Abstract
Flexural stiffness or effective width of floor slab acting as coupling beam is very important for the analysis of Coupled Shear Wall (CSW) systems. New generation of high performance concretes provide an alternative to conventional concrete to enhance the performance of coupling slabs. This research investigates the flexural behaviour of coupling slabs incorporating Engineered Cementitious Composite (ECC) compared to conventional Self-Consolidating Concrete (SCC). The high strain capacity and low crack width makes ECC an ideal material for coupling slab. Non-linear coupling action of ECC slabs is investigated experimentally with small-scale models having variable geometric parameters under monotonic loading. The performance is judged based on moment-rotation response, flexural stiffness/effective width, deflection, cracking, strain development and failure modes. Design charts for flexural stiffness/effective width of coupling slabs are presented in pre-cracking/cracking/post-yielding stages. CSW systems with ECC are found stronger and ductile than their SCC counterparts confirming the viability of constructing such structures.
Highlights
In any multi-story building, an efficient structural system should resist lateral forces due to wind, earthquake and must prevent excessive deflections
Small scale Coupled Shear Wall (CSW) models of approximately 1/12th scale made of reinforced High Performance Concrete (HPC) such as Engineered Cementitious Composite (ECC) and Self-Consolidating Concrete (SCC) are tested under monotonic loading
The performance ECC and SCC coupling slabs is compared based on load-deflection/moment-rotation response, stressstrain development in steel/high performance concrete (HPC), strength, ductility, cracking characteristics and failure modes
Summary
In any multi-story building, an efficient structural system should resist lateral forces due to wind, earthquake and must prevent excessive deflections. This chapter describes the development of a test set-up and its working principle to carry out small scale model tests of 1/12th scale simulating flexural behaviour of coupling slabs in shear wall structures. It describes testing procedures, model instrumentations, geometric dimensions of models, design of reinforcement, mix design/material properties of ECC and SCC, steel properties and casting/curing of model specimens. We present an analysis of test results based on load-displacement response, strain development in steel and concrete, cracking and failure modes of CSW model specimens to study the influence geometric parameters and type of HPCs namely SCC and ECC. The load-displacement or moment-rotation response curve plays a very important role in determining the bending/flexural stiffness and effective width of the coupling slab in CSW system. The portion beyond ‘D’ indicated postpeak model response with point ‘D’ representing peak or ultimate load/moment carrying capacity of the structure
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