000019610 001__ 19610
000019610 005__ 20170118182328.0
000019610 04107 $$aeng
000019610 046__ $$k2017-01-09
000019610 100__ $$aHuber, Peter
000019610 24500 $$aSeismic Isolation of the Great Mosque of Algiers

000019610 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019610 260__ $$b
000019610 506__ $$arestricted
000019610 520__ $$2eng$$aThe Great Mosque of Algiers (Djamaâ El Djazïr) will be the third largest in the world and shall be completed in 2016/2017. The mosque building has a plan size of 145 x 145 m and a height of 65m while hosting up to 32,000 people. This main building was decided to be placed on 246 nos. seismic curved surface sliding isolators to mitigate the specified seismic PGA of 0.65 g. The isolation period of the system was chosen to be 3,1 s, to achieve sufficient reduction of incoming ground accelerations. The isolators must carry more than 27,000 kN each. The necessary damping for displacement limitation is provided by approx. 30 % from 3 % sliding friction within the isolators and by approx. 70 % from additional hydraulic dampers. This system limits the horizontal seismic displacements within a specified value of +/-500 mm, which was even magnified by the g x reliability factor of 1.2 (EC 8) to +/-600 mm. The additional 80 nos. hydraulic dampers with 2,500 kN capacity not only provide additional damping to limit the max. seismic displacements to 500 mm, but they allow a more smooth damping and shear force depending on the seismic impact. Thus the damping performance can be assumed to be adaptive. The dampers display a soft force development for velocities up to 400mm/s with a damping exponent of 0.4, what creates less response forces for minor to medium earthquakes. This characteristic was also not possible to be created alone – without dampers - by the applied curved surface sliders with defined high friction levels of approx. 8%, as the high friction would be always active – also for minor earthquakes and results in bad re-centring combined with great shear. For the maximum credible earthquake the dampers have been equipped with an integrated force limiter function starting from 1,000mm/s and being active up to 1,200mm/s in order not to overload the damper, the brackets, the anchoring or the structure. The CE marking and testing according to EN15129 in University of California San Diego and EU Center Pavia was a must for this project. A theoretical service life span of 500 years was proven by wear and fatigue testing. The author will present in this paper the design considerations and testing of curved surface sliders and hydraulic dampers to be applied within the huge Djamaâ El Djazïr Mosque in Algiers.

000019610 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019610 653__ $$acurved surface sliders, pendulum isolators, hydraulic dampers, structural isolation

000019610 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019610 720__ $$aHuber, Peter
000019610 8560_ $$ffischerc@itam.cas.cz
000019610 8564_ $$s1551330$$uhttps://invenio.itam.cas.cz/record/19610/files/40.pdf$$yOriginal version of the author's contribution as presented on USB, paper 40.
000019610 962__ $$r16048
000019610 980__ $$aPAPER