Yanzhi Liu

• Hunan University

This paper experimentally investigates the dynamic tensile performance of Q345 structural steel, especially taking the tested coupon thickness as the key parameter. The tests of low alloy Q345 structural steel widely used in China are carried out under intermediate strain rate level loading of 10¹s⁻¹ to 10²s⁻¹, as well as under static loadings for...

In this paper, three steel beam-column connections (welded flange-bolted web (WFB) connection, welded flange plate (WFP) connection and reduced beam section (RBS) connection) were experimentally examined under impact loadings. The impact tests using drop-hammer were carried out to simulate the dynamic behaviour of structural progressive collapse. T...

In this paper, two typed steel beam-column connections (Welded Unreinforced Flange-Bolted Web (WUFB) connection, Bolted Unstiffened End Plate (BUEP) connection) with and without reinforced concrete slab were experimentally examined under impact loadings. The impact tests using drop-hammer were carried out to simulate the dynamic behaviour of struct...

Concrete-filled steel tube (CFST) columns have been gradually used as an alternative to conventional reinforced concrete columns because of their excellent vertical and lateral bearing capacity, particularly when columns have a high risk of impact loading. Three-dimensional detailed finite element (FE) models are usually employed to estimate the im...

In this paper, three welded flange-bolted web (WFBW) beam-column connections with three types of weld access holes (fan-shaped, enlarged and FEMA weld access holes) were experimentally examined under impact loading. The design of such connections was based on the North American seismic code FEMA350 and the Chinese design codes. The impact tests on...

This paper presents an experimental assessment into the behaviour of fire-exposed reinforced concrete (RC) beam–column joints with different reinforcement anchorage details subjected to exterior column removal. The thermal response of the RC joint specimens is firstly described, including the development of the temperature fields and the horizontal...

This paper examines the behaviour of RC beam-column joints with different reinforcement detailing arrangements under pushdown loading before and after fires. The thermal responses of the RC joint specimens are firstly described, including the development of the temperature fields and the horizontal reactions as well as the deflections during the he...

This article deals with the dynamic behaviors of concrete after exposure to elevated temperatures using a split-Hopkinson pressure bar (SHPB) test set-up. Forty-nine concrete cylinders are experimentally investigated under different impact velocity after applied with different temperatures. A number of complementary static tests for concrete heated...

This study presents an experimental investigation on the fatigue performance of a blind bolt under axial-tension cyclic loads. Static, constant-amplitude, and variable-amplitude fatigue tests on standard bolts and blind bolts are carried out. The bolt failure modes, static tensile force–displacement relationships, and fatigue life are presented. Ba...

This paper deals with the shear behaviour of steel stud connectors in composite beams with profiled steel sheeting under static and impact loads. An experimental program including five static and ten impact push-out tests is firstly carried out, and the failure modes, the time history of impact load and slippage displacement, as well as the shear c...

This paper examines the dynamic behaviour of square tubular T-joints under impact loading by means of experimental, numerical and analytical studies. Firstly, a high-performance drop hammer setup is employed to carry out the impact tests on five hot-rolled square tubular T-joints with different chord thickness and width ratio of brace/chord under t...

This paper deals with the shear behavior of steel stud connectors between a concrete slab and steel beam under static and impact loading. An experimental program involving four static and nine impact pushout tests was designed and carried out according to the descriptions in related specification. The failure modes and the time history of impact lo...

This paper experimentally investigates the behaviour of RC beam-column connections under column removal induced by fire. Firstly, a self-developed hybrid heating furnace is employed to carry out the fire tests on five RC connections with varying development lengths following two different heating schemes, with or without cooling phase. The thermal...

This paper examines the mechanical behaviour of concrete following exposure to elevated temperature up to 800°C through experimental investigation, with emphasis on the effect of microstructure evolution on the deterioration of concrete compressive strength. First, a specially built electrical furnace is employed for the application of high tempera...

This paper deals with the behavior of hot-rolled square tubular T-joints subjected to impact loadings by means of experimental investigation. A drop hammer setup is used for testing four tubular T-joints, including three stiffened details (with transversely-stiffened chord, doubler plate-stiffened top flange of chord, ribbed tubular brace) and one...

The dynamic behavior of reinforced concrete (RC) structures under impact loadings has received great attention from civil engineers and researchers. However, few studies have been conducted to evaluate the flexural behavior of the impact-damaged RC beams. In order to further understand the effect of impact loading on the residual flexural behavior...

Due to the frequent fire accidents in recent years, structure resistance to progressive collapse under fire has been extensively concerned. Not only the degradation of material property and bond performance is induced by fire, but the structure also suffers significant temperature internal forces and internal forces redistribution. Therefore, four...

This paper examines the dynamic behaviour of collar plate reinforced tubular T-joints with precompression chord by means of experimental and numerical studies. An experimental programme involved one test on unstiffened tubular T-joint and three on stiffened configurations is carried out through a high-performance drop hammer machine. A series of di...

In this paper, the dynamic behaviour and catenary action of axially restrained steel beam under impact loadings is examined through a combination of experimental and numerical investigations. It describes and discusses the results of six impact tests on the axially restrained welded H-beams by means of the drop hammer test machine. The main behavio...

This paper experimentally examines the dynamic behaviour of two steel plane tubular frames subjected to impact loading with the same impact energy. One specimen is set up to be hammer impacted on the mid-span section of the top chord between two K-joints, while another is loaded on the mid-span section of the top chord within the middle K-joint. Th...

The mechanical behavior of concrete at elevated temperature up to 800°C (1472°F) was examined by means of experimental investigation, with emphasis on the effect of microstructure variation on damage evolution of concrete. First, a specially built electrical furnace was employed for the application of high temperature on the concrete specimens. For...

In current design specifications, a static procedure using code-prescribed loads has been commonly used to design bridges against ship collisions. However, the collision-induced response may be greatly underestimated as a result of the absence of the dynamic amplification effect in the static procedure. Hence, the safety of bridge structures expose...

This paper experimentally examines the behaviour of tubular K-joints subjected to impact loadings. An experimental programme involved two tests on unstiffened tubular K-joints under different impact energies and one on stiffened configuration is carried out through a high-performance drop hammer machine. The dynamic responses of three tubular K-joi...

The inherent architectural and structural advantages of hollow structural section (HSS) columns relative to their open section counterparts as well as the practical and economical merits offered by bolted angle connections have prompted significant interest into the behaviour of blind-bolted connections. To this end, a range of special connection d...

This paper examines the behaviour of open beam-to-tubular column bolted connections with angles subjected to direct tension and compression. Experimental and numerical studies as well as simplified mechanical assessments are presented. The response of seven tension tests and six compression tests on blind-bolted angle connections and combined chann...

This paper deals with the behaviour of semi-rigid angle connections between open beams and tubular columns under shear loads. It provides an account of six connection tests on blind-bolted as well as combined channel/angle configurations carried out under predominant shear loading conditions. The experimental set-up and specimen details are first i...

This paper examines the behaviour of two types of practical open beam-to-tubular column connection details subjected to combined moment, axial and/or shear loads. Detailed continuum finite element models are developed and validated against available experimental results, and extended to deal with flexural, axial and shear load interactions. A numer...

In some design situations, such as those involving extreme loading conditions, steel connections can play a vital role in arresting structural disproportionate collapse, and therefore should be designed to resist significant moments, axial loads, shear forces, or a combination of these actions. While the moment-rotation behaviour of semi-rigid and...

Whilst the moment-rotation behaviour of typical connection configurations has been extensively examined in previous studies, there is a relative lack of information on the performance under more generalised loading conditions, particularly in relation to semi-rigid connections to tubular columns under shear loads. To this end, this paper deals with...