Connections using grouted sleeves remain a popular option for precast elements because of their relative ease of construction, but existing knowledge about the seismic performance of such connections is incomplete and poorly understood. In particular, the effects of the grouted splices are intensively studied in this paper. The main objectives of this study are to examine the influence of axial compression ratio on the strain distribution and shearing deformation in the plastic hinge zones based on full-scale experimental results, as well as to discover the flexural strengths of local grouted sleeve and normal cross-section and evaluate the deformation of precast columns based on modified plastic hinge models. Analysis results demonstrated the following: (1) strain and shearing deformation exhibited that the grouted sleeve has good connection performance, but the existing grouted sleeve was of crucial importance for shearing deformation of precast column; (2) flexural strength of the grouted sleeve cross-section was higher than that of the normal cross-section, which expressed that the compressive strength of a grouted sleeve in the cross-section should be considered; (3) a simplified analysis model based on modified plastic hinge length was presented to evaluate the deformation capacity of a precast column connected by a grouted sleeve, and the decreasing trend of displacement ductility compared favorably with experimental values, but the calculated ductility coefficient expressed smaller results when the axial compressive ratio was 0.5 and 0.85.

Seismic performance of precast column connected with grouted sleeve connectors

Semi-empirical model for shear strength of RC interior beam-column joints subjected to cyclic loads

The failure of beam–column joints in RC frame buildings induced by a strong earthquake can lead to the collapse of buildings. Therefore, numerous experimental studies have been carried out ...

Seismic Performance of Interior and Exterior Beam–Column Joints in Recycled Aggregate Concrete Frames

Interior Reinforced Concrete Beam-to-Column Joints Subjected to Cyclic Loading: Shear Strength Prediction using Gene Expression Programming

Seismic response analysis of assembled monolithic subway station in the transverse direction

Seismic behavior comparison of reinforced concrete interior beam-column joints based on different loading methods

Simulation study on the anti-penetration performance and energy absorption characteristics of honeycomb aluminum sandwich structure

To further enhance the hole-opening ability of the metal jet formed by the annular shaped charge on the armored steel target, a new annular shaped charge structure of a closed-cell W-shaped charge liner is designed based on a certain penetration depth. The impact of the length-diameter ratio of the charge, the inverted cone angle, and the cone angle of the liner on the opening diameter of the annular metal jet are studied through the orthogonal optimization of the annular shaped charge structures carried out by numerical simulation, which shows that the inverted cone angle and the cone angle of the liner are among the main factors that affect penetration depth and the opening diameter of the annular jet, respectively. According to this, an optimum annular charge structure considering both penetration depth and opening diameter is designed and tested by experiments. According to the results, the optimized annular jet records an opening diameter of 0.83 CD (Charge Diameter) when it penetrates the armored steel target with a thickness of 0.53 CD. The experimental results are consistent with the numerical simulation. The research results have certain practical engineering significance for guiding the design of the front-stage annular shaped charge structure of the multi-effect destructive warhead.

/pdf/the-influence-of-closed-cell-w-shaped-liner-parameters-on-3tj1z47y.pdf

The Influence of Closed-Cell W-Shaped Liner Parameters on the Penetration Performance of Integral Annular Shaped Charge

A portion of the casing charge's fragments would strike the target plate and ricochet when it exploded close to or inside a steel structure, like a ship or manufacturing facility. Considering the high pressure, high temperature, and high strain rate during the impact, the kinematic characteristics of the ricochet fragment, such as ricochet velocities and ricochet angle, are challenging to describe using the existing methods. In this study, a novel theoretical model of ricochet fragment kinematics under oblique impact was proposed, and the corresponding initial assumptions and application conditions were presented. A series of oblique impact experiments was conducted to obtain the differences in kinematic characteristics under various impact velocities and impact angles. The parameters of the proposed theoretical model were determined. The accuracy of the theoretical model was verified by using 921A hull steel target plate. The average relative error and standard deviation of ricochet velocity were 7.4 % and 2.3 %, respectively, and the mean relative error and standard deviation of the ricochet angle are 11.2 % and 1.1 %, respectively. The results showed that the theoretical model can predict the ricochet velocity well, and the error of ricochet angle increased due to the different pile-up effect of different strength target plates, but it was still within the reasonable range. In addition, the effects of the impact velocity and angle on the ricochet velocity and angle were analyzed. When the impact angle was small, the ricochet angle and velocity were affected by both impact velocity and angle. When the impact angle increased to a certain Angle (>64.2°), the ricochet velocity only increased linearly with the impact velocity. The ricochet angle increased with the increase in the impact angle. When the impact velocity was less than 400 m/s, the ricochet angle increased with the increase in the impact velocity. When the velocity is greater than 400 m/s, the ricochet angle decreased with the increase in the impact velocity. When the impact angle was greater than 57° and the impact velocity was greater than 400 m/s, the ricochet angle was almost only related to the impact angle. The results indicate that the proposed model has good accuracy and can have high application value in terminal effects, safety engineering, and structural defense fields. 

A theoretical model for the oblique impact of fragments

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Papers

Seismic behavior comparison of reinforced concrete interior beam-column joints based on different loading methods

Simulation study on the anti-penetration performance and energy absorption characteristics of honeycomb aluminum sandwich structure

The Influence of Closed-Cell W-Shaped Liner Parameters on the Penetration Performance of Integral Annular Shaped Charge

A theoretical model for the oblique impact of fragments