Experimental Investigation

The model of the mosque was constructed to a length scale of 1:6 according to the "gravity forces neglected" modeling principle, using the same materials as those of the prototype: stone, bricks and lime mortar (Gra-matikov et al. 2007). The experimental testing was performed on the bi-axial seismic shaking table at the IZIIS' Laboratory. Following the main objective, the testing was performed in three phases:

1) Testing of the original model for low intensity level, to provoke small damage;

2) Testing of repaired model and strengthened minaret with FRP, until total collapse of the minaret;

3) Testing of strengthened model with FRP and carbon fiber bars until collapse.

Section 6

Section 6

Figure 1. Dimensions and instrumentation of the large scale model of Mustafa Pasha Mosque.

Figure 1. Dimensions and instrumentation of the large scale model of Mustafa Pasha Mosque.

To investigate models' response during seismic action different types of transducers were placed at characteristic points - accelerometers, linear potentiometers and LVDTs, as shown in Figure 1 (Krstevska et al. 2007).

2.1 Phase 1 - Testing of the original model

Before starting the seismic testing, the dynamic characteristics of the model were defined by means of ambient vibration method as well as by low intensity random excitation within the frequency range of 0.1-50 Hz. The accelerogram of the Montenegro earthquake of 1979 (Petrovac N-S component) was selected as a representative earthquake excitation.

The earthquake time histories were scaled (compressed) 6 times, according to the similitude requirements and several tests were performed with intensity of0.01-0.10g.

Under input intensity of 2%g, the first horizontal crack appeared at the base of the minaret. In the next tests performed under intensities of up to 10% g, damage occurred on the mosque, too. The reason of this was the frequency content of the applied excitation, which was close to the natural frequencies of both the minaret and the mosque.

Figure 2. Damage to the minaret (horizontal crack) and of the mosque after phase 1.

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