In-plane Shear Behaviour of Reinforced Concrete Masonry Panels Under Biaxial Loading PDF Download

Author: James Adam Halucha
Publisher:
ISBN:
Category : Concrete panels
Languages : en
Pages : 189

View

Book Description

Author: Hany Mohamed Seif ElDin
Publisher:
ISBN:
Category :
Languages : en
Pages : 371

View

Book Description
Reinforced masonry (RM) shear walls are the key structural elements widely used to resist lateral loads in masonry buildings due to their capability to provide lateral strength, stiffness, and energy dissipation. The flexural behaviour of RM shear walls is well defined and follows the simple flexural theory of reinforced concrete structures based on plane-section assumption. On the other hand, the shear behaviour of RM shear walls in the plastic hinge region is more complex due to the interaction between the nonlinear responses of their constituent materials, namely: concrete masonry blocks, mortar, grout, and steel reinforcement. The main objective of this thesis is to evaluate the inelastic behaviour of fully grouted RM shear walls that are dominated by shear failure. The research objective was achieved by conducting experimental, numerical, and analytical studies. The experimental work involved assessing the response of nine full-scale fully grouted rectangular RM shear walls when subjected to in-plane axial compressive stress, cyclic lateral excitations, and top moment. The main variables considered were the level of axial compressive stress, shear span to depth ratio, horizontal reinforcement ratio, anchorage end detail, and the spacing of horizontal and vertical reinforcement. The effect of the studied parameters is analyzed and presented in detail according to force-based, displacement-based, and performance-based seismic design considerations. Moreover, nonlinear finite element models were developed to simulate the behaviour of RM shear walls subjected to cyclic loading, and validated using results from the nine RM tested walls. Good agreements with the experimental load-displacement hysteretic loops were achieved in all models. In addition, a parametric study was performed to consider more variations in some of the parameters examined in the experimental work, which arrived at similar conclusions of the tested walls. Using the results of the tested RM shear walls together with the parametric study, an equation for predicting the in-plane shear strength, Vn, of RM shear walls was proposed and verified with results of 64 RM wall tests from five sources in the literature. Statistical analysis was performed to evaluate the accuracy of the proposed equation against ten widely-used equations, including the design equations given in the Canadian Standards Association CSA S304-2014, the US Masonry Standards Joint Committee MSJC-2013, and the Standards Association of New Zealand NZS 4230:2004. The analysis shows that the proposed equation provides a sufficiently conservative and more accurate prediction for Vn than any of the other evaluated equations.

Author: Robert Bruce Petersen
Publisher:
ISBN:
Category : Masonry
Languages : en
Pages : 202

View

Book Description

Author: Ziead Metwally
Publisher:
ISBN:
Category : Concrete masonry
Languages : en
Pages : 0

View

Book Description
Masonry, as a conventional construction material, is widely used due to its durability, strength, hygrothermal performance, and aesthetics. However, the behaviour of masonry structures is not fully comprehended, especially in the face of uncertainty. This lack of understating on the behaviour of masonry structures is usually compensated by imposing overly conservative design provisions. Inherent uncertainties in the material and geometric properties of masonry structures result in large scatter in the experimentally or analytically predicted behaviour. Thus, understanding the influence of these uncertainties on the structural behaviour of masonry structures is of paramount importance to lay down the basis for reliable structural design. This thesis focuses on the uncertainty analysis of the out-of-plane behaviour of reinforced concrete masonry walls using mechanics-based finite element (FE) models and experimental testing data. Specifically, this thesis includes three main phases. In the first phase, the probabilistic behaviour of reinforced concrete masonry walls is investigated, employing mechanics-based macro FE models in conjunction with Monte Carlo simulations (MCS). The effect of the inherited uncertainties in the material and geometric properties on different response quantities (e.g., load capacity and deformation capacity) is also investigated through a variance-based global sensitivity analysis. Additionally, the model uncertainty in FE-predicted load capacity is quantified to characterize the model error, which is found to be influential compared to geometric and material uncertainties, though FE models are commonly used for numerical studies. The second phase focuses on assessing the reliability of reinforced concrete masonry walls loaded out-of-plane with the limit state functions formulated employing the developed macro FE models. In this phase, the importance of model uncertainty on the reliability assessment is revealed. The reliability assessment conducted considering different global and local failure criteria provides insights into their effect on the safety levels of walls. The reliability assessment is found to be sensitive to the adopted failure criteria. In addition, different factors are found to influence the reliability assessment of the walls designed according to the masonry design code; specifically, walls with different slenderness ratios and load eccentricities show inconsistent reliability levels. The model errors associated with the out-of-plane load capacity provided in masonry design codes in North America (i.e., CSA S304-14 and TMS 402-16) are investigated in the third phase. FE based and experimental data are used to quantify the model error associated with design code based models. In addition, the sensitivity of the model error to the variations associated with different design parameters is investigated. It is found that CSA S304-14 is overly conservative for highly slender walls with low load eccentricities, while TMS 402-16 gives more reasonable capacity predictions for such walls. However, TMS 402-16 is found to overestimate the capacities of highly slender walls with relatively high reinforcement ratios and load eccentricities. The code based models are employed in reliability assessment to investigate the influence of the accuracy of the behavioural model on the reliability of the masonry walls. It is found that using the code based models in the reliability assessment without considering their model error results in significantly biased reliability results. This highlights the need and potential room for design code model improvement.

Author: Magdy Mohamed Samir Khattab
Publisher:
ISBN:
Category : Concrete masonry
Languages : en
Pages : 402

View

Book Description

Author: Magdy Mohamed Samir Khattab
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780315934160
Category : Concrete masonry
Languages : en
Pages : 402

View

Book Description

Author: Christina Marie Kapoi
Publisher:
ISBN:
Category : Concrete masonry
Languages : en
Pages : 147

View

Book Description

Author: Kun Hu
Publisher:
ISBN:
Category : Masonry
Languages : en
Pages : 224

View

Book Description

Author:
Publisher: FEMA
ISBN:
Category :
Languages : en
Pages : 270

View

Book Description

Author: Christopher H. Conley
Publisher:
ISBN:
Category : Reinforced concrete
Languages : en
Pages : 364

View

Book Description