Misan Journal of Engineering Sciences

Post-fire analysis of a six-story square steel building under the action of dynamic wind
forces in the south of Iraq is presented. The nonlinear time-history analysis using direct integration
method is accomplished by SAP 2000 V16 program while geometric nonlinear parameters are
included. The post fire deformations values and their configurations along building are based on
available literature that related to post fire deformations of steel buildings at 550oCwith reducing of
yield stress and modulus of elasticity) by 10% due to fire. In the present study, two post fire
scenarios are considered, with wind speed of 42 m/s, according to Iraqi meteorological and IQS.301
standards. The aim of this study is to investigate the post-fire dynamic analysis of a multi-story steel
moment-resisting building subjected to dynamic along-wind loads. Variations of base shear, base
moment, drift ratio, and displacement are considered for discussion and comparison. Its concluded
that the presence of deformation in building after fire and the reduction in yield stress and modulus
of elasticity increased the base shear, base moment and drift ratio as average by about 12.5, 20&
64%respectively under the effect wind load. The fire deformations may be critical and the structural
decision for the building safety should be done via structural analysis of the building taking into
consideration different parameters related to post fire effects.

This paper presents an experimental study of simply supported ferrocement timber composite members. An
adherently bound link is investigated. As a shear connector layer, an appropriate length for this type of composite beam was
chosen to study the effect of shear strength on the impact of one point load (1.2 m). Sikadur 31 thixotropic epoxy resin
adhesive is used. The research's primary goal is to collect data and provide information on the structural behavior of proposed
ferrocement timber composite (FTC) beams. The thickness and width of timber beams, the presence and absence of a bonding
layer on the shear connector, and the influence of sagging and hogging bending moments were also investigated. FTC beams
are a relatively new civil engineering solution, and their behavior should be investigated to develop relevant methods for
calculating their resistance. Two push-out tests were used to tentatively resolve the connector's slip and pinnacle load limits.
The stiffness and strength of the connection utilized to bind a ferrocement slab to a timber beam were investigated by the
authors. These criteria are critical for composite beam planning because the solidity and quality of a composite beam
framework's connections determine its performance. A three-point loading test was performed on the composite beam
specimens. Measurements also demonstrate that the connection is near-perfect because the slide is minimal during the test
(except at failure). Converting from sagging to It has been witnessed that converting from sagging to hogging
bending reduces the ultimate load by up to 24%. The suggested beams' loading It has been witnessed that
Converting from sagging to hogging bending reduces the ultimate load by up to 24%.shown to be excellent when
compared to their weight in tests. Epoxy resin (Sikadur 31) can be used to provide adequate bonding between the
components. The highest gain in the loading capacity was 48% when the timber thickness was increased from 90 to 190
mm.

Residential consumers can efficiently engage in demand response programs with the help
of home energy management systems (HEMSs). The best scheduling of gas, oil, coal, and uranium
appliances has yet to be considered by traditional HEMSs, which exclusively control domestic electric
devices to lower the cost of electricity usage. The associated demand response (DR) for smart homes
is then adjusted to lessen the difference between predicted and actual demand after comparing the
actual price to this forecast. Data acquired by Nordpool and publicly available energy information
have been used to test the proposed strategy about price demand forecast and DR management. The
function is to reduce energy costs for the home and the dissatisfaction brought on by moving, cutting,
and replacing loads by changing prices over time. Case studies with accurate data show that the
suggested strategy can return on investment bills by up to 85% while maintaining their satisfaction.

This paper presents an experimental investigation of the mechanical characteristics of
Reactive Powder Concrete (RPC) and Recycled Aggregate Reactive Powder Concrete (RPC-RA),
utilizing two types of recycled aggregate (RA), recycled concrete aggregate (RCA), and recycled
concrete brick aggregate (RCBA) as alternative aggregates. A series of sixteen RPC and RPC-RA
mixes were prepared and tested. A reference RPC mix without RA was tested to determine the
maximum compressive strength of 128.17 MPa, the tensile strength of 15.56 MPa, and the flexural
strength of 25.90 MPa. Then, the study examines twelve different mixes of RPC-RA, each with RCA
with maximum particle sizes of 0.6, 1.18, 2.36, and 4.75 mm and replacement ratios of 20%, 40%,
and 60%, to study the effects of varying replacement ratios of the RCA and various maximum particle
sizes. Additionally, three mixes of RPC-RA are investigated using RCBA with a maximum particle
size of 0.6 mm and replacement ratios of 20%, 40%, and 60%. The use of RA resulted in various
percentages of reduction in compressive, splitting, and flexural strength, as shown in the results of the
study.

This study inspects the structural behavior of composite steel concrete beams connected
together by Y-Rib shear connectors using recycled concrete. The main method involves using stud
shear connectors with normal concrete. By comparing the structural performance of Y-Rib shear
connectors with conventional stud shear connectors, the study aims to determine the benefit of using
this type of connector with recycled concrete. Improved results in terms of maximum load-bearing
capacity before failure and maintaining structural integrity until failure would indicate a viable solution
to the sliding issue seen in traditional composite beams. Regardless of challenges in acquiring
traditional shear connectors, the study also explores an alternative: 20mm diameter reinforcing bars.
Although this falls outside the primary research scope, the main focus remains on the behavior of
composite beams connected by Y-shaped shear connectors with recycled concrete. The investigation
encompasses 18 shear connector types, divided into two groups: 9 models with normal coarse aggregate
concrete (35.17 MPa) and 9 models with recycled coarse aggregate concrete (33.48 MPa) to determine
the benefit of recycled aggregate concrete usage.

In some construction industries, there are difficulties in achieving the required concrete
compaction, Self-compaction is an alternative option. Working with self-compaction self-curing
concrete requires a unique approach. This study aims to examine the possibility of producing self-
compacting concrete with normal and high self-cure rates. This research observed how both the self-
curing and self-compacting concrete behaved under normal and high-strength conditions. Two stages
were prepared for this investigation. The first stage of this research studied the effect of a curing agent
on the fundamental characteristics of both normal-strength and high-strength self-compacting concrete,
with the aim of achieving self-curing self-compacting concrete. The primary variables of this study
include the grade of concrete, the type of curing agent, the reinforcing bars, and the dosage of these
variables. In the second stage, reinforced concrete beams were cast with one of the two proposed
concrete types, and their behavior was studied. The findings were analyzed in terms of the beginning
cracking loads, the ultimate loads, and the crack patterns of the testing beams. According to the results,
both the normal-strength and the high-strength varieties of self-curing self-compacting concrete are
effective in providing structural features, which are absent from the processes of curing and compacting.
Curing chemicals are utilized to mitigate the process of water evaporation in self-compacting concrete,
hence enhancing the water retention capabilities of self-compacting concretes that possess enough
hardened concrete characteristics.