Maryam Nazari

California State University, Los Angeles | CSULA

Rocking walls continue to gain interest in seismic regions due to their ability of re-centering the building system after major earthquakes. However, they have low inherent damping, thus they are often supplemented with energy dissipating elements. A rocking wall supplemented with partially debonded longitudinal bars is named as a hybrid rocking wa...

Structural rocking walls are of interest in seismic applications as they are capable of re-centering after a major earthquake with little damage. However, these wall systems have low inherent damping capabilities, which can lead to long oscillations if they are not supplemented with energy dissipating elements. For this purpose, Hybrid Rocking Wall...

Non-auto transportation infrastructure, such as bicycle lanes and sidewalks, serves as an efficient means of public mobility. Improving the sustainable design and construction of the concrete slabs that compose such roads promotes environmental and economic benefits, spanning the usage of green sources of materials and reduced maintenance costs. In...

This paper presents an investigation on the cyclic behavior and design aspects of a hybrid self-centering wall (SW), in terms of the wall’s axial stress and post-tensioning tendons’ prestressing ratios. These key parameters are examined extensively within the context of both force and displacement-based design approaches. Finite element models of S...

Over the past two decades, precast concrete members have been utilized in seismically resilient structures. In developing these structures, different techniques have been used for connecting the precast members to the foundation. In building construction, unbonded post-tensioning (PT) tendons can anchor a precast wall to the foundation, resulting i...

This study investigated the effect of foundation type and layout on the seismic vulnerability of tall reinforced concrete buildings using fragility curves. To this end, the seismic fragility of 12-, 18-, and 24-story buildings sitting on shallow and pile foundations (i.e., with rigid and flexible pile caps) were evaluated. The uncertainty in the st...

Precast concrete rocking walls with unbonded post-tensioning, as a seismic resilient system, dissipate energy imparted to them during an earthquake through inherent viscous damping, impact damping due to the wall rocking on top of the foundation, and any available hysteretic damping. A shake table study on eight rocking walls designed with differen...

Influences of different variables that affect the effective flexural rigidity of reinforced concrete (RC) members are not considered in the most seismic codes. Furthermore, in the last decades, the application of steel fibers in concrete matrix designs has been increased, requiring development of an accurate analytical procedure to calculate the ef...

Given the low representation of women among engineering faculty, it is important to ensure women in engineering academia have networking opportunities and resources necessary to advance in their careers. To this end, an online survey was sent in April 2018 to engineering faculty employed at California State University (CSU) campuses offering a degr...

The precast wall with end columns, known as the PreWEC, was developed as a solution for resisting earthquake lateral loads and validated using quasistatic testing. This paper presents a shake table investigation of this system, which evaluated the performance of four PreWEC test units with total damping varying between 9 and 16% using multiple-leve...

The precast wall with end columns, known as the PreWEC, was developed as a solution for resisting earthquake lateral loads and validated using quasistatic testing. This paper presents a shake table investigation of this system, which evaluated the performance of four PreWEC test units with total damping varying between 9 and 16% using multiple-leve...

Precast concrete walls with unbonded post-tensioning provide a simple self-centering system. Yet, its application in seismic regions is not permitted as it is assumed to have no energy dissipation through a hysteretic mechanism. These walls, however, dissipate energy imparted to them because of the wall impacting the foundation during rocking and l...

Structural systems designed to current seismic codes are aimed at preventing collapse, thereby ensuring life safety, but they may sustain irreplaceable damage in well-designed plastic hinge regions. This design approach can also cause permanent lateral deformation to the structures as well as significant economic losses due to downtime. Consequentl...