A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Medinių daugiasluoksnių armuotų sijų standumo tyrimai veikiant trumpalaikėms ir ilgalaikėms skersinėms jėgoms
Investigations into the deflection of reinforced multi-layer prestressed timber beams under short- and long-time shear The article continues a series of papers dealing with the investigations into the strength of multi-layer beams under the action of shear [1, 2]. The results of research on the stiffness of timber reinforced beams are presented. As a result of experiments the authorial certificates of five inventions were obtained. One of them is the certificate of the invention SU 1091047 A, G 01 M5/00 “The equipment of experiment of building constructions” [3]; it is also described in the paper. The objective of the experiments was to check the new method of increasing load-bearing capacity of timber multi-layer beams: prestress of separate wooden layers across the axis of the element, described in the above-mentioned papers [1, 2]. The results of investigations in stiffness of 28 timber reinforced beams of different cross-section and the way of manufacture under the action of shear are given in the paper. Sixteen beams were tested by static short-time loading and the rest twelve by static long-time loading. All beams failed because of shear. It was determined that deflections of timber reinforced beams under short-time design loads independently on the constructions are much larger (in average 1.48–1.88 times) than those calculated according to the running standards. Because of insufficient evaluation of the shear influence on the deflections the author offers to make it more precise with the help of coefficient kcin the formula (1): for timber reinforced beams without prestressingkc= 2.75, for multi-layer beams with prestressingkc= 1.75. Deflections of timber reinforced beams, of multi-layer beams with prestressing among them at the time of failure under short-time loading are in average 4.75–5.08 times and under long-time loading – 5.59–6.75 times bigger than those calculated according to the codes of practice for the same beams under design loads. Deflections at the time of timber reinforced beams, that ...
Medinių daugiasluoksnių armuotų sijų standumo tyrimai veikiant trumpalaikėms ir ilgalaikėms skersinėms jėgoms
Investigations into the deflection of reinforced multi-layer prestressed timber beams under short- and long-time shear The article continues a series of papers dealing with the investigations into the strength of multi-layer beams under the action of shear [1, 2]. The results of research on the stiffness of timber reinforced beams are presented. As a result of experiments the authorial certificates of five inventions were obtained. One of them is the certificate of the invention SU 1091047 A, G 01 M5/00 “The equipment of experiment of building constructions” [3]; it is also described in the paper. The objective of the experiments was to check the new method of increasing load-bearing capacity of timber multi-layer beams: prestress of separate wooden layers across the axis of the element, described in the above-mentioned papers [1, 2]. The results of investigations in stiffness of 28 timber reinforced beams of different cross-section and the way of manufacture under the action of shear are given in the paper. Sixteen beams were tested by static short-time loading and the rest twelve by static long-time loading. All beams failed because of shear. It was determined that deflections of timber reinforced beams under short-time design loads independently on the constructions are much larger (in average 1.48–1.88 times) than those calculated according to the running standards. Because of insufficient evaluation of the shear influence on the deflections the author offers to make it more precise with the help of coefficient kcin the formula (1): for timber reinforced beams without prestressingkc= 2.75, for multi-layer beams with prestressingkc= 1.75. Deflections of timber reinforced beams, of multi-layer beams with prestressing among them at the time of failure under short-time loading are in average 4.75–5.08 times and under long-time loading – 5.59–6.75 times bigger than those calculated according to the codes of practice for the same beams under design loads. Deflections at the time of timber reinforced beams, that ...
Medinių daugiasluoksnių armuotų sijų standumo tyrimai veikiant trumpalaikėms ir ilgalaikėms skersinėms jėgoms
Čechavičius, Rimantas (author)
1998-12-31
doi:10.3846/13921525.1998.10531416
Journal of Civil Engineering and Management; Vol 4 No 4 (1998); 266-273 ; 1822-3605 ; 1392-3730
Article (Journal)
Electronic Resource
English
DDC:
690