SU748173A1 - Method of determining bend moment of beam laid on flexible support - Google Patents
Method of determining bend moment of beam laid on flexible support Download PDFInfo
- Publication number
- SU748173A1 SU748173A1 SU782593414A SU2593414A SU748173A1 SU 748173 A1 SU748173 A1 SU 748173A1 SU 782593414 A SU782593414 A SU 782593414A SU 2593414 A SU2593414 A SU 2593414A SU 748173 A1 SU748173 A1 SU 748173A1
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- SU
- USSR - Soviet Union
- Prior art keywords
- flexible support
- bending moment
- bend moment
- beam laid
- curvature
- Prior art date
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Description
1one
Изобретение относитс к механическим испытани м материалов и элементов конструкций, в частности к способам определени изгибающего момента в 5 балке, лежащей на упругом основании.The invention relates to the mechanical testing of materials and structural elements, in particular, to methods for determining the bending moment in a 5th beam lying on an elastic base.
Известен способ определени изгибающего момента в балкер лежащей на упругом основании, заключающийс в том, что нагружают балку, измер ют Ю ее кривизну по изменению прогиба вдаль длины балки и по. кривизне балки определ ют изгибающий момент 1J .There is a known method for determining the bending moment in a bulk carrier lying on an elastic base, which consists in loading the beam, measuring its curvature by the change in deflection at the distance of the beam and in length. the curvature of the beam is determined by the bending moment 1J.
Недостатком известного способа вл етс возможность его применени только при испытании балок до по влени трещин, поскольку с по влением в балке трещин измен етс ее изгибна жесткость.The disadvantage of this method is that it can only be used when testing beams before the appearance of cracks, because with the appearance of cracks in a beam, its flexural rigidity changes.
Цель изобретени - расширение BO3-2Q можностей определени изгибающего момента .The purpose of the invention is to expand the BO3-2Q ability to determine the bending moment.
Это достигаетс тем, что предварительно провод т нагружение такой же балки статически определимой систе- 25 мой сил и регистрируют зависимость изгибающего момента от кривизны балки , а изгибающий момент в балке, лежащей на упругом основании, определ ют по этой зависимости.JQThis is achieved by preloading the same beam with a statically determinable system of forces and recording the dependence of the bending moment on the curvature of the beam, and the bending moment in the beam lying on the elastic foundation is determined by this dependence.
Это позвол ет учесть изменение изгибной жесткости балки за счет образовани трещин в процессе испытани .This allows for a change in the bending stiffness of the beam due to the formation of cracks during the test.
На фиг. 1 приведена схема испытани балки по статически определимой схеме на фиг. 2 - график устанавливаемой при этом испытании зависимости; на фиг. 3 - схема испытани балки на упругом основании.FIG. 1 is a diagram of testing a beam in a statically determinable pattern in FIG. 2 is a graph of dependence established during this test; in fig. 3 is a scheme for testing a beam on an elastic base.
Способ осуществл етс следующим образом.The method is carried out as follows.
Балку 1 устанавливают на испытательный стен.р, нагружают ее статически определимой системой сил Р, и прибором 2 регистрируют изменение ее кривизны по изменению прогиба вдоль длины балки в процессе испытани .Beam 1 is installed on the test wall., It is loaded with a statically determined system of forces P, and device 2 records the change in its curvature by the change in deflection along the length of the beam during the test.
Изгибающий момент определ ют при этом на основании расчета статически определимой балки и стро т зависимость изгибающего момента от кривизны балки. Зависимость эта имеет нели нейный характер, поскольку жесткость балки в процессе испытани измен етс вследствие образовани трещинThe bending moment is determined on the basis of the calculation of a statically determinable beam and the dependence of the bending moment on the curvature of the beam is plotted. This dependence is non-linear, since the stiffness of the beam changes during the test due to the formation of cracks.
Затем испытывают точно такую же балку, лежащую на упругом.основании. Дл этого балку устанавливают наThen test exactly the same beam, which lies on an elastic base. For this, the beam is set to
стенд с упругим основанием 3, На балку устанавливают прибор 2 дл измерени кривизны балки, производ т поэтапное нагружение балки, измер ют кривизну балки по изменению прогиба вдоль длины балки и по зависимости приведенной на фиг. 2, определ ют изгибающий момент в балке при измеренной кривизне.stand with elastic base 3; An instrument 2 for measuring the curvature of the beam is installed on the beam; the beam is gradually loaded; 2, the bending moment in the beam is determined at the measured curvature.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU782593414A SU748173A1 (en) | 1978-03-22 | 1978-03-22 | Method of determining bend moment of beam laid on flexible support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU782593414A SU748173A1 (en) | 1978-03-22 | 1978-03-22 | Method of determining bend moment of beam laid on flexible support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU748173A1 true SU748173A1 (en) | 1980-07-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU782593414A SU748173A1 (en) | 1978-03-22 | 1978-03-22 | Method of determining bend moment of beam laid on flexible support |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU748173A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4735093A (en) * | 1985-08-27 | 1988-04-05 | Commonwealth Of Australia | Apparatus for applying a load to a material |
| CN102914473A (en) * | 2012-09-27 | 2013-02-06 | 大连民族学院 | Method for recognizing cross-section bending moment and curvature relation of reinforced concrete beam |
-
1978
- 1978-03-22 SU SU782593414A patent/SU748173A1/en active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4735093A (en) * | 1985-08-27 | 1988-04-05 | Commonwealth Of Australia | Apparatus for applying a load to a material |
| CN102914473A (en) * | 2012-09-27 | 2013-02-06 | 大连民族学院 | Method for recognizing cross-section bending moment and curvature relation of reinforced concrete beam |
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