Omar Qarani Aziz

Omar Qarani Aziz
Salahaddin University - Erbil | SUH · Department of Civil Engineering

Professor

About

38
Publications
16,925
Reads
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310
Citations
Citations since 2017
19 Research Items
212 Citations
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Introduction
Prof. Dr. Omar Qarani Aziz currently works at the Department of Civil Engineering, Salahaddin University - Erbil. Omar does research in Civil Engineering, Their current project is 'Conference Paper Improvement of torsional resistance from bond strength and reinforcement indexes in fibrous normal strength concrete beams Article Influence of cement and glass powder on the compressive strength of ultra-high performance concrete'.

Publications

Publications (38)
Article
Full-text available
The flexural behavior of precast concrete segmental box girder is significantly depends on the length of segments. This study aims to investigate the effect of segment length at different compressive strengths of concrete on box girder bridges. In this study, six beams divided into two groups with internal tendons having a constant span of 2400 mm...
Article
Full-text available
The application of High-Performance Concrete (HPC) technology has grown considerably in the construction industry due to the advantages associated with its mechanical properties and durability of concrete. The stress-strain model of concrete is essential in the design stage of structural members. Since the development of HPC, the behaviors of many...
Article
Full-text available
Background The use of post-tensioning in girders causes high bearing and compressive stresses in the anchorage zone. In this study, the behavior of the anchorage zone and the interaction between the local and general zone are investigated. The variables included different reinforcements for both the local and general zones for a block of two anchor...
Article
Full-text available
In recent years, strengthening through using fibre reinforcing polymer (FRP), has been widely used in buildings, especially slab-column connections. This is due to several reasons; such as the application of additional loads, incorrect analysis and design and others. There are many standards to deal with the FRP application. Each standard has its o...
Conference Paper
Full-text available
The Ultra high-performance concrete (UHPC) is a new type of concrete that has developed in recent years, and the emerging of ultra-high performance concrete became popular in the construction industry. The properties of materials used in UHPC depends on the desired characteristics of this material. However, UHPC is also a good mechanical property,...
Article
Full-text available
Precast segmental concrete bridges involve multiple concrete segments joined together by posttensioning, and have the advantages of rapid construction, low-cost, and excellent quality control. Joints that represent locations of discontinuity are prominent factors affecting overall structural behavior of segmental bridges. In this study, a comprehen...
Article
Full-text available
An experimental program is carried out to evaluate the mix design and mechanical properties of normal strength concrete (NSC) grade 40 MPa and high-strength concrete grade 60 and 80 MPa. The study investigates using silica fume to produce high-strength concrete grade 80 MPa and highlights the influence of adding steel fiber on the mechanical proper...
Article
Full-text available
Post-tensioning tendons in segmental box girder bridges are usually anchored in very massive diaphragms. This paper presents an analytical investigation of the anchorage zone stresses for an interior pier diaphragm and a rectangular block model (model of diaphragm anchorage zone). The failure load and load-displacement relation for the two cases we...
Article
Full-text available
The conception, development, and worldwide acceptance of segmental construction in the field of precast concrete segmental bridges represent one of the most interesting achievements in civil engineering. The structural behavior of segmental bridges depends largely on the behavior of the joints between segments. In this paper the beginning steps and...
Article
Full-text available
Precast segmental concrete bridge construction involves multiple concrete elements joint together by post-tensioning. The joints that represent locations of discontinuity are the prominent factors affecting the overall behavior of segmental bridges. In this study, a series of single cell, box shaped specimens, with a geometry closely resembling the...
Article
Full-text available
Precast concrete segmental bridges have the advantages of rapid construction speed, excellent quality control and low cost. The structural behavior of segmental bridges largely depends on the behavior of the joints between segments. In this study, a series of specimens with epoxied joints, were tested to assess shear behavior of box girder segmenta...
Conference Paper
Full-text available
The influence of double idealized shear flow zones on the torsional resistance for under-reinforced ultra-high performance fiber reinforced concrete beams subjected to pure torsion was investigated. The concrete beams section was reinforced with two layers of transverse and longitudinal reinforcements, which located in the idealized shear flow and...
Research
Full-text available
The anchorage zone of post-tensioned members can be divided into local and general zone. Many researchers investigated the effect of various parameters of anchorage zone and the accuracy as well as the improvement in the analysis and the design methods. In this article, the survey of literatures is established in order to study the post-tensioning...
Conference Paper
Full-text available
This paper highlights the effect of tension stiffening index on the torsional resistance at the crack and peak loads in under-reinforced fibrous normal strength concrete beams under pure torsional loading. The different grades of steel reinforcements were used with different surface texture of the reinforcements. Four fibrous normal strength concre...
Article
Full-text available
: Shear strength of ultra high performance reinforced concrete deep beams without stirrups predicted by neural network models. The neural network model based on 233 beams from literatures considering different parameters such as span to depth ratio, shear span to depth ratio, concrete compressive strength, amount of longitudinal reinforcement,…etc....
Article
Full-text available
The present paper is a theoretical analyses of three dimensional (3D) finite element (FE) model to predicate the shear stress, shear strain, load deflection and crack propagation of sixteen high performance reinforced concrete deep beams (HPRCDB) with stirrups by ANSYS (v14). The main variables considered were; vertical shear stress (pvfy), ranging...
Conference Paper
Full-text available
The experimental work consisted of testing eleven simply supported reinforced concrete flat plate slabs 800x800x50 mm (31.50x31.50x1.97 in.), loaded through a circular 80 mm (3.15 in.) column, for investigating punching shear strength and behavior of slabs. The main variables were; compressive strength 30-150 MPa (4.35-21.75 ksi), reinforcement rat...
Article
Full-text available
Ultra-high performance fiber reinforced concrete (UHPC) is a new class of concrete that has been developed in recent decades, it has enhanced properties such as; very high compressive strength, improved tensile strength. In this study, three types of concrete were used based on the compressive strength of concrete, named; Normal Strength Concrete (...
Conference Paper
Full-text available
SYNOPSIS Ultra-high performance concrete (UHPC) has evolved in the last couple of decades and it is relatively new type of concrete that exhibits mechanical properties that are far superior to those of conventional concrete and in some cases rival those of steel. The main characteristics that distinguish UHPC from conventional concrete are: the imp...
Conference Paper
Full-text available
Ultra-high performance concrete (UHPC) was appeared in past two decades and it is relatively new type of concrete that exhibits mechanical properties that are far superior to those of conventional concrete and in some cases rival those of steel. The main characteristics that distinguish UHPC from conventional concrete are: the improved compressive...
Article
Full-text available
The flat-plate reinforced concrete slab system has been the subject of numerous studies since the beginning of past century; several experimental and analytical works has been carried out for investigating the different aspects of punching failures in flat-plates. A wide survey of the punching shear strength thesis during a century was performed, i...
Article
Full-text available
This investigation examines experimentally the behavior and ultimate strength of L-shaped reinforced high strength concrete beams under combined shear, bending and torsion. The experimental program consists of casting and testing (13) high strength concrete beams under bending, shear and torsion. The main parameters are the effect of compressive st...
Article
Full-text available
This investigation examines experimentally and statistically the behavior and ultimate strength of L-shape reinforced high strength concrete beams under combined bending and shear. The experimental investigation consists of casting and testing of nine beams which were tested under bending and shear. The effect of compressive strength, longitudinal...
Article
Full-text available
This investigation examines experimentally and statistically the behavior and ultimate strength of L-shape reinforced high strength concrete beams under combined bending and shear. The experimental investigation consists of casting and testing of nine beams which were tested under bending and shear. The effect of compressive strength, longitudinal...
Article
The ultimate strength of reinforced concrete T-beams reinforced with conventional steel bars and short discontinuous steel fibers are studied. It is found that the presence of steel fibers reduced effectively the deflection, width of cracks and also improved the ductility and flexural rigidity of the concrete beams. Hence, an appreciable increase t...
Article
Full-text available
The influence of volume fraction of steel fiber, amount of crushed stone, water — cement ratio and type of mixes on the tensile and compressive strength of concrete has been studied in this paper. Results showed that the increase in volume fraction of steel fiber because an increase in both tensile and compressive strengths by 50% and 15.7% for nat...
Article
1. By a specially devised technique, indwelling catheters have been placed in the portal veins and inferior venae cavae of rats, permitting infusions and sampling in unanaesthetized animals, which can be used and reused for a longer period of time. Not sooner than two days after recovery from the operation, the diuretic response of the unanaestheti...

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