IMs对RIDR max的IM自然对数标准差σlnIM RD的变化值较低,表明了这两种IMs的有效性。此外,这些标值IMs相对于M、R和Vs30的地震地震动特征获得了更高的p值,这表明假设IMs的充分性。因此,我们提出imm (α=0.5)和Sa avg M- d两个标值IMs作为预测SMRFs RIDR max的最优标值IMs
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引用次数: 0
Optimizing the Performance of Health Facilities in Egypt: Using a Hybrid Approach Combining Biophilic Design and BIM 优化埃及卫生设施的性能:使用结合亲生物设计和BIM的混合方法
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.12.3.99-105
Rowan H. El Sheikha, Hassan M. Abdel-Salam, A. F. Bakr
—Most of the health facilities in Egypt neglect the importance of human connection with the surrounding nature, which results in multiple physical, psychological, and emotional problems such as stress, lack of concentration, fatigue, and a decrease in performance. To overcome this problem, this paper suggests a hybrid approach combining Biophilic design and BIM. This approach combines both Biophilic design and BIM through a restorative environmental design concept to combine both environmental and human aspects. This study's results develop a checklist that assesses Biophilic design patterns that exist in buildings by analyzing the KTPH case example. In addition to exploring a framework for Building Information Modeling (BIM) to be used with sustainability assessment methods in buildings. The paper concludes with the importance of the human-nature relation and how to apply this approach in Egypt, in addition to theoretically combining Biophilic design and BIM.
-埃及的大多数卫生设施忽视人与周围自然联系的重要性,这导致多种身体、心理和情绪问题,如压力、注意力不集中、疲劳和表现下降。为了克服这一问题,本文提出了一种结合亲生物设计和BIM的混合方法。这种方法结合了亲生物设计和BIM,通过恢复性的环境设计概念,将环境和人类方面结合起来。本研究的结果开发了一个清单,通过分析KTPH案例来评估建筑中存在的亲生物设计模式。除了探索建筑信息模型(BIM)框架外,还将与建筑物的可持续性评估方法一起使用。本文总结了人与自然关系的重要性,以及如何在埃及应用这种方法,以及在理论上将亲生物设计与BIM结合起来。
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引用次数: 0
Effect of Superabsorbent Polymer on the Hydration Properties of High-Performance Concrete 高吸水性聚合物对高性能混凝土水化性能的影响
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.12.2.32-36
A. Joseph, Zainab Awadh, D. Dashti, J. Chakkamalayath
—The physico-chemical and durability properties of the concrete depend on how efficiently the curing process occurs. Cement particles undergo a series of chemical reactions with water molecules to form several cement hydration products during curing. However, the low water to cement ratio in concretes, such as high-performance concrete (HPC) and ultra-HPC with supplementary cementitious materials, lack enough water molecules for the curing process to complete, resulting in autogenous shrinkage and hence early age micro cracking. Mitigation of shrinkage is a mandatory requirement in sustainable construction projects, which can be achieved through proper curing of HPC. This paper reports the effects of superabsorbent polymer (SAP) as internal curing material on the properties of hardened HPC monitored by N 2 - adsorption, X-ray diffraction (XRD), and FT-IR spectroscopy after 28 days of curing in water and air. The N 2 adsorption analysis showed an increase in total porosity of the specimens with SAP due to the formation of more macro pores. Higher amounts of Ca(OH) 2 were detected in samples with SAP by the X-ray diffraction analysis indicating the formation of more cement hydration in those specimens.
-混凝土的理化性能和耐久性取决于养护过程的效率。水泥颗粒在固化过程中与水分子发生一系列化学反应,形成多种水泥水化产物。然而,由于混凝土中水灰比较低,如添加了胶凝材料的高性能混凝土(HPC)和超高性能混凝土(ultra-HPC),缺乏足够的水分子来完成养护过程,导致自收缩,从而产生早期微开裂。减缓收缩是可持续建设项目的强制性要求,可通过对高性能混凝土进行适当养护来实现。本文报道了高吸水性聚合物(SAP)作为内固化材料对硬化HPC在水和空气中固化28天后性能的影响,并采用N -吸附、x射线衍射(XRD)和傅里叶红外光谱(FT-IR)进行了监测。氮吸附分析表明,由于形成了更多的宏观孔隙,SAP样品的总孔隙率增加。通过x射线衍射分析,在SAP样品中检测到较高量的Ca(OH) 2,表明这些样品中形成了更多的水泥水化。
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引用次数: 0
Integrating 4D Simulation and Automation Features of BIM toward Construction Safety Management 集成BIM的4D仿真和自动化特性,面向施工安全管理
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.12.3.68-75
E. N. Piniano, M. Iwanami
—Despite the benefits that the construction industry contributes to the global economy, the impacts that it causes on occupational safety remain a significant concern. Moreover, specific systems are necessary to account for the factors influencing the implementation of construction safety. Proportionately, integrating advanced technologies such as Building Information Modelling/Management (BIM) manifests as one of the strategies for mitigating construction safety programs. Thus, this research aims to expand previous research and fill the gaps in current measures taken for adopting and implementing BIM, focusing on improving construction safety management and implementation. This study presents a framework that incorporates 4D Simulation and automation features of BIM. The framework aims to overcome challenges related to regulating construction schedules, taking into account weather conditions, and adhering to standard safety codes in the construction safety planning process. The ultimate goal is to promote sustainable construction safety management. This research conducts a case study on a large-scale incineration project in Japan, considering the Japanese construction working environment and Japan Industrial Safety and Health Association (JISHA) and JICA Safety Standard Specifications (JSSS).
-尽管建造业为全球经济作出了贡献,但它对职业安全造成的影响仍然是一个值得关注的问题。此外,有必要制定具体的制度来考虑影响施工安全实施的因素。相应地,整合先进技术,如建筑信息模型/管理(BIM),是缓解建筑安全计划的策略之一。因此,本研究旨在扩展前人的研究,填补目前BIM采用和实施措施的空白,重点是提高施工安全管理和实施。本研究提出了一个结合了BIM的4D仿真和自动化特性的框架。该框架旨在克服与规范施工进度、考虑天气条件以及在施工安全规划过程中遵守标准安全规范相关的挑战。最终目的是促进可持续的建筑安全管理。本研究以日本某大型焚化工程为个案,考虑日本建筑作业环境及日本工业安全卫生协会(JISHA)及日本国际协力机构(JSSS)安全标准规范。
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引用次数: 0
General and Special Materials Selection Criteria for Interior Design Projects 室内设计项目一般和特殊材料选择标准
Pub Date : 1900-01-01 DOI: 10.18178/ijscer.8.1.16-20
Donia M. Bettaieb, Raif B. Malek, A. Alawad
‎—In the field of interior design, materials are considered of the most important elements that play a vital role in the functionality of internal spaces.‎ ‎The selection of these materials according to clear criteria is considered one of the most important inputs guaranteeing the project's success and practical efficiency.‎ ‎In this context, this study aims to look into the general criteria for the selection of a material‎ according to previous studies, in order to explore and clarify the special criteria that should be adopted and implemented when selecting materials in the internal design project.‎ ‎This research work is mainly due to the researchers' observation of an evident lack in the quantity of information on the selection criteria of materials in the field of interior design, whereas most of what has been reported in numerous related studies‎ are information only showing the technical properties of the material, thus qualitatively limiting the designer's choices and the application of his creative ideas.‎ ‎This research in previous studies showed that there are general criteria for materials, which are essentially artistic, technical, functional, aesthetic, economic and environmental, that should be considered when choosing the material as a design element. This research also concluded the special criteria for the selection of materials as a design element and as an element listed as part of a group of elements that constitute a comprehensive aesthetic functional system reflecting solutions for the interior environment, which, in turn, reflects a range of sensory effects emanating through the material, shape, texture and color. ‎ ‎It is expected for the results of this research to assist those who work in the field of interior design from the academics who teach this discipline, the students, as well as the professional working at consulting and executive offices in the labor market, by providing them with the selection criteria for materials in interior design projects.‎  ‎
在室内设计领域,材料被认为是最重要的元素,在内部空间的功能中起着至关重要的作用。根据明确的标准选择这些材料被认为是保证项目成功和实际效率的最重要的投入之一。在此背景下,本研究旨在根据以往的研究,探讨材料选择的一般标准,以探索和明确内部设计项目中材料选择应采用和实施的特殊标准。这项研究工作主要是由于研究人员观察到室内设计领域材料选择标准的信息数量明显缺乏,而在众多相关研究中报道的大多数信息都只是显示材料的技术特性,从而在定性上限制了设计师的选择和他的创意的应用。在以往的研究中,这项研究表明,在选择材料作为设计元素时,应该考虑材料的一般标准,这些标准本质上是艺术性、技术性、功能性、审美性、经济性和环保性。本研究还总结了作为设计元素的材料选择的特殊标准,并将其列为一组元素的一部分,这些元素构成了一个综合的美学功能系统,反映了室内环境的解决方案,这反过来又反映了通过材料,形状,纹理和颜色散发出的一系列感官效果。预计这项研究的结果将帮助那些在室内设计领域工作的人,包括教授这一学科的学者、学生,以及在劳动力市场的咨询和行政办公室工作的专业人员,为他们提供室内设计项目中材料的选择标准。“”
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引用次数: 0
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International journal of structural and civil engineering research
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