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Abstract
Assessment of old factory infrastructure is required in order to keep them working especially after natural hazard event such as earthquake, tornados, or variation of gravity loads. This type of structure is considered essential since it should be safety for workers during operation time and to avoid possible economical losses if this facility stops its operations after any main seismic event. It is presented the structural assessment of the infrastructure of a melt shop facility, which it used for production of structural steel shapes. This infrastructure was built at the beginning of 80’s and it is located at near Pisco city in Peru. Reinforced concrete C columns and L beams make the frames of the structure and the rood is made by steel trusts. NDT and destructive tests were made for the reinforced concrete members as well of extraction of steel coupons from the roof trusts. Auscultation of foundation, reinforced concrete and steel structures were performed. It was found that several columns present damages such as spalling of cover, impact hits from heavy vehicles, which get in the interior of the facility. The roof presents metallic dust which was accumulated by the smelter operation. Heat of 50 Celsius degrees is the average temperature during the 20hours per day of operation time. Besides, capacity of several reinforced concrete columns and beams, and steel members of the roof is minor that their demands respectively according to Peru and international codes. The performance of the full structure of the melt shop including concrete and steel structures presents allowed drifts according seismic provisions, however this structure behaves on its nonlinear range under demands of Peru seismic code.
Highlights
Due1.theIsNeTRciOrcDuUmCsTtaIOnNces, the owner of this facility commissioned the structural seismic evaluation to the coTnhseulmtaenlt-sehnogpinfeaecriliintygisfilromcaHteAdTCThHeisne otrrudsesrestoaraes3s0esms thleencgaptha,cwityhoicfhtrheecceuivreretnhtecloonacdreotfehaenadvystpeieplestsryusctteumres fofrocruerxretrnatcltoioandsodf guaesnferowmetxhtenmsieolnt oafnsdteaeplpalriceaataiotnthoef neinwtelroioardso.f tFhigeufraeci1litsyh.aotwdsisttrhicet ocuf rPriesncot,vdiewparotmf ethnet moelftsIchaopin
The structure consists of reinforced concrete frames and steel roof, which it is used to the melt metal in order to make new structural steel shapes
It was studied the location for worse case scenarios from crane loads to concrete frames when 2 cranes works at the same time
Summary
Linear static and dynamic structural analyses were performed using SAP2000 software. Two models were developed, one for the steel roof independently, and other for the concrete structure which carries la load from that roof which was modeled using equivalent members, which replace the trusses of that steel roof. For the computational model to the roof, line elements were used to idealize the elements of the trusses and a 3D model was built, taking special care to add every truss element to have a reliable response of behavior of the structure and its loads transmission It was taken into account the location of every shape on its respective axis and orientation of local axes. Regarding the steel roof above the concrete frames, this provides a partially flexible diaphragm as observed in the auscultation as in its analysis This can distribute forces of gravity and lateral forces according to the axial and flexural rigidity of roof and horizontal elements, especially the naves parallel to the longitudinal direction of the roof and the diagonals in the horizontal plane of the roof. Figure 14. 3D views of the Global Model of the building to be evaluated. (Source:Own)
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