Analysis showed that concrete cracking would change distribution law of shear lag effect, and its effect is small on the effective width coefficient of flange at mid-span, its effect is big on that at mid-supported section.

Under the initial tensioning stage,end tensioning stage and secondary dead load,the stresses of the whole beam are analyzed. The stress fluctualions and distributions of the mid-span section are presented against varations in prestressed tensioning.

but if the stiffness of the beam is calculated as under the short-term combined action of loads instead of using the method of article 5.3.5 GBJ10-89, the measured and the calculated values of the total deflection at midspan of the beam are close to each other.

The results show that the differences between the measured values and the calculated values of the total deflection at midspan of the beam are quite big when the stiffness of the beam is calculated according to the method specified in article 5.3.5, GBJ10-89 for obtaining the value of camber due to the action of prestressed bars;

Taking simply-supported T-beam having both supports with 15.6 and 15.6m spans as example,theoretical analysis and calculation demonstrate that while heightening mid span's bearing strength,this method lowers the shear resistance of beam at intermediate support.

A Rational and Simple Method for Calculating Peeling-off Stress in Concrete Cover of Midspan of FRP Strengthening RC Beams

合理简单计算FRP加固混凝土梁跨中保护层剥离应力的新方法

The results of the testing indicate that the lateral vibration amplitude at midspan of the beam exceeds the limit value,the beam can- not meet the requirements for the freight trains running at a speed of 120 km/h,and the vertical and lateral rigidity of the beam should be raised.

comparing dynamical response of middle bridge stride on vehicle passing bridge and on equivalent moving loads,the displacement is same but the velocity and the acceleration are different;

Based on the interface slip of the simply supported steel and concrete composite beams, the deformation differential equation of steel and concrete composite beams is established,and the calculating formulae of the deformation are proposed for different loading cases by theoretical analysis.

The Yangming Bridge in Ji'an is 1 744.9 m in total length,of which the main bridge is designed as a 5-span half-through concrete-filled steel tube tied arch bridge with span arrangement(36+138+188+138+36) m.

the maximum displacement of bridge was not at the middle, and the displacement responds of middle span is less than side span;

全桥的最大位移并不发生在中跨跨中,且中跨跨中的位移响应没有边跨大;

The attenuation of elastic modulus of Steel Fiber Reinforced Prestressed Concrete Slabs(SFRPCS) with different steel fiber contents(0%、1%、2%) and under different stress levels(0.80、0.85) is investigated through flexural fatigue experiments.

These source terms are determined using the velocity triangles and a row-by-row representation of the blading at mid-span.

Time-dependent data were obtained from thirty miniature pressure transducers and three hot film gauges situated at the mid-span of the wing.

The rotor and stator blade elements loss at mid-span approximately equals two-dimensional cascade loss, when the data of probes exposed to strong flow unsteadiness have been corrected.

An electromagnetic shaker is used to apply a steady-state harmonic excitation to the ulna near its mid-span and measurements of the complex driving-point impedance are made.

Starting with a localized reduction ofEI at the mid-span of a simply supported beam, damage modelling is done for a typical steel beam element.

A 3-D computation shows that a secondary vortex generated in suction surface mid span interacts to reduce the tip leakage vortex that initiates the stall.

On the other hand total pressure loss in the wake in mid span region is less with backward sweep, which favours its application here.

It appeared that the blade inlet angle of the original impeller design was too excessive at mid span, causing best cavitation performance to occur at 160 percent of the rated flow.

According to the design requirements, the bridge must be capable of safely carrying a 6-kilogram mass placed on the structure at mid span.

After applying the load, a reading of mid span deflections was taken every 24 hours for the first 10 days.

On the basis of the finite element method, a nonlinear analysis of reinforced concrete flexural members is presented in this paper.The nonlinearity of behavior of concrete, continuosly changing character due to crack propagation under monotonically increasing loads, effect of bond between steel and concrete were taken into account. During the analysis, concrete and tension steel were divided into triangular elements; compression steels and stirrups were divided into bar elements while the bond between concrete...

On the basis of the finite element method, a nonlinear analysis of reinforced concrete flexural members is presented in this paper.The nonlinearity of behavior of concrete, continuosly changing character due to crack propagation under monotonically increasing loads, effect of bond between steel and concrete were taken into account. During the analysis, concrete and tension steel were divided into triangular elements; compression steels and stirrups were divided into bar elements while the bond between concrete and tension steels were analysed with the help of spring linkage elements.We have developed a computer program that can be used to calculate the complete behavior, from zero load until failure, of a reinforced conrete flexural member under monotonically increasing loads.Some reinforced concrete simply-supported beams with rectangular section, subjected to 2-point symmetrical transverse loading were calcutatad by means of this program.Computed deflections, crack patterns, ultimate loads and the failure mechanism show reasonable agreements with test results.

In this paper according to earthquake-damage analysis a pattern of the dynamic calculation, which must couple with the superstructure and the substructure in regard to the beam bridge as a whole,has been proposed. The rule of earthquake-damage is explained rationally.

Based on the shear tests of 18 concentrated loaded reinforced concrete restrained beams without web reinforcement, the general rule of the shear strength of such beams was investigated. It was found that the shear strength varies with shear span ratio and moment ratio, that is in the same span the moments occurred in opposite directions would influence the shear resistance of the beam. The formula for computing the shear strength of reinforced concrete restrained beams without web reinforcement was derived in...

Based on the shear tests of 18 concentrated loaded reinforced concrete restrained beams without web reinforcement, the general rule of the shear strength of such beams was investigated. It was found that the shear strength varies with shear span ratio and moment ratio, that is in the same span the moments occurred in opposite directions would influence the shear resistance of the beam. The formula for computing the shear strength of reinforced concrete restrained beams without web reinforcement was derived in this paper.