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Shear capacity of historical reinforced concrete beams 历史钢筋混凝土梁的抗剪承载力
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2017-06-21 DOI: 10.1504/IJSTRUCTE.2017.10005478
F. Palmisano
Reinforced concrete works, from the origins until the release of the first technical standards, were built by applying patented systems (e.g., Monnier's, Hennebique's) that were often the result of individual intuitions more than scientific and technical knowledge. This is one of the reasons that many of structures built in those years, and still surviving, could not be considered reliable with regard to the structural safety, as it is presently intended. In this scenario, the evaluation of R.C. beam shear capacity becomes crucial. In this article, analysing the tests carried out in Stuttgart in the early 20th century, a preliminary study on the shear capacity assessment of historical R.C. beams is presented. The aim is to verify the applicability to these kinds of beams of the relations given for new constructions in the present Eurocodes. Moreover, a novel formulation for the transversal shear capacity for historical R.C. beams with U-shaped plates is proposed.
钢筋混凝土工程,从起源到第一个技术标准的发布,都是通过应用专利系统(例如,Monnier, Hennebique的)来建造的,这些系统通常是个人直觉而不是科学和技术知识的结果。这就是为什么在那些年建造的许多结构仍然存在的原因之一,就结构安全而言,不能被认为是可靠的,因为它目前的意图。在这种情况下,钢筋混凝土梁抗剪承载力的评估变得至关重要。本文通过分析20世纪初在斯图加特进行的试验,对历史钢筋混凝土梁的抗剪承载力评估进行了初步研究。目的是验证现行欧洲规范中为新结构所给出的关系对这类梁的适用性。此外,还提出了一种新的u型板钢筋混凝土历史梁横向抗剪承载力计算公式。
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引用次数: 0
Coupled numerical investigation of structural glass panels with elastic materials injection and hyperelastic materials injection subjected to locally introduced axial compression 局部引入轴压作用下注入弹性材料和超弹性材料结构玻璃板的耦合数值研究
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2017-06-21 DOI: 10.1504/IJSTRUCTE.2017.10005471
Hani Baghi, H. H. Lavasani
Resisting in-plane loadings is an important issue in the field of glass structures. Glass structures are connected to each other in two ways, and then they connect to the substructure: 1) point supports; 2) linear support; where the first one is more common. Several point supports have been examined by researchers and their stress distribution and failure mechanisms are analysed, but point supports have not been analysed using hyperelastic materials. In this paper, a point support is studied numerically under axial load, then the specimen is modelled using hyperelastic material and the results are analysed and compared to each other. Considering stress distribution and load-displacement diagrams of glass frame model by hyperelastic contact, and comparing them with glass frames containing usual contacts leads to following result: according to hyperelastic materials' properties, which are the same as nonlinear elastic ones, the stress in support contact with glass is 50% lower, and also having less displacement in comparison with glass frames using normal contacts. Based on the results, the glass frames with hyperelastic materials resistance much more load than the ones with normal contacts.
抗面内载荷是玻璃结构领域的一个重要问题。玻璃结构之间有两种连接方式,然后连接到子结构:1)点支撑;2)线性支撑;第一个更常见。研究人员已经研究了几种点状支架,并对其应力分布和破坏机制进行了分析,但尚未对使用超弹性材料的点状支架进行分析。本文对轴向载荷作用下的点支承进行了数值模拟研究,并用超弹性材料对点支承进行了数值模拟,并对模拟结果进行了对比分析。考虑采用超弹性接触的玻璃框架模型的应力分布和荷载-位移图,并将其与常规接触的玻璃框架进行比较,得出如下结论:根据与非线性弹性材料相同的超弹性材料特性,与常规接触的玻璃框架相比,支撑与玻璃接触时的应力降低50%,位移也更小。结果表明,超弹性玻璃框架比普通接触玻璃框架更能抵抗荷载。
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引用次数: 0
The effect of multiple tuned mass dampers on response control of base isolated multi-storey space frame structure 多重调谐质量阻尼器对基础隔震多层空间框架结构响应控制的影响
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2017-06-21 DOI: 10.1504/IJSTRUCTE.2017.084650
K. Shetty, A. Krishnamoorthy, G. Nayak, Dhanalakshmi
Dynamic response of base isolated multi-storey symmetrical and asymmetrical space frame structures with multiple tuned mass dampers (MTMD), subjected to bi-directional harmonic and Mexico earthquake ground motions are studied. A four-storey space frame structure having six degrees of freedom (three translations along x, y, z-axes and three rotations about these axes) at each node is considered for study. Each tuned mass damper (TMD) is modelled using a two-noded element having two translational degrees of freedom at each node. MTMD with uniformly distributed frequencies are considered for this purpose. The effectiveness of MTMD in suppressing the structural response is determined by comparing the response of corresponding structure without MTMD. It is found that the MTMD can be used effectively to suppress the responses of the symmetrical and asymmetrical base isolated space frame structures. The effect of important parameters on the effectiveness of the MTMD is also studied. The parameters include the fundamental characteristics of the MTMD such as damping, total number of MTMD, tuning frequency ratio and frequency spacing of the dampers. It is shown that these parameters have considerable influence on the effectiveness of the MTMD in reducing the dynamic response of the base isolated structure.
研究了具有多重调谐质量阻尼器(MTMD)的基础隔震多层对称和非对称空间框架结构在双向谐波和墨西哥地震动作用下的动力响应。考虑在每个节点具有六个自由度(沿x、y、z轴的三个平移和绕这些轴的三次旋转)的四层空间框架结构进行研究。每个调谐质量阻尼器(TMD)都使用在每个节点具有两个平移自由度的双节点单元进行建模。具有均匀分布频率的MTMD被考虑用于此目的。MTMD在抑制结构响应方面的有效性是通过比较没有MTMD的相应结构的响应来确定的。研究发现,MTMD可以有效地抑制对称和非对称基础隔震空间框架结构的响应。还研究了重要参数对MTMD有效性的影响。参数包括MTMD的基本特性,如阻尼、MTMD的总数、调谐频率比和阻尼器的频率间隔。结果表明,这些参数对MTMD在降低基础隔震结构动力响应方面的有效性有很大影响。
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引用次数: 0
Effects of pulse-like ground motions parameters on inter-story drift spectra of multi-story buildings 脉冲型地震动参数对多层建筑层间漂移谱的影响
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2017-01-25 DOI: 10.1504/IJSTRUCTE.2017.081671
B. Ghanbari, A. Akhaveissy
This article attempts to study the effect of various pulse-like ground motion parameters and local site conditions on the linear response of different multi-story buildings with special shear and flexural behaviour. The multi-story buildings are modelled using a combination of a shear and flexural beams with representative lateral stiffness ratios. A total of 61 near-fault pulse-like ground motions are selected for this study. The effects of peak ground velocity (PGV), PGV/PGA, rupture distance, Arias intensity, earthquake magnitude and local site conditions on maximum inter-story drift spectra (MIDS) and distribution of the inter-story drift ratio (IDR) along the height of the multi-story buildings are evaluated. It was observed that both the fundamental period of the structure and the lateral stiffness ratio can significantly change maximum inter-story drift demands in buildings subjected to pulse-like ground motions. The near-fault pulse-like ground motions are more dangerous for multi-story buildings with flexural behaviour than those with shear behaviour. The effects of peak ground velocity (PGV) and Arias intensity (I) on inter-story drift spectra is more obvious than others parameters.
本文试图研究各种脉冲式地震动参数和当地场地条件对具有特殊剪切和弯曲性能的不同多层建筑线性响应的影响。多层建筑采用具有代表性横向刚度比的剪切和弯曲梁组合建模。本次研究共选取了61个近断层脉状地震动。评价了峰值地面速度(PGV)、PGV/PGA、破裂距离、Arias烈度、地震震级和当地场地条件对多层建筑最大层间漂移谱(MIDS)和层间漂移比(IDR)沿高度分布的影响。研究发现,在脉动地震动作用下,结构的基本周期和横向刚度比都能显著改变建筑物的最大层间位移需求。近断层脉状地震动对具有弯曲行为的多层建筑比具有剪切行为的多层建筑更危险。峰值地面速度(PGV)和Arias强度(I)对层间漂移谱的影响比其他参数更明显。
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引用次数: 2
Assessment of damper performance in controlling cable vibrations using a reliability-based framework 基于可靠性框架控制缆索振动的阻尼器性能评估
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2017-01-25 DOI: 10.1504/IJSTRUCTE.2017.081670
S. Mohammadi, Shaohong Cheng, F. Ghrib
Owing to their long flexible nature and low intrinsic damping, bridge stay cables are prone to various types of wind-induced vibrations, among which the rain-wind-induced vibration is most frequently observed on site. External dampers are widely used to control such unfavourable cable oscillations and their effectiveness in suppressing large-amplitude cable vibrations was addressed in many studies using deterministic approaches. However, the mechanical and/or physical properties of cables and the attached dampers could not only deviate from their respective nominal design values at a given design point, but also vary considerably during the lifetime of a cable-stayed bridge and thus affect damper efficiency. Hence, for a realistic damper performance assessment, these uncertainties should be taken into account. The objective of this paper is to present a time-variant reliability-based framework model to assess how uncertainties in the structural parameters of a cable-damper system would influence the time specific reliability performance of an external damper yielded from the current design practice.
桥梁斜拉索由于其较长的柔性和较低的固有阻尼,容易产生各种类型的风致振动,其中现场最常见的是雨-风致振动。外部阻尼器被广泛用于控制这种不利的电缆振动,并且在许多使用确定性方法的研究中讨论了它们在抑制大振幅电缆振动方面的有效性。然而,缆索和附加阻尼器的机械和/或物理性能不仅可能在给定设计点偏离其各自的标称设计值,而且在斜拉桥的使用寿命期间也会发生很大变化,从而影响阻尼器的效率。因此,对于实际的阻尼器性能评估,应考虑这些不确定性。本文的目的是提出一个基于时变可靠性的框架模型,以评估缆索阻尼器系统结构参数的不确定性如何影响当前设计实践中产生的外部阻尼器的时变可靠性性能。
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引用次数: 1
Estimating the compressive strength of concrete using multiple linear regression and adaptive neuro-fuzzy inference system 基于多元线性回归和自适应神经模糊推理系统的混凝土抗压强度估计
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2017-01-25 DOI: 10.1504/IJSTRUCTE.2017.081669
Faezehossadat Khademi, S. Jamal
Evaluating the concrete quality is a significant factor in the concrete industry. Concrete compressive strength, identified as one of the most important mechanical properties of concrete, is recognised as the most essential parameter for the quality assurance of concrete. In this paper, in order to evaluate the 28-day compressive strength of concrete, the two most challenging models of multiple linear regression (MLR) and adaptive neuro-fuzzy inference system (ANFIS) are developed in MATLAB environment for 160 different concrete specimens and the results are compared with each other. The results indicate that ANFIS model could perfectly predict the compressive strength of concrete; however, multiple linear regression model was not as effective as ANFIS in predicting purposes. The superiority of ANFIS to MLR might be because of the nonlinear relationships between the concrete characteristics which ANFIS is more capable in their modelling purposes.
混凝土质量评价是混凝土行业的一个重要因素。混凝土抗压强度是混凝土最重要的力学性能之一,是保证混凝土质量最重要的参数。为了对混凝土的28天抗压强度进行评价,在MATLAB环境下,针对160种不同的混凝土试件,建立了最具挑战性的多元线性回归(MLR)和自适应神经模糊推理系统(ANFIS)两种模型,并对结果进行了比较。结果表明,ANFIS模型能较好地预测混凝土抗压强度;多元线性回归模型在预测目的上不如ANFIS有效。ANFIS相对于MLR的优势可能是由于具体特征之间的非线性关系,因此ANFIS在建模目的上更有能力。
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引用次数: 27
Visual inspection and non-destructive tests-based rating method for concrete bridges 混凝土桥梁目视检验和无损试验评定方法
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2017-01-25 DOI: 10.1504/IJSTRUCTE.2017.081672
B. Pushpakumara, Sudhira De Silva, G. Silva
Remediation of concrete bridges is an essential requirement of any country. Objectives of this study are to develop a novel condition rating method for existing concrete bridges and to validate the method by assessing condition of bridges. Condition of 18 concrete bridges was assessed from Bentota to Matara, Southern Province in Sri Lanka. Non-destructive tests (NDT) were used to assess the condition of concrete bridges. Standard eigenvectors were obtained from comparison matrices which were developed by using analytical hierarchy process (AHP) to determine the priority weight of each data. Element condition index (ECI) of all elements was separately calculated and overall bridge condition index (OBCI) was determined with adding element significant factor (ESF), element construction type factor (ECTF) and causal factor (CF). Finally, bridge soundness score (BSS) was determined and was used to conclude bridge remediation plan. The proposed method has the ability to rate the overall bridge condition and decide suitable remediation.
修复混凝土桥梁是任何国家的基本要求。本研究的目的是为现有混凝土桥梁开发一种新的状态评定方法,并通过评估桥梁状态来验证该方法。对斯里兰卡南部省本塔至马塔拉的18座混凝土桥梁的状况进行了评估。无损检测用于评估混凝土桥梁的状况。利用层次分析法(AHP)从比较矩阵中获得标准特征向量,以确定每个数据的优先级。分别计算各单元的单元状态指数(ECI),并通过添加单元显著因子(ESF)、单元结构类型因子(ECTF)和因果因子(CF)来确定桥梁整体状态指数(OBCI)。最后,确定了桥梁稳固性评分(BSS),并将其用于制定桥梁修复计划。所提出的方法能够对桥梁的整体状况进行评估,并决定合适的补救措施。
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引用次数: 13
Improving the robustness of R.C. buildings by the activation of the elasto-plastic catenary behaviour 通过激活弹塑性链线行为来提高钢筋混凝土建筑的鲁棒性
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2017-01-25 DOI: 10.1504/IJSTRUCTE.2017.081668
F. Palmisano
According to the latest technical standards, the design capacity to survive actions even extraordinary (explosion, impact and consequences of human errors) is left to the owner. Nevertheless, the analysis of some collapses occurred in the last years shows that it is necessary to give sufficient robustness (i.e. ability of a structure to withstand events or consequences of human errors without being damaged to an extent disproportionate to the original cause) to every building. This fact is also confirmed by the possibility to protect human lives in extreme conditions, completely sacrificing the functionality, by simple measures, sometimes regarding detailing, without substantially increasing the cost of a structural system. In this scenario this article aims to propose a simplified numerical approach able to evaluate the amount of floor reinforcement necessary to activate the elasto-plastic catenary behaviour of R.C. floor slabs.
根据最新的技术标准,设计能力,以生存的行为,甚至非常(爆炸,冲击和人为错误的后果)是留给业主。然而,对过去几年发生的一些倒塌的分析表明,有必要为每座建筑物提供足够的坚固性(即结构承受人为错误事件或后果的能力,而不会受到与原始原因不成比例的破坏)。在极端条件下保护人类生命的可能性也证实了这一事实,通过简单的措施,有时在细节方面,完全牺牲了功能,而不会大幅增加结构系统的成本。在这种情况下,本文旨在提出一种简化的数值方法,能够评估激活钢筋混凝土楼板弹塑性悬链线行为所需的楼板配筋量。
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引用次数: 0
Reliability assessment of structures using interval uncertainty analysis 基于区间不确定性分析的结构可靠性评估
IF 1.3 Q4 ENGINEERING, CIVIL Pub Date : 2014-06-27 DOI: 10.1061/9780784413609.021
M. Modares, Raguez A. Taha, J. Mohammadi
A new method for reliability assessment of structures is developed which enhances the first order reliability method (FORM) for consideration of uncertainties using interval analysis. This method will hereafter be referred to as the interval first order reliability method (IFORM). IFORM benefits from the simplicity of both FORM and interval analysis by avoiding the requirement for the prior knowledge of joint probability density function for the input parameters. Using IFORM, first, uncertain input parameters are quantified by independent interval variables. Then, the first order reliability analysis is performed using input interval parameters leading to the determination of the bounds on the probability of failure (damage) for the entire structure. Several numerical examples that illustrate the capability and feasibility of this method are presented. The results are then compared with those using the FORM and Monte Carlos simulations, in which the advantage of IFORM over the traditional FORM is demonstrated.
提出了一种新的结构可靠性评估方法,改进了一阶可靠度法,利用区间分析法考虑了不确定性。这种方法以后称为区间一阶可靠性方法(IFORM)。通过避免对输入参数的联合概率密度函数的先验知识的要求,IFORM受益于FORM和区间分析的简单性。利用IFORM,首先用独立区间变量对不确定输入参数进行量化。然后,使用输入区间参数进行一阶可靠度分析,从而确定整个结构的失效(损伤)概率界限。算例说明了该方法的能力和可行性。然后将结果与使用FORM和Monte Carlos模拟的结果进行比较,其中IFORM优于传统FORM。
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引用次数: 4
期刊
International Journal of Structural Engineering
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