CN1884774A

CN1884774A - Method of employing assembled steel arch truss to reinforce metal arch corrugated plate roofing

Info

Publication number: CN1884774A
Application number: CNA200610200572XA
Authority: CN
Inventors: 司炳君
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2006-06-16
Filing date: 2006-06-16
Publication date: 2006-12-27
Anticipated expiration: 2026-06-16
Also published as: CN100398770C

Abstract

The invention relates to a method for using assembly steel truss to strengthen the metallic arc ripple roof cover, wherein it is characterized in that: it uses assembly steel truss to be arranged at the inner side of arc ripple plate while their distance is 6-9m; and adds 2-3 longitudinal trusses between each arc truss, to make steel truss and ripple plate share external load, to strengthen the roof cover. And the invention can avoid increasing steel consumption most, to improve the safety and the application of roof cover.

Description

A kind of method that adopts the assembled steel arch truss reinforce metal arch corrugated plate roofing

Technical field

A kind of method of assembled steel arch truss reinforce metal arch corrugated plate roofing that adopts belongs to civil engineering large-span steel technical field.

Background technology

At present space structures worldwide obtains fast development, and in numerous space structures, it is few that metal arch form ripple roof structure has materials, from heavy and light, short construction period, span ability is big, and integrate advantages such as stressed, maintenance function, be subjected to vast building circle personage's concern and approval deeply.In recent years, the engineering practice of China shows that it has significant technical economic benefit and social benefit, has vast potential for future development, will become one of important development direction of lightweight steel construction.But, owing to become arch to need, being pressed with many horizontal ripplets on the circular arc frid, the existence of these ripplets causes the structure tension performance more complicated, does not form unified computation model, design formulas and analytical method at home as yet.In recent years, because design theory disunity, can not guarantee work quality, engineering accident frequently occurs, especially in the north, snow load is bigger, unstable phenomenon very easily takes place partly striding under the inhomogeneous snow load effect in this structure, in January, 1997, the snowstorm weather of Anshan Area made this area have 6 ripple arch shell structures to cave in, direct economic loss reaches 4,000,000 yuan, and after this accident that large quantities of ripples arch shells cave in because of strong wind or heavy snow all takes place in succession in hinterland such as coastal areas of southern China various places and Xinjiang.The applicant also presided over the identification and analysis of the arch contour plate roof system cave-in accident of Zhuanghe City's great achievement food (Dalian) Co., Ltd storehouse.The incident of caving in of arch contour plate roof system has caused the extensive attention of industry.Analyzing summary cave-in accident reason mainly contains: (1) profiled sheet arch cover structure is the defective sensitive structure, and the construction quality difference will cause engineering accident easily; (2) owing to have ripple to exist along arch axis, unstable failure especially partly striding under the load action, easily takes place in the stress performance more complicated, causes unsound, the disunity of various places design theory.Generally speaking, the mode of failure of profiled sheet arch cover is whole unstability, and the bearing capacity of structure is by its monolithic stability control, and the structure reliability index is on the low side, is very limited at aspects such as applied environment, use spans.

Abroad studied for many years for arch contour plate roof system, it is perfect that design theory is tending towards, and arch contour plate roof structure form is applied to little building of span or temporary building more.

In China, Liu of University Of Tianjin tin very waits the people that arch contour plate roof structure has been made number of research projects, the design and construction of instructing the profiled sheet arch cover and the establishment of relevant rules many constructive achievements have been provided, clearly proposing arch die mould plank house, to change the structure design degree of safety on the low side, should limit the suggestion of the scope of application.

In view of above situation, for a change arch contour plate roof structure uses restricted situation, avoid engineering accident as far as possible, applicant's combination is for many years to the stable research work of large-span steel, square steel pipe assembling arch truss and corresponding longitudiual truss have been proposed rationally to set up, reinforce the arch corrugated plate roof system thereby reach, improve the use span and the degree of safety of arch contour plate roof system, to change the situation of China in arch contour plate roof structure application.Summary of the invention

Purpose of the present invention: a kind of method of reinforcing metal arch form ripple roof system is provided, avoids engineering accident,, can be applicable to simultaneously use span to improve in the new building to improve the degree safe in utilization of arch form ripple roof system.

Technical scheme of the present invention is as follows:

(1) lays assembled steel pipeline overhead lifting truss in large span metal arch form ripple roof system inboard according to 6-9 rice spacing, and the fore-and-aft plane truss in 2-3 road is set at length direction.

(2) assembling arch truss sections is prefabricated, and four bolt tie points are reserved in every section assembling arch truss end, answer the prefabricated monomer of prefabricated corresponding arch truss for different spans, the high corrugated sheet roof system of mistake.

(3) arch truss end with the bearing of former ripple arch bar after treatment as the bearing that encircles truss.Longitudiual truss also is to be connected with Steel-pipe Arch Truss by the mode of reserving the connecting bolt hole, arch truss, longitudiual truss are provided with vertical square tube post at the position of joints that winds up, and the column upper end is mutually bonding with the ripple upper plate of ripple arch bar by rubber pad, adhesive material.

Effect of the present invention and benefit are by to setting up the arch truss arch corrugated plate being reinforced:

Partly stride the load bearing capacity and be greatly enhanced, also increase though stride the load bearing capacity entirely, increase rate is obviously not as partly striding the load action situation;

Because the effect of truss destroys mode variation has taken place, stress performance also is significantly improved, and has improved the stability limit bearing capacity of structure, has improved the stability of metal arch form ripple roof system;

The quality of the truss of being set up is relatively low, and the amplitude that bearing capacity improves is bigger, and economic performance is better;

Can increase substantially the safe in utilization degree of arch corrugated plate in permanent construction.

Improve roof system integral rigidity and conformal ability.

Description of drawings

Fig. 1 is corrugated sheet and arch truss combination model schematic diagram.

Fig. 2 is the arch truss and vertically links the member schematic diagram.

Fig. 3 is that the ripple arch bar of not setting up Steel-pipe Arch Truss destroys mode figure.

Fig. 4 is that the ripple arch bar of setting up Steel-pipe Arch Truss destroys mode figure.

Fig. 5 is the P-Uy curve map at maximum vertical displacement point place, and wherein P is a power, and Uy is the displacement of y direction.

Fig. 6 is the P-Ux curve map at maximum horizontal displacement point place, and wherein P is a power, and Ux is the displacement of x direction.

The specific embodiment

Below in conjunction with technical scheme and accompanying drawing, be described in detail specific embodiments of the invention.

Concrete wavy metal arch bar and arch truss and longitudiual truss position concern that schematic diagram sees Fig. 1 and Fig. 2.Arch corrugated plate adopts MIC-240 plate commonly used in the market, roof system span 36m, ratio of rise to span 0.25, thickness of slab 1mm's, the arch truss space is got 6.1m, space arch truss and fore-and-aft plane truss all adopt the pipe of ￠ 30*1.2mm, arch depth of truss in space is got 0.8m, and the assembling truss nodal pitch that winds up is 0.81m, and the lower-chord panel point spacing is 0.5m, the truss width that winds up is 500mm, and the lower edge width is 300mm.The longitudiual truss height is 0.622m, adopts plane frame.Lower-chord panel point place, the two ends hinged securement of arch truss is on the supporter of former ripple arch bar.

According to carrying out numerical simulation with upper type, result of calculation be analyzed as follows:

(1) destroys mode

The concrete destruction mode of structure is seen Fig. 3 and shown in Figure 4.

Based on theory analysis and verification experimental verification, the main mode of failure of metal arch form ripple roof structure is whole unstability before reinforcing, and this structure bearing capacity is controlled by the resistance to overturning in its plane.Pure wave line Arch Bar Structure is the antisymmetry bulk deformation partly striding under the load action, and distortion is very big.And after setting up Steel-pipe Arch Truss, the distortion of this structure obviously diminishes, and final destruction be that destruction by local arch bar causes, has avoided whole destruction.

(2) bearing capacity and deformation analysis

See Fig. 5 and Fig. 6 in order to find out the variation of setting up Steel-pipe Arch Truss front and back stability of structure energy intuitively, provide the load-displacement curve of setting up Steel-pipe Arch Truss front and back maximum vertical displacement and maximum horizontal displacement place.

(3) set up Steel-pipe Arch Truss and do not set up Steel-pipe Arch Truss ripple arch bar result of calculation contrast and see the following form

Reduced parameter	Do not set up the ripple arch bar of Steel-pipe Arch Truss	Set up the ripple arch bar of Steel-pipe Arch Truss
Reduced parameter	Do not set up the ripple arch bar of Steel-pipe Arch Truss	Set up the ripple arch bar of Steel-pipe Arch Truss	Mass area ratio (kg/m2)	12.06	16.22
Quality improves	25.6％		Mass area ratio (kg/m2)	12.06	16.22
Quality improves	25.6％		Ultimate bearing capacity (N/m2)	216.85	1832.2
Maximum vertical displacement (mm)	827	57	Ultimate bearing capacity (N/m2)	216.85	1832.2
Maximum vertical displacement (mm)	827	57	Maximum horizontal displacement (mm)	563	16
Destroy mode	The integral inverted symmetry is destroyed	Local failure	Maximum horizontal displacement (mm)	563	16

Claims

1. method that adopts the assembled steel arch truss reinforce metal arch corrugated plate roofing is characterized in that the following step poly-:

(1) lays assembled steel pipeline overhead lifting truss in large span metal arch form ripple roof system inboard according to 6-9 rice spacing, and the fore-and-aft plane truss in 2-3 road is set at length direction;

(2) assembling arch truss sections is prefabricated, and four bolt tie points are reserved in every section assembling arch truss end, answer the prefabricated monomer of prefabricated corresponding arch truss for different spans, the high corrugated sheet roof system of mistake;

(3) arch truss end with the bearing of former ripple arch bar after treatment as the bearing that encircles truss; Longitudiual truss also is to be connected with Steel-pipe Arch Truss by the mode of reserving the connecting bolt hole, arch truss, longitudiual truss are provided with vertical square tube post at the position of joints that winds up, and the column upper end is mutually bonding with the ripple upper plate of ripple arch bar by rubber pad, adhesive material.