CIVIL AND PROJECT JOURNAL
Year:2019 | Volume:1 | Issue:3 |Papers Count:6

Due to the complexity of loads applied to wharves and piers because of their special application as mooring and berthing structures, their design always has many challenges. These structures have a large mass, and the piles and pile caps connections must sustain large inelastic deformations during major earthquakes which force-based design method cannot consider properly. So this study was undertaken to evaluate the full seismic performance of a typical synchrolift wharf located at Hormozgan province with performance-based design method by a series of static pushover analyses for three different hazard levels in accordance with ASCE/COPRI 61-14 code requirements and local seismicity. Soil-structure interaction, material overstrength, and site-specific response spectra were used to determine the displacement demands. The results reveal that using conventional force-based design method leads to the unreliable deck as well as uneconomical pile foundation designs.

The subject of passive defense in the universe is as old as the history of human life. Non-operational defense is a set of unarmed actions that increase their deterrence, reduce vulnerability, enhance national security, continue essential activities, and facilitate crisis management against enemy threats and military action. Given the importance of contractors' knowledge of how contractors are monitored and monitored, it is important to properly implement non-operating defense principles in military projects. This study is a case study of civil engineering contractors trying to assess the extent to which contractors adhere to non-operating defenses as well as how employers are supervised and supervised by contractors.

The importance of using concrete as the main material in the construction of structures seems obvious. Due to the high cost of repairs, their durability is of particular importance. Permeability is the most important factor in reducing the durability of structures so that resistance to concrete permeability is the first factor in determining the service life of a structure. . Since long time, researchers and civil engineers and metallurgists have been looking for additives to help them improve the mechanical properties of concrete and have made many successes. In addition to additives such as nano, the effect of exterior materials such as polyurethane paint on the durability of concrete can be investigated. Replacing part of the cement with filler material has been the idea of many recent studies. Numerous reports indicate the use of these materials to improve the mechanical properties of concrete. Most attention has been focused on the use of silica. The aim of this study was to investigate the effect of polyurethane paint on self-compacting concrete containing methacrylene and silica on durability of concrete used in structures.

The construction industry is one of the most important users of nanostructured materials due to its requirements in terms of strength, durability and high performance. The nanosilica and nanomaterials are discussed and the results of the new state experiments of slump current, T50, hopper time V, and box L are investigated. According to the results for all the designs made in this project, the slump flow is reduced compared to the control sample. With nanomaterials, this slump reduction is much more visible. Also, due to the slump decrease in T50 time by adding nanomaterials, we observed that by adding nanomaterials, this increase is longer than the designs containing nano-silica and in this study the funneling time is increased by adding nanomaterials, which increases in the samples containing Nano-copper is much clearer.

The purpose of this study was to investigate the compressive strength and permeability of polyurethane-containing and non-dyed concrete containing methacrylene and silica. The compressive strength of all designs increased with increasing age of concrete compared to the control. As the percentage of nanosilica increased, this increase was maintained and increased to 2%. We also see a 1% replacement resistance in nanosized designs. However, in the replacement designs of 3% nano silica and 3% nano copper at 90 days of age, resistance to control samples was reduced. The permeability test results show that at 28 days old nano-copper up to 2% and nano-silica up to 3% is a better replacement and performs better by increasing the concrete age to 90 days nano-copper.

The importance of properly evaluating the strength of the concrete against the penetration of chlorine ions to achieve durable structures is highlighted. Different laboratory methods have been developed to determine the phenomenon of migration and diffusion of chlorine ions into the concrete mass. In this study, chlorine ion penetration decreased in samples containing nanosilica and nanomaterials. Decreasing the chlorine ion penetration means more resistance to penetration in concrete, which is higher in samples containing nano-copper than nano-silica. By adding polyurethane paint to the sample, chlorine ion penetration was reduced in all samples.