# Vibration Signal Diagnostic Information of Reinforced Masony Elements Destruction
## 3 Measurement Systems  
The measurements of the vibration signal parameters were carried out using the APB-200 measurement and processing package included in the CADA-PC software. In a specific place of signal reception on the tested wall element, justified by the nature of the loads in the real walls of the building, a vibration signal was recorded in the form of a vibration acceleration amplitude. The vibration transducer was mounted in the middle of the tested segment, and the vibrations were forced with a modal hammer on the other side, each time for the recommended compressive load.  
The modal test was carried out by forcing the samples to vibrate with a modal hammer. The SISO method was used in which the strokes were made at one point and the location of the response was recorded, the signal of which was received with the help of a glued piezoelectric sensor on a given wall of the sample.  
SIEMENS LMS Test.Xpress measuring equipment (Figure 6) was used to measure the time histories of system excitations and responses. This software makes it easy to carry out a modal analysis of brick elements as well as any other building structures.  
Figure 4: Masonry segment made of ceramic bricks, cross-section \(12\times 25\) cm, reinforced with a steel mesh: (**a**) from preparation; (**b**) under load; (**c**) destruction.  
Figure 5: Masonry segment of ceramic bricks, cross-section \(12\times 25\) cm, reinforced with Ruredil mesh (**a**) from preparation; (**b**) under load; (**c**) destruction.  
Figure 6: SIEMENS LMS Test.Xpress measuring equipment.  
As a result of the tests, the time courses of the excitation force (modal hammer) and the time courses of responses (piezoelectric sensor) were obtained, and their visualizations are presented in Figure 7.  
The SIEMENS LMS SCADAS Recorder system is one of the most advanced measurement systems, which uses modal analysis methodology in the research of material degradation. This device is compatible with professional engineering software (Figure 8).  
SIEMENS LMS Test.Lab is a measurement system used for data acquisition, analysis and reporting. It includes structural and acoustic testing dedicated procedures, environmental testing and quality testing. It is used to provide data collected on real objects, and it integrates them into the simulation process. These data are described in time waveforms, stabilization diagrams, cross-power waveforms, etc. [17; 28].  
The condition of masonry elements should be tested via a simple and effective method, using the minimum number of measurements. This software can be used to easily conduct the modal analysis of masonry elements and any other building structures according to the developed degradation state analysis algorithm.  
Figure 8: SIEMENS LMS SCADAS Recorder.  
Figure 7: Example view of measuring the time course of the vibration response as a function of time during the registration of measurements in the SIEMENS LMS Test.Xpress v.4.1 software.  
Correct measurement depends on obtaining the level of the exciting force that was previously determined and on the appropriate level of the response signal. Repeatable tests of waveforms concerning the measure of changes in material destruction states are the biggest advantages of the SIEMENS LMS measurement system.