How many buses can I take to the central campus of Shandong Univ
Hello, No.1 bus, direct fare 1 yuan
bus line: No.1, the whole journey is about 7.8km
1, walk about 810m from Jinan Station to jingerwei station
2, take No.1 bus, pass 10 stops, reach Shanda South Road Station
3, walk about 450m to the South Gate of central campus of Shandong University
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In the design of building structure, the calculation of ordinary residential floor is usually considered according to the load of 2.0kn/m2, but the load calculation method is involved here. You can simply understand it as 200kg per square meter. The standard of houses built before 2000 should be lower, which can be 150kg per square meter
What needs to be clear is:1. What is the initial function of this building
Whether there are planning proceres and formal design3. Construction year and quality
after a clear understanding, we will feel more at ease
extended data:
floor maintenance
1. The concrete strength with a span of more than 8m is ≥ 100%, and the formwork can be removed only when the concrete strength is greater than or equal to 75% for 8m or less; When the concrete strength is greater than or equal to 1.2MPa, the floor can be accessed and constructed Generally, the strength can reach ≥ 1.2MPa 24 hours after irrigation, and 7-9 days under normal maintenance in spring, summer and autumn; The formwork can be removed in 10-15 days under normal maintenance in winter)
2. Under the condition of normal maintenance, it should not be less than twice a day; Make sure there is 11-16 minutes of water on the floor every time
The moisture conservation of concrete is very important for its strength growth and various performance improvement, especially the early proper maintenance can avoid surface dehydration and greatly rece the initial expansion cracks of concrete Therefore, the necessary maintenance (generally more than 24 hours) of the floor concrete after pouring must be guaranteed. For example, in the actual construction, e to rushing the construction period and watering will affect the snapping line and the operation of the construction personnel, the construction must adhere to covering sacks or straw bags for a week or so of proper moisture conservation5. When the floor strength reaches 75%, the formwork can be removed
(1), load calculation
standard value of dead load
20 mm thick cement mortar surface: 0.02 × 20 = 0.4 kn / m2
80mm thick reinforced concrete slab: 0.08 × 25 = 2.0 kn / m2
15mm thick mixed mortar ceiling plastering: 0.015 × 17 = 0.255 kn / m2
subtotal 2.655 kn / m2
standard value of live load: 10.0 kn / m2
because it is an instrial building floor and the standard value of live load is greater than, the partial factor of live load is taken as,
design value of dead load: g = 2.655 × 1.2 = 3.168 kn / m2
design value of live load: q = 10 × 1.3 = 13.0kn / m2
total load design value: G + q = 16.186kn / m2, approximately 16.2kn / m2
(2) the calculation diagram
takes 1m slab width as the calculation unit, and the actual structure of the slab is shown in the figure. It can be seen from the figure that the section width of the secondary beam is b = 200mm, and the supporting length of the cast-in-place slab on the wall is a =, so it is designed according to the redistribution of plastic internal force, The calculation span of slab is:
the side span is determined according to the smaller value of the following two terms:
L01 = ln + H / 2 = (2000-120-200 / 2) + 80 / 2 = 1820 mm
l011 = ln + A / 2 = (2000-120-200 / 2) + 120 / 2 = 1840 mm
so the calculation span of side span slab is LO1 = 1820 mm
middle span: L02 = ln = 2000-200 = 1800 mm
the calculation diagram of slab is shown in the figure
(3) design value of bending moment
e to the difference of calculated span between side span and middle span (1820-1800) / 1800 = 1.1% less than 10%, it can be calculated as equal span continuous slab
according to the data, the bending moment coefficient of slab can be obtained α M. The calculation process of bending moment design value of slab is shown in the following table
calculation of bending moment design value of slab
section position 1
side span and middle span B
off end second support 2
mid span C
middle bearing
moment coefficient 1 / 11 - 1/11 1/16 - 1 / 14
calculation span l0 (m) l01=1.82 l01=1.82 l02=1.80 l02=1.80
(kN.m) sixteen point two × one point eight two × 1.82/11=4.88 - sixteen point two × one point eight two × 1.82/11=-4.88 sixteen point two × one point eight zero × 1.80/16=3.28 - sixteen point two × one point eight zero × 1.80/14 = - 3.75
(4) reinforcement calculation - Calculation of flexural capacity of normal section
plate thickness 80mm, Ho = 80-20 = 60mm, B = 1000mm, C25 concrete A1 = 1.0, FC = 11.9n/mm2, hpb235 reinforcement, FY = 210 n / mm2. Considering the arching effect, the bending moment design value of 2 section in the span and C section of the support can be reced by 20% for the slab belt between axis ② and ⑤. For convenience, the reinforcement area can be reced by 20%. The calculation process of slab reinforcement is shown in the table
calculation of slab reinforcement
section position one B two C
design value of bending moment () four point eight eight - four point eight eight three point two eight - 3.75
α s=M/ α 1fcbh02 zero point one one four - zero point one one four zero point zero seven seven - 0.088
0.121 0.1<- 0.121< zero point three five zero point zero eight 0.1<- 0.092< 35
axis
① ~ ② ⑤ ~ ⑥ Calculated reinforcement (mm2)
as= ξ bh0 α 1fc/fy four hundred and eleven - four hundred and eleven two hundred and seventy-two 313
actual reinforcement (mm2) 10@190 10@190 8@180 8@160
As=413 As=413 As=279 As = 314
axis 2 ~ 5 Calculated reinforcement (mm2)
as= ξ bh0 α 1fc/fy four hundred and eleven four hundred and eleven zero point eight × 272=218 0.8 × 313 = 250
actual reinforcement (mm2) 10@190 10@190 8@180 8@180
As=413 As=413 As=279 As = 279
Pmin = 0.45ft/fy = 0.45 × 1.27/210=0.27%
P=As/bh =0.52% P=As/bh =0.52% P=As/bh =0.47% P = as / BH = 0.47%
(5) drawing of reinforcement diagram of slab
in addition to calculation reinforcement, structural reinforcement, such as distribution reinforcement and additional reinforcement of slab embedded in wall, should be provided in slab.
In the design of building structure, the calculation of ordinary residential floor is usually considered according to the load of 2.0kn/m2, but the load calculation method is involved here. You can simply understand it as 200kg per square meter< br />