CN107478677A - Spring, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system - Google Patents
Spring, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system Download PDFInfo
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- CN107478677A CN107478677A CN201710499924.4A CN201710499924A CN107478677A CN 107478677 A CN107478677 A CN 107478677A CN 201710499924 A CN201710499924 A CN 201710499924A CN 107478677 A CN107478677 A CN 107478677A
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Abstract
A kind of spring, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system, including boundary constraint device, reaction frame, load, control and data acquisition device and experiment furnace apparatus, armored concrete breadboard is placed on experiment furnace apparatus, load is placed on armored concrete experiment floor, reaction frame is arranged in experiment furnace apparatus surrounding, boundary constraint device is located between reaction frame and armored concrete experiment floor, control and boundary constraint device is controlled with experiment furnace apparatus respectively for data acquisition device and data acquisition, it is respectively spring boundary constraint device and damper boundary constraint device that the boundary constraint device, which has two schemes,；The present invention can further investigate armoured concrete slab fire-resistance behavior and different boundary constraints effect to the affecting laws of armoured concrete slab fire resistance, and experimental technique is constrained with actual building structural element and is more consistent.
Description
Technical field
The present invention relates to a kind of reinforced concrete floor Fire-resistance test system, is specifically that one kind is entered using spring, damper
The reinforced concrete floor Fire-resistance test system of row bound constraint, so as to obtain different boundary effect of contraction to reinforced concrete Tulou
The affecting laws of plate fire resistance, belong to building structure and prevent and reduce natural disasters technical field.
Background technology
In recent years, China is in rapid economic development period, and annual billions of square metres building is constantly built up, wherein
Armoured concrete slab is most important Horizontal load-bearing component, the quilt in tier building, skyscraper and novel fabricated building
It is commonly used.
In fire, reinforced concrete floor directly bears S.I biogas engine, and because thickness of slab is smaller, cover to reinforcement is relatively thin, causes
Reinforced concrete floor is that fire area is maximum, one of component of damage most serious during fire, be in total fire-resistance more
Weak link.
In order to assess the fire resistance of concrete slab, it is desirable under the conditions of as defined in specification (including heating, pressure, loading
And by conditions such as fire), detected using standard fire test.
Currently, the Fire-resistance test of most of armoured concrete slabs only considers single boundary constraint, and concrete slab may only
The a certain degree of Free Transform of generation.And in a practical situation, Concrete At High Temperature floor is because its deformation is by adjacent floor deck
Constraint can show and the visibly different characteristic of independent floor member.
However, it is necessary to an individually designed boundary constraint of plate when existing concrete plate pilot system applies boundary constraint
Testing program, when boundary condition is complicated or needs to carry out boundary constraint to multiple plates, generally require during long run test
Trial furnace is disassembled, again reforming test furnace structure, so not only result in the waste of time and resource, to some complicated borders
Condition is also difficult to simulate.Therefore, a kind of fire test system for adapting to more arbitrary boundary conditions is studied to have important practical significance.
The content of the invention
In order to overcome the above-mentioned deficiency of prior art, the present invention provides a kind of spring, damper boundary constraint multiple constraint steel
Reinforced concrete plate Fire-resistance test system, fire-resistance behavior and the different boundary constraints effect of armoured concrete slab can be furtherd investigate
To the affecting laws of armoured concrete slab fire resistance, and experimental technique is more consistent with the constraint of actual building structural element.
The present invention solves the technical scheme that its technical problem uses：Including boundary constraint device, reaction frame, load,
Control and data acquisition device and experiment furnace apparatus, armored concrete breadboard are placed on experiment furnace apparatus, and load is placed
On armored concrete experiment floor, reaction frame is arranged in experiment furnace apparatus surrounding, and boundary constraint device is located at reaction frame and steel
Between reinforced concrete experiment floor, control and data acquisition device are controlled to boundary constraint device and experiment furnace apparatus respectively
And data acquisition, it is respectively spring boundary constraint device and damper boundary constraint dress that the boundary constraint device, which has two schemes,
Put；The spring boundary constraint device includes actuator devices, hinged-support, spring and laser range sensor；Actuator devices
Including actuator, electrohydraulic servo valve I and push up flow divider more, actuator one end is fixed on the reaction beam of reaction frame, the other end with
Spring end plate connection, another end plate of spring are fixed on hinged-support, and it is remote that laser range sensor is fixed on spring center
On the spring end plate of armored concrete breadboard side, hinged-support is arranged symmetrically in two above and below armored concrete breadboard restained beam
Side, spacing is closed with the matching size of armored concrete breadboard and restained beam between upper and lower hinged-support；Single spring boundary constraint
Device has two springs, two actuator devices and two hinged-supports, and the effect of actuator devices makes spring produce necessarily
Displacement；Multiple spring boundary constraint devices are distributed on edges of boards surrounding, the start of multiple spring boundary constraint devices by appropriate spacing
In parallel between device device, the electrohydraulic servo valve I in actuator devices in parallel is connected with more top flow dividers, two spring borders
The matching size of the distance between restraint device and armored concrete breadboard closes；The damper boundary constraint device includes liquid
Pressure damper and tachogenerator, one end of hydraulic damper are connected on hinged-support by oscillating bearing, and its other end passes through
It is bolted on reaction beam, tachogenerator is fixed on oscillating bearing one end of hydraulic damper.
Compared with prior art, spring of the invention, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system
System, spring boundary constraint device or damper boundary constraint device is set to pass through spring or hydraulic pressure as boundary constraint device
Damper provides boundary constraint power, improves existing reinforced concrete floor fire test technology and actual building structural element about
The shortcomings that beam is inconsistent, and then fire-resistance behavior and the different boundary constraints effect pair of armoured concrete slab can be furtherd investigate
The affecting laws of armoured concrete slab fire resistance；Specifically, there is the multiple constraint armored concrete of spring boundary constraint device
Plate Fire-resistance test system, can be by measuring restraining force and rotational restraint power in spring deformation amount calculating face, and has damper
The multiple constraint armoured concrete slab Fire-resistance test system of boundary constraint device, can be by measuring damper termination translational speed meter
Restraining force and rotational restraint power in calculation face.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is vertical view cutaway drawing of the present invention；
The A-A that Fig. 2 is Fig. 1 when using spring boundary constraint device is to sectional view；
Fig. 3 is the section view of the spring boundary constraint device of the present invention；
Fig. 4 is the top view of the spring boundary constraint device of the present invention；
Fig. 5 is the steel ball of the present invention and the layout drawing of firm roller bearing；
Fig. 6 is that the short side of armored concrete breadboard has boundary constraint device during spring boundary constraint to arrange schematic diagram；
Fig. 7 is that the long side of armored concrete breadboard has boundary constraint device during spring boundary constraint to arrange schematic diagram；
Fig. 8 is that four sides of armored concrete breadboard have boundary constraint device during spring boundary constraint to arrange schematic diagram；
Fig. 9 is spring boundary constraint camber of spring figure；
Figure 10 is spring boundary constraint force analysis figure；
The A-A that Figure 11 is Fig. 1 when using damper boundary constraint is to sectional view；
Figure 12 is the section view of damper boundary constraint device；
Figure 13 is that four sides of armored concrete breadboard have boundary constraint device arrangement during Damping Boundary restraint device to show
It is intended to；
Figure 14 is damper boundary constraint damper deformation pattern；
In figure：1st, boundary constraint device, 1.1, actuator, 1.2, push up flow divider, 1.3, hinged-support, 1.4, spring more,
1.5th, laser range sensor, 1.6, hydraulic damper, 1.7, tachogenerator, 2, reaction frame, 2.1, reaction beam, 2.2, counter-force
Post, 3, load, 4, control and data acquisition device, 5, experiment furnace apparatus, 5.1, body of heater, 5.2, drop-bottom, 5.3, steel ball,
5.4th, steel roller bearing, 5.5, integral combustor, 5.6, furnace temperature thermocouple, 5.7, support beam, 5.8, support column, 5.9, smoke evacuation it is logical
Road, 5.10, water circulating pipe, 6, armored concrete breadboard, 7, flexible refractory material, 8, fuel tank and fuel delivery mechanism,
9th, water pump, d1、d2The deflection of respectively two springs, c are hinged-support and the symmetrical distance between axles of restained beam.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to protection scope of the present invention.
In Fig. 1, a kind of spring, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system, including side
Boundary treaty bundle device 1, reaction frame 2, load 3, control and data acquisition device 4 and experiment furnace apparatus 5, reaction frame 2 is by vertical
The reaction beam 2.1 for standing in the counter-force post 2.2 on ground and being connected laterally between counter-force post 2.2 connects and composes framework, reinforced concrete
Native breadboard 6 is placed on experiment furnace apparatus 5, and load 3 is placed on armored concrete experiment floor, and reaction frame 2 is arranged in
The surrounding of furnace apparatus 5 is tested, boundary constraint device 1 is located between reaction frame 2 and armored concrete experiment floor, and control and data are adopted
Boundary constraint device 1 is controlled with experiment furnace apparatus 5 respectively for acquisition means 4 and data acquisition, wherein the boundary constraint fills
It is spring boundary constraint device or damper boundary constraint device to put 1.Two-stage acting device is provided with boundary constraint device
(i.e. in forming face the structure of constraint and form the structure of rotational restraint), it is possible to achieve the difference of constraint and rotational restraint face in,
It is adjusted in synchronism.
Fig. 2 to Figure 10 shows the embodiment when the boundary constraint device 1 of the present invention is spring boundary constraint device, institute
Stating spring boundary constraint device includes actuator devices, hinged-support 1.3, spring 1.4 and laser range sensor 1.5；Actuator
Device includes actuator 1.1, electrohydraulic servo valve I and more top flow dividers 1.2, and the one end of actuator 1.1 is fixed on the counter-force of reaction frame 2
On beam 2.1, the other end and spring end plate connection, another spring end plate of spring 1.4 are fixed on hinged-support 1.3, Laser Measuring
It is fixed on away from sensor 1.5 on spring end plate of the center of spring 1.4 away from the side of armored concrete breadboard 6, hinged-support 1.3 is right
Title is arranged in the restained beam of armored concrete breadboard 6 both sides up and down, and upper and lower 1.3 spacing of hinged-support are tested with armored concrete
The matching size of plate 6 and restained beam closes；Single spring boundary constraint device have two springs, 1.4, two actuator devices and
Two hinged-supports 1.3, the effect of actuator devices make spring 1.4 produce certain displacement；Multiple spring boundary constraint devices are pressed
Appropriate spacing is distributed on edges of boards surrounding, actuator in parallel, in parallel between the actuator devices of multiple spring boundary constraint devices
Electrohydraulic servo valve I in device is connected with more top flow dividers 1.2, and the flow dividers 1.2 that push up control in several actuator devices more
Chi of the distance between the same amount work, two spring boundary constraint devices simultaneously of electrohydraulic servo valve I with armored concrete breadboard 6
It is very little to be engaged.
Referring to Fig. 9 and Figure 10, this spring boundary constraint multiple constraint armoured concrete slab Fire-resistance test system can pass through survey
Measure restraining force and rotational restraint power in spring deformation amount calculating face：The rigidity of two springs 1.4 is respectively k1And k2, spring 1.4
Former a length of d0, then N=k is constrained in face1×(d1-d0)+k2×(d2-d0)；Rotational restraint is M=N2×a-N1× a, wherein N1
=k1×(d1-d0),N2=k2×(d2-d0)。
Figure 11 to Figure 14 gives the implementation when the boundary constraint device 1 of the present invention is damper boundary constraint device
Example, the damper boundary constraint device include hydraulic damper 1.6 and tachogenerator 1.7, one end of hydraulic damper 1.6
It is connected to by oscillating bearing on hinged-support 1.3, its other end is bolted on reaction beam 2.1, tachogenerator 1.7
It is fixed on oscillating bearing one end of hydraulic damper 1.6.Specifically, it is pre-buried on the restained beam of the armored concrete breadboard 6
Connector, hinged-support 1.3 are connected by bolt with built-in fitting；Prepared screw-bolt hole on reaction beam 2.1, the one end of actuator 1.1 pass through
It is bolted on the reaction beam 2.1 of reaction frame 2；The other end of actuator 1.1 passes through bolt and spring end plate connection.
Referring to Figure 12 and Figure 14, this damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system can pass through
Measure restraining force and rotational restraint power in the translational speed calculating face of damper termination：Two damper dampings are respectively c1、c2, certain
Moment speed is respectively v1、v2, then N=c is constrained in face1v1+c2v2；Rotational restraint is M=c1v1a-c2v2a。
Referring to Fig. 2 and Figure 11, in the above-described embodiments, the experiment furnace apparatus 5 includes body of heater 5.1, drop-bottom 5.2, one
Body formula burner 5.5, furnace temperature thermocouple 5.6, support beam 5.7, support column 5.8, discharge flue 5.9 and water circulating pipe 5.10；
Body of heater 5.1 includes assembled furnace wall and connector, is connected between assembled furnace wall by connector；Flame-observing hole is set on body of heater 5.1；Stove
Burner mounting hole is provided with body 5.1；Drop-bottom 5.2 is fixedly connected on bottom of furnace body, is provided with exhaust opening above；Integral type is fired
The spout of burner 5.5 is set towards the inside of body of heater 5.1, and the burner mounting hole through on body of heater 5.1 is arranged on oil supply pipe
Above and with oil supply pipe connect；Oil supply pipe is arranged circumferentially at outside body of heater 5.1, oil supply pipe and fuel tank and fuel delivery
Mechanism 8 connects；The junction installation of integral combustor 5.5 and oil supply pipe is connected with electrohydraulic servo valve II and igniter, electricity
Hydraulic servo II exports corresponding fuel oil after receiving the electric signal sent by central processing unit；Furnace temperature thermocouple 5.6 is arranged on stove
The upper inside wall of body 5.1；Discharge flue 5.9 connects with the exhaust opening of drop-bottom 5.2；Water circulating pipe 5.10 is wrapped in discharge flue
Outside 5.9, and it is connected by electrohydraulic servo valve III with water pump 9；Support column 5.8 is distributed in four corners in the outside of body of heater 5.1, support
Beam 5.7 is shelved on support column 5.8 along the top edge of body of heater 5.1, and support beam 5.7 is bolted with support column 5.8, and reinforcing bar mixes
Native breadboard 6 is coagulated to be placed in support beam 5.7.
Further improving is, steel ball 5.3 is set between top surface and armored concrete the experiment floor of the body of heater 5.1
With steel roller bearing 5.4, the space between steel ball 5.3 and steel roller bearing 5.4 is filled with flexible refractory material 7；Support beam 5.7 and support column
5.8 are protected by refractory material.
Preferably, described flexible refractory material 7 selects refractory fiber cotton；Described steel ball 5.3 and the diameter of steel roller bearing 5.4
It is sized to 80-100mm；Spacing between described steel ball 5.3 takes 3-5 times of armored concrete experiment floor thickness of slab.
Described control and data acquisition device 4 include central processing unit, flame control loop, temperature acquisition loop, position
Move acquisition circuit, strain acquirement loop, its length acquisition circuit, actuator control loop and Control for Kiln Temperature loop；Centre
Reason device electrically connects with the electrohydraulic servo valve II on integral combustor 5.5 and igniter；Central processing unit and data collecting instrument electricity
Connection, data collecting instrument electrically connect with furnace temperature thermocouple 5.6, and data collecting instrument is with being arranged on armored concrete laboratory building intralamellar part
Measurement concrete and reinforcing bar temperature thermocouple electrical connection；Data collecting instrument is with being arranged on armored concrete experiment floor level
On measurement the inside and outside displacement in floor level displacement transducer electrical connection；Data collecting instrument is with being arranged on armored concrete experiment
The foil gauge electrical connection of measurement reinforcing bar strain inside floor；Data collecting instrument is with setting the laser ranging on spring 1.4 to sense
Device 1.5 electrically connects；Data collecting instrument electrically connects with tachogenerator 1.7；Central processing unit and more tops point in actuator devices
Stream valve 1.2 electrically connects, and electrohydraulic servo valve I exports corresponding flow and pressure after receiving the electric signal sent by pushing up flow divider 1.2 more
Power controls actuator 1.1；Central processing unit electrically connects with the damping control valve in hydraulic damper 1.6；Central processing unit and shape
Electrically connected into the electrohydraulic servo valve III on the water circulating pipe 5.10 in Control for Kiln Temperature loop, electrohydraulic servo valve III is received by centre
Corresponding water is exported after the electric signal that reason device is sent.In-furnace temperature uses thermocouple measurement, can be to stove by Control for Kiln Temperature loop
Interior temperature is monitored in real time, and can be adjusted at any time so that in-furnace temperature can meet ISO834 international standard liters well
Warm curve or the heating curve of other settings；Due to provided with temperature acquisition loop, displacement acquisition loop and strain acquirement loop, because
This can measure the parameters such as the temperature of breadboard inner concrete and reinforcing bar, the inside and outside displacement of plate plane and reinforcing bar strain simultaneously；Start
Device 1.1 is controlled by electrohydraulic servo valve I, be can adjust loading velocity, is realized changeability of the boundary constraint with the time, and then can be more
The good actual armoured concrete slab of simulation is by condition of a fire condition.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to
According to the technical spirit of the present invention, any simple modification and equal change are made to above example, each falls within the guarantor of the present invention
Within the scope of shield.
Claims (6)
1. a kind of spring, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system, including boundary constraint device
(1), reaction frame (2), load (3), control and data acquisition device (4) and experiment furnace apparatus (5), armored concrete breadboard
(6) it is placed on experiment furnace apparatus (5), load (3) is placed on armored concrete experiment floor, and reaction frame (2) is arranged in
Test furnace apparatus (5) surrounding, boundary constraint device (1) is located between reaction frame (2) and armored concrete experiment floor, control and
Data acquisition device (4) is controlled and data acquisition to boundary constraint device (1) and experiment furnace apparatus (5) respectively, its feature
It is：
The boundary constraint device (1) is spring boundary constraint device or damper boundary constraint device；
The spring boundary constraint device includes actuator devices, hinged-support (1.3), spring (1.4) and laser range sensor
(1.5)；Actuator devices include actuator (1.1), electrohydraulic servo valve I and push up flow divider (1.2), actuator (1.1) one end more
It is fixed on the reaction beam (2.1) of reaction frame (2), the other end and spring end plate connection, another spring end plate of spring (1.4)
It is fixed on hinged-support (1.3), laser range sensor (1.5) is fixed on spring (1.4) center and tested away from armored concrete
On the spring end plate of plate (6) side, hinged-support (1.3) is arranged symmetrically in armored concrete breadboard (6) restained beam both sides up and down,
Spacing is closed with the matching size of armored concrete breadboard (6) and restained beam between upper and lower hinged-support (1.3)；Single spring border
There is restraint device two springs (1.4), two actuator devices and two hinged-supports (1.3), the effect of actuator devices to make
Spring (1.4) produces certain displacement；Multiple spring boundary constraint devices are distributed on edges of boards surrounding, multiple springs by appropriate spacing
It is in parallel between the actuator devices of boundary constraint device, electrohydraulic servo valve I and more top flow dividers in actuator devices in parallel
(1.2) it is connected, the matching size of the distance between two spring boundary constraint devices and armored concrete breadboard (6) closes；
The damper boundary constraint device includes hydraulic damper (1.6) and tachogenerator (1.7), hydraulic damper
(1.6) one end is connected on hinged-support (1.3) by oscillating bearing, and its other end is bolted on reaction beam (2.1)
On, tachogenerator (1.7) is fixed on oscillating bearing one end of hydraulic damper (1.6).
2. spring according to claim 1, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system, its
It is characterized in：Built-in connection on the restained beam of the armored concrete breadboard (6), hinged-support (1.3) by bolt with it is pre-buried
Part connects；Prepared screw-bolt hole on reaction beam (2.1), actuator (1.1) one end are bolted on the reaction beam of reaction frame (2)
(2.1) on；Actuator (1.1) other end passes through bolt and spring end plate connection.
3. spring according to claim 1 or 2, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system
System, it is characterized in that：The experiment furnace apparatus (5) includes body of heater (5.1), drop-bottom (5.2), integral combustor (5.5), furnace temperature
Thermocouple (5.6), support beam (5.7), support column (5.8), discharge flue (5.9) and water circulating pipe (5.10)；Body of heater (5.1)
Including assembled furnace wall and connector, connected between assembled furnace wall by connector；Body of heater sets flame-observing hole on (5.1)；Body of heater
(5.1) burner mounting hole is provided with；Drop-bottom (5.2) is fixedly connected on the bottom of body of heater (5.1), is provided with smoke evacuation above
Mouthful；The spout of integral combustor (5.5) is installed towards setting inside body of heater (5.1), and through the burner on body of heater (5.1)
Hole is arranged on oil supply pipe and connected with oil supply pipe；Oil supply pipe is arranged circumferentially at body of heater (5.1) outside, oil supply pipe
Connected with fuel tank and fuel delivery mechanism (8)；The junction installation of integral combustor (5.5) and oil supply pipe is connected with electricity
Hydraulic servo II and igniter；Furnace temperature thermocouple (5.6) is arranged on the upper inside wall of body of heater (5.1)；Discharge flue (5.9) and stove
The exhaust opening connection of bottom plate (5.2)；Water circulating pipe (5.10) is wrapped in discharge flue (5.9) outside, and passes through electro-hydraulic servo
Valve III is connected with water pump (9)；Support column (5.8) is distributed in outside four corners of body of heater (5.1), and support beam (5.7) is along body of heater
(5.1) top edge is shelved on support column (5.8), and support beam (5.7) is bolted with support column (5.8), reinforced concrete
Native breadboard (6) is placed in support beam (5.7).
4. spring according to claim 3, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system, its
It is characterized in：Steel ball (5.3) and steel roller bearing are set between top surface and armored concrete the experiment floor of the body of heater (5.1)
(5.4), the space between steel ball (5.3) and steel roller bearing (5.4) is filled with flexible refractory material (7)；Support beam (5.7) and support
Post (5.8) is protected by refractory material.
5. spring according to claim 4, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system, its
It is characterized in：Described flexible refractory material (7) selects refractory fiber cotton；Described steel ball (5.3) and steel roller bearing (5.4) diameter chi
It is very little to be arranged to 80-100mm；Spacing between described steel ball (5.3) takes 3-5 times of armored concrete experiment floor thickness of slab.
6. spring according to claim 3, damper boundary constraint multiple constraint armoured concrete slab Fire-resistance test system, its
It is characterized in：Described control and data acquisition device (4) include central processing unit, flame control loop, temperature acquisition loop, position
Move acquisition circuit, strain acquirement loop, its length acquisition circuit, actuator control loop and Control for Kiln Temperature loop；Centre
Reason device electrically connects with the electrohydraulic servo valve II on integral combustor (5.5) and igniter；Central processing unit and data collecting instrument
Electrical connection, data collecting instrument electrically connect with furnace temperature thermocouple (5.6), and data collecting instrument is with being arranged on armored concrete experiment floor
The thermocouple electrical connection of internal measurement concrete and reinforcing bar temperature；Data collecting instrument is with being arranged on armored concrete experiment floor
The displacement transducer electrical connection of the measurement inside and outside displacement in floor level in plane；Data collecting instrument is with being arranged on armored concrete
The foil gauge electrical connection of the measurement reinforcing bar strain of laboratory building intralamellar part；Data collecting instrument is with setting the Laser Measuring on spring (1.4)
Electrically connected away from sensor (1.5)；Data collecting instrument electrically connects with tachogenerator (1.7)；Central processing unit and actuator devices
In more top flow dividers (1.2) electrical connection；Central processing unit electrically connects with the damping control valve in hydraulic damper (1.6)；In
Electrohydraulic servo valve III on water circulating pipe (5.10) of the central processor with forming Control for Kiln Temperature loop electrically connects.
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| CN110542703A (en) * | 2019-10-14 | 2019-12-06 | 哈尔滨工业大学 | Device and method for monitoring thermal expansion stress and deformation of foam concrete in constraint state |
| CN110608907A (en) * | 2019-09-18 | 2019-12-24 | 广州大学 | Support for providing in-plane or out-of-plane elastic torsion restraint and experimental device comprising same |
| CN111189695A (en) * | 2020-02-17 | 2020-05-22 | 华侨大学 | Plate structure fixed end boundary restraint device |
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