Study on the interfacial shear behavior of steel reinforced concrete (SRC) members with stud connectors after fire

doi:10.1007/s11709-014-0250-1

Front. Struct. Civ. Eng.

2014, Vol. 8

Issue (2) : 140-150 https://doi.org/10.1007/s11709-014-0250-1

RESEARCH ARTICLE

Study on the interfacial shear behavior of steel reinforced concrete (SRC) members with stud connectors after fire

Zihua ZHANG,Junhua LI(

),Lei ZHANG,Kai YU

College of Civil Engineering and Environment, Ningbo University, Ningbo 315211, China

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Abstract

Statically push-out tests of 20 steel reinforced concrete short columns (SRCSC) with stud connectors on the surface of shape steel after fire and two SRCSC under ambient temperature were carried out, in order to study the failure mode, load-slip relationship and the interfacial shear transfer of SRC members after fire. Experimental results show that the typical failure modes and load-slip curves of SRCSC after fire are almost the same as the case under ambient temperature. The interfacial shear transfer of SRCSC declines exponentially not only with the increase of the peak temperature the specimen experienced but also with the increase of the peak temperature duration. The interfacial shear transfer of the specimens with studs arranged at the steel web is much higher than those with studs arranged at the steel flange. Empirical formulas of SRCSC interfacial shear transfer after fire are proposed, and the calculated results generally agree well with the experimental results.

Keywords steel reinforced concrete (SRC) short column stud connector after fire interfacial shear transfer

Corresponding Author(s): Junhua LI

Issue Date: 19 May 2014

Cite this article:

Zihua ZHANG,Junhua LI,Lei ZHANG, et al. Study on the interfacial shear behavior of steel reinforced concrete (SRC) members with stud connectors after fire[J]. Front. Struct. Civ. Eng., 2014, 8(2): 140-150.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-014-0250-1
https://academic.hep.com.cn/fsce/EN/Y2014/V8/I2/140

Fig.1 Dimensions and shape steel configuration of the specimen

Tab.1 Parameter design of specimens

Fig.2 Thermocouple locations in specimen section

Tab.2 Results of tensile tests

Fig.3 Experimental stove and its temperature control system

Fig.4 Heating-curves of the stove

Fig.5 Temperature rising curves in the specimen

Fig.6 Test setup

Fig.7 Typical failure mode of the specimen

Fig.8 Typical cracks at the specimen ends. (a) Studs arranged at the steel flange; (b) Studs arranged at the steel web

Fig.9 Load-slip curves of specimens. (a) SRC-1; (b) SRC-2; (c) SRC-3; (d) SRC-4; (e) SRC-5; (f) SRC-6; (g) SRC-7; (h) SRC-8; (i) SRC-9; (j) SRC-10; (k) SRC-11; (l) SRC-12; (m) SRC-13; (n) SRC-14; (o) SRC-15; (p) SRC-16; (q) SRC-17; (r) SRC-18; (s) SRC-19; (t) SRC-20; (u) SRC-21

Fig.10 Effect of peak temperature on the load-slip curves. (a) At flange, anchorage length= 400 mm, duration= 30 min; (b) At flange, anchorage length= 600 mm, duration= 30 min; (c) At web, anchorage length= 400 mm, duration= 30 min

Fig.11 Effect of the peak temperature duration on the load-slip curves. (a) At flange, anchorage length= 400 mm, peak temperature= 400°C; (b) At flange, anchorage length= 400 mm, peak temperature= 400°C; (c) At web, anchorage length= 400 mm, peak temperature= 400°C

Fig.12 Effect of stud position on the load-slip curve. (a) Anchorage length= 400 mm, peak temperature= 200°C, duration= 30 min; (b) Anchorage length= 400 mm, peak temperature= 400°C, duration= 30 min

Fig.13 Effect of the anchorage length of the shape steel on the load-slip curves. (a) At flange, peak temperature= 400°C, duration= 30 min; (b) At flange, peak temperature= 600°C, duration= 30 min

Fig.14 Relationship between the shear transfer capacity and the peak temperature. (a) At flange, duration= 30 min; (b) At web, duration= 30 min

Fig.15 Relationship between the shear transfer and the peak temperature duration. (a) At flange, peak temperature= 400°C; (b) At web, peak temperature= 400°C

Tab.3 Comparison of calculated interfacial shear transfer and test results

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