Xin Tang Wang

Experimental Research of Performance of a New Fabricated Lightweight Steel-Concrete Composite Floor

For study of mechanical property of a fabricated composite floor consisting of thin-walled steel I beams and lightweight aggregate concrete panels, the static load experiment of the new composite floor was presented and the results was discussed. The specimen was simply supported at the two shorter sides and the other two longer sides free. The equivalent uniform loads are applied to the floor through setting the load blocks on the supper surface of the floor. The vertical displacements, slips between steel beam and concrete panel and strains of the specimen were measured. It was shown that the strain at the bottom of the concrete panel is quite close to the strain at the top flange of the main beam and the strain at bottom flange of the main beam is much larger than the value at top flange.

Research of Mechanical Performance of Thin-Walled Steel Lightweight Concrete Composite Floor

For study of mechanical performance and bearing mechanism of the fabricated composite floor consisting of thin-walled steel beams and lightweight aggregate concrete panels, the static load experiment of a composite floor was finished and presented. The specimen is simply supported at the two shorter sides and the other two longer sides free. The equivalent uniform loads are applied to the floor through setting the load blocks on the supper surface of the floor. The vertical displacements and strains of the specimen were measured and analyzed. The experimental results show that the new composite floor has greater bearing capacity and better elasticity. It is concluded that although there is combined action between the main beam and the concrete panel, there is also evident slip between top flange of the main beam and the concrete panel.

Study of Mechanical Property of Cold-Formed Thin-Walled Steel Lightweight Concrete Composite Floor

For analysis of mechanical property and bearing mechanism of the composite floor consisting of cold-formed thin-walled steel beams and lightweight aggregate concrete panels, the static load test of a composite floor was presented. The floor specimen is simply supported at the two shorter sides of it and the other two sides free. The equivalent uniform loads are applied to the floor through piling up the load blocks on the supper surface of the floor. The displacements of the floor and strains of specimens were measured and analyzed. It is denoted that the vertical displacements of the floor varied linearly with the load while it is less than 8kN, but the slips of main beam and concrete panel vary nonlinearly during the whole loading process. It was seen that there were not evident cracks in the concrete panels while the applied loads are much larger than the normal loads.

Study of Post-Fire Performance of Steel Fiber Reinforced Ceramsite Concrete Filled Steel Tubes

The post-fire behavior of a set of steel fiber reinforced lightweight aggregate concrete filled steel tubular short columns (noted as SFLC-SSC) after exposure to fire was experimentally studied. Effect of the maximum value of fire response temperatures of the tubes and their geometric parameters on the strength and the other mechanical property of the specimens were especially discussed. The experimental results show that the specimens of SFLC-SSC have higher post-fire bearing capacity and better plastic deformation. It was concluded that the maximum response temperature of the specimens has great effect on the post-fire bearing capacity of steel fiber reinforced concrete-filled steel tubes subjected to fire load, and incorporation of 0.5% of volume of steel fiber is best for enhancing the axial compressive bearing capacity of the specimens of SFLC-SSC after exposure to fire.

Experimental Study of Performance of Self-Stress Lightweight Aggregate Concrete Filled Steel Tubes after Exposure to Fire

The post-fire behavior of a set of self-stress lightweight aggregate concrete filled steel tubular short columns (noted as SSLC-SSC) after exposure to fire was experimentally studied. Effect of the maximum value of fire response temperatures of the tubes and their geometric parameters on the strength and the other mechanical property of the specimens were especially discussed. The experimental results show that the specimens of SSLC-SSC have higher post-fire bearing capacity and better plastic deformation, there was no obvious descent segment in post-fire load-displacement curves of the most specimens subjected to fire load. It was concluded that the maximum response temperature of specimens has great effect on the post-fire bearing capacity of self-stress concrete-filled steel tubes subjected to fire load, and the value of self-stress corresponding to 10% of dosage of expansive agent has the greatest effect on post-fire bearing capacity of specimens of SSLC-SSC.

Research of Post-Fire Mechanical Property of Steel Fiber Reinforced Ceramsite Concrete Filled Steel Tubes after Exposure to Fire

The post-fire axial compressive behavior of a set of steel fiber reinforced ceramsite concrete filled steel tubular short columns (noted as SFCC-SSC) was experimentally studied. Effect of the maximum value of fire response temperatures of the specimens and some parameters on the axial compression performance of the specimens was especially discussed. The results show that the surface of the steel tubes after fire presented dark red for 700°Cof furnace temperature and orange red for 900°C, and there was no obvious descending segment in post-fire load-displacement curves of the most specimens subjected to fire load. It was concluded that the axial bearing capacity of the specimens aftersuffering the furnace temperature of 900°C is much less than that of the specimens not subjected to fire load, and the volume of steel fiber of 0.5% of has the greatest effect on post-fire bearing capacity of specimens of SFCC-SSC.

Study of Post-Fire Axial Compressive Behavior of Self-Stress Ceramsite Concrete Filled Steel Tubular Short Columns

The post-fire axial compressive behavior of a set of self-stress lightweight aggregate concrete filled steel tubes (noted as SSLC-ST) after exposure to fire was studied. Effect of the fire temperatures of the specimens and some parameters on the axial compressive behavior of the specimens was especially discussed. The results show that the initial circumferential strain of surface of the steel tubes is much larger than the longitudinal strain of the steel tubes, and the specimens of SSLC-ST have higher post-fire axial compression bearing capacity and better plastic deformation. It was concluded that the local buckling and overall failure of the specimens take place in succession while the specimens are axially loaded, and there are a lot of slip lines with angle of 45o on surface of the steel tubes.

Numerical Analysis of Fire Performance of a Spacial Pre-Stressed Steel Structure in Fire

The numerical model of analysis of fire performance of a spatial pre-stressed steel structure with large span was established based on the software Marc. The thermal response and structural response of the pre-stressed steel structure was computed for some nodes of the structure in fire. The different fire scenes were considered for analysis of response temperature, displacements and stresses of the nodes of the pre-stressed steel structure.It is concluded that the temperature rise of the nodes of the structure is far behind that of air near the nodes, however they are quite close as the fire lasted for 3600s and almost the same after 7200s.The results show that the displacement of the node right above the inner cable is the maximum and the node above the outer cable has the smallest value of displacement and the maximum value is about two and half times as large as the minimum.The results show that the reason why the cables are out of work is that the equilibrium between the cables and the rods of the structure is lost, but not that the stress relaxation caused by thermal expansion make the cables out of work.

Experimental Study of Post-Fire Behavior of Steel Fiber Reinforced Ceramsite Concrete Filled Steel Tubes

The axial compressive mechanical behavior of steel fiber reinforced ceramsite concrete filled steel tubes (noted as SFR-CCST) after exposure to fire are experimentally studied. Effect of furnace temperature, dosage of steel fiber in specimens on the post-fire mechanical performance of the specimens after exposure to fire was especially discussed. The results show that all the specimens of SFR-CCST have higher post-fire bearing capacity and better plastic deformation, and there was no obvious descending segment in the load-strain curves of the most specimens after exposure to fire. It was concluded that the furnace temperature applied to the specimens and dosage of steel fiber in the specimens of SFR-CCST has some effect on the post-fire mechanical performance of the ceramsite concrete-filled steel tubes after exposure to fire, and the dosage of steel fiber of 0.5% has the most effect on the post-fire performance of lightweight aggregate concrete filled steel tubes after exposure to fire.

Study of Post-Fire Bearing Capacity of Self-Stress Ceramsite Concrete Filled Steel Tubes

Mechanical behavior and bearing capacity of self stress ceramsite concrete filled steel tubes (noted as SCCST) after exposure to fire are experimentally studied. Effect of the parameters, such as value of furnace temperatures, self stress on the post-fire bearing capacity and ductility of the specimens after exposure to fire were especially discussed. The experimental results show that all the specimens of SCCST have higher post-fire bearing capacity and better ductility, and there was no obvious descending segment in the load-strain curves of the most specimens after exposure to fire. It was concluded that the furnace temperature subjected to the specimens and the initial self stress produced in the specimens of the composite short columns has some effect on the axial bearing capacity of ceramsite concrete-filled steel tubular short columns after exposure to fire, and the volume of expansion agent of 10% has most great effect on post-fire bearing capacity of SCCST after exposure to fire.