Advanced Materials Research Vols. 368-373

Abstract: To realize the industrialized lateral resistant system in steel structure, a low cyclic loading tests is carried out for steel frames with infill prefabricated reinforce-concrete shear walls (solid wall). The crack developed in infill walls and deformation performances of specimen are investigated. And the force transfer mechanism, failure mode, hysteretic behavior, stiffness degradation deformation and ductility and energy dissipation of composite structure are analyzed too. Test results show that the concrete crushing in infill wall is the main failure paten and the failure mode is ductile failure. Within the whole loading period, low cyclic fatigue of shear connectors (U sharp bars) doesn’t occur. The performance of the specimens including post peak strength degradation, ductility behaviors and energy dissipation, are significantly improved. In the whole test the steel and concrete components work integrally. And the specimen has good seismic performances and can be widely used in seismic areas.

Abstract: CS Panel Residential Structure is a new type of structural system investigated and manufactured for the requirements of wall reformation and residential industrialization.Now set up two finite element models on the basis of the two types of three storeys CS panel structure experimental models (including tectonic columns or not ) with the ratio 1:2.8 that designed before. Then analyze the random seismic response of the two types of CS panel structure under the action of ground motion acceleration power spectrum using the spectrum analysis module of the finite element analysis software ANSYS.Based on the first excursion failure theory and stochastic vibration theory, dynamic reliability of the CS panel structure subject to different seismic intensity is calculated and compared, the effect of the edge component is summarized using structure seismic response of random statistic.

Abstract: A 1/4 scales four-storey model of post-tensioned unbonded prestressed concrete hollow slab-column structure has been made to do the ultimate load test on the second-storey floor. By measuring the floor deflection, stresses of steel bars and cracks of floors, the bearing capacity of floor is explored. The bearing capacity tests of floor are divided into three stages: elastic stage, crack growth stage and destruction stage. Based on the test results and crack developments in floor, a improved plastic hinge model is carried out to predict the ultimate loads. The calculated results of the ultimate loads with improved plastic hinge model are in good agreement with the experiment data.

Abstract: Land subsidence is particularly critical in Tanggu, due to its flat-lying topography and large thickness of the soft clay. The subsidence up to 140mm/year reached its most critical state in the mid-1970s. To mitigate this hazard, some strict measures resulted in a drop in groundwater use, especially banning the exploitation of groundwater, were exerted. Accordingly, the subsidence indeed had a decreased trendy in this time interval. Meanwhile, a GPS-based monitor data also revealed that light uplift phenomena emerged in some individual monitor series. For discussing the relationship between this abnormality and the termination of groundwater, and analyzing the deformation characteristic after exerted this measure, this article with the aid of numerical method predicts the land subsidence. The result reveal that the settlement is ceased and obvious uplift phenomenon only emerges in the central region of the stop mining well, due to various supply resource the water level could have a rapid recovery after banning. Meanwhile, own to the time-dependant behavior of the soft layer and clay aquitard, the most region far form the ban well also emerges subside, but the subsidence rate switches to decreased trendy with time. Generally, the subsidence or uplift is stabilized in a finite time interval after the termination of groundwater pumping. Meanwhile, due to the different hydrogeologic and stratum conditions, the stabilized subsidence and uplift value are also different from unit 2 to unit 5.

Abstract: Steel structure project of an airport building is full of characters as complex forming, super long structure, complex structure selection, and bearings or joint. In this paper, the author describes the construction technique of roof steel structure in the project of a terminal building from the perspectives of construction division, construction sequences, and erection and technical measurements. It can assure the safety and quality of construction.

Abstract: A new RC frame multi-ribbed composite walls structure is provided by using low yield strength steel. Two calculating structures are analyzed which one is the RC frame shear wall structure used as a comparison, and the other is the RC frame multi-ribbed composite walls structure. The nonlinear earthquake responses of the structures are calculated by using program IDARC2D.The nonlinear dynamic analysis models of the structures are established with retrogressive three-linear resilience model for beam, column and RC shear wall elements, while a smooth hysteretic model is proposed for representing low yield strength steel panels. The nonlinear dynamic time-history analysis of the structures under horizontal earthquake waves has been carried out. The earthquake responses of the structures and energy dissipation are studied, which provide more data information for the comprehension of earthquake responses and seismic performance of the RC frame multi-ribbed composite walls structure. The calculating results show that the low yield strength steel panels have obvious seismic mitigation effects, and that RC frame multi-ribbed composite walls structure has good seismic capacity.

Abstract: Spew fillet is common in co-cured composite single lap joint. It plays an important role in the safety of the joint. In this paper, three spew fillets with typical geometries under static tensile load were investigated numerically using the commercial finite element code ANSYS. The computation results indicated: the fillet with a long curve edge had better performance than other fillets.

Abstract: In order to understand the mechanical performance and related tectonic design requirements of the concrete-filled steel tubular joints with special-shaped cross-section , three T-shaped concrete filled steel tubular column joints with exterior diaphragms were manufactured and experimented under cyclic loading. By changing the axial compression ratio of the columns and increasing the width and overhanging length of the stiffening ring, the hysteretic performance and working mechanism of such joints under cyclic loading were studied. The results show that by increasing the width and overhanging length of the stiffening ring, the hysteretic performance, ductility and energy dissipation capacity of joints were obviously improved.

Abstract: Quasi-static tests of three specimens of steel-concrete composite fabricated shear wall were performed to investigate its seismic behavior. The test results indicate that horizontal cracks run through the interface between the wall and the base beam, diagonal cracks appear on the whole prefabricated concrete shear wall. The specimens fail in the mode of bending-shear, the hysteretic curves according to the test were full, it means that they have better seismic bearing capacity.

Abstract: Asphalt layer modulus is one of the important mechanical parameters in pavement design. It will directly influence the design result and the mechanical properties of asphalt pavement structure. Using pavement design and analysis software, the effects of asphalt layer modulus on surface deflection, tensile stress at the bottom of base and sub-base course, stress at the the bottom of asphalt layer and service life of heavy load semi-rigid asphalt pavement structure were analyzed systematically. And the influencing laws were analyzed, too. The results indicate that the mechanical properties, deforming characteristics and service life of heavy load asphalt pavement were influnced significantly by asphalt layer modulus. With the increasing of asphalt layer modulus, the surface deflection, tensile stress at the bottom of base and sub-base course would significantly decrease, and service life of heavy load semi-rigid asphalt pavement structure would be improved.