A simplified method for predicting early-age stresses in slabs of steel-concrete composite beams in partial interaction

被引:25
作者
Bertagnoli, Gabriele [1 ]
Gino, Diego [1 ]
Martinelli, Enzo [2 ]
机构
[1] Politecn Torino, DISEG Dept Struct Geotech & Bldg Engn, Turin, Italy
[2] Univ Salerno, DICiv Dept Civil Engn, Via Giovanni Paolo 2, I-84084 Fisciano, SA, Italy
关键词
Steel-concrete composite beams; Partial interaction; Early-age concrete; Shrinkage; LONG-TERM; CRACKING;
D O I
10.1016/j.engstruct.2017.02.058
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Thermal effects due to the heat produced by cement reaction and shrinkage deformations affecting concrete generally results in stresses that can lead to early age cracking in the concrete slab of composite beams. This work provides a simplified approach for determining the time evolution of stresses developing at early age in curing concrete slabs of composite beams. Specifically, the method generally used in practice and based on a simple sectional analysis is extended to the case of steel-concrete composite beams in partial interaction. The time evolution of the force-slip relationship characterising the shear connector response as a result of the concrete curing process is also taken into account by means of a simple assumption corroborated by some experimental results available in the literature. The results obtained by applying the two proposed methods are compared to those achieved by means of the general practice-oriented procedure. Different types of cement, featuring a variable time evolution of the hydration process, are taken into account. Moreover, the effect of different external temperature at casting is also considered. It is worth highlighting that the proposed method enhances the predicting capability of the current practical ones, with almost no increase in calculation effort. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:286 / 297
页数:12
相关论文
共 27 条
[1]   Full-scale long-term and ultimate experiments of simply-supported composite beams with steel deck [J].
Al-deen, Safat ;
Ranzi, Gianluca ;
Vrcelj, Zora .
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, 2011, 67 (10) :1658-1676
[2]   Numerical modelling of early-age concrete hardening [J].
Bertagnoli, G. ;
Mancini, G. ;
Tondolo, F. .
MAGAZINE OF CONCRETE RESEARCH, 2009, 61 (04) :299-307
[3]  
Bertagnoli G, 2015, P 16 EUR BRIDG C
[4]   Early age cracking of massive concrete piers [J].
Bertagnoli, Gabriele ;
Mancini, Giuseppe ;
Tondolo, Francesco .
MAGAZINE OF CONCRETE RESEARCH, 2011, 63 (10) :723-736
[5]   TIME-DEPENDENT STRESSES AND DEFORMATIONS IN PROPPED COMPOSITE BEAMS [J].
BRADFORD, MA ;
GILBERT, RI .
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-STRUCTURES AND BUILDINGS, 1992, 94 (03) :315-322
[6]  
CEN, 2004, 199411 CEN EN
[7]  
CEN Comite Europeen de Normalisation, 2005, 19942 CEN EN
[8]  
Colonnetti G., 1950, Q APPL MATH, VVIII
[9]  
Davaine L, 2007, GUIDANCE BOOK EUROCO
[10]  
Ducret JM., 1997, IABSE REPORTS, V999