Health monitoring of reinforced concrete structures based on PZT admittance signal

2009 ◽  
Author(s):  
Dansheng Wang ◽  
Hongping Zhu ◽  
Danyan Shen ◽  
Dongdong Ge
Keyword(s):  
Reinforced Concrete ◽  
Health Monitoring ◽  
Concrete Structures ◽  
Reinforced Concrete Structures

Integration and evaluation of multiple piezo configurations for optimal health monitoring of reinforced concrete structures

2017 ◽  
Vol 28 (19) ◽  
pp. 2717-2736 ◽  
Author(s):  
Naveet Kaur ◽  
Lingfang Li ◽  
Suresh Bhalla ◽  
Yong Xia ◽  
Pinghe Ni ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Health Monitoring ◽  
Concrete Structures ◽  
Mechanical Impedance ◽  
Metal Wire ◽  
Small Range ◽  
Reinforced Concrete Structures ◽  
Complex Behaviour ◽  
Damage Level ◽  
Impedance Technique

Since the last two decades, the electro-mechanical impedance technique has undergone extensive theoretical and experimental transformations coupled with the evolution of newer practical adaptations and variants. Notable among these are the metal wire–based variant, the dual piezo configuration and the embedded configuration, over and above the conventional surface-bonded configuration. Although there is a plethora of electro-mechanical impedance–related research devoted to metallic structures, only a limited number of studies are available for reinforced concrete structures, which are characterized by more complex behaviour and pose multiple problems for the electro-mechanical impedance sensors such as small range and high damping due to heterogeneous constitution. This article presents, for the first time, a comprehensive comparative study covering four different variants, namely, the surface-bonded single piezo configuration, the embedded single piezo configuration and the metal wire single piezo configuration in electro-mechanical impedance technique for structural health monitoring of a real-life-sized reinforced concrete beam subjected to destructive testing. The article also proposes a modified and more practical version of the dual piezo configuration called the modified dual piezo configuration, employing concrete vibration sensors. It is found that the modified dual piezo configuration is the most expedient among all variants in capturing the damage with respect to the first occurrence of cracks and the final warning of ultimate failure. Metal wire single piezo configuration is good in detecting the first level of damage; however, its efficiency ceases thereafter when crack size increases. It can be considered as an alternative to surface-bonded single piezo configuration in the scenarios where the damage level is incipient. The sensitivity of the modified dual piezo configuration increases with increasing number of actuators connected in parallel due to an increase in the output current. Also, contrary to the surface-bonded single piezo configuration, the susceptance signature of the modified dual piezo configuration is equally sensitive to damage due to the absence of capacitance part in its admittance signature. Hence, its susceptance can also be used for damage severity measurement for incipient damage level in reinforced concrete structures. The surface-bonded single piezo configuration is found to be best in quantifying damage severity in terms of the equivalent stiffness parameter. Embedded single piezo configuration and metal wire single piezo configuration, on the other hand, correlate well with the global dynamic stiffness of the structure. Overall, the proposed integration enables an early detection of damage, its propagation and improved severity measurement for reinforced concrete structures, thus contributing to new application protocols.

A low-cost version of electro-mechanical impedance technique for damage detection in reinforced concrete structures using multiple piezo configurations

2016 ◽  
Vol 20 (8) ◽  
pp. 1247-1254 ◽  
Author(s):  
Naveet Kaur ◽  
Lingfang Li ◽  
Suresh Bhalla ◽  
Yong Xia
Keyword(s):  
Reinforced Concrete ◽  
Health Monitoring ◽  
Low Cost ◽  
Concrete Structures ◽  
Mechanical Impedance ◽  
Metal Wire ◽  
Reinforced Concrete Structures ◽  
Experimental Scheme ◽  
Impedance Technique ◽  
Lcr Meter

The electro-mechanical impedance technique has developed rapidly during the past few decades as a reliable health monitoring component of civil structures. However, the high cost of impedance analyzer/LCR meter conventionally used for data acquisition in the electro-mechanical impedance technique restricts its wide use in real applications. This article provides a comprehensive study of exploring the low-cost electro-mechanical impedance technique for health monitoring of concrete under destructive testing using multiple piezo configurations. The experimental scheme ensures separate acquisition of both the real and the imaginary components of the electro-mechanical impedance signature for detailed analysis, a feature not available in some previous low-cost adaptations. The piezo configurations covered here for comparison are the surface-bonded piezo configuration, the embedded piezo configuration, and the metal wire piezo configuration. The repeatability of the proposed low-cost electro-mechanical impedance technique is checked and the results are compared with the traditional counterpart utilizing conventional LCR meter. The two electro-mechanical impedance approaches show similar trends of the conductance signature for all configurations. In particular, the metal wire piezo configuration can be adopted as an excellent alternative in practice for reinforced concrete structures when the direct surface bonding is not feasible. Overall, the low-cost version of the electro-mechanical impedance technique is effective to detect the presence of the damage.

Building physiology information system for health monitoring in reinforced concrete structures

2012 ◽  
Vol 4 (2) ◽  
pp. 111-125 ◽  
Author(s):  
Chih-Yuan Chang ◽  
San-Shan Hung ◽  
Yu-Fang Peng ◽  
Wen-Te Chang ◽  
Hsin-Yi Feng
Keyword(s):  
Information System ◽  
Reinforced Concrete ◽  
Health Monitoring ◽  
Concrete Structures ◽  
Reinforced Concrete Structures

Design of precast reinforced concrete structures of frame buildings: a new set of rules

2019 ◽  
pp. 4-9 ◽  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Building Frames ◽  
Fine Grained ◽  
Rigid Frame ◽  
Floor Slabs ◽  
Frame Buildings ◽  
Spatial System ◽  
Precast Elements

Currently, prefabricated reinforced concrete structures are widely used for the construction of buildings of various functional purposes. In this regard, has been developed SP 356.1325800.2017 "Frame Reinforced Concrete Prefabricated Structures of Multi-Storey Buildings. Design Rules", which establishes requirements for the calculation and design of precast reinforced concrete structures of frame buildings of heavy, fine-grained and lightweight structural concrete for buildings with a height of not more than 75 m. The structure of the set of rules consists of eight sections and one annex. The document reviewed covers the design of multi-story framed beam structural systems, the elements of which are connected in a spatial system with rigid (partially compliant) or hinged joints and concreting of the joints between the surfaces of the abutting precast elements. The classification of structural schemes of building frames, which according to the method of accommodation of horizontal loads are divided into bracing, rigid frame bracing and framework, is presented. The list of structural elements, such as foundations, columns, crossbars, ribbed and hollow floor slabs and coatings, stiffness elements and external enclosing structures is given; detailed instructions for their design are provided. The scope of the developed set of rules includes all natural and climatic zones of the Russian Federation, except seismic areas with 7 or more points, as well as permafrost zones.

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