In erection of falsework, for a rectangular panel inside a falsework should it be braced along the two diagonals?
When a rectangular panel is subject to an eccentric load or a lateral load, it tends to deform into a […]
Questions and Answers
In prestressing work, if more than one wire or strand is included in the same duct, why should all wires/strands be stressed at the same time?
If wires/strands are stressed individually inside the same duct, then those stressed strand/wires will bear against those unstressed ones and
In bridge widening projects, the method of stitching is normally employed for connecting existing deck to the new deck. What are the problems associated with this method in terms of shrinkage of concrete?
In the method of stitching, it is a normal practice to construct the widening part of the bridge at first
In incremental launching method of bridge construction, what are the measures adopted to enhance sufficient resistance of the superstructure during the launching process?
(i) During the launching process the leading edge of the superstructure is subject to a large hogging moment. In this
In the design of a simply supported skew bridge, which direction of reinforcement should be provided?
In the conventional design of steel reinforcement for a simply supported skew bridge, a set of reinforcement is usually placed
In designing concrete structures, normally maximum aggregate sizes are adopted with ranges from 10mm to 20mm. Does an increase of maximum aggregate size benefit the structures?
Basically, the force supplied by a concrete compression machine is a definite value. For normal concrete strength application, say below
In the design of elastomeric bearings, why are steel plates inserted inside the bearings?
For elastomeric bearing to function as a soft spring, the bearing should be allowed for bulging laterally and the compression
In the construction of a two-span bridge (span length = L) by using span-by-span construction, why is a length of about 1.25L bridge segment is constructed in the first phase of construction?
Basically, there are mainly three reasons for this arrangement: (i) The permanent structure is a statically indeterminate structure. During construction
In a curved prestressed bridge, how should the guided bearings in piers of the curved region be oriented with respect to the fixed bearing in abutment?
To determine the orientation of guided bearings, one should understand the movement of curved region of a prestressed bridge. Movement