A modified strength capacity for composite slab using reliability approach
Design shear resistance coupled with lack of a probabilistic framework for the al- ternate deection requirement check for reinforced concrete (RC) slab, and the un- economical approach for pro_led composite slab strength determination are main challenges that contribute to design conservatism. Th...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2016
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| Online Access: | http://psasir.upm.edu.my/id/eprint/67064/1/FK%202016%20127%20IR.pdf http://psasir.upm.edu.my/id/eprint/67064/ |
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| Summary: | Design shear resistance coupled with lack of a probabilistic framework for the al-
ternate deection requirement check for reinforced concrete (RC) slab, and the un-
economical approach for pro_led composite slab strength determination are main
challenges that contribute to design conservatism. This thesis proposes to ad-
dress these challenges by implementing a rational- based approach in developing
schemes for limit state performance enhancement and a numerical function for
pro_led composite slab strength devoid of experimental procedure. Performance
enhancement schemes employs the probabilistic safety appraisal in providing im-
provement measures to the concrete shear resistance function and the provision for
a simpli_ed probabilistic deection check while maintaining an acceptable closed
form solution. Hence, variable deection, _defl and shear resistance, _prop factors
are introduced to modify the existing limit state. Similarly, a procedural algorithm
lead to the development of pro_led composite slab strength determination function
for both longitudinal shear estimation methods by considering section slenderness
and deck characteristics. First, composite deck safety performance against the
load ratio function leads to safety bounds de_nitions that takes into consideration
section slenderness and sheeting deck characteristics values delineated through l=6
and l=8, culminating in the formation of modi_ed strength function. The proba-
bilistic based optimisation scheme shows potentials to improve RC slab design by
suggesting 4% design moment reduction. Similarly, the concrete shear capacity can
be increased signi_cantly with an enhancement _prop factor of 2.0, and a similar
_defl value of 5.15 is also proposed to shore up the limiting deection requirement
check under the use of a concrete strength class of 30 MPa. Furthermore, the
developed strength determination effectively performs well in mimicking the prob-
abilistic deck performance and composite slab strength determination that shows
improvement in strength load estimation difference between the two longitudinal
shear methods to 12% from 26%. The strength test performance between the developed scheme and the experiment based test results indicates high similarity,
demonstrating the viability of the proposed strength determination methodology
developed in this study. |
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