Advanced Materials Research Vols. 287-290

Abstract: To understand the effect of filler walls on lateral rigidity of steel frame, Some methods such as theoretical analysis, finite elements calculation and experiment study were carried out to do research on the resistant-lateral effectiveness and the steel consumption of the three different structural systems, namely steel frame, frame-bracing and frame-board. The results show that the frame-board system can improve the structural lateral rigidity effectively, and will enhance the structural fundamental natural frequency sharply as well as reducing the structural steel consumption. It is an effective method for improving structural lateral rigidity to utilize the frame filled with wall panel. Making fully use of lateral rigidity of the wall panel can reduce the size of beam and column cross-section, material consumption and project cost.

Abstract: The seismic performance test of the model CFST tube structure with transfer story has been finished. The model with 13 floors and with a scale of 1:10 consists of an outer-tube and an inner-tube. The former is a framed tube supported on CFST frames and the latter is an RC tube. A series of seismic performance tests of the model, which is equivalent as two degrees of freedom system, on acceleration earthquake waves in four cases (0.22g, 0.4g, 0.62g and 1.0g) have been fulfilled. The experiment has illustrated that the CFST tube structure is an outstanding structural style with excellent anti-seismic behavior.

Abstract: The analytic solution of incident P wave, SV wave and SH wave amplitudes reflected at free surface in elastic medium was presented in this paper. Taking the assumption that the wave propagation media are in elastic half space and the seismic wave is plane simple harmonic wave, the incident wave and reflected wave functions of P wave, SV wave and SH wave were deduced with elastic wave theory, and the wave amplitudes reflected at free surface in elastic media was presented

Abstract: In the paper, the seismic damage information of six kinds of buildings, including Brick and concrete structure, the bottom frame brick and concrete structure, frame construction, Big span structure, special structure, farmhouse, were collected. Based on the architecture type, damage degree, height of house, the seismic damage information were statistic analysis in the damage characteristic of the structure. And on the basis of the damage characteristic, the dynamic response and earthquake resistance mechanism were studied. The correlation among site feature, structure type, strength of materials, construction technology and the seismic damage of structure were discussed.

Abstract: The bearing capacities of one-way reinforced concrete beams with elastic supports are investigated in this paper. According to the nonlinear characteristics of the beams, the basic equations based on plastic theory of concrete are derived by considering the in-plane force effects that aroused by the constraints of supports when the beams deforming. It is indicated that the calculation results are in good agreement with experimental datum, and the influences of different supports on the bearing capacities of the beams are quantitatively given for the first time.

Abstract: The width-thickness ratio of the rotation capacity of the HSB800 steel flexural members are evaluated in this study. First of all, the properties of high-performance steel are analyzed from the tension coupon test - SS400, SM490, HSB800. By the result, high-performance steel have the three properties - the high yield ratio, the low modulus of elasticity strain-hardening, and the low strain at tension stress. The rotation capacity of the HSB800 steel flexural members are evaluated using F.E. program. By the F.E result, the HSB800 steel flexural members are not satisfied in the current code that rotation capacity, R>3 in compact section. Based in the experiment and theories, this study suggested limiting the width-thickness ratio of HSB800 steel satisfied in the current code. So, the limitation of width-thickness ratio of the HSB800 steel are conservative than the width-thickness ratio in the code.

Abstract: Many unreinforced adobe or mud-brick structures have in the past suffered severe damage from seismic forces and have caused a vast number of deaths. In contrast, some adobe buildings located in seismic regions have performed well under several seismic events. Researchers noticed that most existing circular adobe houses performed well in withstanding earthquakes even though some did not have any additional ductile reinforcement. This paper presents the investigation of seismic performance of unreinforced circular adobe buildings using static pushover testing. A scaled model (1:3 scale) of adobe circular structure were built and tested by static lateral load and pushed to total collapse. The results presented in the form of capacity curves, are compared with the expected lateral loading obtained from the static tilt testing carried out in earlier research. The outcome of this research can be used to evaluate the existing circular adobe houses and can give design recommendations of suitable configurations for new circular adobe buildings.

Abstract: In this paper, the authors predict responses of an earth structure due to a dynamic vibration using a 3-dimensional soil-water coupled dynamic analysis. The earth structure sitting on three types of ground which are consisted of liquefiable and un-liquefiable layers is found to settle the most in the ground of which the loose sandy layer is at the top. It shows the most dam settlement occurs in the ground type of which the loose sandy layer is at the bottom. A relative better seismic stability of the earth structure is found to sit on the ground of which the loose sandy layers underlie in the middle.

Abstract: In order to investigate the joint work pattern of upper steel part and lower supporting concrete part，the example of Ningxia flower art center was adopted to create finite element models for upper steel structure only and steel-concrete structure. And a further analysis for the models was done in terms of statistic analysis、elastic analysis under frequently occurred earthquake and dynamic elastic-plastic time-history analysis under seldom occurred earthquake. Besides, the influence of concrete structure’s elastic-plastic property to the whole structure under seldom occurred earthquake was discussed. The results show that structure response such as displacement and internal force increase considerably under joint work pattern. Moreover，the magnification effect of the lower structure about seismic load can not be ignored when designing and analyzing. And the structure’s seismic response will decline if we take into account the lower concrete's elastoplasticity under seldom occurred earthquake.

Abstract: Polyvinyl alcohol (PVA)/polyvinyl pyrrolidone (PVP) hydrogel wound dressing has been fabricated using freezing-thawing method. The content of water, the rate of water absorption and pH value of hydrogel were tested, The mechanical properties and water transmissivities of hydrogels were analyzed when the PVP contents were difference. Experiments results show that the hydrogels diaphaneity is better, water contents are over 70percent; water transmissivity of hydrogels are over 100 percent, the highest value reaches to 204 percent; the pH value closes to the level of human body, the highest pH value reaches to 6.83; the tensile strength of hydrogel is 0.75 MPa when PVP content is 8 percent, reaches to the largest value; all of PVA/PVP hydrogels water transmissivities reach to 700 g·m^-2·24h^-1.