For the first time in continuous rigid frame bridges,new Chongqing Shibanpo bridge has adopted 330m span,and the use of steel-concrete connector is also a first in similar bridge designs in the world.

Aerodynamic admittance functions describe the transfer behavior between wind spectra and the spectra of the buffeting forces,which directly determine the precision of the predicted buffeting responses for bridge designs.

Referring to the basic methods for bridge structure designs in the specifications of several countries and combining with the actual conditions,this article analyzes the characteristics of bridges in the urban railway transportation system,puts forward the classification and combination form of the loads on the bridges,presents main formulae and calculating coefficients for bridge designs and uses a computational example to compare the limit state method with the allowable stress method.

The engineering practice illustrates that the rubber plank supports used in the road and bridge designs can also be used for the joining structural member supports of the civil architectural

Objective To investigate the clinical advantages in application of adhesive bridge of metal alar plate in molars with different bridge designs and different pretreatments of metal adhesive surfaces.

It is impossible and costly to carry out detailed buffet analysis in the bridge conceptual phase and many short span bridge designs because the wind load on bridge is complicated.

The Yangtze Valley Hydro-electric Scheme is an abnormally tremendous engineering project in the world. The trestle bridges required for concreting the dam only are of abnormal size for instauce. The main trestle bridge has to carry five lines of standard gauge railway track and two tracks for loading about 30 huge concreting cranes of about 700 tons in dead weight each. The bridge required for the first stage of work is about 90m.in height,and later on the whole flooring system of the bridge...

The Yangtze Valley Hydro-electric Scheme is an abnormally tremendous engineering project in the world. The trestle bridges required for concreting the dam only are of abnormal size for instauce. The main trestle bridge has to carry five lines of standard gauge railway track and two tracks for loading about 30 huge concreting cranes of about 700 tons in dead weight each. The bridge required for the first stage of work is about 90m.in height,and later on the whole flooring system of the bridge has to be lifted twice, each time being lifted 35m. in height. In addition, the bridge must be constructed and lifted with in the given comparatively short period of time. In this paper, some proposals for the preliminary design of the trestle bridge are presented. In the design, the super-structure contains a series of welded steel plate girders. The main girders are 24 meters span all-welded steel Plate girders of the standard railway bridge design. Two alternative designs of the trestles are proposed for comparison,one being composed of reinforced concrete tube posts of 2.0 meter diameter,similar to those used in the sub-structure of the famous Yangtze Bridge in Wuhan, the other being of steel structure. Necessary figures of the results of the design are given including the quantity of materials, the time and procedure of erection,etc. On account of economyof steel the design of R.C. trestles is suggested to be adapted in comparison with the steel structure.

Bridges crossing mountainous streams are frequently built with circular piers and skew to the watercourse, The length of the bridge is usually not reduced by the approaching embankmemts and the degradation of the scour bed is comparatively small. Based upon the results of our hydraulic model studies and some of the field data, the characteristics of the backwater before the bridge and the creep height of the coming water upon the pier can be shown as follows:(1) The height of backwater decreases...

Bridges crossing mountainous streams are frequently built with circular piers and skew to the watercourse, The length of the bridge is usually not reduced by the approaching embankmemts and the degradation of the scour bed is comparatively small. Based upon the results of our hydraulic model studies and some of the field data, the characteristics of the backwater before the bridge and the creep height of the coming water upon the pier can be shown as follows:(1) The height of backwater decreases as the angle of skew increases. The design method used in current practices, not taking this point into account, will give erroneous results, especially when the angle of skew is large.(2) The value of creep height is far more than that of the backwater. It is an important characteristic parameter in bridge design, the value of which varies as the second power of the angle of skew, and its maximum value happens to be in the range of approximately 45°～55°(3) The discharge through one span (all spans are equal in length), increases as its location moves from the upstream side to the downstream side. The discharge through the span nearest to the downstream side is about 15～20% larger than the average value.(4) The skew bridge, the angle of skew of which is more than 50°, is not the most disadvantageous from the point of view of hydraulics.

In bridge designs of the present, the classic elastic theory is used for calculation of indeterminate reinforced concrete arches, Nevertheless, it could neither reflect the pratical conditions of the structure,nor fully tap the potential of the stucture. Starting from the theory of structural plastic analysis, experimental study was carried out on the ultimate strength of the reinforced concrete two-hinged arches which took into account the redistribution of the innerforces. Herewith a method for the calculation...

In bridge designs of the present, the classic elastic theory is used for calculation of indeterminate reinforced concrete arches, Nevertheless, it could neither reflect the pratical conditions of the structure,nor fully tap the potential of the stucture. Starting from the theory of structural plastic analysis, experimental study was carried out on the ultimate strength of the reinforced concrete two-hinged arches which took into account the redistribution of the innerforces. Herewith a method for the calculation of the ultimate strenth of the reinforced concrete arches within the plane was suggested and also well confirmed by the experimental results.