The present work is dedicated to the study the effect of the applied loads on the behavior of top-set angle with double web angle bolted metal beam-to-column (TSA-DWA) connection. A numerical study of finite elements for the characterization of the nonlinear behavior of metal connections types carbon steel ASTM A36 mild steel with screw fasteners. The numerical analysis is based on a three-dimensional model with 3D solid brick element, each element consists of eight nodes using the software of finite elements ABAQUS. The model takes into account material and geometric nonlinearities (contact, plasticity, large displacements). This model has calibrated on the basis of experimental results two connections with different geometric configurations. In addition, to validate the model developed.

Bandar-e-Anzali is located among many active faults in Guilan Province in the north of Iran, and seismologically is one of the active regions of Iran. Numerous severe historical and instrumental earthquakes, including three earthquakes with magnitude more than 7 in this region, can be an evidence of this claim. The objective of this paper is to estimate acceleration coefficient for different levels of seismic activities within the city surrounding area. For this purpose, a list of major faults, as well as the reported historical and instrumental earthquakes occurred within a radius of 200 km around the area, till 2013 A.D. are collected. In this paper, after culling and removing aftershocks and foreshocks, first the Poisson behavior of the remaining earthquakes is studied; and then by calculating the frequency of earthquakes and using universal probabilistic relationships, the seismicity parameters of this region is obtained. Finally, the site-specific response spectra and the peak ground acceleration coefficients for this city and suburbs are obtained using SeisRisk III hazard analysis program. The results of this study show that the active seismicity in the south area of this city is much more than its northern parts.

Gullies proliferate the landscape of the Ajalli Sandstones (AS) geological formation in the North Central Nigeria. This study was carried out to assess the vulnerability to gully erosion of the Ajalli Sandstones geological sediments, and to examine the relationship between gully length and average gully sediment volume on this formation. Soil samples, collected from each sidewall of 15 gully erosion sites at two depth ranges, the rilling depth, d1 (0 – 60 cm) and the gullying depth, d2 (60 – 120 cm), were tested to determine their particle size distribution using the hydrometer method as well as compute their erodibility indices (K). Further, samples were collected using sampling tubes to determine the soils’ dry bulk density (DBD). Additionally, 37 gullies developed on the AS formation were measured to determine their lengths (L), average widths (W), and average depths (D). From each gully, three additional variables of average gully sediment volume (V), average cross sectional area (A), and average form factor (W/D) were computed. For the two respective depth ranges, the particle size distributions, the K values, and the DBD as well as the sets of six variables of L, W, D, C, A, and W/D from each gully were analysed using descriptive statistics. And the pairs of L and V for each gully were further analysed using inferential statistics to examine their relationship. Results show that the rilling depth (d1) and the gullying depth (d2) are both highly erodible with the mean %sand d1 + %siltd1 = 95%, %clayd1 = 5%, Kd1 = 24.40, and DBDd1 = 1.31 g/cm3; and the mean %sandd2 + %siltd2 = 82%, %clayd2 = 18%, Kd2 = 8.40, and DBDd2 = 1.34 g/cm3. The cross sectional shape of the gullies formed on the AS is trapezoidal. The mean W/D ratio on this formation is 1.46. This shows that the surface soil is eroding faster than the subsurface soil. The length is significantly, positively, but moderately correlated with the average sediment volume. And a simple bivariate regression shows that the relationship between gully length and the average gully sediment volume is of the form: V = 27,066.643 + 147.213L (R = 0.503, R2 x 100 = 25.30%). The study also shows that gully length is a moderate predictor of average sediment volume on homogeneous, erodible formations.

Urban transformation, after as one of the century's greatest disaster for Turkey called 17 August 1999 Marmara and 12 November 1999 earthquake in Duzce occupies places of the country's agenda. These earthquakes have shown that the majority of structures are in danger. In this context; with the idea that it would be difficult to demolish and rebuild each building individually, some regulations were adopted from time to time in the country and field based transformation studies were encouraged. However, in one of the most important metropolises of the world such as Istanbul, to make a transformation process in accordance with international standards; due to the city's history, crowdedness, the bad urbanization made up to now for individual earnings, does not seem easy. In this study, information about the urban transformation studies have been performed until recently in Turkey are given. By evaluating the results, suggestions have been made on how to make a transformation planning.

Shape and grading of aggregates can influence concrete workability. The volumes of water for well graded and poorly graded vary along with cementations materials are commonly increased to adjust. The basic purpose of this paper is to show that by properly selection of aggregates and changing mixture proportions, the proportion of cementations materials provided for workability can be minimized while achieving suitable workability and strength properties. In this research study of strength properties of high Performance concrete is achieved by using diverse characteristics of aggregate and the results obtained from laboratory testing of concrete having varying aggregate characteristics. By the purpose of this work, two types of coarse aggregates have been used. The fine aggregate is normal sand obtained from a locally available (BHOLARI /JAMSHORO AREA Latitude: 25.317. Longitude: 68.217 AND 25.416868, longitude is 68.274307. Jamshoro, Pakistan) initial laboratory investigation was conducted to obtain the suitability of using the aggregates for construction work. The various tests conducted include sieve analysis, bulk density, and specific gravity. ASTM mix design was adopted for this work and mix compositions were calculated by absolute volume method. For each and every type of coarse aggregate 25 numbers cubes (150x150x150mm) were cast to allow the compressive strength to be monitored at. 56 days. Test result reveals that concrete made from a type aggregate has higher compressive strength.