COMPARATIVE SEISMIC PERFORMANCE ASSESSMENT OF UHPC JACKETING AND SCED BRACING TECHNIQUES

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Roshen Joseph ◽  
Aman Mwafy ◽  
M. Shahria Alam
Keyword(s):  
Seismic Performance ◽  
High Performance ◽  
High Performance Concrete ◽  
Residential Building ◽  
Seismic Retrofit ◽  
Performance Criteria ◽  
Fragility Functions ◽  
Seismic Performance Assessment ◽  
Existing Building ◽  
Seismic Code

Observed damage to existing pre-seismic code buildings in previous earthquakes has raised interest among the engineering community for improving the performance of these structures using different seismic retrofit measures. This paper throws light on contemporary techniques for the seismic retrofit of RC buildings, namely ultra-high-performance concrete (UHPC) jacketing and self-centering energy dissipative (SCED) braces. Detailed fiber-based numerical modeling of a benchmark structure is undertaken to evaluate the effectiveness of the selected retrofit measures. The case study structure is a two-story pre-seismic code residential building designed for gravity and wind loads, exhibiting poor seismic performance. Along with the two retrofit strategies investigated, several parameters are also considered. Inelastic static pushover and incremental dynamic analyses are conducted to select the retrofit measures and assess their effects on seismic performance. Using a collection of far-field earthquake records and a set of performance criteria, fragility functions are constructed to assess the vulnerability of the benchmark structure with and without the retrofit solutions. The study shows that the adopted index that links cost to the seismic performance obtained from the fragility functions can provide a rational ranking of the selected retrofit approaches relative to the existing building and support selecting the most effective and economical alternative.

Development of Some Performance-Based Material Specifications for High-Performance Concrete Pavement

2003 ◽  
Vol 1834 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Prasada Rao Rangaraju
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Pavement ◽  
Performance Criteria ◽  
Test Results ◽  
Department Of Transportation ◽  
Performance Specifications ◽  
Concrete Materials ◽  
Practical Feasibility

In collaboration with FHWA, the Minnesota Department of Transportation (Mn/DOT) has successfully completed its first experimental high-performance concrete pavement (HPCP) project under the Testing and Evaluation Program (TE-30). This project is one of the 22 projects funded under the TE-30 Program. With a structural design life of 60 years, this HPCP is unique in that it incorporates significant changes to the existing Mn/DOT specifications on concrete materials. Some of the new materials-related specifications developed as a part of this project are based on performance criteria that influence long-term durability of the pavement structure. The background and considerations for selecting the new performance measures are discussed, and test results are presented that evaluate the practical feasibility of establishing and achieving the performance specifications.

Seismic Performance of Self-Centering UHPC Retainers Applied to Medium-Small Span Concrete Bridges

2019 ◽  
Author(s):  
Wenpeng Wu ◽  
Shiguo Long ◽  
Huihui Li
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
High Performance ◽  
Load Transfer ◽  
High Performance Concrete ◽  
Design Method ◽  
Structural Characteristics ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Seismic Resistant

<p>Seismic resistant retainer is an important component for seismic design of the medium‐small span bridges. However, it’s difficult for the bridge engineers to design a reasonable transverse retainer due to deficiency of design detail in most of current seismic design specifications. Therefore, this paper proposed a prestressed prefabricated concrete retainer that utilize the ultra‐high performance concrete (UHPC). Firstly, the structural characteristics and the seismic design method of the new proposed retainer is illustrated. The OpenSEES model of the case‐study bridge were simulated by considering three different types of seismic resistant retainers. A total of ten high intensity ground motions were selected to conduct the nonlinear time history analysis (NTHA). Subsequently, to investigate the seismic performance of the proposed UHPC retainer, this paper performs the comparative study of seismic responses for different bridge components. It is concluded that, the proposed retainer can provide excellent displacement capacity and help to reduce the seismic damage of bridge piers significantly. In addition, the new retainer has strong ability to keep self‐centering to help the bridge reducing the residual displacement of superstructure under strong seismic events. The proposed UHPC retainer is applicable to the rapid prestressed prefabricated construction process and has a clear load transfer mode under earthquake actions. Therefore, it is a good candidate to the multi‐level performance‐based seismic design of the medium‐small span bridges.</p>

Study on Energy-Saving Residential Building Structures of Multi-Ribbed Composite Walls with High Performance Concrete

2006 ◽  
Vol 302-303 ◽  
pp. 444-450
Author(s):  
Yin Zhang ◽  
Qian Feng Yao ◽  
Yong Gang Ding
Keyword(s):  
Energy Saving ◽  
High Performance ◽  
High Performance Concrete ◽  
Residential Building ◽  
Economic Benefits ◽  
Building Structures ◽  
New Energy ◽  
Good Energy ◽  
Saving Effect ◽  
Seismic Behaviors

In this paper, the study and application of an entirely new energy-saving residential building structure, whose wall is constructed with multi-ribbed composite wall and latent frame. Based on experimental research and theoretical analysis, it was found that the structure system had good seismic behaviors, strong structure adaptability and good energy-saving effect. At the same time, notable social and economic benefits have been shown in several examples.

Seismic performance of seawater and sea sand concrete-filled ultra-high performance concrete tubes under low-cycle reversed lateral loading

2020 ◽  
pp. 136943322098052
Author(s):  
Gang Liu ◽  
Bo Shan ◽  
Dade Lai ◽  
Fucai Liu ◽  
Yan Xiao
Keyword(s):  
Compressive Strength ◽  
Seismic Performance ◽  
High Performance ◽  
Composite System ◽  
High Performance Concrete ◽  
Lateral Loading ◽  
Ultra High Performance Concrete ◽  
Sea Sand ◽  
Seismic Design Code ◽  
Marine Engineering

Seawater and sea sand concrete (SWSSC) filled ultra-high performance concrete (UHPC) tube (SFUHPC tube) column is a cement-based tubular composite column, which combines the excellent compressive strength and toughness of UHPC and lateral confining action from fiber reinforced polymer (FRP) hoops. The novel composite system has the potential to be used in marine engineering. The aims of this paper focus on evaluating the seismic performance of SFUHPC tube columns for being designed in costal and marine engineering. A series of low-cycle reversed lateral loading tests were conducted on five relatively large-scale specimens. FRP hoop volumetric ratio, compressive strength of filling SWSSC, and the types of FRP bar were selected as test parameters in this investigation. The failure modes, hysteretic responses and effects of main parameters were studied and discussed. SFUHPC tube columns exhibited flexural failure mode without visible spalling of the UHPC cover. It is noteworthy that the limit plastic drift ratios of all SFUHPC tube columns exceed the specified limits (0.02) in accordance to the rare earthquake requirement in seismic design code. The current study reveals that the proposed composite columns have acceptable ductility and relatively reliable lateral resistant performance for being used in the marine engineering. From the point of view of seismic performance, filling high strength SWSSC in UHPC tube is acceptable for the proposed composite system.

Sign in / Sign up

Export Citation Format

Share Document