Abstract
Under high gravity loads, steel double-beam floor systems need to be reinforced by beam-end concrete panels to reduce the material quantity since rotational constraints from the concrete panel can decrease the moment demand by inducing a negative moment at the ends of the beams. However, the optimal design process for the material quantity of steel beams requires a time-consuming iterative analysis for the entire floor system while especially keeping in consideration the rotational constraints in composite connections between the concrete panel and steel beams. This study aimed to develop an optimal design method with the LM (Length-Moment) index for the steel double-beam floor system to minimize material quantity without the iterative design process. The LM index is an indicator that can select a minimum cross-section of the steel beams in consideration of the flexural strength by lateral-torsional buckling. To verify the proposed design method, the material quantities between the proposed and code-based design methods were compared at various gravity loads. The proposed design method successfully optimized the material quantity of the steel double-beam floor systems without the iterative analysis by simply choosing the LM index of the steel beams that can minimize objective function while satisfying the safety-related constraint conditions. In particular, under the high gravity loads, the proposed design method was superb at providing a quantity-optimized design option. Thus, the proposed optimal design method can be an alternative for designing the steel double-beam floor system.
Highlights
In downtown areas with a high density of buildings, the construction of new buildings with underground spaces is on the rise to efficiently use the limited areas
In the steel double-beam floor system, the concrete panel should have an appropriate thickness to induce the rotational constraints required for a code-conforming rigid connection in the ends of the double-beam
An optimal design method was developed to solve the iterative design problem of steel double-beam floor systems considering the beam-end constraints induced by the concrete panels
Summary
In downtown areas with a high density of buildings, the construction of new buildings with underground spaces is on the rise to efficiently use the limited areas. The initially developed steel-concrete composite floor systems [12,13] were aimed at reducing the floor height and improve the constructability, so beam-column connections were pinned using bolts. These composite floor systems were ineffective in the reduction of material quantity when the moment demand generated at the center of the beam significantly increased due to a high load. AA nneeww iinnddeexx,, nnaammeedd tthhee LLMM ((LLeennggtthh--MMoommeenntt)) iinnddeexx,, rreeggaarrddiinngg tthhee ddeessiiggnn ppaarraammeetteerr ooff sstteeeellbbeeaammiiss uusseedd ttoo ccoonnssiiddeerr bbootthh mmaatteerriiaall qquuaannttiittyy aanndd ssttrruuccttuurraall ssaaffeettyy ffoorr tthhee ddeessiiggnn ccoonnddiittiioonnssooffththeeuunndderegrgroruounnddspsapcaecseus suesdedasaaspaarpkairnkginlogt.loFto.rFfiovrefilivvee lliovaedlsotaadksintgakinintog aincctoouancctotuhnetuthsaeguesaogfethofetuhenduenrdgerrogurnodunsdpaspceasc,etsh, ethfeefaesaibsiibliitlyityofofththeeddeevveellooppeedd ddeessiiggnn mmeetthhooddisisvvereirfiifiededbybycocmompaprainrginigt wititwhitthhetmheatmeraiatel rqiualanqtuitayntthitayt itshdatesiisgdneesdigbnyetdhebcyodtheebcaosdeed-bdaesseidgndemseigthnomd.etIhnoadd.dIintiaodnd, tihtieonst,rtuhcetustrraulcetfufreaclt eofffethcteorfotthaetiorontaalticoonnasltrcaoinnststrfarionmts from the concrete panel is environmentally quantified by evaluating the global warming potential (GWP) based on the design proposals derived from the proposed design method.
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