Hossein Yousefpour

• Doctor of Philosophy
• Professor (Assistant) at Babol Noshirvani University of Technology

The Alkali-silica reaction (ASR) is a deterioration phenomenon that causes undesirable expansion and cracking in hardened concrete. This reaction usually occurs between certain types of reactive aggregates and high-alkali cement and is reported in a notable number of reinforced concrete (RC) structures worldwide, for which assessing the residual pe...

گسترش استفاده از فولادهای پرمقاومت از یک سو، و از طرفی دیگر ملاحظات معماری در کاهش مقاطع نهایی اعضای بتن مسلح موجب شده است تا مهار انتهایی میلگردهای قلابدار در ناحیه اتصال، به یک مشکل برای مهندسین تبدیل شود؛ چرا که تامین طول مهاری مستقیم، قطر خم، و طول بعد از خم در بسیاری از موارد به طور خاص برای میلگردهای قطر بالا، در مقاطع بتن مسلح امکان پذیر نخو...

Composite steel–concrete beams are employed in buildings and bridges, which may experience elevated temperatures in case of fire. The residual capacity of composite members that survive fire depends on the performance of their shear connectors. This study investigates the capacity of shear studs in composite floors with no metal deck after experien...

The combined action of steel and concrete in composite beams is accomplished via shear connectors that prevent slip between the two materials. In a fire event, the performance of these shear connectors may be impacted, hence affecting the strength of composite beams during and after a fire. This paper investigates the residual strength of channel-t...

Alkali-Aggregate Reaction (AAR) is a type of destructive and time-dependent chemical process in concrete that occurs between alkali ions in the cement and reactive minerals in certain types of aggregates. First recognized in 1930s, AAR is divided into two major categories of Alkali-Silica Reaction (ASR) and Alkali-Carbonate Reaction (ACR), both of...

The stringent demand for designing fire-resistant structures in recent years has triggered a good deal of effort into theoretical and experimental studies. Structures may be exposed to seismic loading after a fire in the course of their lifetime, resulting in the reduction of their integrity. This study examines the seismic performance of damaged l...

This paper aims to develop an optimal design mixture for concrete containing lightweight expanded clay aggregates (LECA) and silica fume with a holistic view in which the mechanical properties, strength retention at elevated temperatures, costs, and environmental impacts are all considered. Following the response-surface methodology, 30 concrete mi...

Proper understanding of the fracture mechanism of lightweight concrete (LWC) after exposure to high temperatures has a significant role in LWC proportioning design which provides a better comprehension of the structural behavior during a fire event. In this study, the effect of high temperatures (250, 500, and 750 °C) on the fracture parameters of...

This experimental study investigated the compressive behavior of lightweight concrete after exposure to elevated temperatures. In total, 240 samples from 30 different mixtures were prepared and tested to evaluate the compressive strength, elastic modulus, strain at peak stress, and stress–strain relationships of lightweight aggregate concrete (LWAC...

The mechanical properties of light‐weight concrete (LWC) in fire are known to be better than those of normal‐strength concrete (NSC), both at high temperature (hot properties) and after cooling (residual properties). The objective of this paper is to increase the knowledge of LWC's residual properties by testing a number of mixes containing expande...

There has been rapidly growing demand for manufacturing structural lightweight concrete (LWC) owing to its reduced gravity and seismic loads. Concrete is required to meet increasingly more stringent eco-efficiency and sustainability requirements. Therefore, an experimental study on 30 LWC mixtures (S1 to S30) was conducted. The experimental variabl...

The present research is focused on developing efficient, durable flexural members by combining the use of lightweight concrete (LWC), fiber‐reinforced polymer (FRP) bars, and prestressing. The use of LWC reduces the structural weight while providing suitable thermal insulation whereas using FRP bars instead of steel reinforcement provides corrosion...

Pretensioned concrete elements are commonly fabricated with strands 12.7 or 15.2 mm (0.5 or 0.6 in.) in diameter; however, the industry has seen interest in using larger-diameter strands in recent years. The use of larger-diameter strands results in greater transverse tensile stresses within the girder end regions, which may increase cracking at th...

Reinforced concrete (RC) corbels are short cantilever members that are used to transfer eccentric loads into columns or walls. Due to discontinuity in load and geometry, RC corbels cannot be adequately designed using methods that are based on beam theory. AASHTO LRFD Bridge Design Specifications permit the use of the strut-and-tie method (STM) for...

This paper presents an experimental study on transfer length, end-region cracking, and transverse end-region stresses in pretensioned concrete I-girders fabricated using 0.7 in. (17.8 mm) diameter strands on a 2 x 2 in. (51 x 51 mm) grid. The full-scale specimens consisted of two Tx46 and two Tx70 girders that were fabricated in a controlled labora...

■ This paper presents a parametric study on the benefits and limitations of using 0.7 in. (18 mm) diameter strands in precast, pretensioned concrete bridge girders. ■ A validated parametric study tool was used to design a variety of girders with 0.5, 0.6, and 0.7 in. (13, 15, and 18 mm) diameter strands using different span lengths, concrete releas...

An experimental program was conducted to study the effects of using 0.7 in. (17.8 mm) diameter prestressing strands on the performance of pretensioned concrete I-girders under shear critical loading. Four full-scale Texas bulb-T girders (Tx-girders) with different concrete release strengths, member depths, shear span-depth ratios, and strand patter...

To the authors' knowledge, the West Seventh Street Bridge in Fort Worth, Texas is the first precast concrete network arch bridge in the world. Completed in 2013, this bridge consists of 12 identical arches that were precast and post-tensioned near the bridge site. The prefabricated arches, which were 49.8-m long and weighed approximately 2,500kN, w...

This paper reports some of the major findings from the instrumentation of the West Seventh Street Bridge in Fort Worth, Tex. This innovative bridge, completed in 2013 as a replacement for a century-old bridge, consists of 12 prestressed, precast concrete network arches. The bridge was instrumented with 224 vibrating-wire gauges that were embedded i...