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Benchmarking Evaluation Methodologies for Existing Reinforced Concrete Buildings منبع دانلود

ACI Webinar: Constructability Series: Design and Detailing of Steel Reinforced Concrete Structural Members August 2022 وبینار بسیار آموزنده و کاربردی از ACI درباره ساخت‌پذیری (اجرایی بودن) طراحی و جزییات اجرایی اعضای سازه‌ای بتن مسلح قسمت اول : دانلود قسمت دوم : دانلود Handouts منبع

Collapse Assessment of RC Structures فیلم آموزشی به زبان اصلی در حدود 18 دقیقه مربوط به یک ورکشاپ آموزشی منبع Collapse Assessment of RC Structures.mp4

Design model for shear capacity of RC beams strengthened with two-side CFRP wraps based on effective FRP strain concept Davood Mostofinejad, Amirhomayoon Tabatabaei Kashani & Ardalan Hosseini A simple design model based on effective strain of fibre-reinforced polymer (FRP) to predict shear capacity of reinforced concrete (RC) beams strengthened with two-side FRP wraps is proposed. Five two-side carbon FRP wrapped and five control unstrengthened RC beam specimens were tested, and the obtained results in addition to the experimental results of 32 two-side wrapped RC beams selected from the literature were used to calibrate the model. Performance of the proposed model was compared with fib Bulletin 14 and ACI 440.2R design models. It was shown that fib Bulletin 14 and ACI 440.2R mostly overestimate the FRP contribution to the shear capacity of two-side wrapped RC beams, while ACI 440.2R model is incapable of predicting effective FRP strain for shear-strengthened shallow beams. Results of 20 independent tests on RC beams strengthened in shear with two-side wraps verified that the proposed model fairly estimates the shear capacity of the strengthened RC beams. It was justified and concluded that since the simple proposed model provides more accurate and safe predictions compared with existing guideline models, it may be capable to be used for design purposes. Keywords: carbon fibre-reinforced polymer; reinforced concrete; shear strengthening; debonding; analytical modelling; two-side wrap Paper with Tabatabaei - 2016 - European Journal.pdf

EFFECTIVE STIFFNESS MODEL FOR REINFORCED CONCRETE SLABS By Maria Anna Polakl ABSTRACT: A simple procedure for calculating deflections of reinforced concrete two-way slabs is presented in this paper. The material model for reinforced concrete based on the effective stiffness approach has been implemented in a finite-element program incorporating Mindlin-plate-bending elements. Uncracked concrete is treated as an isotropic linear elastic material, and after cracking, the concrete is considered to be an orthotropic material. The reduced stiffness coefficients after cracking are calculated from the effective moments of inertia in the x- and y-directions. These effective moments of inertia are determined using the formula proposed by Branson (1963). The influence of both bending and torsional moments is included in the formulation. The proposed model has been verified by comparisons with results from tests on slabs with various loading and boundary conditions. A study has also been undertaken to check the sensitivity of the proposed formulation when applied to the analysis of slabs with different reinforcement ratios, boundary conditions, and reinforcement orientations. polak1996.pdf

Seismic Structural Failure Potentialities of Newly Constructed Buildings in Iran. Mohajerani P. J. Civil Eng. Urban., 5(5): 200-209, 2015; pii:S225204301500032-5 Abstract As Iran is located at high seismic risk region and future ground motions are predicated by seismologist, thus, A Case study was conducted to investigate the major seismic structural failure potentialities due to design and constructional flaws in two province of Iran, Tehran and Esfahan, the former with high seismic risk and the latter with an intermediate risk. More than forty buildings were inspected to find the four major failure potentialities in these two provinces. Two imperfections were found in steel structures and two in reinforced concrete buildings. Design and constructional imperfections in protected zone in steel structures and latticed column details are two main points threaten newly constructed steel structures. In reinforced concrete structures, stairway constructional flaws and wrong pipe passing constructional details are the two main defects covered in this study for this type of structures. This paper also presents solutions for each failure potentiality and recommends some constructional and design hints to increase the safety of structure and make them ready for future seismic excitations. Key words: Structural failure potentiality, Constructional imperfection, Earthquake, Risk mitigation, Steel structure, Reinforced concrete structures, Iran [Full text-PDF] منبع: [Hidden Content] J. Civil Eng. Urban., 5 (5) 200-209, 2015.pdf

A Performance-Based Design Approach for Coupled Core Wall Systems with Diagonally Reinforced Concrete Coupling Beams Gang Xuan1, Bahram M. Shahrooz2,*, Kent A. Harries3 and Gian A. Rassati2 1Christie Engineering LLC, Bedminster, New Jersey, USA 2University of Cincinnati, Ohio, USA 3University of Pittsburgh, Pennsylvania, USA (Received: 16 October 2007; Received revised form: 18 March 2008; Accepted: 20 March 2008) Abstract: Coupled core wall systems (CCWs) are lateral force resisting systems that can provide remarkable lateral stiffness for mid- to high-rise buildings, exceeding the lateral stiffness of isolated walls while providing the redundancy and force redistribution capabilities of framed systems. The lateral stiffness provided by CCWs largely depends on the type of coupling beams used to transfer forces between wall piers. Diagonally-reinforced concrete coupling beams are one of the more common details although composite alternatives (e.g., those using structural steel W-shapes, hollow structural steel sections, or embedded steel plates) or beams with rhombic reinforcement are increasingly being selected as viable alternatives. Despite the favorable behavior exhibited by diagonally-reinforced coupling beams in experimental studies, designing and constructing diagonally-reinforced coupling beams having practical span-to-depth ratios presents significant difficulties, impacting the use of CCWs as a viable lateral force resisting system. This paper presents a performancebased design (PBD) approach that allows the designer to successfully proportion a code-compliant CCW system that addresses the shortcomings related to the traditional strength-based design approach. A prototype building is designed following both approaches, and is analyzed both statically and dynamically. Results show that the PBD approach produces a code-compliant structure that satisfies the most pressing constructability constraints. 136943308785082580.pdf